Hig Posted July 30, 2016 Share Posted July 30, 2016 Hi all, I start my car cold in the morning / evening and my car drives fine, until I get to roughly operating temperature, at which point between 1500 - 2500 revs the rev needle bounces uncontrollably. I would say this happens for roughly half a minute, at which point the issue will resolve itself (unless I drop a gear to raise the revs first). My car is up-to-date on servicing, has been re-mapped (but the issue was there before then) and only has a Scorpion cat-back and Cosworth filters fitted. My car is a 2007 HR, and other than this and the clicking axle (which I'll sort), she is perfect! Any help is appreciated! Matthew Quote Link to comment Share on other sites More sharing options...
KyleR Posted July 31, 2016 Share Posted July 31, 2016 So only the needle jumps, the revs actually stay the same? Quote Link to comment Share on other sites More sharing options...
Hig Posted July 31, 2016 Author Share Posted July 31, 2016 The revs jump as well, the car judders because of it ... That's me not being clear! Quote Link to comment Share on other sites More sharing options...
Ollydykins Posted August 1, 2016 Share Posted August 1, 2016 Crankshaft sensor going? This happened with mine... But my CEL light would come on Quote Link to comment Share on other sites More sharing options...
KyleR Posted August 2, 2016 Share Posted August 2, 2016 MAF? Maybe it's a bit dirty. Couldn't hurt to take it out and clean it with some contact cleaner and see if it helps. If not it could also be the throttle body if it's dirty also. Quote Link to comment Share on other sites More sharing options...
Hig Posted August 2, 2016 Author Share Posted August 2, 2016 (edited) If something was dirty though would I not always have the issue? Not just at one specific point? Edited August 2, 2016 by Hig Quote Link to comment Share on other sites More sharing options...
KyleR Posted August 2, 2016 Share Posted August 2, 2016 If something was dirty though would I not always have the issue? Not just at one specific point? Honestly I don't know enough about it to say for certain. I just know that I have seen a number of times people having or erratic idling or rev issues and it was tracked down to either the MAF or air filter element. Quote Link to comment Share on other sites More sharing options...
Hig Posted August 25, 2016 Author Share Posted August 25, 2016 Has anyone else any thoughts on this? / Has anybody else had this problem? Quote Link to comment Share on other sites More sharing options...
Roscoe Posted August 27, 2016 Share Posted August 27, 2016 A remap will sort this problem. What's your oil pressure like on hot idle? Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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