Cylinder Misfire
#1
Cylinder Misfire
Hey guys,
I went mudding yesterday, came home and did some light cleaning of the engine bay. I didnt soak anything in there, and I stayed away from the intake, electronics and the alternator. I took it for a ride when I was done, no problems, and brought it here to work today with no problems (about a 10 mile drive). I went to go to lunch today, and about 3 miles down the road I noticed a little blip in the smoothness in the engine a couple times. So off the next light, I gave it a little gas to see whats going on, and the engine light started blinking after it shifted out of first gear. It then ran like crap. It idles rough and doesnt ride smooth going down the road. Im getting a cylinder 8 misfire. For your viewing pleasure:
47lfo.gif
I just replaced the plugs with 3923s less than 100 miles ago. I highly doubt the plug has fouled in cylinder 8, and since it is so far back Im hoping I just didnt tighten it all the way and it just wobbled loose. What are the chances its just a loose plug?
Ive looked up on google what can cause a misfire, and they brought up vacuum leaks. I did just replace the TB, so its a possibility. What are the chances that it would just make one cylinder misfire though if there was a vacuum leak?
Like I said, it ran completly fine until today at lunch. So I think its safe to rule out the water, but what are your guy's thoughts?
I went mudding yesterday, came home and did some light cleaning of the engine bay. I didnt soak anything in there, and I stayed away from the intake, electronics and the alternator. I took it for a ride when I was done, no problems, and brought it here to work today with no problems (about a 10 mile drive). I went to go to lunch today, and about 3 miles down the road I noticed a little blip in the smoothness in the engine a couple times. So off the next light, I gave it a little gas to see whats going on, and the engine light started blinking after it shifted out of first gear. It then ran like crap. It idles rough and doesnt ride smooth going down the road. Im getting a cylinder 8 misfire. For your viewing pleasure:
47lfo.gif
I just replaced the plugs with 3923s less than 100 miles ago. I highly doubt the plug has fouled in cylinder 8, and since it is so far back Im hoping I just didnt tighten it all the way and it just wobbled loose. What are the chances its just a loose plug?
Ive looked up on google what can cause a misfire, and they brought up vacuum leaks. I did just replace the TB, so its a possibility. What are the chances that it would just make one cylinder misfire though if there was a vacuum leak?
Like I said, it ran completly fine until today at lunch. So I think its safe to rule out the water, but what are your guy's thoughts?
#3
#5
#6
Are you running any type of aggressive tuning on Superchips or SCT? Our coils arent the best at dealing with the aggressive pull of the vacuum system. This happens to be from time to time.
Check your #8 coil connection as well as the fuel injector for that cylinder. If the connections are wet, they may not transfer the signal effeciently.
If the fuel injector is not spraying, you can get the same. If you get air into the fuel rail it can cause this also.
Check your #8 coil connection as well as the fuel injector for that cylinder. If the connections are wet, they may not transfer the signal effeciently.
If the fuel injector is not spraying, you can get the same. If you get air into the fuel rail it can cause this also.
#7
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#10
It certainly could, but when the fuel system is charged it can move. If its air in the line, simply put a rag under the relief valve on the rail and slowly press in. If its air it will bleed out, if there isn't air in the sytem you will just get fuel.