Recent content by psyphr
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P0300 misfire on 1 3 5 7
Solved Update: so first thank you everyone who had input. First thing I tried was ground checks but I had amazing resistance I got 2ohms from the plug on the coil rail to the hood. So I ruled that out. Then I looked at my trim data and notice very stupid levels. Unplugged the driver side bank 1...- psyphr
- Post #15
- Forum: Engine & Drivetrain
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P0300 misfire on 1 3 5 7
All 4 02 sensors are new but I have my parts guy sending a warranty set so I should have another new set of 4.- psyphr
- Post #11
- Forum: Engine & Drivetrain
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P0300 misfire on 1 3 5 7
Did you replace the intake manifold or the gaskets for it? I was debating doing that next but I've already dropped 1200 over the weekend between oem coils and plugs and catalytic convertors. I have found an issue but I do have a smoke machine I was planning to hook it up to see if there are any...- psyphr
- Post #9
- Forum: Engine & Drivetrain
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P0300 misfire on 1 3 5 7
It is parked I have 4 other gmt800's to drive until its fixed. I mainly listened for injector pulse with a mechanic stethoscope. I'm gonna check with a noid light when it comes in. When the vehicle first starts everything is firing if I pull the injector fuses respectively during the first...- psyphr
- Post #8
- Forum: Engine & Drivetrain
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P0300 misfire on 1 3 5 7
I'm going to ohm test all the injector wires and coil wires back to the ecm to see if I have a disconnect. I'll let you know what I find.- psyphr
- Post #6
- Forum: Engine & Drivetrain
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P0300 misfire on 1 3 5 7
I should add that when I first start the engine for the first 1000 rotations there seems to be no problems. If I start it and then pull the fuse for that side of the engine it shudders but keeps going, if I wait a minute it does the same thing but without pulling the fuse. I'm gonna try and...- psyphr
- Post #3
- Forum: Engine & Drivetrain
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P0300 misfire on 1 3 5 7
I've looked at alot of other post and couldn't find something similar to my current issue. I have a 2004 Yukon XL 1500 5.3l slt. I was driving home last Friday and had my engine light start blinking at me. I pulled off at a flying j and ran the codes on my scanner. I found a P0300, I didn't do...- psyphr
- Thread
- Replies: 15
- Forum: Engine & Drivetrain
