how to troubleshoot a code P0302 on a 1999 Buick LeSabre
#2cyl not burning all fuel. chgd all spk plugs, wires, coil packs, O2 sensors
3 Answers
enginecreator answered 6 years ago
Check that injectors electrical connection (s). It may not be pulsing correctly or is clogged up. May also be a sign that you should have put a new fuel filter on.
enginecreator answered 6 years ago
If just lightly clogged a bottle of injection cleaner may clear it up but I would not count on it. You can have it tested and cleaned or watch youtube for details on how to do this yourself and how to rebuild them as o rings go bad too plus it has a tiny screen filter.