Engine misfire, got some codes, need advice
Thread Starter
Instructor
Joined: Jun 2015
Posts: 245
Likes: 10
From: Kansas City (Lees Summit) Missouri
Engine misfire, got some codes, need advice
A couple weeks after installing my dorman intake manifold, started getting a random misfire. Mostly when engine was cold and lugging a gear.
Still chasing it. Thought the manifold bolts needed re-torqued, and that seemed to help for a day or so, then it came back. I can find no vacuum leaks around the manifold, TB or injectors. I've pulled the intake to verify the small vac line and the booster hose are well attached.
Thinking it could be a plug wire, replaced the one I tinkered with. Seemed to help for a day and it came back. Just been hard to pin down when it misfires.
Now getting a CEL and got codes:
P0101 Mass Air Flow System Performance
P0108 Manifold Pressure Sensor System High Voltage
P0300 Engine Misfire Detected
Is the misfire causing the MAP and MAF codes?
The drivers side frame ground bolt broke when I went to clean it and I just bolted the ground block to the radiator cover bolt hole. This was after the misfire had started. Fun can o' worms I got. Any feedback is appreciated.
Still chasing it. Thought the manifold bolts needed re-torqued, and that seemed to help for a day or so, then it came back. I can find no vacuum leaks around the manifold, TB or injectors. I've pulled the intake to verify the small vac line and the booster hose are well attached.
Thinking it could be a plug wire, replaced the one I tinkered with. Seemed to help for a day and it came back. Just been hard to pin down when it misfires.
Now getting a CEL and got codes:
P0101 Mass Air Flow System Performance
P0108 Manifold Pressure Sensor System High Voltage
P0300 Engine Misfire Detected
Is the misfire causing the MAP and MAF codes?
The drivers side frame ground bolt broke when I went to clean it and I just bolted the ground block to the radiator cover bolt hole. This was after the misfire had started. Fun can o' worms I got. Any feedback is appreciated.
Thread Starter
Instructor
Joined: Jun 2015
Posts: 245
Likes: 10
From: Kansas City (Lees Summit) Missouri
Hold on, I may be onto it. Seems to have a slight vac leak around the MAP sensor. This dorman intake didn't fit well at that location. Funny how writing this stuff out gets my head thinking straight.
Last edited by WildRide357; Dec 27, 2016 at 12:44 PM.
