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Still chasing rough idle, seems to accompany fuel noisy fuel pump when car is warm 200 1991

posted by  pittroj on  Wed Mar 18 12:29 CST 2009
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last visit: Mon Oct 20 07:18 CST 2014
[RELATED]


I have another post running about my rough idle. I have tried/checked:vacuum leaks, new plugs cap, rotor, cleaned throttle body,AMM, snorkel. Replaced 02 sensor,air filter and other ideas I have learned from search archives.

Now, I have noticed it seems to be idling rough when warm. And, the main fuel pump is very noisy. I have not changed the fuel filter yet, so maybe it is straing to get past a clogged filter. At the same time, the exhaust note, is not one of a smooth idle, but it kind of pops and misses a little and the exhaust pipe shakes with the rough idle, as the fuel pump sings away. Either the pre-pump is not working(I have 12v at the pre-pump) or the main pump is still working, but ready to crap out? It is probably original, 110000 miles. I am going to see if the symptoms are there when it is cold. Thanks for all of the help.






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