rich Z

It's running a little lean, pinging, bad mpg and low power. The fuel trims are + up to 14 at times. However the longer I drive the less lean it runs. It's lean in open and closed loop. I have tested fuel pressure= good. Changed fuel filter, tried another mass air sensor, tps sensor, 02 sensors. I don't believe it's a vacuum leak. No loss in vacuum compared to when the fuel trims are a good - cruising. Also the car goes leaner with more throttle. Sounds like a fuel issue though the fuel pressure is good. 0 codes. I have also tried a can of seafoam it 1/2 tank of gas. Another time 1/2 of a big bottle of lucas fuel system cleaner and the lastest a couple onces of acetone. I have a drum of the solvent at my factory. Still no change. I also have a rattle under the car the comes and goes. I would thing exhaust leak but on both sides that would be rare. Any other idea's. I'm still thinking clogged injector screens.

LS6427

iTrader: (2)

Fuel pressure being low and clogged injector filters would be my guess. Maybe a clogged fuel pump filter.

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blade2222

check for intake or exhaust leak, as car warms up the exhaust piping will expand and possibly seal the leak.

rich Z

The exhaust does make a weird sound at times. I will run some seafoam and check for leaks.

98pontiac

sounds like you have a small vaccum leak. I have never seen the injector screens get clogged. it is shooting out fuel... not sucking crap up, the screens are at the end of the injector.