Any Ideas what's wrong?

I have a '91 740 Turbo wagon. Mileage is under 40K.
Twice in the last four months when I applied a heavy foot to the gas to pass a slow car I lose power. Completely! The engine does not run. One instance, I was able to eventually restart the motor,and limp home but it kept dying. The first I had to have it towed in, and the mechanic claimed it was fixed but obviously that is not the case.
Help! Anyone else experience this same phenomena?

Thanks.
Almost stranded in Dallas

 

I wouldn't call this a phenomena.

You must observe exactly what is happening, you may have to systematically go through many tests, fuel pressure, check for vacuum leaks, check plugs, wires, cap, rotor, coil, etc.... ECU.

If it seem quite intermittent, it may be difficult to diagnose, but if it starts getting worse, it may get to be quite obvious what the problem is. Some problems like this could be easily diagnosed on a chassis dyno if it happens quite often, you need a load, and a dyno is the only way to get one.

I'd try another qualified Volvo mechanic to give you a suggestion.

BTW: You shouldn't post to newsgroups in HTML, many news readers won't pick this up, and people may not see your post. Use text only.

--

Myron Samila
Toronto, ON Canada
Samila Racing
http://204.101.251.229/myronx19

 

Because there's more to the internet than hits alone, Myron Samila
wrote:

Doh!


--

Stewart Hargrave

I run on beans - laser beans


For email, replace 'SpamOnlyToHere' with my name

 

yeah,

I tried to reply to his post, and it kept saying mine was in HTML, and I didn't select it
that way.

hehe, oh well, Good old Outlook eh?

--
Myron Samila
Toronto, ON Canada
Samila Racing
http://204.101.251.229/myronx19

 

replace the fuel filter as a cheap and easy first try. Could be water in your fuel, also.
I have a '91 740 Turbo wagon. Mileage is under 40K.
Twice in the last four months when I applied a heavy foot to the gas to pass a slow car I lose power. Completely! The engine does not run. One instance, I was able to eventually restart the motor,and limp home but it kept dying. The first I had to have it towed in, and the mechanic claimed it was fixed but obviously that is not the case.
Help! Anyone else experience this same phenomena?

Thanks.
Almost stranded in Dallas

 

My '87 740 suffered from similar problems after changing the fuel
filter. Seems one of the banjo fittings twisted while being tightened
and crimped the fuel line. As long as fuel demand was relatively
constant, things were ok, but upon heavier acceleration, fuel
starvation occured, engine hesitated and at times stalled.

Gl,
Joe

 

My '85 DL did the same thing.

And I had the same experience with the mechanics at Smythe Volvo in San
Jose as you had with yours.

The problem turned out to be dirty contacts in the connector to the Air
Mass Meter.

I carefully unplugged the connector and sprayed Radio Shack TV Tuner
Cleaner into both parts of the connector. Then I plugged and unplugged
them together a few times (before leaving them plugged together).

JM