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Location:
Castle Hill
Registered:
August 2003
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4AGE Bigport hunting at idle?
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Sun, 08 May 2005 08:13
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I just put a 4AGE bigport in my AE86, it runs beautifully!
But it is not idleing properly, it goes from around 1000 up to 2300 over and over.
When I disconnect the vaccum sensor it idles, but up at just over 2k and drives like crap. Connected another vaccum sensor and same thing happens?
I did a search but could not find any explanations for how to solve the problem?
The engine ran fine in the AE82 it came out of, the only thing that was changed was a pod filter inplace of the airbox, and a RWD intake manifold instead of doing a cut and shut.
The intake and exhaust gaskets are all brand new, and I am using the fuel pump from the AE82 mounted in my tank with an extended bracket.
also... even with vaccum sensor connected it idles really high, that prolly doesn't make sense with info above...explanation: When I take my foot off the clutch it drives forward, as if accelerator is being pushed and held at about 2-2.5K?
Has anyone had this problem and solved it?Can someone please help me out?
I am very grateful for any info you guys can give me!
Thanks in advance.
-Whitchy-
[Updated on: Sun, 08 May 2005 08:39]
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Location:
Melbourne
Registered:
January 2005
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Re: 4AGE Bigport hunting at idle?
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Sun, 08 May 2005 09:19
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Hey mate,
I have also recently installed a bigport 4age into my 86 and had a similar prob, what i would do first is check all of the vacuum lines to make sure they are connected correctly. If you dont know where they go just block every one! thats what i did and it works a treat, you'll also have to block a couple of holes which go between the front and rear of the throttle body, its pretty easy just take it to bits and you'll see how it works. Just put a rubber bung in the hole. Just remember to reconnect the charcoal canistor, there is a little pipe marked with a C on the top of the throttle body just run a hose from there to your CC. Also to run a pipe to your brake booster and rocker cover, so that you run the blow by back into your engine. Or run a catch can which is good if you do a bit of track work and hard driving.
good luck!
Craig
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I supported Toymods
Location:
melbourne
Registered:
June 2002
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Re: 4AGE Bigport hunting at idle?
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Sun, 08 May 2005 09:37
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do a search, i had this problem about a month ago and solved it quite easily,
if the search doesnt work, click on my profile and "show all posts by this user" and find the thread.
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Location:
Castle Hill
Registered:
August 2003
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Re: 4AGE Bigport hunting at idle?
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Sun, 08 May 2005 10:32
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So it is to do with the water lines running into the throttle body? Cause when I modded the water lines I didn't run any to the throttle body, but others I have spoken to have done the same thing and not had any problems?
So all I should have to do is block the two pipes at the bottom of the throttle body?
Thanks heaps for the info so far!
Cheers.
-Whitchy-
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Location:
Melbourne
Registered:
January 2005
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Re: 4AGE Bigport hunting at idle?
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Sun, 08 May 2005 10:38
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no no,
i was reffering to the vacuum lines, running water lines to the throttle body wont do anything once you block the holes that i've mentioned, have another read of my comments
craig
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Location:
Castle Hill
Registered:
August 2003
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Re: 4AGE Bigport hunting at idle?
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Sun, 08 May 2005 11:10
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yeah all the vaccum lines are blocked off except the one to the charcoal canister and the vaccum sensor???
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Location:
Somewhere on a dirt bowl ...
Registered:
August 2004
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Location:
Melbourne
Registered:
January 2005
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Re: 4AGE Bigport hunting at idle?
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Mon, 09 May 2005 10:35
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what we're trying to say is that it is a vacuum leak, you should be able to hear a hissing sound somewhere if this is the case. Be sure to block the internal passages as i mentioned as this will cause the greatest amount of problems
good luck
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Location:
Somewhere on a dirt bowl ...
Registered:
August 2004
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Re: 4AGE Bigport hunting at idle?
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Mon, 09 May 2005 15:38
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To a point.
How about the fuel pressure regulator ? Have you connected that up ? If so, did you connect it to the right spot on the manifold.
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: 4AGE Bigport hunting at idle?
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Mon, 09 May 2005 21:37
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| WHITCHY wrote on Sun, 08 May 2005 20:32 |
Cause when I modded the water lines I didn't run any to the throttle body,
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so why exactly did you do that?
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These 2 temp sensors at the back of the head. One is used for idle control, from memory its the 1 with the green connector.
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yea, a faulty coolant temp sensor doobie could cause a bouncing idle.
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Location:
NSW, East Coast
Registered:
July 2003
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Re: 4AGE Bigport hunting at idle?
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Tue, 10 May 2005 05:11
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or it could be as simple as a dirty throttle body?
But searching between 1000rpm and 2300rpm is a big bounce.
Cheers
Steve
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Location:
Terrigal
Registered:
May 2002
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Re: 4AGE Bigport hunting at idle?
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Tue, 10 May 2005 05:26
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Anyone think the TPS being way out of adjustment could cause this?
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Location:
Somewhere on a dirt bowl ...
Registered:
August 2004
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Re: 4AGE Bigport hunting at idle?
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Tue, 10 May 2005 09:48
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| feral4mr2 wrote on Tue, 10 May 2005 07:37 |
| Quote: |
These 2 temp sensors at the back of the head. One is used for idle control, from memory its the 1 with the green connector.
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yea, a faulty coolant temp sensor doobie could cause a bouncing idle.
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Well its only an idea. Cause it does happen when you dont have any coolant around the sensor. Try it and see what happens then pull the plug and see what happens.
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Location:
Castle Hill
Registered:
August 2003
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Re: 4AGE Bigport hunting at idle?
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Wed, 11 May 2005 02:31
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OK the problem is fixed...Thanks heaps to Joel for fixing it and you guys for the info.
Turned out the be a few things, the TPS was not aligned properly, causing the irratic idle, then once that was setup properly it idled rather high, found about 3 separate vaccum leaks, fixed them and idle dropped to 2k but it is steady now.
The idle up valve is sucking in too much air causing it to idle so high, even with the idle screw in all the way.
Suspected F**Kd throttle body.
Will take throttle body off a spare intake and test that out, hopefully that will fix it completely!
Thanks again for any help and info!
Cheers.
-Whitchy-
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Location:
Terrigal
Registered:
May 2002
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Re: 4AGE Bigport hunting at idle?
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Wed, 11 May 2005 03:49
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Hey Whitchy i thought i might make up some alloy plates to block off the idle control junk under the throttle body. Want me to make one for you? If you taking the throttle body off would be a good time to put it on.
Cheers
Joel
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Location:
Castle Hill
Registered:
August 2003
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Re: 4AGE Bigport hunting at idle?
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Wed, 11 May 2005 04:52
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yeah, thatd be awesome!Thanks Joel!
Let me know when it is ready and I will pull some funds together and come down for a visit and grab it!Thanks heaps!
-Whitchy-
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