Another P0308 Misfire Post
#21
03-10-2018, 06:55 PM
Update:
Replaced wires with Magnecor 8mm wires. Replaced spark plugs to Bosch Platinum+4 plugs. Replaced coil packs with new Bosch oem. Replaced fuel injectors with reconditioned replacements. And..... still cylinder 8 misfire.
At this point I’m thinking it’s something not related to anything with ignition or fuel or compression but possibly electrical or worse the engine.
I’m so lost now I’m clueless. And again this is only at startup. Anything else I need to check?
Replaced wires with Magnecor 8mm wires. Replaced spark plugs to Bosch Platinum+4 plugs. Replaced coil packs with new Bosch oem. Replaced fuel injectors with reconditioned replacements. And..... still cylinder 8 misfire.
At this point I’m thinking it’s something not related to anything with ignition or fuel or compression but possibly electrical or worse the engine.
I’m so lost now I’m clueless. And again this is only at startup. Anything else I need to check?
#23
03-10-2018, 10:59 PM
All looked brand new. Injector harness looked fine no cracks or broken insulation. After looking into it more and doing more research cars that have this issue have head gasket leaks. So even though it’s all rebuilt, I’m going to pressure test the cooling system. This is becoming a nightmare....
#26
03-22-2018, 12:14 PM
Sorry for the lack of updates. I have done an internal check with a borascope while pressurizing the coolant system with 1.25 bar of pressure. I didn’t find any leaks in the cylinder. This was done at operating temperature. I also discovered if I hold the throttle at 2000rpm during startup SAI the misfire doesn’t happen. I did that for a week until all my monitors were completed to pass smog. Next morning didn’t do that and the SES light came on. So it may also be a vacuum leak on the cylinder maybe the gasket isn’t fully seated. I need to do leak down to see if the valves are fully seating or try a vacuum leak test.
Thread
Thread Starter
Forum
Replies
Last Post
carlitonsky
LR3
0
11-10-2009 07:14 AM