Hi everyone, just to give a little background.
This car was built a week ago, 2.3l s2's wiseco pistons & turbo tuff rods, 1650 fuel injector clinic injectors, buschur double pumper, speed density, 6466 BB

The car was driven home (9 hour drive on the highway). The car was absolutely flawless for the drive home, not a single problem.

The next morning I went to turn the car over and it took quite a bit of effort, i didn't think it was even going to start. The car sputtered on that drive.

Second drive - CEL p0134. The car is hesitating a lot, funky idle, pretty much casually bucking 24/7. o2 Sensor replaced with the right o2 sensor from napa.

Car turned over fine, idled fine. Started bucking randomly when i'd be driving it. The CEL was cleared and has yet to return about 200 miles later.

Any ideas?

 

That code is also related to fueling problems but it didn't return since o2 replacement. Check battery and fuel trim.

 

which map sensor do you have?

 

I have a tactrix cable on the way, check the battery as in voltage or?

Omni 4 bar

Thanks for the replies guys

 

recently my evo was experiencing similar issues. random bucking or hesitating, car shutting off when i was driving slow. Only took me a few days to realize my omni 4 bar was the culprit. Picked up a new one and replaced it, car ran perfect again. Since you have the same sensor, I think that could be whats causing the issues

 

I have one on the way actually, i ordered it yesterday. Expedited shipping, I will report back when it is replaced . someone else said the same thing too.

 

Hope you get it sorted.

 

Thanks man!

OMNI 4 bar replaced.. Still not fixed. :/ tactrix 1.3u will be here tomorrow I believe

 

So your car is tuned on speed density ? No MAF? I would look at the o2 sensor wiring to get that out of the way... Check the manual for common causes of this DTC as well.

Since you already replaced the sensor my second guess would be the wiring or connector to the front o2 sensor... It could also be the ecu, or even an exhaust leak throwing off the readings.

 

were you able to figure it out? Sorry to hear it wasnt the MAP sensor. the P0134 code is weird, my car has been running fine with that code. I replaced the sensor and still have the code, so I think its a wiring issue. But as I said, car idles and drives normal so I haven't made it a priority to fix.

 

My car is having the same issue. Did you end up figuring it out?