I have a ’94 Volvo 850 and a while ago it started stalling. It has a
bit of a rough idle that has improved a little with non-ethanol fuel
and fuel injector cleaner. I honestly don’t know if that is related
to the main problem.
The main problem is the stalling. Sometimes, it will just stall when
I’m stopped at a light. Sometimes, it will stall when I’m going 30
miles an hour. Sometimes, it will stall when I’m going 70 miles an
hour. Typically, when it stalls at slower speeds or at the light, it
just dies straight away. When it dies at higher speeds, the first
thing I notice is "hitch" or a "bump" sensation at which point the
engine stops responding to depression of the accelerator pedal. The
engine continues to run for a few seconds as I roll along. The
tachometer slowly falls and then the engine dies.
There was a time when I could throw it into neutral and get it started
again before coming to a complete stop from highway speed, but those
days are gone. It seems that it is taking longer and longer to get it
restarted. The car has to have the key in the off position for a
minimum of 10-15 seconds before it will even have a chance to restart.
Lately, after about 30 seconds to a minute it will restart very
briefly and then immediately die. If I’m patient and wait a bit
longer it will restart like normal, but it seems more likely to die
again if I don’t wait a generous amount of time.
This problem seems to very rarely occur during long trips, but I can’t
tell if that is relevant or just secondary to the fact that I take I
take relatively few long trips. Of course, if it were completely
random it should occur more often during these 5 hour trips since it
seems to happen so often on the shorter trips.
It’s been to the mechanic at least twice for this problem. The
mechanics say that the car is not displaying any "codes." They
replaced the fuel filter the first time without improvement. The
second time, it was in for other things too and they were unable to
"recreate" the stalling despite driving it for 40 miles. They said
that without any codes or being able to recreate the stall, they
didn’t want to just "do something."
I’ve read some posts from people with similar cars and problems.
Seems like the things that come up most often are the fuel pump, fuel
relay, and oxygen sensor. However, only the fuel pump and fuel relay
seem to be mentioned when there are no codes. Is that at all
accurate? Do the symptoms the car is having seem more compatible with
the fuel relay or the fuel pump or something else entirely. I haven’t
tried to "listen" for the fuel pump when it happens before, would
that be likely to help?
Thanks a ton for any help.
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