850 stalls once at running engine temp.

rmmartel · Post by **rmmartel** » 07 Mar 2006, 20:04

Can anyone help me please. My 850 acts like it is not getting fuel once the engine is at running temp.
I have replaced the fuel filter, fuel pump, idle control valve, and mass air flow sensor. I am at wits end. I really want to get her on the road again. It has been a great car till last week.

sailboy33 · Post by **sailboy33** » 08 Mar 2006, 09:05

did you replace the relay switch? located under the fuse box, read the engine stall thread seem's the switch is a high percentage of the problem
just replaced mine yesterday after having stall/start issues instant fix

rmmartel · Post by **rmmartel** » 08 Mar 2006, 12:32

thanks, I will switch it tomorrow and let you know,

rmmartel · Post by **rmmartel** » 08 Mar 2006, 12:41

hello sail boy,
which relay do I replace.
There are the two long rectangular ones taking two slots.
the 3 smaller black one against the fuse rail and the pink one between the two large ones taking two slots.

White850Turbo · Post by **White850Turbo** » 08 Mar 2006, 12:58

IIRC, it's the red one. Should be near the top. It should be marked "fuel pump relay" or something to that effect.

rmmartel · Post by **rmmartel** » 08 Mar 2006, 13:14

white850
You da man,
pulled it out and right on side, said puel0pump controller.
I will run over to volvo and get another one and see it that does the trick.

rmmartel · Post by **rmmartel** » 15 Mar 2006, 17:09

HELP, I have replaced the fuel pump relay, $130bucks and no change.
cleaned the FT. and car runs great till normal engine temp.
If I give it light gas. it will run, but if I put too much pressure on the gas, then the car sounds like it is starving for fuel and engine quits. I will not restart till engine cools a bit. I am not sure what else to do.
I have done everything except the O2 sensor and the cam sensor.
does any one have an idea.
Thanks,
desperate volvo driver.

rmmartel · Post by **rmmartel** » 20 Mar 2006, 18:20

Hello,
going to try the two above parts and see if it corrects my issue.
can any one help.

Post by **matthew1** » 20 Mar 2006, 21:57

Vacuum lines? In an unlikely scenario the engine could be heating the lines up to a temp where a crack or cracked elbow gets large enough to introduce extra air into the mix. A guess.

White850Turbo · Post by **White850Turbo** » 21 Mar 2006, 13:13

rmmartel wrote:HELP, I have replaced the fuel pump relay, $130bucks and no change.
cleaned the FT. and car runs great till normal engine temp.
If I give it light gas. it will run, but if I put too much pressure on the gas, then the car sounds like it is starving for fuel and engine quits. I will not restart till engine cools a bit. I am not sure what else to do.
I have done everything except the O2 sensor and the cam sensor.
does any one have an idea.
Thanks,
desperate volvo driver.

They charged you $130 for a fuel pump relay?!?!

. It should run half that price, even at the dealer. I'd stay away from there. At least it's taken care of though so you don't have to worry about it failing again.

I agree with Matthew on the grounds that heavy throttle pressure is what kills it. Especially take a good look at the vacuum elbow on the passenger side of the intake manifold (assuming this is a turbo model).