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Location:
melbourne, australia
Registered:
June 2002
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varying rough idle on 96 camry
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Mon, 18 October 2004 03:16
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hey guys
recently over the last few months i have noticed that my car varies revs at idle.
car in question is a 96 v6 camry
when slowing down to a stop the car will drop revs to about 600rpm and start to idle rough then jump back up to idle at around 800rpm. it idles jsut a tad rougher now.
it never used to do this. i dont have the AC on or anything else when it happens
dunno what the problem is
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Location:
Sydney
Registered:
September 2004
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 03:21
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has your engine not started recently?
like just out of the blue it wouldn't start and you turn the key and push the gas a few times and then it started and it's been fine since?
if that's the case i may be able to help you
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 03:32
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no, it has always started fine
the only time it didnt start was because of a flat battery 
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Location:
tas
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 05:25
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well it could be the usual things, vaccum leaks, idle speed controleller, intake air leak etc.
But just yesterday i solved that same problem for my friends 3sge celica. All i did was increase the idle speed abit and the funny idle whent away, almost like the electrical load was too much for the engine when it's ideling too low. The up and down hunting idle evened out and evetually whent away.
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 06:22
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| dingaling wrote on Mon, 18 October 2004 15:25 |
well it could be the usual things, vaccum leaks, idle speed controleller, intake air leak etc.
But just yesterday i solved that same problem for my friends 3sge celica. All i did was increase the idle speed abit and the funny idle whent away, almost like the electrical load was too much for the engine when it's ideling too low. The up and down hunting idle evened out and evetually whent away.
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any idea on how i can hunt down these things???
like how to find a vacum leak, the idle speed controller etc...?
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Location:
tas
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 08:21
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Well when you turn your car off you should hear a clicking noise wich means the idle speed controller is working, but other ways to test it is by loading the electrical system up and seeing what the revs do. Things like turning your headlights on, brakes on, if it's an auto putting it into gear, heaters on etc. The idle speed controller should increase engine RPM to sustain electrical load. Or at the very least keep the RPM from dropping to low. The Air conditioner has it's own separate idle up controller usually.
Vacuum leaks are tricky buggers to find, one way is to listen for sucking air and trying to pinpoint where the leak is coming from.
Or just visually inspecting all your vaccuum pipes, air intake pipes for cracks, loose clamps etc.
does the car drive perfectly fine otherwise?
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Location:
Melbourne, Vic
Registered:
October 2004
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 08:28
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Remove the air inlet pipe from the throttle body and check inside. Is probably very dirty. Clean with carby & throttle body cleaner & a toothbrush etc. just dont rev the car straight after using this stuff, let it idle for a few seconds once its started. This sought of stuff can bend valves if you give it a hard rev with the plenum chamber full of it.
- Phil
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 08:52
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can you clean the idle speed controller?? where is it located?
im not very good with cars, so i dont want to remove the inlet pipe jsut yet, unless someone can show me
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Registered:
May 2004
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 09:58
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How long have you owned the car and have you or the previous owner had the timing belt changed?
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 10:26
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| colouring_in_book wrote on Mon, 18 October 2004 19:58 |
How long have you owned the car and have you or the previous owner had the timing belt changed?
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owned it since new, cahnged the timing belt in august
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Registered:
May 2004
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 10:38
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Are you familiar with the diagnostic terminals?
If so, what code did you get and I will see what the code says.
The code doesn't always pin point the exact problem, but it does give you a more refined area to carry out your tests in.
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 10:56
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| colouring_in_book wrote on Mon, 18 October 2004 20:38 |
Are you familiar with the diagnostic terminals?
If so, what code did you get and I will see what the code says.
The code doesn't always pin point the exact problem, but it does give you a more refined area to carry out your tests in.
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i havnt plugged in teh diagnostics, simply becasue i dont have thos readers, nor does my mechanic
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Registered:
May 2004
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 11:14
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In your engine bay you will have a diagnostic terminal.
If you have ever been poking around in your engine, I am positive that you would have seen this.
If you can bridge out the two terminals labelled TE1 & E1, then switch your ignition onto reds you will noticethat your engine light will begin a sequence of flashes.
For example the engine light may flash twice, indicating the number two, then may flash four times indicating the number four.
Then if it goes back to flashing twice, then four times, this will indicate that you only have one code within your ECU.
