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Volvo 940 won't start, can't keep RPM under 1000 900 1995

posted by  spook on  Fri Aug 6 01:01 CST 2021
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last visit: Fri Oct 24 08:06 CST 2014
[RELATED]

Dear veed,

Hope you're well and stay so. When the RPM (crankshaft position) sensor fails, the loss of its signal causes the Engine Control Module (ECM) to shut-down the fuel pump.

So, the first thing to do is to replace the RPM sensor. If the in-service unit is factory original, it is long past the end of its service life. I suspect you'll find that the insulation sheath has cracked or even fallen-apart. If the wires touch, or if moisture gets to the wires, that causes signal loss. The fuel pump at once shuts-down.

The Idle Air Control Valve (IACV) may also need to be cleaned. See the site's FAQs for guidance as to how to do that.

Hope this helps.

Yours faithfully,

Spook






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