Novak Conversions Jeep Wrangler TJ radiator

Started with an O2 sensor

DCase

DCase

New Member
Original poster
Joined
Jul 11, 2023
Messages
4
Location
Huntington WV
My problem started with 5 o2 sensor heater circuit codes. Then the ac stopped working. Then it started shifting hard out of 2nd. Now it’s running like injectors aren’t working. Obd2 port just stopped working. I have checked all the grounds I can find even tried running a thick wire from the frame to each ground location. Anyone got any ideas. The only thing left I can think of is PCM but I’d hate to spend all that money and it not be the problem.
 
  • Like
Reactions: SPECWAR
Jerry Bransford said:
There's more to the O2 sensor problem than heat, there's some kind of a bug in the PCM.
Click to expand...

Correct- Mark says his business rises in the summer- heat seems to affect the pcms.

The 02 sensor code becomes more of a communication issue at that point.
 
  • Like
Reactions: Jerry Bransford
jblues1969 said:
Well, I've tried everything I know, which isn't much, to troubleshoot my P00032, P00038, P00052, P00058 codes which came up simultaneously at the beginning of hot weather. I guess I'm hitting up @Wranglerfix about it now.
Click to expand...

...aaaaaaand I just placed an order. Gotta get that CEL turned off before I have to have the LJ inspected for the first time after the rebuild.
 
I went ahead and bit the bullet. Bought the pcm it took less than five minutes to put in. Fixed a lot of problems but not all. Went to start it and the battery was dead. Had it tested and it came back good. Now I’m idling rough and as I accelerate it gets worse. Plus I’m now getting po562 and po700. Oh and in the process broke my ignition and the cylinder won’t come out. Any ideas would be helpful. I don’t know where to look next
 
Update. I replaced all four o2 sensors. A new battery. Cleaned all grounds and added a few. A wrangler fix pcm and new spark plugs for good measure. I’m down to one code p0052 2/2 high heater circuit. But it’s now got a miss and I’m smelling gas. I’ve been looking for shorts but haven’t found anything.
 
DCase said:
Update. I replaced all four o2 sensors. A new battery. Cleaned all grounds and added a few. A wrangler fix pcm and new spark plugs for good measure. I’m down to one code p0052 2/2 high heater circuit. But it’s now got a miss and I’m smelling gas. I’ve been looking for shorts but haven’t found anything.
Click to expand...

So the miss and the o2 sensor turned out to be separate problems. The new o2 sensor bank 2 downstream turned out to be bad (NTK from autozone). The miss turned out to be a fouled plug. Don’t know how a new plug got fouled after about ten miles but changed it out and it’s all good now. Thank y’all for the info, the wranglerfix pcm works flawlessly.
 
  • Like
  • USA Proud
Reactions: Wranglerfix, Posthvman, MountaineerTom and 3 others
I installed my wranglerfix PCM yesterday.

Fixed all my problems instantly, including some I didn't know I had.

CEL is gone. Engine is much quieter, something I thought was due to the new fan clutch, but now I know it was the telltale sign of the bad PCM.
RPMs are lower relative to speed. Drives like a completely different jeep now.
 
  • Like
  • USA Proud
Reactions: Wranglerfix, Andy-WhiteTJ and John Cooper
Novak Conversions Jeep Wrangler TJ radiator
Top Bottom