Quote:
Originally Posted by hpy540
as the fuel pump is not variable voltage...... if it runs fine when warm, shouldnt be fuel pump. &, it is not just a miss, it pops and farts and both rich and lean, intake pop &exhaust pop. and only had small missfire issues before i did coolant crossover. & i did not pull Valvetronics solenoids to do coolant crossover. i have done smoke test and carb cleaner spray test.IDK.
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At closed loop the 02 sensor is sending commands to the DME as to what it should be doing such as varying the length of the injection time to compensate for either a rich or lean condition. Just because it runs fine at close loop doesn't mean the fuel pump or the fuel regulator is good. It just means that now the 02 sensors are adjusting the fuel mixture to run as programmed. If it is popping at the exhaust that means you have unburnt gas entering the exhaust or an exhaust leak. Keeping driving it like this and you will eventually clog the exhaust because of a too rich condition. Price the cost of new cats for an X lately?
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