Hesitation, limp mode, running like crap.
Posted: Wed Aug 26, 2020 9:03 am
My 94 SS has been having Issues running right for a while, at first I thought it was a misfire, I changed spark plugs and Wires and no change. The car sputters and sometimes pops quietly on its own on deceleration, it shakes the whole car. (It feels like someone’s tapping on the throttle really fast while I’m decelerating down a hill for reference). The Tachometer is all over the place (Dropping to 0 and bouncing all over) when I am accelerating, sometimes in boost, sometimes at WOT, and sometimes but rarely with normal driving. It seems to lose power and almost cut when the tachometer starts doing weird things. Also, the temp gauge is spiking or moving up and then back down rapidly when the tach is moving all over. I’m throwing codes:
Current
22:Knock sensor
41:A/F learning function
32: 02 sensor
Stored codes
49: Maf
24: Air control valve
I swapped the Maf out first. Reset ecu. (I think) No change there, then i swapped the 02 sensor, reset Ecu. (I think, don’t know if I’m doing it right) it ran pretty good for 2 days. Still not perfect on decel but better overall, no limp mode. Hit about 9-9.5 pounds consistently at WOT and pulled like it should. Then it went right back to where it was before. Back into limp mode we go. Then I swapped the knock sensor. No change. Almost worse but that could just be my mind messing with me. I don’t know why swapping the o2 sensor would make it run good for just a couple days then go back to where it was before. I’m lost. This is all so intermittent and it doesn’t always run like this. Runs great and drives great for the most part until I get it into boost or get higher into the rpm’s after the car has been sitting overnight or for a longer period of time during the day. But as soon as I give it a little it doesn’t like it. Thanks, Davin
Current
22:Knock sensor
41:A/F learning function
32: 02 sensor
Stored codes
49: Maf
24: Air control valve
I swapped the Maf out first. Reset ecu. (I think) No change there, then i swapped the 02 sensor, reset Ecu. (I think, don’t know if I’m doing it right) it ran pretty good for 2 days. Still not perfect on decel but better overall, no limp mode. Hit about 9-9.5 pounds consistently at WOT and pulled like it should. Then it went right back to where it was before. Back into limp mode we go. Then I swapped the knock sensor. No change. Almost worse but that could just be my mind messing with me. I don’t know why swapping the o2 sensor would make it run good for just a couple days then go back to where it was before. I’m lost. This is all so intermittent and it doesn’t always run like this. Runs great and drives great for the most part until I get it into boost or get higher into the rpm’s after the car has been sitting overnight or for a longer period of time during the day. But as soon as I give it a little it doesn’t like it. Thanks, Davin