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Won't Start - Fuel injection Problem

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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kk5zc
Posts: 10
Joined: 15 October 2005
Year and Model: 1995 850 Turbo
Location: AR

Re: Won't Start - Fuel injection Problem Help Needed

Post by kk5zc »

It is reading 12.1V. Yesterday, when I mentioned it seemed a little low, it was 11.8V.

I have pulled the ECU and reseated. That must have reset something because my OBD led light no longer dimly glows. I pulled the codes and reset.

At this point, everything seems to be back to normal. I haven't driven it yet, but it starts and runs. The fuel relay is no longer making the noise that it was making.

Bobby
1995 850 Turbo - 233,000 miles 12/31/2010

precopster
Posts: 7543
Joined: 21 August 2010
Year and Model: Lots
Location: Melbourne Australia
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Post by precopster »

Corrosion is a fault finders worst friend because it can strike anywhere at any time.

Fortunately your persistence has paid off.

When the relay was still clicking when directly connected to the battery I thought it was time for you to get a new relay.

If it weren't for the dimly lit OBD LED I guess you wouldn't have much to go on.
Current cars VW Transporter 2.5TDI, 2010 XC90 D5 R Design

kk5zc
Posts: 10
Joined: 15 October 2005
Year and Model: 1995 850 Turbo
Location: AR

Post by kk5zc »

This problem has returned. I've done all of the same checks and still no solution. I am not getting power to the wire on the connector that should have power to trigger the relay. When I jump this wire to the battery, the relay clicks on and the car will start. Another issue worth mentioning is that I can't read the DTC codes. However, if I energize the relay wire, I can check the DTC codes. It seems as though the ECM is powering up when I energize this wire. Also other components on the engine start making sounds as well.

Can anyone tell me where the power is coming from for this relay wire?

Thanks for the help.

Bobby
1995 850 Turbo - 233,000 miles 12/31/2010

Aphx02
Posts: 10
Joined: 2 August 2018
Year and Model: 1998 V70 T5
Location: California
Has thanked: 13 times

Post by Aphx02 »

Any updates on how this was resolved? I have the same situation with my Son's '96 850.

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