jevansio Posted July 11, 2008 Share Posted July 11, 2008 My Supe has a missfire from hell at the mo, sounds like a scooby with lairy cams. I'm trying to recall what I may have done before it started I one thing I did was remove the heatwrap from the manifold. Since doing this when I pull up I check under the hood & it's roasting. Could excessive heat cause an ignition problem (premature coilpack breakdown etc). Also my manifold is blowing slighty (where it bolts onto the head). Can this cause a missfire. Link to comment Share on other sites More sharing options...
Wez Posted July 11, 2008 Share Posted July 11, 2008 Excessive intake temps can cause det, depending on the ECU it can be setup so that it pulls timing which could feel like hesitation etc. Link to comment Share on other sites More sharing options...
jevansio Posted July 11, 2008 Author Share Posted July 11, 2008 Excessive intake temps can cause det, depending on the ECU it can be setup so that it pulls timing which could feel like hesitation etc. I don't think it's det, it sounds/feels like a proper miss, I'm going to swap my coilpacks with Michel to elliminate them 1st I think, typical, car has been running mint for ages, TOTB nears & it starts spitting it's dummy Link to comment Share on other sites More sharing options...
gaz1 Posted July 11, 2008 Share Posted July 11, 2008 too much heat will cause problems with the coil pack clips unless you have replaced them lately, as they do become brittle with age /heat Link to comment Share on other sites More sharing options...
jevansio Posted July 11, 2008 Author Share Posted July 11, 2008 too much heat will cause problems with the coil pack clips unless you have replaced them lately, as they do become brittle with age /heat Just replaced them, they're all brand new Link to comment Share on other sites More sharing options...
Gaz6002 Posted July 11, 2008 Share Posted July 11, 2008 I'm fairly sure heat killed 2 of mine in Germany racing a pair of RS6s at 180... it was one of the hottest days of the year and my car first developed a miss before 1, then 2 cylinders stopped firing altogether. The car was fine up until this point. Link to comment Share on other sites More sharing options...
jevansio Posted July 11, 2008 Author Share Posted July 11, 2008 I'm fairly sure heat killed 2 of mine in Germany racing a pair of RS6s at 180... it was one of the hottest days of the year and my car first developed a miss before 1, then 2 cylinders stopped firing altogether. The car was fine up until this point. What I'm worried about is diagnosing the problem to be the coilpacks, shelling out £400 on new ones (before I get my manifold wrapped) and the same thing happening, that's if it is the heat that has caused the missfire. My car has been running fine for ages (engine wise) before this Link to comment Share on other sites More sharing options...
SteveR Posted July 11, 2008 Share Posted July 11, 2008 Ian R had similar sounding issues on his previous single when we were on the way to the 'Ring 2 years ago. The car was fine when cold, but after a blast and then sitting in traffic/slow roads the theory was that there wasn't enough airflow to keep the underbonnet temps down and I think it was old coilpacks that were suffering as a result. Ian had it all diagnosed when we got back hence I'm not 100% sure. IIRC the car was fine being thrashed at high speeds, it was mainly afterwards when pootling that it had issues. Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 11, 2008 Share Posted July 11, 2008 Logically, i wouldn't thought it would be a heat issue, unless your seeing high oil and water temps as well, the coil paks could just be suffering from old age/weakness, as they are designed to withstand high temps, or they wouldn't have used individual coil on plug set up;) Link to comment Share on other sites More sharing options...
johnny g Posted July 11, 2008 Share Posted July 11, 2008 What I'm worried about is diagnosing the problem to be the coilpacks, shelling out £400 on new ones (before I get my manifold wrapped) and the same thing happening, that's if it is the heat that has caused the missfire. My car has been running fine for ages (engine wise) before this Would something like a TRD bonnet help you there Jay? Could be beneficial in getting the heat out? Link to comment Share on other sites More sharing options...
