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Showing results for tags 'cylinder misfire'.
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#7 Cylinder Misfire
T-Town-Z posted a topic in 2014-2018 Silverado & Sierra TroubleshootingI did a search here for it but came up empty. Last week, my Check Engine Light came on briefly while on the highway. Just before and after that I noticed a reduced lack of response to giving it more throttle. I had a local guy pull the CEL code and said it came up as #7 Cylinder Misfire. I'm at 55,000 miles and am off warranty. The truck is a '14 with a 5.3. Any suggestions, or thoughts how serious this may be ?
So I had the truck make some noise and start a p0302 code as well as stabilitrak and traction control lights flashing. I understand that those lights can happen from the cpu shutting them off because of the misfire for some reason, based on other posters I have read. What I did: Brake switch Cleaned MAF Spark Plugs and Wires Coil Injector Inspected for vacuum leaks Poured some treatment in the oil and did a oil change Several tanks of premium fuel treated with b12 or Seafoam Seafoam in the brake booster line Took off the valve cover and cleaned the push rods and tried to put in some b12 chemtool, gently oiled clean push rods and put everything back together. Still have a p0302 and still rough idle. The noise and feel of the rough idle drives me nuts as my truck is pretty nice and I love it. I am planning on a lifter swap, I already ordered a Hynes manual and am looking at the lifters here: http://www.autopartswarehouse.com/shop_parts/valve_lifter/gmc/sierra_1500.html?redirect=1. Anyone have any advice on this as I prepare to undertake it? How long does something like this take? As of now I am hoping the cam shaft is still in good enough shape as the truck just started the rough idle recently. Anything else I need to replace while I am there?
Alright for starters im new to this forum but I'm curious for answers. I have a 2003 Silverado ext cab Z71 LT it has the 5.3 vortec V8. About six months ago it had a cylinder misfire and I decided it had been a while for a plug and wire change and that it was most likely the culprit. Changed the plugs only, and the misfire went away. About two weeks after misfire came back went ahead and changed the wires to avail. Tested for spark and found that I had a bad coil so I changed it out. Misfire still there. Ran codes came back for a bad MAF sensor replaced the MAF sensor and it didn't changed. Ran codes again said I was pulling in to much air in both banks. Did some research and a smoke test, ultimately replaced the intake manifold gasket still have the Misfire ran for codes again came back as bad MAF sensor again had the one I put in replaced under warranty, still no change. Any ideas on what next? It's only misfiring on one cylinder cylinder two. And it's always been cylinder two. She has 255k miles on her and up until the cylinder misfire has run like a top the whole way. Any help or ideas would be great guys thanks in advance.