RedVR6 0 Posted December 27, 2009 Report Share Posted December 27, 2009 Can someone tell me what the piece is circled on the photo. The Golf has developed a habit of cutting out, and having very erratic idle speeds - going between 400 and 2k rpm. Having read what I could, I understand about the idle stabilization valve and also that air leaks can cause this. I have put some insulation tape around where I think I can hear a leak, but am unsure of what this part is and I don't want to pull it off, only to have it break until the shops are open again. At least the car is performing normally apart from this idling issue. ThanksGavin Link to post Share on other sites
Moochalargo 0 Posted December 28, 2009 Report Share Posted December 28, 2009 Idle problems are usually caused by the maf (mass airflow metre) thats the bit after the airbox with the electrical connection on it!Dont think we have idle stabilisation valves on the vr!?? Link to post Share on other sites
thegoth 5 Posted December 28, 2009 Report Share Posted December 28, 2009 OBD1 models do have an ISV. And a 'silencer' - a 3" lozenge shape thing - which does hiss a bit internally even when air tight. The valve itself can get clogged by oil and is easy to clean with carb cleaner.Is the problem worse when hot or cold? Link to post Share on other sites
RedVR6 0 Posted December 28, 2009 Author Report Share Posted December 28, 2009 Hey, thanks for the help. The car was 'off the road for 6 months and I've just got it roadworthy again. When I first started it, the idling was very unstable, in fact it wouldn't idle initially. However, it's been running good for a couple of weeks now and 2 days ago started this. The problem seems to be after the car has warmed up now, as it starts with a little idle fluctuation, then cuts out after engine hot. Link to post Share on other sites
kie_dub 0 Posted December 28, 2009 Report Share Posted December 28, 2009 Try to clean the MAF and the ISV see if this solves the problem, dont touch the MAF though just spray electrical contact cleaner on it, you can buy it from halfords etc, make sure it dries before you start the car because ive heard it can cause a fire etc if its still wet. Doesnt take long to dry though. Clean the isv with carb cleaner, making sure you have cleaned all of it fully, this can be touched, hope this helps and good luck with solving the problem Link to post Share on other sites
RedVR6 0 Posted December 29, 2009 Author Report Share Posted December 29, 2009 Spent an hour at the local VW garage yesterday, He took out and cleaned what I think is the ISV and it was full of black, greasy sh1t. Also discovered the water temp sender was mis-reading, so replaced that too. Car running much better, idling is stable and only cutting out occasionally. I'm off on a 150 mile round trip today with a bottle of cleaner in the tank. If this doesn't cure completely, the ISV will need to be replaced.Thank you for your suggestions. Link to post Share on other sites
RedVR6 0 Posted January 2, 2010 Author Report Share Posted January 2, 2010 The car was still not 100% after the trip with the system cleaner in the tank, so I was thinking a new ISV would be needed. However, having heard good things about Shell V-Power fuel, decided to try that. This seems to have finished the cleaning job as one time, the car coughed and gave out a bit of blue smoke from the exhaust and has run perfectly ever since with no erratic idling or cutting out.Thanks again for the help and suggestions. Link to post Share on other sites
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