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Old 12-10-2005, 00:01   #1 (permalink)
James Sweet
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740T bucking when cold

After years of solid running, in the past few weeks my '87 740 Turbo has
had a strange intermittent problem when cold. Either right after it's
started or shortly after the engine will suddenly start idling very
poorly, RPM dips down to 300-500 RPM and stumbles for several seconds,
then it's fine. First time it happened I was pulling out into traffic
and the car lost all power, started bucking heavily and sputtering, then
suddenly roared to life with a spectacular burnout. The next time I was
coasting down my hill when it started stumbling so I pushed in the
clutch and coasted for a few moments until it recovered. Once it goes
back to normal it runs great for the rest of the day, haven't had any
other problems at all.

What do you guys think? I'm leaning towards the beginnings of problems
with the AMM, I'm afraid I might be chasing my tail trying to track this
one down since it happens relatively rarely. It really feels like a fuel
problem though.
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Old 12-10-2005, 03:01   #2 (permalink)
jg
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Re: 740T bucking when cold


"James Sweet" <jamessweet@hotmail.com> wrote in message
news:Ugvmf.1967$Jz6.1849@trnddc06...
> After years of solid running, in the past few weeks my '87 740 Turbo has
> had a strange intermittent problem when cold. Either right after it's
> started or shortly after the engine will suddenly start idling very
> poorly, RPM dips down to 300-500 RPM and stumbles for several seconds,
> then it's fine. First time it happened I was pulling out into traffic
> and the car lost all power, started bucking heavily and sputtering, then
> suddenly roared to life with a spectacular burnout. The next time I was
> coasting down my hill when it started stumbling so I pushed in the
> clutch and coasted for a few moments until it recovered. Once it goes
> back to normal it runs great for the rest of the day, haven't had any
> other problems at all.
>
> What do you guys think? I'm leaning towards the beginnings of problems
> with the AMM, I'm afraid I might be chasing my tail trying to track this
> one down since it happens relatively rarely. It really feels like a fuel
> problem though.


Distributor leads? That's what caused similar probs with mine, specially
when it rained.


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Old 12-10-2005, 12:01   #3 (permalink)
James Sweet
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Re: 740T bucking when cold


>
> Distributor leads? That's what caused similar probs with mine, specially
> when it rained.
>
>


I can check them, they're Magnecore wires though and only a couple years
old. Hasn't rained lately either. I haven't checked the distributor cap
lately though.
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Old 12-10-2005, 13:01   #4 (permalink)
Michael Pardee
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Re: 740T bucking when cold

"James Sweet" <jamessweet@hotmail.com> wrote in message
news:Ugvmf.1967$Jz6.1849@trnddc06...
> After years of solid running, in the past few weeks my '87 740 Turbo has
> had a strange intermittent problem when cold. Either right after it's
> started or shortly after the engine will suddenly start idling very
> poorly, RPM dips down to 300-500 RPM and stumbles for several seconds,
> then it's fine. First time it happened I was pulling out into traffic and
> the car lost all power, started bucking heavily and sputtering, then
> suddenly roared to life with a spectacular burnout. The next time I was
> coasting down my hill when it started stumbling so I pushed in the clutch
> and coasted for a few moments until it recovered. Once it goes back to
> normal it runs great for the rest of the day, haven't had any other
> problems at all.
>
> What do you guys think? I'm leaning towards the beginnings of problems
> with the AMM, I'm afraid I might be chasing my tail trying to track this
> one down since it happens relatively rarely. It really feels like a fuel
> problem though.


That is odd. How about the operation of the throttle position switch? Maybe
it's getting balky when cold and isn't coming out of idle mode. Listening
for the click with the engine off is a good start.

But it always could be the AMM/connector.

Mike


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Old 12-10-2005, 21:01   #5 (permalink)
James Sweet
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Re: 740T bucking when cold


>
> That is odd. How about the operation of the throttle position switch? Maybe
> it's getting balky when cold and isn't coming out of idle mode. Listening
> for the click with the engine off is a good start.
>
> But it always could be the AMM/connector.
>
> Mike
>
>



I hadn't thought of that switch, I think I've eliminated it though as
the last time I had this problem I was coasting with the clutch in and
the engine was idling very rough and stumbling still, just as it does
with more throttle applied, it doesn't seem to make a difference.
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Old 12-10-2005, 22:01   #6 (permalink)
Michael Pardee
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Re: 740T bucking when cold

"James Sweet" <jamessweet@hotmail.com> wrote in message
news:czNmf.11374$Wo2.2587@trnddc04...
>
>>
>> That is odd. How about the operation of the throttle position switch?
>> Maybe it's getting balky when cold and isn't coming out of idle mode.
>> Listening for the click with the engine off is a good start.
>>
>> But it always could be the AMM/connector.
>>
>> Mike

>
>
> I hadn't thought of that switch, I think I've eliminated it though as the
> last time I had this problem I was coasting with the clutch in and the
> engine was idling very rough and stumbling still, just as it does with
> more throttle applied, it doesn't seem to make a difference.


