Cylinder 8 misfire
12-31-2009, 06:35 PM
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Cylinder 8 misfire I noticed the past few weeks that when it's cold and the car's been sitting for a while, like overnight, when I would start it up, it would run rough, then after I had driven for a little bit it would run normally. I also noticed that sometimes the SES light would come on. Well, it happened night a little while ago when I left and the light came on. I stopped at Autozone to get it scanned and the guy said there's a Cylinder 8 misfire. Where should I start the remedy?
01-05-2010, 11:52 AM
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The light was off for a few days, but it came back on this morning. The SES light started flashing. I was afraid the car was going to self-destruct. lol.
01-05-2010, 11:58 AM
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its most likely the coil pack, If you wana test it the cheap way just swap a coil pack and wire over from another cylinder then read the code again. if it still on cylinder 8 then a compresion/leakdown test will be needed
01-05-2010, 12:08 PM
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shouldnt be too hard, Dependning where cylinder 8 is on your motor. should just be 2 screws and plug it in. good to go if im not mistaken cylinder 8 is the last cylinder on the passanger side.
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!!!! What the heck happened there?
02-04-2010, 04:20 PM
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Okay. It came on the last couple of cold mornings. It was on this morning, but it went off earlier this afternoon. So, it's probably definitely the coil pack? I'll just replace it, probably get a used one depending on much a new one is.
02-04-2010, 05:14 PM
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I mean cars are leaner in colder weather. If it stays on that cylinder after you trade 2 coils it could be a injector maybe? if it dosnt get the fuel it wont ignite the fire.
process of elimitation
1- Trade 2 coils and see if it stays and make sure you keep plug wires on the same cylinder
2- If it stays on the same cylinder then trade plug wires
3- If its still on the same change the plug
4- After that if its still the same it maybe a injector
process of elimitation
1- Trade 2 coils and see if it stays and make sure you keep plug wires on the same cylinder
2- If it stays on the same cylinder then trade plug wires
3- If its still on the same change the plug
4- After that if its still the same it maybe a injector
Last edited by SIC LSX; 02-04-2010 at 05:20 PM.
02-22-2010, 04:55 PM
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if you replaced the coil plug and wire and nothing changed try just unpluging the injector on that cylinder when it is running like crap. when you unplug the injector if it dosent start running any diff then it the injector if i does run diffrent then its something else
02-22-2010, 06:17 PM
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if you replaced the coil plug and wire and nothing changed try just unpluging the injector on that cylinder when it is running like crap. when you unplug the injector if it dosent start running any diff then it the injector if i does run diffrent then its something else
How hard is it to change the injector?
02-22-2010, 07:19 PM
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5-10 mins! take off 4 10mm bolts to fuel rail and pop rail off and remove clip holding injector on and pop it out and pop new one back on. You could just trade injectors and see if it changes cylinders 
If it is I have a few sets of stock rails and injectors laying around.
75% of the time its s plug,wire,coil or a bad connection!
If it is I have a few sets of stock rails and injectors laying around.75% of the time its s plug,wire,coil or a bad connection!