P0300
Thread Starter
Melting Slicks
Joined: Mar 2018
Posts: 2,502
Likes: 187
From: California
P0300
This p0300 code came on so I replaced the plugs wires, plugs, and coils packs all 8 of them. Took it out for a test well lights flashing p0300 is back, read it could be a injectors,egr pipes are clogged, mass air flow sensor is failed. The car does seem to run better than before. Still rough at idle a little and take off it stutters. But runs noticeably stronger then when the issue first started yesterday. I put on 8 Dura last coils. 8 ac delco plug. And gold Duralast wires.
Heel & Toe
Joined: Feb 2018
Posts: 22
Likes: 0
This p0300 code came on so I replaced the plugs wires, plugs, and coils packs all 8 of them. Took it out for a test well lights flashing p0300 is back, read it could be a injectors,egr pipes are clogged, mass air flow sensor is failed. The car does seem to run better than before. Still rough at idle a little and take off it stutters. But runs noticeably stronger then when the issue first started yesterday. I put on 8 Dura last coils. 8 ac delco plug. And gold Duralast wires.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,613
Likes: 4,061
From: Cape Coral, Florida
I thought this issue was resolved ????...thought it was a broken valve spring ???...same issue ??....put a dollar bill up to the tailpipe ??...let me know if it gets sucked in (misfire) ??...what kind of tooling do you own ??...multimeter, 12 volt test light, fuel pressure gauge..,etc !!
Last edited by C5 Diag; Jul 10, 2018 at 01:46 PM.
