| Author | Topic |
|---|
Location:
Sydney - Seven Hills
Registered:
January 2005
|
|
4agze idle issues
|
Tue, 22 February 2005 13:05
|
 |
Hey guys.
Just posting a problem up that im having with my car and wanting to know if anyone has had a similar issue or has any constructive input to add.
Please be patient as I am in all honesty a NOOB when it comes to cars.
Here it is,
I have a Sprinter with a 4agze engine (best drive of my life and I loose myself driving it because it is such an awesome feeling). The major problem I am having now is this.
When the car revs to over 3k rpm, and you clutch in. The revs drop quickly and then keep dropping until the car stalls.
(Yeah ive learned to heel toe pretty well recently to stop this).
But its quite annoying.
Not only that but sometimes the car will be idling at around 600 which is what it is set to by the mechanic, but then like today. It was idling around 2.5k rpm... WHAT THE?!?!
I have had one mechanic tell me that its the air flow meter that needs to be readjusted. I have had another tell me that it is the wiring from the ecu that needs to be re done as it appears to be bad (then he said that he would have to find gze wiring diagrams so that might take a while to source... which i managed to find from http://www.club4g.com for those interested). Note that both these mechanics mucked around with the idle and I know that the last one also adjusted the air flow sensor as well.
Now the last mech I went to, although they appeared to know what they were doing, they said that it is probably the ecu (I thnk its a stock ecu in there)
He also said that the last mech mustn't have known what he was doign because he adjusted the air flow meter and changed settings that should have not been changed.. *sigh*
But with that said he also adjusted the idle control (or something... this is where my noobness comes into play...) Where he set the idle sensor to no circuit when it was meant to idle and then it had a circuit when there was throttle. (man thats another thread in itself, I'd really like to know about that actually...)
Well all in all. This appeared to fix it but it started playing up again when I had left.
Now the thing is this. My baby is moody. Like a girlfriend with pms (I have to tip toe around all the time) but it happens every 2nd day!!!
It appears to be much better as well once you warm her up properly for about 4-5 mins and then give her a little open throttle loving. She tends to act normally. Otherwise she likes to just stall when clutching in.
The bottom line is this for those with attention spans long enough to have read the problems/story/spiel. What are peoples opinions of the problem?
Has anyone had this issue before and has any idea of what it could be?
Cheers in advance guys
|
|
|
Location:
Bundaberg, Qld.
Registered:
May 2002
|
|
Re: 4agze idle issues
|
Tue, 22 February 2005 21:05
|
|
the bypass adjustment on the AFM will only really effect the car at idle i've found. after i did my turbo conversion on the 4agze i had the same problem of the car stalling after i revved it/coming to the traffic lights etc. i adjusted the AFM bypass out (anticlockwise a couple turns) so it allowed more air past the flapper when i closed the throttle. and then i adjusted my idle with the idle adjustment screw thats on your throttle body to set my idle (when the car is warmed up) at 900 rpm.
maybe a diagnostic check on the ECU might even show a code as to a faulty sensor or something. this might help.
http://www.club4ag.com/faq%20and%20tech_pages/ECU% 20Diagnostic%20Codes.htm
|
|
|
Location:
Sydney
Registered:
September 2004
|
|
Re: 4agze idle issues
|
Tue, 22 February 2005 21:31
|
|
|
dont worry natskis im having the same problems, i thought it might have been the spark plugs or the leads but i think feral is right on the money
|
|
|
Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
|
|
Re: 4agze idle issues
|
Tue, 22 February 2005 22:31
|
|
let the car get to operating temps and fiddle with the idle there.
I can't remember if the AFM gze has the ISCV (idle speed control valve) or not, but i would have thought that this would be helping to control the problem.
Next thing - your mechanics sound a little silly.
Setting the idle to 600rpm is stupid, it's not a V8. Blaming the wiring is equally dumb... how does that effect idle?
idle should be 900rpm at full operating temps, and higher when cold thanks to the auxilary air valve.
|
|
|
Location:
Canberra
Registered:
May 2002
|
|
Re: 4agze idle issues
|
Tue, 22 February 2005 22:55
|
|
The AFM ZEs use a isc valve, the best trick I've found is to get a multimeter with a duty cycle function and hook it up to the isc.
