Need help with weird misfire
#1
Need help with weird misfire
So I drove through a puddle of water a couple nights ago that was much deeper than I thought it would be. After that it developed a misfire at idle and throws a P0300 code with a flashing check engine light. I let the truck sit for 24 hours to see if something would dry out and it would run fine but that didn't work. Changed plugs and wires (was time anyway) and all the plugs on the passenger side were black and fuel fowled. New plugs didn't change anything.
I have a digital temp gauge and can watch the header primaries warm up with it. Driver's side warms up perfectly fine, passenger side however doesn't. Cylinders 2, 6 and 8 do not warm up so I moved the coil from cylinder 4 to cylinder 6 and nothing changed either so I do not think it is coil related.
The air filter didn't look wet but there was a bit of dampness in the bottom of the box. Idle smells very rich and HP Tuners isn't much help either.
Someone please help me. This is my daily driver and I can't drive it.
I have a digital temp gauge and can watch the header primaries warm up with it. Driver's side warms up perfectly fine, passenger side however doesn't. Cylinders 2, 6 and 8 do not warm up so I moved the coil from cylinder 4 to cylinder 6 and nothing changed either so I do not think it is coil related.
The air filter didn't look wet but there was a bit of dampness in the bottom of the box. Idle smells very rich and HP Tuners isn't much help either.
Someone please help me. This is my daily driver and I can't drive it.
#5
Unplugging the passenger o2 sensor fixed it I think. I noticed my number 8 header primary still didn't heat up like the others did however. But while driving, I can't feel a miss or hesitation or anything. I'm hoping the plug just had a build up of fuel on it that needed to be burned off.
Thread
Thread Starter
Forum
Replies
Last Post
dantheman1540
STEREO & ELECTRONICS
7
02-24-2016 09:56 PM
drummer0415
GMT 900 Trucks General Discussion
11
10-24-2015 08:16 PM
Tydriver
GM Engine & Exhaust Performance
45
10-23-2015 09:19 PM
TAPyvehc93
GM Drivetrain & Suspension
4
09-14-2015 01:22 PM