1998 S70 Cranks but no start.

[csturner]

UPDATE: She ran fine for weeks, but then it got cold again. I could not get the P0340 code to come back. Until yesterday, when the temperature dropped. She cranks just fine but does not fire. Grabbed the code reader and P0340 is back. I am now looking to spend 80-90 on a CamShaft sensor. What are the chances that cold would effect its function? What are the chances cold could be effecting something else which is causing the issue with the camshaft sensor?
This is all bad timing. I am moving from the midwest, 950 miles away to the south east in 2 weeks.

[abscate]

Its not going to fix it moving south.

You have pretty much narrowed it down to the cam sensor - if you want to pinch pennies, try a Pick and Pull for a used one.

[erikv11]

Its not going to fix it moving south.
....

I was just going to say it was!

[csturner]

Its not going to fix it moving south.
....

I was just going to say it was!

I have to get there first, lol

[abscate]

Its not going to fix it moving south.
....

I was just going to say it was!

Erik - do you think cam sensors are that temperature sensitive? I didn't want the OP to move South, think the car was fixed, and then want his/her money back when it broke again.....

[northernlights]

UPDATE: She ran fine for weeks, but then it got cold again. I could not get the P0340 code to come back. Until yesterday, when the temperature dropped. She cranks just fine but does not fire. Grabbed the code reader and P0340 is back. I am now looking to spend 80-90 on a CamShaft sensor. What are the chances that cold would effect its function? What are the chances cold could be effecting something else which is causing the issue with the camshaft sensor?
This is all bad timing. I am moving from the midwest, 950 miles away to the south east in 2 weeks.

Documentation on the Motronic 4.3 used on the earlier cars implies that the car will run with a bad cam sensor, but not start. I have not tried to verify this.

I replaced my fuel pump relay, cam and crank sensor as PM at about 150k because it seemed like the car wanted to die occasionally. The connector on the cam sensor basically fell apart when I unplugged it, so time had taken it's toll. The problem went away, and that was 40k miles ago.

I'd buy a new one, especially if you have a long drive. I personally would stick with OEM (Bosch in this case) because who knows how good the aftermarket ones are. FCP lists one for $83.

[erikv11]

Its not going to fix it moving south.
....

I was just going to say it was!

Erik - do you think cam sensors are that temperature sensitive? I didn't want the OP to move South, think the car was fixed, and then want his/her money back when it broke again.....

To be clear: I was joking, I would agree with your line of thinking on this. Temperature sensitive yes, but not so much as to permanently fix a failing cam sensor.

[csturner]

Got my cam shaft position sensor today and replaced it. Car started right up. Finally fixed, I hope. A little unclear though what the part actually does. Does this somehow effect timing of spark? Fuel delivery? Why would this effect the car starting?

[Ozark Lee]

Does this somehow effect timing of spark? Fuel delivery? Why would this effect the car starting?

Yes.

As I understand the way the internal code is written the camshaft position sensor is the primary determinate of when to trigger the coil and when to pulse the injectors. It works in tandem with the crankshaft position sensor but the crankshaft position sensor acts more as watchdog. The camshaft error code is set after the car starts and the camshaft position signal and the crankshaft position signal disagree.

I can't remember where I read that, whether it was in actual Volvo documents or if it was in an informative post - if it was the latter it could be totally wrong. I do know that my cars with a Motronic 4.3 will not run if I unplug the camshaft position sensor.

...Lee