Dead fuel pump relay? - dead car!! - Page 4

Steve940estate · Jul 4th, 2011, 19:51

I had a phone call from a friend today about a misbehaving Volvo. He is friendly with a garage owner who was having trouble with a car and wondered if I had any similar problems. It was at one stage cutting out for no reason. Checking through a few things they found it could be stopped by flexing the crank sensor wires. They fitted a new one but seem to have other problems with the car now but at least it doesn't just cut out like it did.

Dr. Rog · Jul 4th, 2011, 22:27

IT WORKS

Hooray
Thanks for the help guys, you saved me some cash.
Its so easy to fit but very expensive, £28.26+VAT with VOC discount. The relay was £30 all in. Both from Fawcetts of Newbury who ordered it this morning and had it this afternoon. Simon in "service" told me the resistance was 250 Ohm (ish) and therefore I felt fine ordering the part.

I recommend anyone with a 940 gets a crank sensor and pump relay to carry about with them. Get cheap aftermarket parts if you want, as long as it works you get where you need to be, (you need a no 2 cross head and a 10mm spanner off course.)

I have had each go on separate cars, each time the AA man thought it was the other part. Had I the spares it would have taken minutes to fix and avoided some serious (painfully serious) disruption. There are other things that go, but having these parts reduces the odds and especially the confusion.

I (might) have pics but I need to install the camera driver. I think a separate thread would help summarise.

BillB · Jul 4th, 2011, 22:59

I haven't been on the forum for a day or two or I would have told you it was almost certainly the RPM sensor - a known fail item after about 150k so shoud be changed anyway. The problem is that they fail gradually so you measure it's voltage output one instant and it would be OK then the engine would die a second later. Regard it as a maintenance item. Regards.

rogerthechorister · Jul 5th, 2011, 01:29

Well my B234F played up coming home tonight. I thought it was the fuel pump relay at first, but I could hear the fuel pump start pumping when I turned on so it wasn't that. RAC man found good spark - and while he was looking for a good earth to test the plug leads against, nudged a little relay attached to the strap round the header tank and she fired! Unplug, tighten connectors, WD40, and sang home like a bird. I think that must be the "radio suppression relay".

OldBlueVolvo · Jul 5th, 2011, 12:52

Hi Dr. Rog, can I ask what mileage your crank sensor has failed at?

Oilydad · Jul 5th, 2011, 13:02

Mine has just failed as well, and is being replaced tomorrow. See my thread in the 900 section.

Mileage is around 160,000 so I wonder if we are in for a spate of these things going.

Good advice from Dr Rog and Bill B. Although unlikely another one will go, I'm going to source out an aftermarket one and stick in in my box of bits ( a plug, an injector, an ht lead, etc) in the car. The hassle we had getting back from Stansted last weekend was really a complete PITA ending in a full recovery back here to Exeter, and still running into this week with lifts to work having to be organised etc.

Trouble is, you can drive round with a decent set of tools to deal with emergencies, as I do usually, and in most cases make some form of temporary repair to keep moving. But if something like this fails then you are completely knackered. For the sake of a few quid, I'm playing safe.

Steve940estate · Jul 5th, 2011, 16:40

Glad to hear it goes again. I wonder if it's age rather than the amount of miles it's done. My car had the non starting problem at a lot less than what others have experienced. I have always been slightly suspicious of the mileage of my car in it's original guise, it had 49,000 on it when I bought it.
There is a chance it wasn't the crank sensor though as I changed it and the injector relay at the same time.

Could the short spell of warm weather finished a few of them off perhaps ?

Dr. Rog · Jul 5th, 2011, 17:42

Quote:

Originally Posted by OldBlueVolvo

Hi Dr. Rog, can I ask what mileage your crank sensor has failed at?

180,800 or near enough. 1996 registered car

The old one has a little cracking in the insulation around the end of the sensor. It would appear that a little bit of perishing of the insulation, fatigue of the copper wire and bob's your uncle - dead car.

If you get yours off and is got the slightest crack its on its way I would suggest.

Also the car has been sluggish pulling away recently, I notice this as I have to pull away across a busy and very dangerous junction every morning. But this morning it was noticeably quicker. I think some indeterminacy was creeping in there.

Dr. Rog · Jul 5th, 2011, 18:28

Quote:

Originally Posted by Steve940estate

Glad to hear it goes again. I wonder if it's age rather than the amount of miles it's done. My car had the non starting problem at a lot less than what others have experienced. I have always been slightly suspicious of the mileage of my car in it's original guise, it had 49,000 on it when I bought it.
There is a chance it wasn't the crank sensor though as I changed it and the injector relay at the same time.

Could the short spell of warm weather finished a few of them off perhaps ?

Rubbers and plastics age, copper fatigues (becomes brittle with being flexed), PCBs get acid erosion off the flux, both time and quantity of flux dependant.
However how the item is fitted matters, pulling it tight can't help.

