Idling hunting problems

HI all, I really need your guys technical knowledge!

I have a 2000 (W) reg VW Golf 1.6 8v SR (AKL) engine.

It ran fine.. but would not start on the key, unless you blipped the throttle. So after reading up on various forums I decided to remove the throttle body and clean it with carb cleaner.

Did all this, and also cleaned the air flow meter.

Put it all back together and the car started first turn of the key! how ever idled at 1200rpm. then when you touch the throttle it return to 1300- and then hunts between 1200 - 1600 rpm.

So... I then called my friend who has vagcom he went in and checked for fault codes. nothing.. he then tried to do a throttle adaptation... but this fails every time and says not supported. if you do a reset it says reset then throws an error code saying unable to complete.. so he said go get a replacement throttle body...

so £75 later for a refurbished unit and fitting it all, I am still back at the same problem..

went to my local garage who I know well, he connected it to Snap-On Solus diagnostics. tried to perform a adapation and again says on both throttle bodies (not supported) so then he tried a reset. it says reset performed.

start the car... same problem still idles fast and hunts... as soon as you touch the pedal.

So took it to another friend who has a snap on verus diagnostics...

he said.. change the coolent temp sensor... £33 later from VW and same issue.

He then tried to carry out a reset, it says it has done this and if you watch the throttle body the butterfly valve moves.

but when you start... same issue.. I checked all earths under the battery and cleaned them. still same issue.

He called a tech at audi, they said try the relay .. replaced that.. same issue...

I am getting to the end of my patience now no matter what I try it does not seem to make any difference. and until I cleaned the throttle body it was fine and only would not start on the key unless you blipped the throttle....

Now when you scan the car for faults on versus (snap-on) you get error code..

00533 - idle speed regulation lower stop value

we have checked all vacuum's for leaks, checked air intake pipe and no leak. checked the gasket between throttle body, checked the inlet manifold for leaks.. and nothing... yet it still hunts and idles fast...

if you disconnect the mass air flow after about 15 seconds the engine returns to 900rpm but runs rough, and the hunting stops...

any help guys would be really really appreciated...

any idea why we are not able to run adaptions in vagcom?

Many Thanks.

Reply to
Matthew.Ridges
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Quite possibly the MAF, it died on my car 3 years ago and I had similar sort of issues. In my case, it was giving a higher reading then expected and causing the system to overfuel.

You can test it with a voltmeter connected on pins 1&2. Should be 1.1V at idle, rising to 1.7V at 3000rpm (information from autodata).

Stu

Reply to
Stu

On Thu, 01 Jul 2010 00:15:01 +0100, Matthew.Ridges wrote= :

connect vag-com & drive it down the road recording the maf output, then = go & compare it with the forum results. & probably check again for any vacu= um leaks

Reply to
Duncan Wood

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