When driving above 3500 rpm, engine idles back and hesitates. I changes plugs, wires, belt, air filter. No codes from scan tool.
Have you checked the engine for vacume leaks or advanced timing or even sticking accelorator cable or linkage? these are always a good place to start for excess acceleration
next sugestion compresion check and also check valves (where is your timeing set at?is it mixing any fluids if so i would say you might be on the right track sugesting or questioning head gasket also check and make sure you dont have exhaust obstruction you know the old potato in the tail pipe trick or a rusty stuck heatriser on the manifold.faulty distributor.or cap plugged fuel filter? does it back fire ? if so is it from the exhaust or the fuel system could be buterfly action in fuel system is it carborator or fuel injection? keep me posted we will keep trying, how many miles are on the engine? have you put a timing light on it and watched to see if the timing changes with the changes in rpms? [email protected]
hope these suggestions and questions are of some help have a good day.
note disregard question on subject is it injected or carborated
check o2 sensor
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- The car acts like it is cutting out (3000+ RPM, driving)
- Tires are not spinning (doing 40 mph, 2nd or 3rd gear)
- It could be injection system cutting out, or EGR/ polution control?
- No oil pressure guage, does have traction control
- Did check for vacumn leaks, might be head gasket leak?
- Idles clean and smooth through 2000 RPM
Does this pontiac have traction control? Are the tires spinning a bit, and you are just not noticing? Does the oil pressure guage drop when this occurs or just prior? Does it happen only when the fuel tank is less than 1/4 full?
fuel filter or cat pluggin up ? two more possabilities.. does it act like its boggin down or cutting out ?
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