24 may indicate a problem with your coolant temperature sensor circuit. Which will be easier for your mechanic to diagnose if he knows where to start.
If you feel confident in carrying out the above procedure and post your codes on here, then I will check what the codes are at work for you.
If you do not, then get your mechanic to follow these procedues and give the codes to you.
REMEMBER: there may be more than one code, however the codes are no more than two digits long.
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 11:23
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| colouring_in_book wrote on Mon, 18 October 2004 21:14 |
In your engine bay you will have a diagnostic terminal.
If you have ever been poking around in your engine, I am positive that you would have seen this.
If you can bridge out the two terminals labelled TE1 & E1, then switch your ignition onto reds you will noticethat your engine light will begin a sequence of flashes.
For example the engine light may flash twice, indicating the number two, then may flash four times indicating the number four.
Then if it goes back to flashing twice, then four times, this will indicate that you only have one code within your ECU.
24 may indicate a problem with your coolant temperature sensor circuit. Which will be easier for your mechanic to diagnose if he knows where to start.
If you feel confident in carrying out the above procedure and post your codes on here, then I will check what the codes are at work for you.
If you do not, then get your mechanic to follow these procedues and give the codes to you.
REMEMBER: there may be more than one code, however the codes are no more than two digits long.
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Wow thanks for the info
i know where the diagnostics plug is.
so when you say bridging as in jsut running a wire from one to the other?
when you say turn the ignition to red, what do you mean? simply turning hte key???
i will have a peek tomorrow and see if i can do it
thanks again
[Updated on: Mon, 18 October 2004 11:25]
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Registered:
May 2004
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 11:27
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Not a problem, anytime! 
If you want, when you get the codes let me know what it/they are and I will be able to point you in the right direction!
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Mon, 18 October 2004 11:50
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was i right with the info im assuming i have to do?
briding the wire, and ignition?
i edited my last post
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Registered:
May 2004
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Re: varying rough idle on 96 camry
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Tue, 19 October 2004 08:36
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Yes that is correct.
Joining these two aforementioned terminals with a common wire, not allowing it to come in contact with anything else, just the two terminals.
When I mention "reds" i mean , turn the ignition key until all of your red dash lights appear.
To put it in a more simpler term, switch the key to the on position on your ignition barrel.
Good Luck.
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Location:
Melbourne, Vic
Registered:
October 2004
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Re: varying rough idle on 96 camry
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Tue, 19 October 2004 09:12
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Just a tip. With toyotas, apon retrieving dtc's through bridging diagnostic connecter, each code will flash 3 times in a row, before continuing onto the next. Saves you having go through the procedure twice, wondering why you didnt see that other code in the first place.
Good luck
-Phil
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Location:
Castle Hill, Sydney
Registered:
February 2004
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Re: varying rough idle on 96 camry
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Tue, 19 October 2004 09:23
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ive heard of this happening before, it was the vacumn from the brake booster that brings down the idle upon brakeing, only waY to fix it i think was to wind up the idle a bit
just a thought...
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Registered:
May 2004
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Re: varying rough idle on 96 camry
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Tue, 19 October 2004 09:48
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No, the only way to eliminate that problem would be to replace your booster seal, or if unable to do it your self, have your booster overhauled by a brake specialist.
Jacking up the idle will only hide the problem, not fix it.
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Wed, 20 October 2004 01:50
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i did the bridging, and my engine light and O/D light kept flashing non stop
is that a major problem?
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Registered:
May 2004
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Re: varying rough idle on 96 camry
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Wed, 20 October 2004 07:51
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No, that just means that there are no codes stored within the ecu's memory.
Meaning that it will more than likely be a mechanical item like an ISC valve or somethingh to that effect.
You can ofcourse take it into your toyota dealer and have them carry out a code check with the intelligence tester. Just to be sure you know. But if you have carried it out properly (going by the resukt you have given), then I don't really see a need to.
If you are confident that you could have a go at cleaning out your ISC valve on your own, this would give you a fair indication of whether you are in the right area of your problem or not.
Just use crburettor cleaner. If you are not confident on carrying out this procedure yourself, then it may pay to have your mechanic clean out your ISC valve and the associated ports and piping for this component.
The job in reality should not take anywhere out of the vicinty of 20 - 30 mins for a mechanic to carry out a thouroough clean, inspection and test.
Let us know how you go!
