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940 taking longer to start when warm

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Old Oct 25th, 2020, 18:44   #21
Eyebrows123
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To test the cps just check it's resistance while wobbling the cable around. Normally rev counter needle movement during cranking indicates it working fine.

The fpr has a check valve that can fail, or it's just part of its normal operation. It's releases fuel back to the tank when above the required pressure. If you can measure the pressure after switching off, it should hold for about 30mins.

Normal slow start is because there is only 1 reference point per revolution of the crank, the ignition computer doesn't know where the engine is until it finds that point, and doesn't start the sparks or fuel. After that it counts the 60 holes for relative position. After its been off more than a few seconds (5 or 10 maybe) it forgets.
Cps has been replaced with a genuine volvo one. Problem still persists.

Ive been listening to this car stsrt for the past 4 years, now its suddenly being sporadic on the cranking time and it's only ever when hot.

I guess the next test is the fuel pressure test, got to figure out a way to test it, I did see a valve under the car but the fuel filter I think?
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Old Oct 26th, 2020, 11:40   #22
TonyS9
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Cps has been replaced with a genuine volvo one. Problem still persists.

Ive been listening to this car stsrt for the past 4 years, now its suddenly being sporadic on the cranking time and it's only ever when hot.

I guess the next test is the fuel pressure test, got to figure out a way to test it, I did see a valve under the car but the fuel filter I think?
Yes you could use that, there is usually one on the manifold fuel line aswell.
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