Ugh - I'm no expert on that but it does make me think of the AMM. The
connector on mine acted up, causing similar symptoms, and with it barely
idling I pressed on the connector a bit and the idle jumped up (like
starting) and then settled down. Cleaning the connector with alcohol
(because that was the best contact cleaner I had around) fixed it right up.

Mike


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Old 12-11-2005, 12:01   #7 (permalink)
James Sweet
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Posts: n/a
Re: 740T bucking when cold


>
> Ugh - I'm no expert on that but it does make me think of the AMM. The
> connector on mine acted up, causing similar symptoms, and with it barely
> idling I pressed on the connector a bit and the idle jumped up (like
> starting) and then settled down. Cleaning the connector with alcohol
> (because that was the best contact cleaner I had around) fixed it right up.
>



That had been my original suspicion, I'd just wanted to check if there
was anything else likely. I'll try cleaning the connector and see if
that helps, if it starts having the problem more regularly it'd be
easier to track it down. I do need to figure it out though, it's
dangerous, I'm afraid I'll forget and charge out into traffic and end up
broadsided when I lose power.
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Old 12-11-2005, 14:02   #8 (permalink)
..................................................
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Re: 740T bucking when cold

This is undoubtedly happening just as the engine computer systems are
going closed-loop. You undoutedly have one or two timed vacuum switches
screwed into the block and/or cylinder head. When the coolant is
warming up, these thermostatically timed vacuum switches open to allow
vacuum to various other components, one of them being the charcoal
canister, turbo overboost switch and in the case of my old '84 Turbo,
the distributor advance. It might be time to check ALL of your vacuum
lines and replace them. I just replaced all of my lines...took about
two weeks and made a HUGE difference. You should have seen the
condition of some of them, they were all sucking air. My old Volvo, from
the day I drove it from the dealer has had that idle decrease and a bit
of rough running during warm-up, particularly on very cold mornings just
before the engine goes closed-loop.




James Sweet wrote:
> After years of solid running, in the past few weeks my '87 740 Turbo has
> had a strange intermittent problem when cold. Either right after it's
> started or shortly after the engine will suddenly start idling very
> poorly, RPM dips down to 300-500 RPM and stumbles for several seconds,
> then it's fine. First time it happened I was pulling out into traffic
> and the car lost all power, started bucking heavily and sputtering, then
> suddenly roared to life with a spectacular burnout. The next time I was
> coasting down my hill when it started stumbling so I pushed in the
> clutch and coasted for a few moments until it recovered. Once it goes
> back to normal it runs great for the rest of the day, haven't had any
> other problems at all.
>
> What do you guys think? I'm leaning towards the beginnings of problems
> with the AMM, I'm afraid I might be chasing my tail trying to track this
> one down since it happens relatively rarely. It really feels like a fuel
> problem though.

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Old 12-11-2005, 14:02   #9 (permalink)
..................................................
Guest
 
Posts: n/a
Re: 740T bucking when cold

Have we determined whether or not the OP has a turbo or not? I know
that not all Volvo's with a "T" in the designation have been turbos in
the past. I don't think that any Volvo turbos had an MAF sensor.



Michael Pardee wrote:
> "James Sweet" <jamessweet@hotmail.com> wrote in message
> news:czNmf.11374$Wo2.2587@trnddc04...
>
>>>That is odd. How about the operation of the throttle position switch?
>>>Maybe it's getting balky when cold and isn't coming out of idle mode.
>>>Listening for the click with the engine off is a good start.
>>>
>>>But it always could be the AMM/connector.
>>>
>>>Mike

>>
>>
>>I hadn't thought of that switch, I think I've eliminated it though as the
>>last time I had this problem I was coasting with the clutch in and the
>>engine was idling very rough and stumbling still, just as it does with
>>more throttle applied, it doesn't seem to make a difference.

>
>
> Ugh - I'm no expert on that but it does make me think of the AMM. The
> connector on mine acted up, causing similar symptoms, and with it barely
> idling I pressed on the connector a bit and the idle jumped up (like
> starting) and then settled down. Cleaning the connector with alcohol
> (because that was the best contact cleaner I had around) fixed it right up.
>
> Mike
>
>

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Old 12-11-2005, 16:01   #10 (permalink)
Michael Pardee
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Posts: n/a
Re: 740T bucking when cold

"........................................................"
<jbincyberia@cox.nospam.net> wrote in message
news:%41nf.159$Zu5.14@fed1read03...
> Have we determined whether or not the OP has a turbo or not? I know that
> not all Volvo's with a "T" in the designation have been turbos in the
> past. I don't think that any Volvo turbos had an MAF sensor.
>

Mine does :-) / :-(

Mike


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