Jazzy Posted July 11, 2008 Share Posted July 11, 2008 Sounds familar, my AEM had been playing up as one of the pin connectors to it was slightly loose. So I could get a week of flawless driving and then all of a sudden or sorts of odd things would happen. One such thing with a huge misfire that sounded like a Scooby on wild cams. Until Ryan found what was causing all these problems, I always managed to 'sort' them by pulling the ECU fuses out for a few secs, maybe worth a go. Link to comment Share on other sites More sharing options...
jevansio Posted July 11, 2008 Author Share Posted July 11, 2008 I like the UK scoop at the mo, so don't really want to change my bonnet Johnny. Sounds like old age then, a brand new set may be the only answer I guess. We'll see if it goes when I swap them over Link to comment Share on other sites More sharing options...
jevansio Posted July 13, 2008 Author Share Posted July 13, 2008 Well I've sorted the missfire, turned out that I went along each of the coilpacks & pushed the pin down so it would make a better contact, it went straight away, been out boosting @ 1.6 BAR & not a sign But just as I shouted yippie, a big swoosh & I lost all boost, sounds like a pipe has popped off, I had a quick look & couldn't see anything obvious, I guess I'll have to go over each joint one at a time. Do problems ever end on these cars Link to comment Share on other sites More sharing options...
SteveR Posted July 13, 2008 Share Posted July 13, 2008 lol, 2 steps forward, 1 back. At least problem 1 was an easy fix and problem 2 is an easy diagnosis (and hopefully, fix). Link to comment Share on other sites More sharing options...
jevansio Posted July 13, 2008 Author Share Posted July 13, 2008 I had a good look again & couldn't see any loose clips or splits so I decided to take the plunge & remove the front bumper & entire FMIC & piping (it gave me the chance to remove the AC condenser aswell). Checked the FMIC 1st, no leaks, then the FMIC to throttle pipes, again no leaks, then the compressor to FMIC, 1 massive leak (see attached). So at least I've found it & the car is running well Link to comment Share on other sites More sharing options...
AndyT Posted July 13, 2008 Share Posted July 13, 2008 Nice one J. That is a large hole. Link to comment Share on other sites More sharing options...
Ryan.G Posted July 13, 2008 Share Posted July 13, 2008 Great to see you getting involved Jay and enjoying it. Sorry couldn't see you today but im glad you sorted it. Ryan Link to comment Share on other sites More sharing options...
jevansio Posted July 13, 2008 Author Share Posted July 13, 2008 Nice one J. That is a large hole. Cheers Andy, you should have seen me & my mate checking the pipework, we each had one end over our mouths & were blowing as hard as we could, people must have thought we were nuts Oh to test the FMIC I filled it with water, I'm letting it drain overnight, is there anything I should be concerned about after filling it with water? Link to comment Share on other sites More sharing options...
jevansio Posted July 13, 2008 Author Share Posted July 13, 2008 Great to see you getting involved Jay and enjoying it. Sorry couldn't see you today but im glad you sorted it. Ryan Cheers Ryan, yeah I had a lot on today, fixing the Supe, finishing decking out the back, plus loads of other stuff, will catch you next time Link to comment Share on other sites More sharing options...
AndyT Posted July 13, 2008 Share Posted July 13, 2008 Cheers Andy, you should have seen me & my mate checking the pipework, we each had one end over our mouths & were blowing as hard as we could, people must have thought we were nuts Oh to test the FMIC I filled it with water, I'm letting it drain overnight, is there anything I should be concerned about after filling it with water? Just let it dry completely mate. Got a great image in my head of you two blowing through pipes. Link to comment Share on other sites More sharing options...
jevansio Posted July 13, 2008 Author Share Posted July 13, 2008 Just let it dry completely mate. Got a great image in my head of you two blowing through pipes. Will do, it'll be a day or 2 before it goes back on anyway Link to comment Share on other sites More sharing options...
Ryan.G Posted July 13, 2008 Share Posted July 13, 2008 Will do, it'll be a day or 2 before it goes back on anyway Why not put a proper intercooler in there now while its out Link to comment Share on other sites More sharing options...
jevansio Posted July 13, 2008 Author Share Posted July 13, 2008 Why not put a proper intercooler in there now while its out I may do, 4-Row should be here shortly, also my new CF front lip will be easier to fit now the front bumper is off, so all things point to me waiting till the weekend. Trouble with that is that's 1 week of driving (test time) before TOTB which. I don't really want to have a load of stuff wacked on the car unproven "just" before TOTB Link to comment Share on other sites More sharing options...
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