Get the car to normal operating temperature, then adjust the idle bypass screw on the TB until the duty cycle of the isc is around 50%, that way it's got heaps of throw either way.
|
|
|
Registered:
February 2003
|
|
Re: 4agze idle issues
|
Tue, 22 February 2005 23:39
|
|
Dude
I have an AFM 4AGZE in an AE86 as well, and let me tell you, I have the same problem and so will alot of other RWD 4AGZE setups. The problem is within the airflow of vacuum, mainly in converting the IC piping to RWD, and i've also read from sources that the inlet and supercharger manifold designs affect this too.
I've put up with it for 3 years, just by adjusting the idle screw and AFM bypass adjustment as feral said (but don't get too fidly otherwise you'll just muck it up).
I heel-toe constantly (boy what practive it develops!) and I've also developed a somewhat sixth sense as to what my engine is going to do on any given day, temp/moisture wise  but all in all its an absolute motherf*^ing pain in the ass which you will have to put up with.
Mine is soooo temperamental, on some drives it is normal, but on other days it just KEEEEEEPS stalling, no matter how many times i rev it.
But the best solution i've found is to replace the AFM with a newer/better condition one, or just go aftermarket ECU.
|
|
|
Location:
Sydney
Registered:
April 2004
|
|
|
Location:
Sydney - Seven Hills
Registered:
January 2005
|
|
Re: 4agze idle issues
|
Wed, 23 February 2005 02:10
|
|
When you do adjust the AFM, is there any chance that it will damage the car in anyway? For example... can it make it run too rich or lean e.t.c.?
And what does in affect when you do adjust it? How can you tell it is doing anything? (just asking to make sure I dont adjust it too much not knowing what im doing and destroy anything)
|
|
|
Location:
Canberra
Registered:
May 2002
|
|
Re: 4agze idle issues
|
Wed, 23 February 2005 02:20
|
|
|
He probably just adjusted the idle mixtures - It shouldn't hurt much..
|
|
|
Registered:
February 2003
|
|
Re: 4agze idle issues
|
Wed, 23 February 2005 03:09
|
|
| natskis wrote on Wed, 23 February 2005 13:10 |
When you do adjust the AFM, is there any chance that it will damage the car in anyway? For example... can it make it run too rich or lean e.t.c.?
And what does in affect when you do adjust it? How can you tell it is doing anything? (just asking to make sure I dont adjust it too much not knowing what im doing and destroy anything)
|
no it won't.
just run the car at operating temp and try to make the car idle roughly ie. go for a drive, stop on side of road when idle is hunting and pop the bonnet.
then use a screwdriver and turn the screw anti clockwise and see if the idle steadies up. Don't adjust too dramatically tho, don't wanna fuck it up further.
another trick is to take the terminals off the battery and let the ECU 'reset' overnight. Had no success for me.
I'd say your AFM has had it.
solution? Turbo !!! 
|
|
|
Location:
Sydney - Seven Hills
Registered:
January 2005
|
|
Re: 4agze idle issues
|
Wed, 23 February 2005 03:14
|
|
| ae86slaver wrote on Wed, 23 February 2005 14:09 |
I'd say your AFM has had it.
solution? Turbo !!!
|
I like your style!!!
Hmmm maybe the first mechanic was right about the AFM then 
|
|
|
Registered:
February 2003
|
|
Re: 4agze idle issues
|
Wed, 23 February 2005 03:32
|
|
he could be.
but inevitably, you just have to accept that the GZE will idle roughly sometimes.
My old AFM was stolen (HAHAHA suck on teh phat one dipshits  ) and it idled like a dog, i adjusted it ten billion times but would never hold. I then bought one that was in awesome condition, wacked it on and NEVER had any issue on the following drives - i'm talking 98% holding idle, and 2% stalling at lights - it was a dream!
but lately it's been happening all too often like the old days.
on another note - did you happen to buy leaven's White GZE?
|
|
|
Location:
Melbourne
Registered:
May 2002
|
|
|
Location:
Toronto, Downtown
Registered:
September 2004
|
|
Re: 4agze idle issues
|
Wed, 23 February 2005 07:38
|
|
could need tps adjustment
|
|
|
Location:
Sydney - Seven Hills
Registered:
January 2005
|
|
|
