Random miss fire...help plz!!!
09-15-2009, 04:24 PM
#1
TECH Resident
Thread Starter
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; 09-16-2009 at 01:50 PM.
09-15-2009, 05:24 PM
#3
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.
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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.
.
09-15-2009, 08:06 PM
#6
TECH Resident
Thread Starter
what other weird **** because my rpm gauge some times doesn't work
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09-16-2009, 01:56 PM
#12
TECH Resident
Thread Starter
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...
09-16-2009, 11:55 PM
#13
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.
09-17-2009, 07:21 PM
#14
TECH Resident
Thread Starter
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.
