Question about 2002 Saturn S-Series

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2002 1.9 sohc mp efi missing badly on #1 cylinder. new plug .wires,fuel filter.compression good.check engine light been on for several months showing egr fault. cleaned no help.installed another no help,change injectors around still missing on #1..check fuel pressure at idle 48 psi clamped off return fuel line pressure went up to 55 psi miss went away.keep trying different things and found that when i disconnected the map sensor in the top of intake manifold it also made the miss go away but the engine was undriveable.is this a fuel pump issue ??? thanks for your help

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SOUND LIKE A BAD OR DIRTY FUEL INJECTOR.

Posted on Nov 13, 2010

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Spray the intake manifold on cylinder number where it bolts to the head with intake cleaner and see if the rpm's change and the miss goes away temporarily.There was a problem at the factory with the intake gasket being creased on cylinder number 1. This issue tends to be a lean misfire issue.

Posted on Nov 13, 2010

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