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Official Engine Stalling Thread

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

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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bills '94 850
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Official Engine Stalling Thread

Post by bills '94 850 » Tue Mar 29, 2005 5:03 pm

[edit] If you've never read this thread, take the time right now to read the whole thing. If you post a question to this thread that has been answered in this thread, I will remove your post. Thanks -- Matt [/edit]

[edit] the title of this thread was 850 engine cut out- Need Matthew's Support. Changed on 29/4/2005. Thanks -- Matt [/edit]

:( there are alot of 850's that seem to have this cut out problem. I have the same in mine and haven't found the cause. Same tech tip-have to have the car in motion and wait till it stops before being able to diagnose it. I agree it is really dangerous.
Has anyone found the cause definitely????
Can Matthew the administrator collect from us members who have all the similar probs and take it to the Volvo Engineers? That would be good wouldn't it. Is there a portable instrument gauge that reveals the problem codes while driving? instead of sitting in a workshop?



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matthew1
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Post by matthew1 » Tue Mar 29, 2005 7:42 pm

I will "sticky" this post for a few weeks, and if it gets many "me too's" I'll make a page -- something more permanent.

As far as the stalling problem, does anyone have insight into if there is a usual suspect to it? I've read that a new fuel pump has fixed this.

As far as codes go, most OBDII-compliant vehicles will transmit data in real time via the port under the ash tray. The problem for you is you need a 1996 or newer Volvo to have OBDII. I don't know of any way to get data in real time from pre-OBDII cars.


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1997 850 T5, MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace [gone]
2004 V70 R [gone]

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Post by lxt » Wed Mar 30, 2005 2:31 pm

Nothing much to say, just want to add a "me too" to the thread.

To help make a collective conclusion on this, I think we should define the symptoms (if it's different it might be entirely somethin else), and also how many times/how often it happened, the cause/fix if any. I'll suggest the definition as: "car stalls while driving. Restart and drive ok" (until the next stall).

Now, for me:
How many times: 1
Fix/cause: none
Codes/other special circumstances: none



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Post by tina » Wed Mar 30, 2005 3:18 pm

HAVE you replaced the fuel pump (and/or fuel pump relays)?

I replaced fuel pump last year after my '94 850 stalled out in traffic. (It later started again then stalled etc. limped it to the garage) Yes the fuel pump was the problem.

There could be many causes for stalling including O2 sensors etc. Surely yuor mechanic can diagnose whether fuel is getting interrupted to the engine after a stall? Have it towed to the garage and have them look at it right after a stall...



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stalling

Post by dosbricks » Wed Mar 30, 2005 6:25 pm

Tina may have hit on a diagnostic point here. If the car stalls and you shut the ignition off and don't try to restart it, but instead loosen the connection at the fuel rail.... if no gas spews out, then likely fuel pump problem.

Normally the fuel system is pressured all the time whether the car is running or not.

By the way, this would mean taking care not to get any gas on the hot exhaust.

Just throwing in my 2 cents. :?


'98 S70, 230k, purchased new in '98
'96 855 GLT, 163k, purchased lightly used in '99
Onceuponatime RIP '69 Shelby GT500 w/7.0 liter

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Post by 8fiddy » Sat Apr 02, 2005 6:45 pm

FYI my 94 has OBDII, i haven't used it yet but I hear Volvo got anxious and started putting it in the early cars, actually mine might have OBDI and II. It says OBDII Certified on the Emissions sticker on the pssngr strut tower. I also heard that the early models with OBDII that it was only for engine diagnotics.


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Post by bills '94 850 » Sun Apr 03, 2005 4:52 pm

Looking at Tina's comment. I have changed the fuel pump relay and still no fix. I will now try changing the fuel pump, and do a check on the fuel rail to see if there is pressure. I hope there is, I'll probably splatter some on the exhaust to give a final fix to the car. It's so maddening and frustrating.
I've heard there are 2 fuel pumps. Is this so?



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Post by jaljamma » Sun Apr 03, 2005 6:24 pm

The butterfly in the throttle valve is pre-set at the factory to a very small gap, and with time and mileage there is a build up of oil and carbon which reduces the gap enough to send wrong information to the engine management system. The butterfly needs simply to be cleaned and the gap checked. Volvo dealerships are aware of this.

I found this information while surfing a UK Volvo site

http://www.volvoclub.org.uk/850reg.htm

Good luck.


Jouhar

1997 850 T5

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Re: 850 engine cut out- Need Matthew's Support

Post by RKC of Kenginston » Wed Apr 06, 2005 7:02 pm

This is a me-too reply.

My 93 860 5 speed manual (just over 100K mile) had this problem since last July. It would stall when pulling to a stop light but I could away restart after waiting for more than 30 seconds. Replacing the fuel pump relay and idling sensor did not help. The mechanics at my local dealership drove the car for two weeks and it did not happen to him. The service manager thinks that I am imaging the whole thing up. Until two weeks ago, the engine did not fail during freeway driving. The first time it occur while driving at 65 mph was quit unnerving. But the interesting thing was that the engine did not completely die. It just lost power. By keeping the accelerator down, the engine recovered after about 30 sec.

I suspect this to be a electrical problem as the car has a lot of phantom warning signs (i.e. imtermittent low oil light flashing and failed breaklight indicator on when the bulb is good etc). It tends to occur when the A/C and temperature auto are both on and also after the car has been idling for a while.



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stall then restart

Post by dosbricks » Wed Apr 06, 2005 7:40 pm

http://www.matthewsvolvosite.com/chat/p ... highlight=

Something else to look into if fuel pump is not the culprit.


'98 S70, 230k, purchased new in '98
'96 855 GLT, 163k, purchased lightly used in '99
Onceuponatime RIP '69 Shelby GT500 w/7.0 liter

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