leelbuk Posted May 10, 2007 Share Posted May 10, 2007 Hello people - fitted my plugs to the car a couple of weekends ago and turned up the boost to 1.2bar for the 1st time and all I can say is :d WOW!!! :d Like I've put another turbo on!! Only trouble is since then I have a mysterious starting problem. If I come to the car in the morning and turn the key she will turn over and then just start for half a second and cut out. This will happen the next 2/3 times I try too and then the next time she will start and run perfect. I have checked I have put everything back correctly and I have even replaced one of the coil connectors that was looking a bit 'dodgy' - all the others seem fine. All plugs seem to be firing fine - the car runs better than it did with the standard NGKs in there - i'e not a miss or anything - she purrs lovely even when whe revs down - no popping or nothing and is perfect under boost and load. Is there anything else I can check? I can see a vacuum line that has a small crack in it which I will be replacing on the weekend - could this cause problems? I have no idle problems or anything, just problem on cold start. Any help would be great. Regards, Lee. Quote Link to comment Share on other sites More sharing options...
bignum Posted May 10, 2007 Share Posted May 10, 2007 Hi mate, sounds like plug gaps, i know your not supposed to adjust iridiums but if one has been knocked it can cause problems Quote Link to comment Share on other sites More sharing options...
leelbuk Posted May 10, 2007 Author Share Posted May 10, 2007 Really?? Thats a bugger and they cost a fair bit too - how likely am I to damage them if I try and adjust them? Whats the gap supposed to be? Wouldn't they cause the car to miss slightly or suffer under load? It just seems odd as the plugs are definately better as mine used to pop a little when reving down and also occasionally miss on idle. Quote Link to comment Share on other sites More sharing options...
bignum Posted May 10, 2007 Share Posted May 10, 2007 Theres loads of info on plugs in the faq page, have a butchers. http://www.mkivsupra.net/vbb/showthread.php?t=41927 Quote Link to comment Share on other sites More sharing options...
leelbuk Posted May 10, 2007 Author Share Posted May 10, 2007 Doh! Where's my manners - spoke before I . Cheers though!! Quote Link to comment Share on other sites More sharing options...
edge Posted May 10, 2007 Share Posted May 10, 2007 Yeah dont try and adjust them lee. If it does turn out to be a plug the try http://www.sparkplugs.co.uk Quote Link to comment Share on other sites More sharing options...
Homer Posted May 10, 2007 Share Posted May 10, 2007 It's almost as though the plugs are too cold, are you sure you were supplied with IK24's and not something colder? You should really have IK22's with BPU anyway. As an easy troubleshooting step, get yourself some NGK BCPR7ES plugs and gap them to 0.85mm (they're less than £15 a set) and see if the problems continue. Quote Link to comment Share on other sites More sharing options...
leelbuk Posted September 1, 2007 Author Share Posted September 1, 2007 Cheers for your help guys - I have tried changing them all to known working platinum plugs (the ones I took out of the car were all perfectly fine and only covered ~5000 miles) My problem has worsened and is a tad confusing. If I turn the keys, starter motor cranks but the engine doesn;t fire and just keeps turning forever. BUT if I turn of the ignituion, switch back on she almost catches and everytime I switch off and on (needs about 5 times) it gradually gets closer to starting and eventually fires up - car runs fine on full boost, under load etc but on idle she is missing often (not rhythmic - makes car vibrate when missing). From searching the forum it could be coil packs, but why would this get easier to start everytime I switch off the ignition? I could be missing something obvious that some of you supra Guru's out there might know/common fault etc. Please help! I have no idea how to diagnose this! Thanks in advance! Quote Link to comment Share on other sites More sharing options...
SUPRASUZUKI Posted September 1, 2007 Share Posted September 1, 2007 Check your FCD wiring. I had a similar issue. Turned out I'd wired my FCD into a feed that went 'dead' while the engine was cranking. Sometimes it started ok, sometimes not. Quote Link to comment Share on other sites More sharing options...
Kranz Posted September 1, 2007 Share Posted September 1, 2007 Coil pack connectors??? How were they when the plugs were changed? You say they looked fine, did you re-tension them to ensure they still contact? 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.