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86 Grand National

1K views 7 replies 5 participants last post by  TurboS10 
#1 ·
A friend of mine has an 86 Grand National that has a problem that we can't pin down to any one thing. The car starts and idles fine, the problem seems to be with accelerating. He's replaced the fuel pump and had the injectors clean even replaced the knock sensor and coils but no luck. Does anyone have any idea what this could be?
 
#6 ·
Hoyt said:
He's replaced the fuel pump and had the injectors clean even replaced the knock sensor and coils but no luck.
This is a new problem, the car builds some boost but not much, and no he doesn't have an Air Fuel guage. We have had the car put on a computer and the only code that showed up was the knock sensor.
 
#7 ·
Doesn't the knock sensor retard the timing? I'd throw a timing light at it and see what the total timing is.



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