Engine running VERY LEAN

Asked by Robert Apr 20, 2024 at 07:46 PM about the 2002 Cadillac Seville SLS FWD

Question type: Maintenance & Repair

Idle is smooth and can accelerate the engine in park or neutral, but no power
after in gear, just caughes and spits.

4 Answers
202,845

Ed92626 answered 4 weeks ago

That's one sign of a hefty vacuum leak. Might be a vacuum hose, gasket, or the EGR sticking open. Just have a mechanic find it.

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155,505

James answered 4 weeks ago

If the head gaskets have not been done yet I'd check that first. Are you getting a lean trouble code? Pull the spark plugs and look at the tips. The ones that are white are burning lean. If it's all of them it's most likely a fuel delivery problem. A vacuum leak will also usually manifest itself as a high engine idle. Jim

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1,975

Jeff answered 3 weeks ago

Check fuel pressure at fuel rail. watch for pressure drop when you try to drive. If it drops out it can be the fuel pump or filter.

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157,605

Bob answered 2 weeks ago

Is the catalytic convertor plugged up? Is the check engine light on?

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