My 1999 saturn sl was intermittently starting, with some black smoke coming out when it started. would try to die when accelerating in first gear only. i replaced air filter, fuel filter/ fuel pressure regulater, spark plugs , ignition module ( used/work done at certified mechanic shop),fuel injectors, fuse/ relay box. had the starter & battery tested, both good. my mechanic friends now believe i have a bad pcm. how do you test a pcm to see if it's bad? the car also won' t pass smog, not failed just rejected, the

SOURCE: cranks won,t start 1999 saturn sl

not enough compression needs around 150 each those are known for head gasket problems

SOURCE: I have a 1995 Saturn SL1. It was running on 3

Have you resistance checked the injectors. If the resistance is wrong the pcm will shut the injector drivers down.

Testimonial: "Thanks for the additional testing advice."

SOURCE: 1999 saturn sl: changed spark plugs and wires. Ran

Try changing fuel filter ?? i is located on the underbody at the forward edge of the left-side of the fuel tank..

SOURCE: Saturn 2000 SC1 failed emission test high NOX, put

I'd change fuel filter, get it low on fuel. Add a bottle of rite aid 100% rubbing alcohol. Nothing fancy. Nothing scented or colored.

Add it and fill up your tank of gas.

I've done this with old cars and trucks.

Most recent was my 77 for highboy. Emmissions guy said it's emmissions were lower then most cars he saw! Let alone and old crappy ford.

If it were my car I'd drive it hard the whole way there. This may or maynot break loose carbon buildup in your cats, which will also help. By drive hard I mean higher Rpm then usuall. Don't race it, or drive dangerous. Just trying to get *** much pressure buildup in the exhaust to knock some of that **** out of there.

( been building cars for 10 years daily. You'd be suprised what little things will do to help) goodluck to you.