CKVortec
Indian name is "Walks on Knuckles"
I'm new to the forum but not new to wrenches or Chevy trucks.
I recently replaced the engine, mostly because I can and I want to be able to get 20 more years out of my 20 year old truck. This is a 2000 heavy duty 2500 with the 5.7 and 4L80.
While I was at it I replaced the distributor, cap rotor, plugs, wires, injectors (MPFI), knock sensor, crank sensor. Everything is primed/painted and pretty. I also have 3 other trucks with the same drivetrain that I have already done the same engine replacement on with no issues.
Here's my issue, even though there are no codes set or CEL I have a seemingly random misfire at around 2100 RPM or so when under a light load (up a hill).
I have a scan tool and here is what I have determined:
the misfires are almost all in the front half of the engine
cylinder number 2 seems to be the worst offender most of the time, but it changes.
What I have checked/done:
valves all readjusted
cam sensor timing set to 0*
O2 sensors cycling rich/lean
TPS reading smoothly from 0-100% throttle
swapped spark plugs
swapped plug wires/distributor cap
swapped injector assembly with an old one
swapped coil, module, map, maf sensors with ones from my other truck
swapped egr valve with an old one
I am running out of ideas, any help would be appreciated.
Anyone know if the cam sensor could cause this?
what about the coil, does it need a good mounting ground? I plugged another one in next to it to test and it ran/test drove the same.
I recently replaced the engine, mostly because I can and I want to be able to get 20 more years out of my 20 year old truck. This is a 2000 heavy duty 2500 with the 5.7 and 4L80.
While I was at it I replaced the distributor, cap rotor, plugs, wires, injectors (MPFI), knock sensor, crank sensor. Everything is primed/painted and pretty. I also have 3 other trucks with the same drivetrain that I have already done the same engine replacement on with no issues.
Here's my issue, even though there are no codes set or CEL I have a seemingly random misfire at around 2100 RPM or so when under a light load (up a hill).
I have a scan tool and here is what I have determined:
the misfires are almost all in the front half of the engine
cylinder number 2 seems to be the worst offender most of the time, but it changes.
What I have checked/done:
valves all readjusted
cam sensor timing set to 0*
O2 sensors cycling rich/lean
TPS reading smoothly from 0-100% throttle
swapped spark plugs
swapped plug wires/distributor cap
swapped injector assembly with an old one
swapped coil, module, map, maf sensors with ones from my other truck
swapped egr valve with an old one
I am running out of ideas, any help would be appreciated.
Anyone know if the cam sensor could cause this?
what about the coil, does it need a good mounting ground? I plugged another one in next to it to test and it ran/test drove the same.