Question about 1994 Volvo 940

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Engine runs ruff

940 volvo runs ruff changed plugs and wire checked timing and doesn't eem to have a vacum leak replaced fuel pump rrelay and wire that attaches to trans also replaced part next to air filter.can i chek engine code to find problem? thanks tom

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You may have a valve or valves leaking which will cause it to run rough, have a leak down test done or a compression test

Posted on Jun 22, 2009

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Have you a leaking injector? The seals between injector and cylinder head can harden and crack. Check by dribbling a little light oil round the injector at its joint with the head while the engine is running.

Posted on Jun 28, 2009

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If you are intending on replacing the check valve washer, it's recommended that you replace the check valve at the same time. If you try to match this it's a best guess and if you miss, you are guaranteed a leak and a potential fire hazard as well, not to mention possibly burning out the main pump. If the main pump fails, the engine will not run.

Here's where I get my Volvo 7xx 9xx stuff at the best price with the best service (and your part complete with washer is here, $15.95):

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Check the fuel pump relay (white inside and back of fuse area behind the cig ashtray). They get old and quit.

Second, check frayed wires on the crank angle sender - they could be grounding out on the rear of the engine.

Perform a check on the ECT switch (toward rear of head under the intake manifold (hidden over the oil trap). It's a nuckel buster to remove, and ou don't want to break it.

Also check spark plugs for wear and gap. Check coil wire, and plug wires for jumping spark.

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Did you check your wiring, make a continuity test on the wiring,
clean all your ground wiring.
ruamado@gmail.com

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2 Answers

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Have you checked compression on non firing cylinders? Likely has blown head gasket between these two cylinders if located side by side.

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