General: 850: - Turning over indefinitely

ACJJ619 · Dec 17th, 2018, 22:00

Hello all!

I recently bought an 850r manual estate - my first foray into Volvo's!

Unfortunately it's decided not to start any more.

I've used it almost daily for four weeks and in that time it's failed to start a few times, turning over seemingly indefinitely but never actually firing. The first time, I returned a few hours later to try again and it started first time. The next two times I simply got out the car, locked and unlocked the doors a couple of times, and it fired.

This time however, no such luck.

The only other symptom I've noticed (when it's working!) is some throttle hesitation when cold, but unsure if this could be related. It feels as if there are some flat spots in the throttle at lower speeds, something I'd probably attribute to a sensor issue on my BMW E30 but I'm not sure how much BMW knowledge I can transfer over to the wagon. Were it my BMW, I'd probably be looking at cam/crank sensor issues.

Relevant info: The car was with its previous owner for five years and never failed to start, which I trust. It was also recently serviced including spark plugs and PCV.

Any ideas would be appreciated

Cookeh · Dec 18th, 2018, 00:36

Crank position sensor?

ACJJ619 · Dec 18th, 2018, 08:06

Quote:

Originally Posted by Cookeh

Crank position sensor?

That's one of my first thoughts. I can test that with a code reader and multimeter so that seems a quick and easy place to start. Assuming I can get VOL-FCR working on the laptop. Code reading software/hardware is never as straightforward as it seems!

Luxobarge · Dec 18th, 2018, 09:04

CPS is definitely a possible, but it's not a common fault on these. Much more common is the contacts to the antenna ring around the ignition switch, which picks up the signal to disable the immobiliser.

I know I'd be looking at this first, as if this is the fault you won't see a signal on the CPS and will be led to believe that's the problem when it isn't - if that makes sense?

Cheers!

ACJJ619 · Dec 18th, 2018, 09:20

Quote:

Originally Posted by Luxobarge

CPS is definitely a possible, but it's not a common fault on these. Much more common is the contacts to the antenna ring around the ignition switch, which picks up the signal to disable the immobiliser.

I know I'd be looking at this first, as if this is the fault you won't see a signal on the CPS and will be led to believe that's the problem when it isn't - if that makes sense?

Cheers!

Thanks. How would I check the contacts?

Would you immobiliser allow the engine to turn over or would it do nothing at all?

Simmy · Dec 18th, 2018, 11:37

Quote:

Originally Posted by ACJJ619

Hello all!

I recently bought an 850r manual estate - my first foray into Volvo's!

Unfortunately it's decided not to start any more.

I've used it almost daily for four weeks and in that time it's failed to start a few times, turning over seemingly indefinitely but never actually firing. The first time, I returned a few hours later to try again and it started first time. The next two times I simply got out the car, locked and unlocked the doors a couple of times, and it fired.

This time however, no such luck.

The only other symptom I've noticed (when it's working!) is some throttle hesitation when cold, but unsure if this could be related. It feels as if there are some flat spots in the throttle at lower speeds, something I'd probably attribute to a sensor issue on my BMW E30 but I'm not sure how much BMW knowledge I can transfer over to the wagon. Were it my BMW, I'd probably be looking at cam/crank sensor issues.

Relevant info: The car was with its previous owner for five years and never failed to start, which I trust. It was also recently serviced including spark plugs and PCV.

Any ideas would be appreciated

try the cam position sensor . it can be checked with a multi meter

DaveNP · Dec 18th, 2018, 14:52

Quote:

Originally Posted by ACJJ619

Thanks. How would I check the contacts?

Would you immobiliser allow the engine to turn over or would it do nothing at all?

When I had a problem with the immobilier antenna ring the car would turn over and fire but die immediately, not keep turning over without firing. The common fault with the immobiliser ring is the contact of the plug to the ring, often improved just by unplugging and plugging back in a few times to clean the contacts.

volvo2 · Dec 18th, 2018, 16:52

Not sure how old your car is but just for information - not all 850s have the ignition immobiliser. Mine, a 1994 850, does not have this.

ACJJ619 · Dec 18th, 2018, 17:28

Thanks for the replies all.

Mine is a 97.

EDIT: Weird. Just tried it again and it started first time. I think I'll leave it on the drive until I've diagnosed something!

The Edge · Dec 18th, 2018, 18:46

Quote:

Originally Posted by ACJJ619

Thanks for the replies all.

Mine is a 97.

EDIT: Weird. Just tried it again and it started first time. I think I'll leave it on the drive until I've diagnosed something!

fuel pump relay?

Dec 17th, 2018, 22:00	#1
ACJJ619 Junior Member Last Online: Jul 6th, 2020 09:39 Join Date: Aug 2018 Location: Reading	Turning over indefinitely Hello all! I recently bought an 850r manual estate - my first foray into Volvo's! Unfortunately it's decided not to start any more. I've used it almost daily for four weeks and in that time it's failed to start a few times, turning over seemingly indefinitely but never actually firing. The first time, I returned a few hours later to try again and it started first time. The next two times I simply got out the car, locked and unlocked the doors a couple of times, and it fired. This time however, no such luck. The only other symptom I've noticed (when it's working!) is some throttle hesitation when cold, but unsure if this could be related. It feels as if there are some flat spots in the throttle at lower speeds, something I'd probably attribute to a sensor issue on my BMW E30 but I'm not sure how much BMW knowledge I can transfer over to the wagon. Were it my BMW, I'd probably be looking at cam/crank sensor issues. Relevant info: The car was with its previous owner for five years and never failed to start, which I trust. It was also recently serviced including spark plugs and PCV. Any ideas would be appreciated

Dec 18th, 2018, 00:36	#2
Cookeh Premier Member Last Online: Sep 14th, 2022 17:04 Join Date: Jan 2018 Location: Derbyshire	Crank position sensor? __________________ 1995 Volvo 850 T5 Estate (Manual)

Dec 18th, 2018, 09:04	#4
Luxobarge Premier Member Last Online: Today 14:49 Join Date: Jan 2011 Location: Horne (Nr. Horley)	CPS is definitely a possible, but it's not a common fault on these. Much more common is the contacts to the antenna ring around the ignition switch, which picks up the signal to disable the immobiliser. I know I'd be looking at this first, as if this is the fault you won't see a signal on the CPS and will be led to believe that's the problem when it isn't - if that makes sense? Cheers! __________________ Some people are like Slinkies, they serve no useful purpose but they still bring a smile to your face when you push them downstairs.

Dec 18th, 2018, 17:28	#9
ACJJ619 Junior Member Last Online: Jul 6th, 2020 09:39 Join Date: Aug 2018 Location: Reading	Thanks for the replies all. Mine is a 97. EDIT: Weird. Just tried it again and it started first time. I think I'll leave it on the drive until I've diagnosed something! Last edited by ACJJ619; Dec 18th, 2018 at 17:59.

Dec 18th, 2018, 16:52	#8
volvo2 Master Member Last Online: Apr 16th, 2024 12:25 Join Date: Nov 2001 Location: Evesham	Not sure how old your car is but just for information - not all 850s have the ignition immobiliser. Mine, a 1994 850, does not have this.

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