Jul 4th, 2011, 22:27	#32
Dr. Rog Master Member Last Online: Oct 21st, 2017 22:15 Join Date: Aug 2010 Location: Kingsclere	S u c c e s s IT WORKS Hooray Thanks for the help guys, you saved me some cash. Its so easy to fit but very expensive, £28.26+VAT with VOC discount. The relay was £30 all in. Both from Fawcetts of Newbury who ordered it this morning and had it this afternoon. Simon in "service" told me the resistance was 250 Ohm (ish) and therefore I felt fine ordering the part. I recommend anyone with a 940 gets a crank sensor and pump relay to carry about with them. Get cheap aftermarket parts if you want, as long as it works you get where you need to be, (you need a no 2 cross head and a 10mm spanner off course.) I have had each go on separate cars, each time the AA man thought it was the other part. Had I the spares it would have taken minutes to fix and avoided some serious (painfully serious) disruption. There are other things that go, but having these parts reduces the odds and especially the confusion. I (might) have pics but I need to install the camera driver. I think a separate thread would help summarise. __________________ Cheers Rog Previously owned 1996 940 SE auto and GLE manual, both B230FK estates.

Jul 5th, 2011, 01:29	#34
rogerthechorister Rogerthechorister Last Online: Dec 16th, 2023 02:15 Join Date: May 2006 Location: Rochester	Coming out in sympathy Well my B234F played up coming home tonight. I thought it was the fuel pump relay at first, but I could hear the fuel pump start pumping when I turned on so it wasn't that. RAC man found good spark - and while he was looking for a good earth to test the plug leads against, nudged a little relay attached to the strap round the header tank and she fired! Unplug, tighten connectors, WD40, and sang home like a bird. I think that must be the "radio suppression relay".

Jul 5th, 2011, 12:52	#35
OldBlueVolvo VOC Member Last Online: May 4th, 2023 20:38 Join Date: Nov 2007 Location: West Sussex	Hi Dr. Rog, can I ask what mileage your crank sensor has failed at? __________________ William 745 GL - 1986, B230K 745 GLE - 1987, B230E

Jul 5th, 2011, 13:02	#36
Oilydad Premier Member Last Online: Mar 21st, 2016 21:21 Join Date: Aug 2009 Location: Exeter Devon	Mine has just failed as well, and is being replaced tomorrow. See my thread in the 900 section. Mileage is around 160,000 so I wonder if we are in for a spate of these things going. Good advice from Dr Rog and Bill B. Although unlikely another one will go, I'm going to source out an aftermarket one and stick in in my box of bits ( a plug, an injector, an ht lead, etc) in the car. The hassle we had getting back from Stansted last weekend was really a complete PITA ending in a full recovery back here to Exeter, and still running into this week with lifts to work having to be organised etc. Trouble is, you can drive round with a decent set of tools to deal with emergencies, as I do usually, and in most cases make some form of temporary repair to keep moving. But if something like this fails then you are completely knackered. For the sake of a few quid, I'm playing safe. __________________ Are We Nearly There Yet! No longer a VOLVO owner, not by choice, but 'cause they don't make proper Volvos any more! Last edited by Oilydad; Jul 5th, 2011 at 13:29.

Jul 4th, 2011, 19:51	#31
Steve940estate Steam Driven PC Owner. Last Online: Mar 4th, 2024 23:50 Join Date: Dec 2004 Location: Not sure.	I had a phone call from a friend today about a misbehaving Volvo. He is friendly with a garage owner who was having trouble with a car and wondered if I had any similar problems. It was at one stage cutting out for no reason. Checking through a few things they found it could be stopped by flexing the crank sensor wires. They fitted a new one but seem to have other problems with the car now but at least it doesn't just cut out like it did.

Jul 4th, 2011, 22:59	#33
BillB VOC Member Last Online: Apr 24th, 2024 13:58 Join Date: Dec 2002 Location: Bristol	I haven't been on the forum for a day or two or I would have told you it was almost certainly the RPM sensor - a known fail item after about 150k so shoud be changed anyway. The problem is that they fail gradually so you measure it's voltage output one instant and it would be OK then the engine would die a second later. Regard it as a maintenance item. Regards.

Jul 5th, 2011, 16:40	#37
Steve940estate Steam Driven PC Owner. Last Online: Mar 4th, 2024 23:50 Join Date: Dec 2004 Location: Not sure.	Glad to hear it goes again. I wonder if it's age rather than the amount of miles it's done. My car had the non starting problem at a lot less than what others have experienced. I have always been slightly suspicious of the mileage of my car in it's original guise, it had 49,000 on it when I bought it. There is a chance it wasn't the crank sensor though as I changed it and the injector relay at the same time. Could the short spell of warm weather finished a few of them off perhaps ?

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