BrettS 10 Posted February 6, 2015 Having a issue with my vr6. Had a problem with revs hunting and some times it would cut out after giving it some beans then coming to a stop. Cleaned out the isv and it did cure it for a short while. How ever when starting it now it will run for a few seconds as soon as the revs settle to idle it will cut out, unless you get back on the throttle and will run fine unless you back off the throttle and it will cut out. How ever after 5 minutes of driving it will pretty much rectify itself. And will idle fine, sometimes it will struggle. Now I have fitted a new pattern idle control valve and it would start, then cut out, start and cut out then start and idle correctly. That was yesterday. This morning it started and cut out again every time it came to idle until again 5-10 mins later and the idle would improve. I have taken off the new valve, clean again the old one and checked the valve opens freely and it does fine. Came to try it and still the same. The new idle control was hunting for revs slightly on idle were the old one didn't seem too. Coolant level is at max. And no airleaks that I can find. Am I right to consider the coolant sensor could be at fault? If it was a immobiliser issue it would surely cut out even if I gave it some revs before cutting out. Any ideas? Quote Share this post Link to post Share on other sites
Jim 2 Posted February 6, 2015 You could do with trying a known good / working idle valve to be honest, to rule it out 100%. We've had a lot of talk of idle issues on here over the years, and indeed had the pain on one of my valvers some years back - and for all the other stuff to check, it's almost always the frigging ISV! :) Quote Share this post Link to post Share on other sites
BrettS 10 Posted February 6, 2015 Thing is, there's not a lot to go wrong with them. And the Bosch units are pretty robust. Also fitting a brand new patten one should be a fix. But as you point out it could be faulty. Need to track down a good one, as there is no way I'm paying £300 for a new Bosch one. My bank account doesn't match Elton johns. Quote Share this post Link to post Share on other sites
BrettS 10 Posted February 7, 2015 Found the fault/faults. Found a small fuel leak from the injector rail fuel pipe connection, maf plug had pulled out and new pattern isv valve is in fact faulty. Running fine now Quote Share this post Link to post Share on other sites
