MUZ580 Member 448 Member For: 18y 18d Gender: Male Location: Manly - Sydney Posted 23/08/06 12:27 AM Share Posted 23/08/06 12:27 AM Just got a call from my dad who is driving my car at the moment. He just went to start the car to go for a drive and it is running like a pig. Wont start every time and when it does its backfiring and missing and wont idle at all. When he revs it, LOTS of black smoke is coming out the exhaust. I replaced the battery on Saturday as it was dead and it ran really well all day. He hasnt driven it since. I cant think of what it could be? I installed a Kompact BOV and Typhoon IC about 2 months ago and thought it might be a hose that's come off and leaking boost, but Dad says all looks ok. You can see my other mods from my signature. (the Cat and the EDIT havent been put on yet) Anyone had this problem before, or know possibly what it could be.I wont be able to get out till the weekend to have a look at it, but if its something simple Dad might be able to fix it himself. Link to comment Share on other sites More sharing options...
Paradoxx Colossal Member Member 5,049 Member For: 19y 7m 23d Gender: Male Location: Perth, WA Posted 23/08/06 12:31 AM Share Posted 23/08/06 12:31 AM Black smoke is too much fuel going in. What about a re-flash? Link to comment Share on other sites More sharing options...
Guest newl Guests Posted 23/08/06 03:19 AM Share Posted 23/08/06 03:19 AM Reflash shouldn't be an issue:the Cat and the EDIT havent been put on yet Link to comment Share on other sites More sharing options...
MUZ580 Member 448 Member For: 18y 18d Gender: Male Location: Manly - Sydney Posted 23/08/06 03:19 AM Author Share Posted 23/08/06 03:19 AM Had the PCM re-flashed last service, but that was ages ago and its been running fine. At first the unichip didnt like it but it got better with time. I've got an EDIT waiting to be put on in the next few weeks, so hopefully if I cant fix it myself any time soon the Tune or tuner will fix it. Link to comment Share on other sites More sharing options...
Paradoxx Colossal Member Member 5,049 Member For: 19y 7m 23d Gender: Male Location: Perth, WA Posted 23/08/06 03:32 AM Share Posted 23/08/06 03:32 AM If something was faulty my best guess is O2 sensor... if this is reading wrong it will try and dump more fuel in to compensate for what it "thinks" is a lean running engine. Alternatively the unichip might be throwing it all out of whack.Other things to check are injectors - are they squirting correctly or leaking into the chamber? ummm would busted valve springs cause these symptoms? Link to comment Share on other sites More sharing options...
RAPHOON Donating Members 1,776 Member For: 20y 9m 20d Posted 23/08/06 03:42 AM Share Posted 23/08/06 03:42 AM Another option is the Unichip.Maybe it's not "bending" the signal correctly right now and the ECU is supplying too much fuel via the bigger injectors.Same as when you have the ECU flashed by FoMoCo. You should always consider a touch up on a Unichip afterwards, as the base settings it is "bending" may have changed. Link to comment Share on other sites More sharing options...
2fardown Member 526 Member For: 18y 11m 4d Gender: Male Location: Brisbane Posted 23/08/06 06:11 AM Share Posted 23/08/06 06:11 AM Get rid of the unichip. Problem solved. Link to comment Share on other sites More sharing options...
MUZ580 Member 448 Member For: 18y 18d Gender: Male Location: Manly - Sydney Posted 23/08/06 06:25 AM Author Share Posted 23/08/06 06:25 AM Another option is the Unichip.Maybe it's not "bending" the signal correctly right now and the ECU is supplying too much fuel via the bigger injectors.←Get rid of the unichip. Problem solved.←If it was the unichip, why would it stop working all of a sudden. It was fine on the weekend, today not fine. Sounds to me more like a hose has come off and its leaking boost, the car cant process the fuel and its running rough. Link to comment Share on other sites More sharing options...
Paradoxx Colossal Member Member 5,049 Member For: 19y 7m 23d Gender: Male Location: Perth, WA Posted 23/08/06 06:38 AM Share Posted 23/08/06 06:38 AM Yeh I dont think its the unichip... it would have done this right from when u got it back.From my experience with my own car, when the valve springs dont play the game the car runs like for a short time and there is black smoke under load. If a valve spring fails altogether it will not get better and might cause a problem with the valve being struck by the piston. When mine goes normal operation comes back within a few seconds... If a hose has come off it could cause rough idle and poor running. Have a good look at all the vaccuum/boost lines etc. Another thing to consider is, is the unichip doing the job at all? If it isnt changing the signals, the stock ecu will be putting out its own signals and with bigger injectors this would mean WAY too much fuel is going in. Link to comment Share on other sites More sharing options...
2fardown Member 526 Member For: 18y 11m 4d Gender: Male Location: Brisbane Posted 23/08/06 07:44 AM Share Posted 23/08/06 07:44 AM If it's a plug-in type uni-chip why not take it out of the equation? Link to comment Share on other sites More sharing options...
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