alaing Posted February 18, 2009 Share Posted February 18, 2009 Looking for some help with my supras missfire problem can anyone in essex come and help? Im in braintree? thanks alain:) Quote Link to comment Share on other sites More sharing options...
JustGav Posted February 18, 2009 Share Posted February 18, 2009 NA or TT? Quote Link to comment Share on other sites More sharing options...
alaing Posted February 18, 2009 Author Share Posted February 18, 2009 Sorry. Yeh some info would help. It a j-spec tt. totally standard, its not on the road yet either thanks. Quote Link to comment Share on other sites More sharing options...
tonyhawk Posted February 18, 2009 Share Posted February 18, 2009 I'm in Chelmsford; I'm happy to help if I can? Quote Link to comment Share on other sites More sharing options...
JustGav Posted February 18, 2009 Share Posted February 18, 2009 Sorry. Yeh some info would help. It a j-spec tt. totally standard, its not on the road yet either thanks. First call is usually the coil pack connectors and wiring as well as checking the error codes. That said without a lot more information, it could be a multitude of things. Could be some pins loose on the ECU connector...could be lots....Can you describe it a bit more? Quote Link to comment Share on other sites More sharing options...
AlexM Posted February 18, 2009 Share Posted February 18, 2009 I'm in Chelmsford; I'm happy to help if I can? Where abouts in Chelmsford are you? I'll keep an eye out when I'm there. Quote Link to comment Share on other sites More sharing options...
alaing Posted February 18, 2009 Author Share Posted February 18, 2009 I used to have a missfire at the top end of the rev range, 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. On idle it will '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 on 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. alain Quote Link to comment Share on other sites More sharing options...
alaing Posted February 18, 2009 Author Share Posted February 18, 2009 oh no fault codes what so ever either. Quote Link to comment Share on other sites More sharing options...
tonyhawk Posted February 18, 2009 Share Posted February 18, 2009 Is the cough regular or every now and again? Quote Link to comment Share on other sites More sharing options...
alaing Posted February 18, 2009 Author Share Posted February 18, 2009 It tends to be every now and then, If you crack the throttle open hard it just misses really bad but it you open it really slowly it doesnt miss. thanks Quote Link to comment Share on other sites More sharing options...
hadyn Posted February 18, 2009 Share Posted February 18, 2009 Sounds like you've got the wrong grade of spark plugs mate - are you running higher than stock levels of boost, BPU etc? Quote Link to comment Share on other sites More sharing options...
alaing Posted February 18, 2009 Author Share Posted February 18, 2009 Its tottally standard. Its got a set of brand new NGK BKR6EIX s in it. Do you think i should try a smaller gap on them? Quote Link to comment Share on other sites More sharing options...
tonyhawk Posted February 18, 2009 Share Posted February 18, 2009 Just out of curiosity, if the coil wires were just pressed in, were they in the right way around? I had the same problem a few years ago; the plug will still fire, but it will give you a miss fire under pressure. Quote Link to comment Share on other sites More sharing options...
alaing Posted February 18, 2009 Author Share Posted February 18, 2009 Hmm not sure about that tony? do you know which way round they should be? thanks. Quote Link to comment Share on other sites More sharing options...
tonyhawk Posted February 18, 2009 Share Posted February 18, 2009 From memory I think the blue wire goes on the left as you look at the back of the plug, and the common earth (black and orange?) goes on the right. I think ... Quote Link to comment Share on other sites More sharing options...
tonyhawk Posted February 18, 2009 Share Posted February 18, 2009 Sorry, I meant blue rubber sorround, not wire! Quote Link to comment Share on other sites More sharing options...
alaing Posted February 18, 2009 Author Share Posted February 18, 2009 well if your right mine is the correct way round then. Quote Link to comment Share on other sites More sharing options...
tonyhawk Posted February 18, 2009 Share Posted February 18, 2009 Here's the diagram of the coils; the orange and black wire goes in the right and the coloured one goes in the left (I think) Quote Link to comment Share on other sites More sharing options...
tonyhawk Posted February 18, 2009 Share Posted February 18, 2009 Oh Quote Link to comment Share on other sites More sharing options...
alaing Posted February 18, 2009 Author Share Posted February 18, 2009 Its frustrating! The coil apper to be firing ok as like i said you can take a clip off one at a time and it misses properly on that cylinder. Could a stuck air valve ( one of the vsvs) cause a missfire problem? Quote Link to comment Share on other sites More sharing options...
tonyhawk Posted February 18, 2009 Share Posted February 18, 2009 If you've removed one coil at at time, and the cough still occurs, then perhaps fuelling? Could it be the O2 sensor? I know that they can get clogged up and thus false readings, but I'm not sure if that would make more trouble than you have? If it's bogging down with quick throttle opening, it sounds like not enough fuel? Hmmm... Quote Link to comment Share on other sites More sharing options...
tonyhawk Posted February 18, 2009 Share Posted February 18, 2009 Does it only happen on boost? Quote Link to comment Share on other sites More sharing options...
tonyhawk Posted February 18, 2009 Share Posted February 18, 2009 The VSV's control the wastegate and the sequential system, so I wouldn't have thought so if it's coughing at idle. Blocked injector? Quote Link to comment Share on other sites More sharing options...
alaing Posted February 18, 2009 Author Share Posted February 18, 2009 Yeh i thought blocked fuel filter but i changed that, im not ruling out fuel though. I need to get my hands on a fuel pressure tester. Quote Link to comment Share on other sites More sharing options...
tonyhawk Posted February 18, 2009 Share Posted February 18, 2009 I have a set of J-Spec injectors you can have if you want to test them? Quote Link to comment Share on other sites More sharing options...
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