Stu-R Posted May 25, 2012 Share Posted May 25, 2012 Alright finaly got my supra running again and took it for a spin. First couple of pulls were fine but then on the second turbo its started missfiring and its getting worse. it had new ngk iridium plugs and coil pack clips only a couple hundred miles ago. It bassicaly sounds like a small child spraying an ak47 when after around 5000rpm any ideas what could cause this? Quote Link to comment Share on other sites More sharing options...
Supra-duper Posted May 25, 2012 Share Posted May 25, 2012 Have you torqued down the new plugs correctly? Quote Link to comment Share on other sites More sharing options...
Stu-R Posted May 25, 2012 Author Share Posted May 25, 2012 It was done by a garage but the car worked fine before so i pressume they were fine Quote Link to comment Share on other sites More sharing options...
Nic Posted May 25, 2012 Share Posted May 25, 2012 (edited) What boost is it running? Missing at high boost levels is usually caused by either poor coil pack wiring connectors or worn/wrong heat range plugs. I'd start by double checking the connectors to the coil packs are all secure and that you've got the correct heat range plugs fitted http://www.mkivsupra.net/vbb/showthread.php?41927-FAQ-Spark-plugs&highlight=spark You could also try pulling the plugs to see if one or more of the electrodes looks different to the others which could narrow down the problem to a specific cylinder. Edited May 25, 2012 by Nic (see edit history) Quote Link to comment Share on other sites More sharing options...
Stu-R Posted May 25, 2012 Author Share Posted May 25, 2012 its running 1.1 bar ill try that tomorrow and see how they look cheers Quote Link to comment Share on other sites More sharing options...
Stu-R Posted May 26, 2012 Author Share Posted May 26, 2012 Think I've found the problem. Today my power steering started making a grinding noise and a bit of googling reveals it could be the crank pulley. Going to put a new one on and see if it makes a difference Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted May 26, 2012 Share Posted May 26, 2012 That won't cause a missfire. How old are the coil packs? Quote Link to comment Share on other sites More sharing options...
Stu-R Posted May 26, 2012 Author Share Posted May 26, 2012 I presume they've never been changed, the car was imported in January and it didn't come with much from japan Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted May 26, 2012 Share Posted May 26, 2012 Well there's your problem if the plugs and clips are new of course. 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.