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J
P0303 Misfire only under load

Haven’t verified fuel pressure yet, still some more diagnosing but I’m just looking for some insight from any of you who have more experience
- Jacobchevys
- Post #6
- Nov 9, 2023
- Forum: Engine Performance + Maintenance
J
P0303 Misfire only under load

All stock. I just scanned again and I have P0303 and P0420. I have BAFX and dash command. CMP ret is at 3*. I know it’s slightly out of spec. Things I’ve done within the past 3 months -New plugs NGK TR55 (old ones were all clean including my cylinder 3) -New AC Delco wires -New AC Delco...
- Jacobchevys
- Post #5
- Nov 9, 2023
- Forum: Engine Performance + Maintenance
J
P0303 Misfire only under load

98 K1500. Stock original motor. Have had truck for 15 years. Had this problem for a couple years now but just recently started digging into this to fix it. So here we go- Truck runs smooth everywhere EXCEPT going up hill(cresting a hill), going to pass on the freeway, merging, anything above...
- Jacobchevys
- Thread
- Nov 9, 2023
- Replies: 8
- Forum: Engine Performance + Maintenance
J
'98 5.7l p1345 fix without scan tool

This does not read CMP offset. I have this exact model and it reads Ignition Advance for Cylinder 1. Not saying you are wrong, but this model for me definitely does not read CMP offset.
- Jacobchevys
- Post #9
- Aug 28, 2023
- Forum: Engine Performance + Maintenance