If you were in the Sydney area I would be more than happy to do it for you
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Wed, 20 October 2004 11:03
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ahh sweet
im not made of money so i want to learn to do things myself
i want to do the cleaning, but i need instruction on what to remove and stuff... hopefully someone here can help me with that?
if they have removed it before?
thanks again colouring
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Registered:
May 2004
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Re: varying rough idle on 96 camry
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Thu, 21 October 2004 02:47
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Not a problem at all.
Off the top of my head I can't exavtly remember where it is, However you will be able to easily identify this component.
The ISC valve should be attached to the inlet manifold and from the isc valve there should be a pipe which extends to the air intake pipe.
If you cannot see it you will only need to remove the air intake pipe and look into the throttle body, you will then see a small port before the throttle butterfly.
At the base of this port you will find you ISC valve and associated piping.
You will only need to clean all of these ports, pipes and ISC valve with carburettor cleaner, or upper engine cleansing foam. This is great stuff but generally harder to obtain than Carby cleaner.
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Thu, 21 October 2004 03:29
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thanks again
i will post a pic tonight, so i can get a beter idea of what you are talking about
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Registered:
May 2004
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Re: varying rough idle on 96 camry
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Thu, 21 October 2004 03:34
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Sure, no worries.
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Location:
melbourne, australia
Registered:
June 2002
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Registered:
May 2004
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Re: varying rough idle on 96 camry
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Thu, 21 October 2004 12:37
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Hey man, I had a look at your photos, they are good, however I must have a look on my own tomorrow at work for myself.
Because the two actuators at the rear of the throttlebody (including the actuator with the large pipe connected which runs to the air intake pipe), I am going to see how this setup works completely and then discuss it here so that you can carry out the necessary servicing of the system.
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Fri, 22 October 2004 03:00
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sweet
thanks again colouring!!!
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Registered:
May 2004
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Fri, 22 October 2004 08:32
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ok well ive kind of got the diagrams
cept i dont know where the no.5 air hose is?
and do i have to go into toyota to get a gasket?
also would i have to screw it back in with specific torque settings??
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Registered:
May 2004
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Re: varying rough idle on 96 camry
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Fri, 22 October 2004 08:43
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If you have a look at the first picture you will see that the hose is under the ISc Valve, and the diagram also points at it calling it the water bypass hose, this is hose no.5.
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Fri, 22 October 2004 09:30
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ok ive taken a closer pic
is this right?
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Mon, 25 October 2004 03:54
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i dont want to unbolt the valve, as i dont know the torque settings
would spraying carby cleaner in teh pipes help at all?
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Location:
Campbelltown, NSW
Registered:
November 2002
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Registered:
May 2004
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Re: varying rough idle on 96 camry
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Mon, 25 October 2004 09:58
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In your picture you have two hose clamps circled.
Its not the one in front, it's the one behind and underneath (that is within your circle)
The other two are coolant recirculation pipes.
The gasket is metal and only small so it wont cost an arm and a leg, but if you wish to spend no money at all, then don't just put it straight back on. Because the gasket is meatl, it will not tear.
However the teflon coating may stick to the two mating surfaces so you will need to fit it back up in the same way you removed it.
But in reality, i donot see the gasket costing you anymore than $10 form anywhere (even a little bit more and you can have a genuine one, but then you will be required to remove all of the old gasket off the two mating surfaces.
The two bolts have a torque setting of 13nM.
Sorry for the delayed response, wont happen again
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Location:
melbourne, australia
Registered:
June 2002
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Re: varying rough idle on 96 camry
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Mon, 25 October 2004 10:50
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nah its fine dude, you're helping me out, so i appreciate it
ill have a fiddle some more tomorrow and see if i can see the pipes
is it possible to take apart that bigger air pipe to the valve and give it a clean inside?
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Registered:
May 2004
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Re: varying rough idle on 96 camry
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Mon, 25 October 2004 11:34
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Of course it is, but it is plastic so be careful so that you do not destroy any of it, because your car will run like a busted arse until you get another one.
Don't just pull it, make sure you twist and pull it at the same time, if this does not work, just keep twisting it until the seal between the pipe and the housing separates then remove it.
You may also have to add some WD-40 to free up the bond between the two components.
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Location:
melbourne, australia
Registered:
June 2002
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Registered:
May 2004
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Re: varying rough idle on 96 camry
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Mon, 25 October 2004 14:05
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No worries, your gratefulness is just as good as a nice frosty glass of old!
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