alaing Posted February 6, 2009 Share Posted February 6, 2009 hi guys i have a jspec tt that has a missfire problem. I cant drive the car on the road yet as its still a project. I used to have a missfire at the top end of the rev range(just reving it from idle), i thought ok, must be coil clips sure enough some of the coils didnt even have clips on them just the metal connectors pushed onto the coils! So i replaced the spark plugs, the clips, spark plug boots and checked all the wiring for breaks, loose wires, made the metal connectors sit on the coil terminals tighter etc. I now seem to have a missfire in the bottom half of the rev range!! If you stamp on the accelerator it will miss really badly then pick up at about 2k and go all the way to the red line no problem, hold it there and it runs fine. On idle it with 'cough' every 20 sec or so. I took off the coil clips one at a time to try it narrow it down to a cylinder but although it misses on each cylinder when the clip is off it will still 'cough' every 20sec or so?! Like its missing on another cylinder aswell. But it does this every one you disconnect. As you can imagine its very fustrating as it was fine before everything was changed (on idle i mean). Any ideas would be a big help, i was thinking could it be to do with the idle control valve? Thanks for taking the time to read this. alain:) Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted February 6, 2009 Share Posted February 6, 2009 A slight miss on idle is common, and usually down to the ECU hunting up and down correcting the AFR which is normal, i have something similar which i am sure wasn't there a year ago, but i can find no cure. The part that worries me is you are repeatedly reeving to the red line with no engine load. Quote Link to comment Share on other sites More sharing options...
alaing Posted February 6, 2009 Author Share Posted February 6, 2009 Ive only reved it a couple of times just to check where the missfire problem begins and end. Ive drivin it up the driveway a couple of times and it just missfires on load, really badly so try not to do it much i dont think its to do with the AFR. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted February 6, 2009 Share Posted February 6, 2009 Do you know if its running very rich? have you checked for fault codes? if it under load then i would look at the igniter (if you have already checked plugs, coil packs, connectors etc) Have you checked to see if there are any leaks in the MAP sensor and FPR hoses etc? Quote Link to comment Share on other sites More sharing options...
alaing Posted February 6, 2009 Author Share Posted February 6, 2009 Doesnt look or smell rich, i dont have an AFR gauge so cant tell No fault code what so ever. Ill check the ignitor and for leaks tomorrow. Thanks for your time ricky. Quote Link to comment Share on other sites More sharing options...
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