1999 V70 Stalling

pumpkin3198 · Feb 4th, 2017, 10:08

Hey guys, new to the forum!

I'm posting here because I have a major electrical issue that's been ongoing for over 4 months now and still cannot seem to work out the root cause.

A couple of months ago, my V70 was running flawlessly until one day I experienced a little power loss, nothing major, she picked back up and everything was normal after that. Some time went on and the issue started to get worse, beginning with more frequent power loss followed by the car completely stalling and starving of fuel.

I've narrowed it down to the "main relay/engine system" relay which is located in the main fuse box. After about 10 minutes or more of running (depending on climate conditions) the relay will get super hot and burn out, I've replaced this relay about 4 times - same result.

The car does still start and will continue to run before the relay gets hot, at that point I take it out to prevent cooking it.

I've searched through forums and web pages and can't find much.

Any help will be much appreciated!

Thanks in advance!

Ben

SteveSarre · Feb 4th, 2017, 10:57

Hi Ben

Not sure, but suggest that you carry a spare relay just in case. (Maybe you already do that). Get one from a scrapyard.

Maybe the fuel pump is drawing too much current. Is the fuel pump circuit covered by a fuse? If so, check that the fuse that is present matches the fuse rating indicated on the fuse covers.
Someone may have put in a heavier fuse in the past.

If you have the right kind of meter, measure the current that is being drawn.

If you give more precise details (year and model etc) of your car, someone else may be able to give more help.

Changing the fuel pump is not that hard (remove cargo boards in the rear, remove a cover plate, undo a retaining ring (need to buy a special tool or improvise) and disconnect two fuel lines). Practice in the scrapyard. OK to put in a known good used pump if you want to save money and establish the problem.

HTH
Steve

PS
I suppose it might be worth changing the fuel filter if it hasn't been changed in a while. If it is very blocked maybe that is putting extra load on the pump. I am not sure.

SteveSarre · Feb 5th, 2017, 09:59

PS

When you turn the ignition on, but not start the car, does the fuel pump run for a second or two then stop?

If it doesn't stop (which it should), maybe something is wrong which then causes the pump to run continuously which might then burn out the relay?

Feb 4th, 2017, 10:08	#1
pumpkin3198 New Member Last Online: Feb 4th, 2017 11:59 Join Date: Feb 2017 Location: Sydney, Australia	1999 V70 Stalling Hey guys, new to the forum! I'm posting here because I have a major electrical issue that's been ongoing for over 4 months now and still cannot seem to work out the root cause. A couple of months ago, my V70 was running flawlessly until one day I experienced a little power loss, nothing major, she picked back up and everything was normal after that. Some time went on and the issue started to get worse, beginning with more frequent power loss followed by the car completely stalling and starving of fuel. I've narrowed it down to the "main relay/engine system" relay which is located in the main fuse box. After about 10 minutes or more of running (depending on climate conditions) the relay will get super hot and burn out, I've replaced this relay about 4 times - same result. The car does still start and will continue to run before the relay gets hot, at that point I take it out to prevent cooking it. I've searched through forums and web pages and can't find much. Any help will be much appreciated! Thanks in advance! Ben

Feb 4th, 2017, 10:57	#2
SteveSarre Premier Member Last Online: Yesterday 19:44 Join Date: Oct 2004 Location: London/West Country	Hi Ben Not sure, but suggest that you carry a spare relay just in case. (Maybe you already do that). Get one from a scrapyard. Maybe the fuel pump is drawing too much current. Is the fuel pump circuit covered by a fuse? If so, check that the fuse that is present matches the fuse rating indicated on the fuse covers. Someone may have put in a heavier fuse in the past. If you have the right kind of meter, measure the current that is being drawn. If you give more precise details (year and model etc) of your car, someone else may be able to give more help. Changing the fuel pump is not that hard (remove cargo boards in the rear, remove a cover plate, undo a retaining ring (need to buy a special tool or improvise) and disconnect two fuel lines). Practice in the scrapyard. OK to put in a known good used pump if you want to save money and establish the problem. HTH Steve PS I suppose it might be worth changing the fuel filter if it hasn't been changed in a while. If it is very blocked maybe that is putting extra load on the pump. I am not sure. __________________ V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped) Last edited by SteveSarre; Feb 4th, 2017 at 11:39.

Feb 5th, 2017, 09:59	#3
SteveSarre Premier Member Last Online: Yesterday 19:44 Join Date: Oct 2004 Location: London/West Country	PS When you turn the ignition on, but not start the car, does the fuel pump run for a second or two then stop? If it doesn't stop (which it should), maybe something is wrong which then causes the pump to run continuously which might then burn out the relay? __________________ V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped)

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