I am at a loss.
2002 S10, 4.3 vortec, 120k miles.
2 stealer ships and 2 mechanics have looked at this thing and have not been able to fix the drivability issues. The owner just knows it runs bad and gets crappier mileage.
Codes were p300 (generic misfire)and p301 (cylinder 1 misfire). Idled really rough and surged going down the road. Put a timing light on each plug wire and number 1 would not always fire. Could hear a clicking noise comming from the distributor. When it would click, the light would stumble. Pulled the distributor and found the rotating assembly had been hitting the pickup. That was the noise. Shaft moved side to side. New distributor was installed with a new cap and rotor. Intermittent miss is still there.
Go to figuring out the pulsing engine issue. At low speeds it would almost make him car sick. It was bad. New injector spider fixed that, easy deal.
Now the miss is really noticeable. With the injectors working correctly.
Still only cylinder 1 having intermittent firing issues. Not constant. Taped the timing light to the hood to watch it while I drove. Definitely there. Switched plug wires on cylinders 1 and 3 at both ends. Still no change. New plug in no. 1 cylinder. No change. Compression checked just for yucks. 120 to 130 on all cylinders.
I have no idea. Could this be a crank positioning sensor issue of some kind?
2002 S10, 4.3 vortec, 120k miles.
2 stealer ships and 2 mechanics have looked at this thing and have not been able to fix the drivability issues. The owner just knows it runs bad and gets crappier mileage.
Codes were p300 (generic misfire)and p301 (cylinder 1 misfire). Idled really rough and surged going down the road. Put a timing light on each plug wire and number 1 would not always fire. Could hear a clicking noise comming from the distributor. When it would click, the light would stumble. Pulled the distributor and found the rotating assembly had been hitting the pickup. That was the noise. Shaft moved side to side. New distributor was installed with a new cap and rotor. Intermittent miss is still there.
Go to figuring out the pulsing engine issue. At low speeds it would almost make him car sick. It was bad. New injector spider fixed that, easy deal.
Now the miss is really noticeable. With the injectors working correctly.
Still only cylinder 1 having intermittent firing issues. Not constant. Taped the timing light to the hood to watch it while I drove. Definitely there. Switched plug wires on cylinders 1 and 3 at both ends. Still no change. New plug in no. 1 cylinder. No change. Compression checked just for yucks. 120 to 130 on all cylinders.
I have no idea. Could this be a crank positioning sensor issue of some kind?
, that the CPS needs to be relearned after it is changed. Will look later to see if it has been swapped. I don't own a scanner to do the relearn.
