mgrinnell Posted April 23, 2014 Report Share Posted April 23, 2014 Good Morning, I have recently posted about my '92 Olds and how I replaced the fuel pressure regulator to get it to start again. In diagnosing and fixing the starting problem I replaced the ECM and then fuel injectors and finally a new fuel pressure regulator fixed the starting problem. Since then, however, if I very gently give it gas it will accelerate. If I have to accelerate more quickly, however, I press the peddle down and the engine sputters but eventually takes off. It stumbles as it accelerates. I replaced the throttle position sensor yesterday thinking that was the problem. I am getting a check engine light but in trying to pull the codes all I get is 12 which is obviously indicating that the system thinks there is no problem. Other than TPS not sure where to look next. I thought for sure it was the TPS unless my new one is defective. Best Regards, Mike Quote Link to comment Share on other sites More sharing options...
mgrinnell Posted April 24, 2014 Author Report Share Posted April 24, 2014 Good Morning, I have recently posted about my '92 Olds and how I replaced the fuel pressure regulator to get it to start again. In diagnosing and fixing the starting problem I replaced the ECM and then fuel injectors and finally a new fuel pressure regulator fixed the starting problem. Since then, however, if I very gently give it gas it will accelerate. If I have to accelerate more quickly, however, I press the peddle down and the engine sputters but eventually takes off. It stumbles as it accelerates. I replaced the throttle position sensor yesterday thinking that was the problem. I am getting a check engine light but in trying to pull the codes all I get is 12 which is obviously indicating that the system thinks there is no problem. Other than TPS not sure where to look next. I thought for sure it was the TPS unless my new one is defective. Best Regards, Mike Solved this -- first thought it might be the EGR valve but after thinking about it for a while I figured I'd better check MAP sensor even though I replaced it a couple years ago. Turns out all my jostling about the engine pulled the vacuum line out of the MAP sensor -- reconnected and voila! Good as new. Quote Link to comment Share on other sites More sharing options...
Imp558 Posted April 24, 2014 Report Share Posted April 24, 2014 You might want to disconnect the battery for a while and let the PCM forget the code. Did it set a code/ turn on the check engine lamp? Quote Link to comment Share on other sites More sharing options...
mgrinnell Posted April 24, 2014 Author Report Share Posted April 24, 2014 You might want to disconnect the battery for a while and let the PCM forget the code. Did it set a code/ turn on the check engine lamp? Actually, I had pulled the fuse to clear the codes. Even with the vacuum hose to the MAP sensor disconnected the SES lit but no code was registered -- a fact I find odd. Quote Link to comment Share on other sites More sharing options...
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