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Showing results for tags 'misfiring'.
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2005 GMC Yukon runs terrible
Anthony Jay Burt posted a question in Ask the GM TechnicianMy GMC Yukon 05 model 5.3L was given to me by a friend because I had recently wrecked my 15 Silverado. I knew and he knew as well that the Yukon wasn't running very good. It would fire right up but it would idle as if out of time or something was stopped up. We put a scanner on it and we had so many codes pop up. the knock sensor code was the first one I tackled by replacing both knock sensors. replaced the intake gasket. I have put a new mass air flow sensor on it and plugs and plug wires. after putting everything back together I cranked back up and it was running worst. clear the codes hooked it back up to the reader and had these 2 codes pop up. P0101(MASS AIR FLOW) even after replacing the old with the new . P0449(EVAPORATIVE SILONOID) I'VE GOT A BRAND NEW ONE BUT HAVEN'T REPLACED IT. what should I do from here need help please point me in the right direction. What should I do next?
99 GMC Sierra 2500 6.0L 2wd misfiring
MRbam444 posted a topic in 1999-2013 Silverado & Sierra 1500Truck is a 99 GMC Sierra 2500 extended cab 6.0L rear wheel drive about a year old with me and has about 260,000 Mods: true dual straight pipe with cats New ac delco spark plugs gapped at 0.062 MSD street fire spark plugs at 8 mm Any how one day was cruising and got a soda and started it up and noticed it was running on 3-6 cylinders pumped the gas a bit and all 8 came back coil packs are all sparking to the wire and all the connectors are delivering power 12v Need help with this ASAP next parts to replace will be performance coil packs then the injectors codes where p0300-random misfire detected P0102-maf sensor circuit low frequency P0332-knock sensor 2 circuit low input (bank2) x2 Autozone code summary says replace all valve springs and bad valve springs will cause popping and misfire but it misfires when I start it and put it in gear and only for a minute or so until I hammer down and get all 8 back running this is a very dangerous problem for me since it's my only vehicle and I have 2 children