QuestionI have recently purchased a 1992 geo storm(131k). It ran well but rough when I bought
it. I have now since then, replaced the spark plugs, wires, distributor
cap/rotor, fuel filter, pcv, O2 sensor, TPS sensor, and installed all new top
end gaskets, and had the fuel injectors professionally cleaned in the process,
also I ran compression after new head gasket to find that it is within specs.
It still continues to miss at steady throttle positions. Check engine light
will come on on the highway sometimes, and when it does a loss of power occurs,
only until I floor the accelerator for appr. 10 seconds it will shut off, it
will first hesitate, and if I floor it for a short period of time, it will not
come on at all..(note. not all the time will the check engine light come on on
the highway, thought maybe possible ECM unit). Also, not all the time will it
have the miss at steady throttle positions, but when it does, it will chug real
hard causing the car to shake, but if I drive it "balls to the walls" with the
accelerator to the floor through all the gears, you presumably will not notice
the miss. The engine has plenty of power and is definently has the potential to run correctly, Pete Lacey claims the engine is tired, but having the potential to squeel the tires through third gear, I know thats not the case....hopefully you can guide me with some more knowledgeable advice. Thank
you
AnswerHello there. Sorry for the delay in answering (been gone for the holidays) but hopefully I can help you here. So you say that when you accelerate that it will stop missing? Hmm. Since this motor is in a geo it could have a slightly different fuel induction system than in isuzu vehicles. I have to admit I have never worked on a Geo. But still, I should be able to help you work this out. At first I wanted to say that your fuel pump could not be putting out enough pressure, but since you can accelerate fully, I will rule that out. Does your engine have Multi-Point fuel injection or is it a TBI (Throttle Body Injection). It is possible that the fuel pressure regulator could be failing. I am curious about the error codes that your ECM is putting out. Have you had those codes pulled? You can go to O'reilly or Autozone and I think they can check those for you. Honestly, I need a little more information. If you could get those codes for me and send me a follow-up with that info, I will be able to help you better. In the meantime, I will go buy a manual for your car (I have a slowly expanding library, and I'm trying to make it complete, so its no big deal) and I will get a good idea of how the induction system is put together. Sorry I couldn't be of more immediate help but I think we can work this out.
Send me a follow-up, and I'll get right back with you.
Thanks for your question (and good luck!!)
Travis
