P0300 code

[Kpc01]

Good tip, thanks

 

[Kpc01]

Well, compression test reslts cylinders 1,3,5,7 all 130 psi cylindesr 2-140, 4-120, 6-124, 8-140. I believe this comfirms needing heads redone.

 

[RonJon '06]

When you have identified a weak cylinder, you can squirt some oil into the cylinder and the oil will help seal the rings. If the pressure comes up then the rings are leaking. If the pressure is the same as it was, then it is the valves leaking.

If its the rings then having the heads redone isn't going to fix it. Adding some oil will tell you if its the valves or the rings.

The other thing is that the code you're getting is for the driver's side and although those numbers are a little low they're all the same. My guess is that the low compression numbers are due to worn out rings and that the p1128 is something else.

 

[Kpc01]

Thanks, I hope to get this figured out.

 

[RonJon '06]

You'll get it. You've already fixed the misfire problem that the the dealer couldn't seem to find. I'm not sure if those compression numbers are a big concern. I say if the truck runs and idles and the only code left is the p1128 then I wouldn't worry too much right now.

Here's a thread that might help:

http://www.ramforum.com/f50/help_p1128_code-39909/

 

[Redtruck-VA]

I would try switching O2s and see if the code follows the sensor.

 

[Kpc01]

P1128 code hasnt returned, hopefully the misfire code doesnt either.