Random miss fire...help plz!!!
Thread Starter
TECH Resident
Joined: Jan 2004
Posts: 960
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From: Vacaville CA
Random miss fire...help plz!!! I have a random misfire code and did the normal checks like wires and plugs which are good. I have new injecters and coil packs as well so im sure it can be them... a buddy said maybe a crank sensor or cam sensor??? any advice would be very helpful thx.
David
David
Last edited by ZeeSNuttS; Sep 16, 2009 at 01:50 PM.
A failing Crank Shaft Position sensor can certainly cause misfires and all kinds of other very weird **** to happen. You won't get an SES light until it totally fails either.
Go buy one and pop it in...if its not it take it back for a refund.
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Go buy one and pop it in...if its not it take it back for a refund.
.
I know you said you checked the sprak plug wires. But make double sure both ends are "snapped" into place on the plug and coil.
Also, could be a cracked spark plug. Leaky fuel injector.
Make sure that none of the spark plug wires are touching the exhaust manifold pipes....that will give you a misfire, especially at mid-higher rpms.
.
Also, could be a cracked spark plug. Leaky fuel injector.
Make sure that none of the spark plug wires are touching the exhaust manifold pipes....that will give you a misfire, especially at mid-higher rpms.
.
Thread Starter
TECH Resident
Joined: Jan 2004
Posts: 960
Likes: 1
From: Vacaville CA
what other weird **** because my rpm gauge some times doesn't work
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Thread Starter
TECH Resident
Joined: Jan 2004
Posts: 960
Likes: 1
From: Vacaville CA
i had all the wires and plugs off i should of just replaced the plugs. They looked fine so I put them back in only a few month old. NGK
btw I have a new timing chain on there so less likely its that...
btw I have a new timing chain on there so less likely its that...
Make sure the ground on your alternator is secure. Also check the positive lead that runs to your fuse box under the hood. If either of these is loose, it can cause the issues you are explaining.
One more thing, since you have changed the injectors.....I had this issue myself....the injector wiring was actually broken inside the insulation. This was causing intermittent misfires on 3 of my cylinders. The only way you can diagnose this is with a multimeter. You have to check for continuity from the injector plug back to the PCM.
One more thing, since you have changed the injectors.....I had this issue myself....the injector wiring was actually broken inside the insulation. This was causing intermittent misfires on 3 of my cylinders. The only way you can diagnose this is with a multimeter. You have to check for continuity from the injector plug back to the PCM.
Thread Starter
TECH Resident
Joined: Jan 2004
Posts: 960
Likes: 1
From: Vacaville CA
Make sure the ground on your alternator is secure. Also check the positive lead that runs to your fuse box under the hood. If either of these is loose, it can cause the issues you are explaining.
One more thing, since you have changed the injectors.....I had this issue myself....the injector wiring was actually broken inside the insulation. This was causing intermittent misfires on 3 of my cylinders. The only way you can diagnose this is with a multimeter. You have to check for continuity from the injector plug back to the PCM.
One more thing, since you have changed the injectors.....I had this issue myself....the injector wiring was actually broken inside the insulation. This was causing intermittent misfires on 3 of my cylinders. The only way you can diagnose this is with a multimeter. You have to check for continuity from the injector plug back to the PCM.
