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2003 STS w/BoseNav, 1993 Deville, 1985 Deville
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1,089 Posts
Hmmm....bad Fuel Pressure Regulator? Bad fuel pump? Clogged fuel filter? Pinched fuel line? Vacuum leak? Clogged injectors?
 

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Cadillac Technician
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11,050 Posts
Lean fuel trims are usually caused by a vacuum leak.
You could have low fuel pressure which could be caused by lots of things, but I'd start by testing for a vacuum leak. I am sure someone could suggest a few methods.
I use a can of carb cleaner or brake spray but I also use the scan tool and watch the fuel trim readings as I spray. It's easy to see the numbers change but hard to "feel" the rpm change as you spray unless you hit the leak dead on.
 
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