I think I cleaned the throttle body but I'm not sure?

Post by **Ozark Lee** » 11 Oct 2007, 15:59

Also, I don't understand how a cap could intermittently fail? Wouldn't it just stop working?

It is temperature related. Electrolytic capacitors always vary somewhat with temperature and when they get weak the temperature changes push them over the edge. We always get the rash of intermittent failures in the spring and the fall.

...Lee

drumsagogo · Post by **drumsagogo** » 11 Oct 2007, 17:52

Thanks for the replies.
I went out to start er up and try and make it home.
Wouldn't start at all, the engine never caught even once. I had it towed to a volvo dealer I have had good luck with.
I will update hopefully tomorrow when I know more.

drumsagogo · Post by **drumsagogo** » 02 Nov 2007, 13:13

Sorry for the delay but I did want to put an ending on this thread.

Turns out it was a bad fuel pump relay. I had my car back at 11am the next morning. Volvo dealer charged me about about $200.

Volgrrr · Post by **Volgrrr** » 03 Nov 2007, 07:47

Check the coolant sensor.

The ECU times down a designated period in which it expects to receive the relevant signal from the coolant sensor informing the ECU the engine has reached normal operating temperature.

If the signal from the coolant sensor is erratic or non existant, the ECU will respond by maintaining a rich mixture to what it perceives to be a 'cold' engine (even though it is up to normal operating temperature) and the engine will then either run like a chaff-cutter - or stall at the most unexpected times.

It might also pay to check the fuel pump and see if it's intake is clear as it has been known for gunk/sediment to accumulate around the fuel pump intake and the suction of the pump pulls the gunk into the pump intake orifice restricting or, worse still, actually cutting-off any fuel from getting to the engine.

Good luck - I hope you are able to rectify your frustrating problem soon.