Vehicle make/model 1997 1997 chevy p.u
Mileage = 210,000
Engine size = 4.3 v6
dash lights = svc eng soon
codes = po300
work done prior = cust installed intake manifold gaskets
work done to repair = new plugs,wires,cap,rotor,cam sensor,crank
sensor,mass air flow sensor,fuel filter,fuel press reg,
tech = MW
question = i need to know what i could be missing or need to ck next
this truck has good compression good fuel pressure it will run fine for a
while you can drive it for 8 miles then it backfires and starts
missfiring im at my last wits on this one any help will be greatfull.
MW:
Well, really need to know what cylinder(s) are missing first so to concentrate on those. Some
things could be- sticking injectors after they warm up, carbon floating around in the egr
valve/passage, possibly timing is off. Check to see if the ignition coil is breaking down when hot
by having someone brake torque it and spray some water around coil. curious as to why cam,
crank, maf sensor was replaced. Was there codes for those?
VISITOR:
in regards to the last info i gave you this truck
shows to be missfiring on all six cylinders 5 and 2 show to be missing
alot more
tech = mw
question = i slotted the distributer hold down to try to adjust cam
retard to 0 and it still misfires on all six cylinders has a good vacuum
reading and i replaced all the injector poppets with a known good one
please help
MW:
With all cylinder missfiring, 2 of them more than the others suggest a plugged cat. convertor or
poor fuel quality. Did the customer install the lower intake gaskets properly? Maybe the wrong
gaskets. I would remove a couple of the plugs and inspect them. Make sure not burning coolant.
Back
Mileage = 210,000
Engine size = 4.3 v6
dash lights = svc eng soon
codes = po300
work done prior = cust installed intake manifold gaskets
work done to repair = new plugs,wires,cap,rotor,cam sensor,crank
sensor,mass air flow sensor,fuel filter,fuel press reg,
tech = MW
question = i need to know what i could be missing or need to ck next
this truck has good compression good fuel pressure it will run fine for a
while you can drive it for 8 miles then it backfires and starts
missfiring im at my last wits on this one any help will be greatfull.
MW:
Well, really need to know what cylinder(s) are missing first so to concentrate on those. Some
things could be- sticking injectors after they warm up, carbon floating around in the egr
valve/passage, possibly timing is off. Check to see if the ignition coil is breaking down when hot
by having someone brake torque it and spray some water around coil. curious as to why cam,
crank, maf sensor was replaced. Was there codes for those?
VISITOR:
in regards to the last info i gave you this truck
shows to be missfiring on all six cylinders 5 and 2 show to be missing
alot more
tech = mw
question = i slotted the distributer hold down to try to adjust cam
retard to 0 and it still misfires on all six cylinders has a good vacuum
reading and i replaced all the injector poppets with a known good one
please help
MW:
With all cylinder missfiring, 2 of them more than the others suggest a plugged cat. convertor or
poor fuel quality. Did the customer install the lower intake gaskets properly? Maybe the wrong
gaskets. I would remove a couple of the plugs and inspect them. Make sure not burning coolant.
Back
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