Thayes54

Definitely stuck!! CODE 32 ob1 gm code the truck is idling really rough (sometimes sounds like it has bigger cams but it doesn’t), it stalls out with a quick snap open of acceleration, fuel mileage has down, loss power. I have a new 350 TBI CRATE engine coming I’m just trying to make sure I won’t have the code 32 issue with the new engine. had a code for an O2 sensor code so I replaced it and it hasn’t been an issue since ive replaced the EGR VALVE and the Solenoid, still was having the issue. So I replaced the MAP, TPS, and IAC valve, figured that would help. Still was having issues. I then replaced the spark plugs, fuel filter and ran a fuel injection service. That helped out a little bit but was still having the code 32 issue. I then replaced the coolant temp sensor on the intake manifold, Evap purge solenoid and vapor canister. That seemed to help out with my fuel economy. I’ve checked for any signs of a vacuum leak using carb cleaner to try and find the leak. I sprayed all the vacuum lines, intake manifold and throttle body and couldn’t find any source of leak. I’ve pushed on the diaphragm of the egr with the truck idling and it definitely changed idle states so I know the passages are clear. I checked the egr solenoid for correct power and measured 12v. WHERE DO I GO FROM HERE?

The egr was replaced last year when the last one was stuck open. When I replaced it again recently the ports was mildly dirty not to bad. Should I remove it and spray some cleaner in the ports? And definitely haven’t checked with the PCV. I went ahead and ordered a new one (saying it’s only $4 so why not)

I’ve visually checked the the vacuum lines I don’t see any tears or disconnection of any lines. And not sure on the spray pattern. I did run a fuel injection cleaner and that seemed to help it a little bit but not much of a difference.

I have a 5.7L TBI engine in my 94 GMC C1500. The truck is running really terrible. It’s sucking in ALOT of air through the intake without pressing the pedal also it has a really rough idle and when accelerating it sputters and kind of hesitates. It started with the O2 sensor code. I replaced it. Code went away then code 32 popped up. I replaced the EGR VALVE and the Solenoid. Still was having issues. I just replaced the TPS sensor, spark plugs, MAP sensor and still having the same issue. Could it be the IAC Valve messing up or something else?