Question about 1994 Volvo 850

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Sometimes won't start after warmed-up. Now very hard to start.

I have a 1994 Volvo 850 sedan non-turbo.

Lately, sometimes after engine was warmed up, it wouldn't restart. Sometimes it would stall and not want to restart, unless it sat for some time. Now, it is very difficult to get started.

I replaced the air and fuel filter. Old fuel filter had fuel in it, when removed. I checked new fuel filter, after trying to start, and didn't get any fuel out of it. When key is turned on, I don't sense any motor sounds coming from fuel pump. Should I?

I do have spark at coil and spark plug wires.

Please advise.

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  • 35 Answers

Hey Rob!
I can almost guarantee you that your problem is the infamous fuel pump relay. Open the hood and remove the fuse box cover (4 torx screws) to gain access to the relays. One of the relays is probably a green one marked 103. If so it needs to be replaced with a red, improved version. If it's not the relay the problem is probably the pump itself. Here's a link to some useful info on the relay and fuel pump: http://www.volvo-forums.com/index.php?showtopic=15505&st=80&p=80586&#entry80586

You should also check for spark when the problem is present. No spark could indicate faulty coil, camshaft position sensor or crankshaft position sensor. Checking a plug for spark is easy: Unscrew the plug and hold it to ground with a pair of insulated pliers or something similar while the problem is present. Have someone crank the engine while you look for spark. Should the engine start while lacking one plug it will sound horrible, but will not be harmed as long as you don't run it too long and don't rev it.

Good luck!

Posted on Jun 27, 2009

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Technopro
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SOURCE: 1995 volvo 850 turbo sedan,tested with OBDII,gave

Did you replace hoses to eliminate the codes?? Try checking all the fuses for a start then check for any ignition sparks then try to listen to the fuel pump activation on IGN and STRT as well just try to go step by step and eliinate the different components as you go. Good luck.

Posted on Mar 21, 2009

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SOURCE: how do i reset the radio code in a volvo 850 glt sedan 1996

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Posted on May 21, 2009

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SOURCE: VOLVO 850 RADIO/CD REPLACEMENT

Yes, its simply to remove the radio wich is there (two clamps, one on each side) retract the connectors.
You might need to buy a compartment to conceal the part of the opening that will be exposed when removing the bigfront-radio.
(Volvo-dealers can help you) And a cableset wich contains the connectors to the Radio-connectors in the 850 and directly to the radio you buy. (Most radio-dealers hava all kinds)

New radio mounts in only e few hours. All included.
Theese Volvos are very well prepeared for this.

Posted on Jul 20, 2009

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SOURCE: looking for 1995 volvo 850 turbo vacuum line schematic diagram

This is for a 98 T5, but it should be close enough. http://www.matthewsvolvosite.com/forums/viewtopic.php?p=93956#p93956

Posted on Oct 20, 2009

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SOURCE: Where is fuel filter on 1998 Volvo S70 non turbo?

the fuel filter is located underneath the rear passenger seat next to the canister box (the canister looks more like an air filter box housing. All you need is an 1/2 inch key to loosen one screw and pull on one end of the hose/tube to release it from the fuel filter. Pull opposite the unit. your best solution is to look to buy it on line so you have an idea as to what you are looking for then check against the info provided to you. I just did mine 15 mins. next to the rear tire. You will need to jack up the rear tire for easy access

Posted on Dec 30, 2011

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