Mulbers Posted April 4, 2014 Share Posted April 4, 2014 Afternoon, I've had my Z (2003 GT 69k) a month or two now and I have notice it has a missfire when at idle. Ever so slight, I can just feel it hiccup. I took a punt on an ebay special EML327 to try and find a fault code. Nothing came up. I don't know if that is because of the equipment and app (Dashcommand) though. I've also noticed when after having a spirited blast I can smell sulphur dioxide. Is this because of rich running, knackered CAT, the missfire or just how they smell when rather warm? I need to narrow these things down to find the fault. Any input would be greatly appreciated. All the best. Quote Link to comment Share on other sites More sharing options...
Ekona Posted April 4, 2014 Share Posted April 4, 2014 Check for possible exhaust leaks underneath, right from the manifold all the way back. That could well cause the smell, and it may be causing a hiccup that could be interpreted as a misfire. I only say that as it's very unlikely to get a misfire with no code, especially if it happens regularly enough for you to notice it. Quote Link to comment Share on other sites More sharing options...
GMballistic Posted April 4, 2014 Share Posted April 4, 2014 ^^ What he said. When my 350 was misfiring it through up the EML straight away. Traced it back to a faulty coil pack ~ replaced the coil pack, reset the ECU and happy days again. Quote Link to comment Share on other sites More sharing options...
cs2000 Posted April 5, 2014 Share Posted April 5, 2014 If you're pushing it hard you still shouldn't be able to smell the cats, the car behind you may very we'll be able too but not you. Quote Link to comment Share on other sites More sharing options...
rtbiscuit Posted April 5, 2014 Share Posted April 5, 2014 if you are getting a sensation that feels like a missfire but no fault code i would suggest looking to see if you have a vacuum leak somewhere. if you have an air leak after the MAF or on a Vacuum hose it can give a lumpy idle and not throw an error code. Quote Link to comment Share on other sites More sharing options...
Mulbers Posted April 25, 2014 Author Share Posted April 25, 2014 if you are getting a sensation that feels like a missfire but no fault code i would suggest looking to see if you have a vacuum leak somewhere. if you have an air leak after the MAF or on a Vacuum hose it can give a lumpy idle and not throw an error code. Thanks for the reply. I will check this out over the weekend. Quote Link to comment Share on other sites More sharing options...
M13KYF Posted April 25, 2014 Share Posted April 25, 2014 plenum leak possible, Quote Link to comment Share on other sites More sharing options...
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