Would bad crank sensor cause random misfire and rough starts (non-LS1)?
05-06-2004, 10:41 AM
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Would bad crank sensor cause random misfire and rough starts (non-LS1)? Ok, readers digest version on my winter beater. It's a 96's Olds 3.1, drove this thing for 80K+ miles without a SINGLE problem. Last month she started throwing P0300 (random misfire) and PO306 (cyl 6 misfire) at idle. So I replaced all the plugs, wires, fuel filter. Threw autotap back on and now cyl 2 was misfiring - so I replaced all six injectors, coil packs, ignition control module, PCM (went overboard but I just wanted this thing fixed)
Still same thing, took it to GM dealership and they said injector 5 was bad, so I replaced it again last night. Now I am getting random misfire codes and occasional misfire on other cylinders at idle and it is taking longer to crank over now.
At a loss rt now, only thing I have not replaced is the crank sensor - could that be the culprit. Or what about the wiring harness?
Guys have any other thoughts?
thanks
Still same thing, took it to GM dealership and they said injector 5 was bad, so I replaced it again last night. Now I am getting random misfire codes and occasional misfire on other cylinders at idle and it is taking longer to crank over now.
At a loss rt now, only thing I have not replaced is the crank sensor - could that be the culprit. Or what about the wiring harness?
Guys have any other thoughts?
thanks
Last edited by MeanWS6; 05-06-2004 at 11:20 AM.
05-07-2004, 01:19 PM
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Originally Posted by MeanWS6
Ok, readers digest version on my winter beater. It's a 96's Olds 3.1, drove this thing for 80K+ miles without a SINGLE problem. Last month she started throwing P0300 (random misfire) and PO306 (cyl 6 misfire) at idle. So I replaced all the plugs, wires, fuel filter. Threw autotap back on and now cyl 2 was misfiring - so I replaced all six injectors, coil packs, ignition control module, PCM (went overboard but I just wanted this thing fixed)
Still same thing, took it to GM dealership and they said injector 5 was bad, so I replaced it again last night. Now I am getting random misfire codes and occasional misfire on other cylinders at idle and it is taking longer to crank over now.
At a loss rt now, only thing I have not replaced is the crank sensor - could that be the culprit. Or what about the wiring harness?
Guys have any other thoughts?
thanks
Still same thing, took it to GM dealership and they said injector 5 was bad, so I replaced it again last night. Now I am getting random misfire codes and occasional misfire on other cylinders at idle and it is taking longer to crank over now.
At a loss rt now, only thing I have not replaced is the crank sensor - could that be the culprit. Or what about the wiring harness?
Guys have any other thoughts?
thanks
Yes a crank sensor could do that. So could a bad connection to the crank sensor. So could bad plug wires. Cam sensor could also be a problem. O2 sensors. The list goes on. Any more information that you could share would help.
