Beyond Severe Misfire...not coils?
#1
Beyond Severe Misfire...not coils?
Well, I have a 99 max. That in itself should explain alot. Well anyway, car is misfiring horribly. Car is shaking very noticably at stops, and during even light acceleration, the car sounds like a old, beaten V8. Not to mention there is an extreme loss of power. During heavier acceleration, I can noticably feel when they all fire, and when they dont. Anyway, I've pulled the coils while the car was running, and they all give a noticably change over the rough idle. My exactly question is, what other than an ignition coil could cause a miss this bad?
BTW: I had the SES light checked, and it's not a cylinder 3 misfire (where it was cylinder 1 a few months ago) and a bad o2 sensor. Could the o2 sensor have something to do with it?
BTW: I had the SES light checked, and it's not a cylinder 3 misfire (where it was cylinder 1 a few months ago) and a bad o2 sensor. Could the o2 sensor have something to do with it?
#2
I don't know the tune up history of your car but when was the last time you changed your plugs? How many miles are on the car? When last did you change your fuel filter? Other than that I'm thinking engine internals or a feul pressure problem.
#3
I have a 95 and mine does something similiar. It misfires at stop. Seems to get worse the hotter the temperature outside becomes. I doesn't misfire very bad while driving although I can feel some hesitation when accelerating at a constant rate. I haven't changed the plugs since I've had the car so that will be my next option. Also I had the CEL come on today which I believe is the KS and an o2.
Why can't cars just be made simple?
WES
Why can't cars just be made simple?
WES
#5
Be Careful
I have a 96 GLE. A few weeks ago, right after I filled my tank, I started getting a misfire on the 6th cylinder. I was trying dry gas, etc to clean it out. I am guessing that the spark plug was loose, because I ended up shooting the spark plug right out of the engine! Needless to say, it stripped the threads and destroyed the coil. I am currently trying to fix the stripped threads. (Any tips or suggestions welcome!)
In addition to everything else, you may want to check to be sure the spark plug isn't loose.
In addition to everything else, you may want to check to be sure the spark plug isn't loose.
#7
Originally Posted by robsst
I have a 96 GLE. A few weeks ago, right after I filled my tank, I started getting a misfire on the 6th cylinder. I was trying dry gas, etc to clean it out. I am guessing that the spark plug was loose, because I ended up shooting the spark plug right out of the engine! Needless to say, it stripped the threads and destroyed the coil. I am currently trying to fix the stripped threads. (Any tips or suggestions welcome!)
In addition to everything else, you may want to check to be sure the spark plug isn't loose.
In addition to everything else, you may want to check to be sure the spark plug isn't loose.
#9
http://www.jatan.net/tsbs/056841.pdf
I have a '99 that had severe misfire problems that were not coil related. After checking every sensor known to man, and everything else too, it turned out to be a broken wire in the harness leading to one of the injectors. There is a technical service bulletin about this, so I think it was a common problem with our cars. Start your car, put on the emergency brake, and put it in drive. Then start pulling and bending the harness. If it is a wire in the harness, and there is an intermitant connection, you will hear the missfire. Good luck......
I have a '99 that had severe misfire problems that were not coil related. After checking every sensor known to man, and everything else too, it turned out to be a broken wire in the harness leading to one of the injectors. There is a technical service bulletin about this, so I think it was a common problem with our cars. Start your car, put on the emergency brake, and put it in drive. Then start pulling and bending the harness. If it is a wire in the harness, and there is an intermitant connection, you will hear the missfire. Good luck......
#10
Originally Posted by sdoherty_tjm
if it was stripped then re-threaded, the size wont be the same as it was before.
Edit... I just read you just screw in a heli-coil.
#11
Originally Posted by salz
http://www.jatan.net/tsbs/056841.pdf
I have a '99 that had severe misfire problems that were not coil related. After checking every sensor known to man, and everything else too, it turned out to be a broken wire in the harness leading to one of the injectors. There is a technical service bulletin about this, so I think it was a common problem with our cars. Start your car, put on the emergency brake, and put it in drive. Then start pulling and bending the harness. If it is a wire in the harness, and there is an intermitant connection, you will hear the missfire. Good luck......
I have a '99 that had severe misfire problems that were not coil related. After checking every sensor known to man, and everything else too, it turned out to be a broken wire in the harness leading to one of the injectors. There is a technical service bulletin about this, so I think it was a common problem with our cars. Start your car, put on the emergency brake, and put it in drive. Then start pulling and bending the harness. If it is a wire in the harness, and there is an intermitant connection, you will hear the missfire. Good luck......
#12
most likely your injectors. dont try swapping it out. i highly recommend using injector cleaner first then if the problem persists, it may be compression leak so take it to a mechanic or the dealer.
#13
Originally Posted by JwaxMax99
There is a special tool just for fixing that problem. It re-threads hole and a with a vaccum adapter it suck the debris out of hole.
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