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Model specific boards => Golf mk4 => Topic started by: MoMartin on 28 March 2014, 22:21
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Hi, i've seen this posted on here a few times now, but i have followed the guides and it has had no success.
The problem I am Facing is that the car is idling very erratically - ranges between 500rpm and 1800 rpm, It also seems to sometimes stall when i dip the clutch (or mid way between gears (it bump starts itself)) or on the other hand it keeps the revs up at around 1550rpm, until i engage the clutch again. This problem is very annoying and also quite dangerous; when it stalls you barely notice the sound change so when you go to pull away there is nothing there, or on the other hand it stalls whilst your moving, then when you let the clutch back in it will either bump start or stop all together.
What is almost always suggested is that it is a dirty throttle body, though, i have cleaned it thoroughly and it still hasn't made any difference.
Are there any other things i should check? - and i am going to use a vag-com to assess it this monday.
Thanks in advance, Mo
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Hi,
Go for the vagcom, that will tell you a lot of areas to look at but being an AGU I dont know how much they give away. I'd also consider the MAF sensor. Try unplugging it for a drive an d see if the problem persists? If not these, then you could be looking at a boost leak somewhere - get it smoke tested.
No misfires?
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After cleaning it did you "turn your ignition on and leave it on for 30 odd seconds without starting it, then turn the ignition offf, then back on and start the car"?
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There are no misfires, and no I didn't leave the ignition on for 30 seconds, I'm going to take the battery off for 30 mins a bit later to reset the ecu, until I can get it checked by vag com.
Thanks, Mo
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Probs throttle body needs reset. As you most likely have lost the basic settings for it. Its happened to mine mk3 gti and people said no you cant reset it. But after calling someone out they managed to reset it. Mechanics said to be your throttle is fooked and another one. But the guy knew what he was doing.
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Okay thanks, Would i be able to just disconnect the battery for 20 mins to reset the ecu / throttlebody? or does it have to be done by vag com?
Thanks, Mo
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hi is it a cable throttlebody or electronic one as the cable resets it self after a while
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It's the cable one, but i've read that the ecu still needs to be reset though
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Cable 1s dont need resetting
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Are you sure the plug on the side of the TB is all good cos I forgot to plug that in and wow that was bad
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air leak, I'm going for the S shaped one under the inlet manifold that connects to the PCV
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All plugs surrounding the throttle body are plugged in, throttle body has been cleaned, I unplugged the maf sensor to try that, but it just ran really rough, and stalled unless I kept my foot on the throttle.
I'm booked in for a vag com diagnostics test on Tuesday, so I'll see if any error codes appear then.
Thanks, Mo
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air leak, I'm going for the S shaped one under the inlet manifold that connects to the PCV
+1 with this too :wink:
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An update on the problem -
Cleaned the throttle body
Found out that the guy who i bought my car off fitted the dump valve wrong ( huge vacuum leak, so that wouldnt help!)
(both didnt sort the problem, but they both helped the problem)
Also got my VAG COM today, cleaned all fault codes, and now it is running fine!
I haven't taken it out for a long drive yet, but by the looks of things, it should be fixed.
Thanks for the support