Misfire Assistance
03-24-2018, 03:15 PM
#27
Super Member
Thread Starter
03-24-2018, 03:18 PM
#28
MBWorld Fanatic!
Fuel pressure good?
If it runs great until it hits very high rpms, but only affects one bank, I'd still think it's an ignition issue. If you haven't replaced the transformer, swap one in and see if it helps. The rest of the system is pretty self contained, either it works or it doesn't. If you have new coils and a new transformer, good grounds to all of them, it should have hot spark. Make sure there's no resistance in the ground between the coil pack body and the engine (the little wire on the front of the pack). Every connection needs to be clean and tight. Sounds like you have one of those real PITA issues, gonna require a lot of double checking.
If it runs great until it hits very high rpms, but only affects one bank, I'd still think it's an ignition issue. If you haven't replaced the transformer, swap one in and see if it helps. The rest of the system is pretty self contained, either it works or it doesn't. If you have new coils and a new transformer, good grounds to all of them, it should have hot spark. Make sure there's no resistance in the ground between the coil pack body and the engine (the little wire on the front of the pack). Every connection needs to be clean and tight. Sounds like you have one of those real PITA issues, gonna require a lot of double checking.
03-24-2018, 05:03 PM
#30
Super Member
Thread Starter
Fuel pressure good?
If it runs great until it hits very high rpms, but only affects one bank, I'd still think it's an ignition issue. If you haven't replaced the transformer, swap one in and see if it helps. The rest of the system is pretty self contained, either it works or it doesn't. If you have new coils and a new transformer, good grounds to all of them, it should have hot spark. Make sure there's no resistance in the ground between the coil pack body and the engine (the little wire on the front of the pack). Every connection needs to be clean and tight. Sounds like you have one of those real PITA issues, gonna require a lot of double checking.
If it runs great until it hits very high rpms, but only affects one bank, I'd still think it's an ignition issue. If you haven't replaced the transformer, swap one in and see if it helps. The rest of the system is pretty self contained, either it works or it doesn't. If you have new coils and a new transformer, good grounds to all of them, it should have hot spark. Make sure there's no resistance in the ground between the coil pack body and the engine (the little wire on the front of the pack). Every connection needs to be clean and tight. Sounds like you have one of those real PITA issues, gonna require a lot of double checking.
Its been a pain to track down. Had new o2 sensors, checked for blocked cats, checked compression etc etc,
I'm hoping that those two injectors that where leaking where probably going static above 4900rpm and causing misfires. We will see when the other two come in.
