viper Posted December 26, 2012 Share Posted December 26, 2012 Iv finally got the car sorted but since having the new r154 box and lightened flywheel the idle is low and every now and then when changing down to first from second the engine will stall. I'm guessing its because the idle is low. Could this be something to do with the lightened flywheel? There's no boost or air leaks. I know there's no idle adjustment screw and all I can find about idle adjustment is adjusting the throttle cable directly which doesn't seem right. Any advice would be much appreciated. Quote Link to comment Share on other sites More sharing options...
Rich.2211 Posted December 26, 2012 Share Posted December 26, 2012 Could it be the idle air control valve playing up? in which case try giving it a good clean.. here's a guide.. http://www.mkivsupra.net/vbb/showthread.php?210956-How-To-Clean-Idle-Control-Valve-Cleaning-Aka-ICV-(IAC)&highlight=idle+control+valve Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 26, 2012 Share Posted December 26, 2012 A very light flywheel will often make for an unsteady idle, but not a low idle speed. NA's are a PITA when they get old, and often suffer a low idle. The idle speed control valves gum up, go electrically faulty, and can cause this. as can worn or incorrectly set TPS sensors. Air leaks may cause it. The first thing to do is get a garage to put a `scope on the IAC valve inputs at the valve and see if the ecu is trying to control it properly (15 minute job). If it is, and the TPS sensor and throttle positions are set *PRECISELY* as per the factory manual, you can probably safely assume it needs a new IAC valve assembly. They are costly! Cleaning rarely works for long, they just seem to get tired, or a coil in them fails and goes open circuit. Quote Link to comment Share on other sites More sharing options...
TheTurtleshead Posted December 26, 2012 Share Posted December 26, 2012 Is it also limited to 5.8k revs in the higher gears? I.e. 3rd / 4th? It's an auto to manual conversion as well isn't it? Quote Link to comment Share on other sites More sharing options...
viper Posted December 26, 2012 Author Share Posted December 26, 2012 Iv just stuck on a toms ecu but i noticed the idle issue before. I not sure about a low redline although I did think it hit it quickly when I revved it yesterday stationary with the stock ecu. It's an Na with a TT conversion that came off an auto. Now with an r154, lightens flywheel stage 5 clutch, bpu. It drives fine just now and again as I drop from second to third it cuts out. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.