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Old 07-20-2005, 16:02   #1 (permalink)
A
Guest
 
Posts: n/a
Volvo 740 erratic idle

Hi Everyone:

The Machine:
1990 Volvo 740 GLT 16v 2.3l
4 speed + overdrive (ie stick shift)
Estate
193k miles, well looked after, used more-or-less daily on a variety of
short (10 min) and long (1 hour+) runs.


The Symptoms:
- On a cold start it is quite erratic when idling - will go between
~500rpm and ~900rpm.
- Initial accelleration from cold start is not smooth, but after a
minute or so accelleration is normal and smooth, although idling is
still erratic as above.
- Having been driven for about five minutes idle is less erratic, though
still wobbles between ~800rpm and ~900rpm.

Someone pointed out that it could be an air leak somewhere. Do you think
that this is feasible, and would it manifest itself anywhere else (eg at
the air filter?)

Many thanks for any replies received,

Andrew
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Old 07-20-2005, 20:02   #2 (permalink)
James Sweet
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Posts: n/a
Re: Volvo 740 erratic idle


"A" <andrew_on_tour@NOSPAM.operamail.com> wrote in message
news:dbm8og$9un$1$8300dec7@news.demon.co.uk...
> Hi Everyone:
>
> The Machine:
> 1990 Volvo 740 GLT 16v 2.3l
> 4 speed + overdrive (ie stick shift)
> Estate
> 193k miles, well looked after, used more-or-less daily on a variety of
> short (10 min) and long (1 hour+) runs.
>
>
> The Symptoms:
> - On a cold start it is quite erratic when idling - will go between
> ~500rpm and ~900rpm.
> - Initial accelleration from cold start is not smooth, but after a
> minute or so accelleration is normal and smooth, although idling is
> still erratic as above.
> - Having been driven for about five minutes idle is less erratic, though
> still wobbles between ~800rpm and ~900rpm.
>
> Someone pointed out that it could be an air leak somewhere. Do you think
> that this is feasible, and would it manifest itself anywhere else (eg at
> the air filter?)
>
> Many thanks for any replies received,
>
> Andrew


Yeah it sounds like classic symptoms of a vacuum leak, look for any cracked
or disconnected hoses, and carefully inspect the accordian hose between the
AMM and the throttle body.


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Old 07-20-2005, 21:02   #3 (permalink)
James Taylor
Guest
 
Posts: n/a
Re: Volvo 740 erratic idle

On Wed, 20 Jul 2005 20:30:32 +0100, A
<andrew_on_tour@NOSPAM.operamail.com> wrote:

>Hi Everyone:
>
>The Machine:
>1990 Volvo 740 GLT 16v 2.3l
>4 speed + overdrive (ie stick shift)
>Estate
>193k miles, well looked after, used more-or-less daily on a variety of
>short (10 min) and long (1 hour+) runs.
>
>
>The Symptoms:
>- On a cold start it is quite erratic when idling - will go between
>~500rpm and ~900rpm.
>- Initial accelleration from cold start is not smooth, but after a
>minute or so accelleration is normal and smooth, although idling is
>still erratic as above.
>- Having been driven for about five minutes idle is less erratic, though
>still wobbles between ~800rpm and ~900rpm.
>
>Someone pointed out that it could be an air leak somewhere. Do you think
>that this is feasible, and would it manifest itself anywhere else (eg at
>the air filter?)
>
>Many thanks for any replies received,
>
>Andrew




Check your distributer cap. Oil can get inside from the shaft seal
and cause poor performance.
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Old 07-20-2005, 21:02   #4 (permalink)
Michael Pardee
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Posts: n/a
Re: Volvo 740 erratic idle

"A" <andrew_on_tour@NOSPAM.operamail.com> wrote in message
news:dbm8og$9un$1$8300dec7@news.demon.co.uk...
> Hi Everyone:
>
> The Machine:
> 1990 Volvo 740 GLT 16v 2.3l
> 4 speed + overdrive (ie stick shift)
> Estate
> 193k miles, well looked after, used more-or-less daily on a variety of
> short (10 min) and long (1 hour+) runs.
>
>
> The Symptoms:
> - On a cold start it is quite erratic when idling - will go between
> ~500rpm and ~900rpm.
> - Initial accelleration from cold start is not smooth, but after a minute
> or so accelleration is normal and smooth, although idling is still erratic
> as above.
> - Having been driven for about five minutes idle is less erratic, though
> still wobbles between ~800rpm and ~900rpm.
>
> Someone pointed out that it could be an air leak somewhere. Do you think
> that this is feasible, and would it manifest itself anywhere else (eg at
> the air filter?)
>
> Many thanks for any replies received,
>
> Andrew


A typical cause of cold idle problems is a dirty throttle body. When
cleaning it, pay particular attention to the passage at the bottom that goes
to the idle adjust knurled screw. Be sure to start with a nearly full can of
carb cleaner, because it takes most of a can to clean all the goo out.

Mike


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Old 07-22-2005, 05:01   #5 (permalink)
A
Guest
 
Posts: n/a
Re: Volvo 740 erratic idle

A wrote:
> The Symptoms:
> - On a cold start it is quite erratic when idling - will go between
> ~500rpm and ~900rpm.
> - Initial accelleration from cold start is not smooth, but after a
> minute or so accelleration is normal and smooth, although idling is
> still erratic as above.
> - Having been driven for about five minutes idle is less erratic, though
> still wobbles between ~800rpm and ~900rpm.
>
> Someone pointed out that it could be an air leak somewhere. Do you think
> that this is feasible, and would it manifest itself anywhere else (eg at
> the air filter?)


Without actually having done anything, the car now refuses to start when
hot, yet starts first time from cold...any further thoughts anyone?

Cheers,

A
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Old 07-22-2005, 05:01   #6 (permalink)
A
Guest
 
Posts: n/a
Re: Volvo 740 erratic idle

A wrote:
> The Symptoms:
> - On a cold start it is quite erratic when idling - will go between
> ~500rpm and ~900rpm.
> - Initial accelleration from cold start is not smooth, but after a
> minute or so accelleration is normal and smooth, although idling is
> still erratic as above.
> - Having been driven for about five minutes idle is less erratic, though
> still wobbles between ~800rpm and ~900rpm.
>
> Someone pointed out that it could be an air leak somewhere. Do you think
> that this is feasible, and would it manifest itself anywhere else (eg at
> the air filter?)


Without actually having done anything, the car now refuses to start when
hot, yet starts first time from cold...any further thoughts anyone?

Cheers,

A
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Old 07-22-2005, 05:01   #7 (permalink)
A
Guest
 
Posts: n/a
Re: Volvo 740 erratic idle

A wrote:
> The Symptoms:
> - On a cold start it is quite erratic when idling - will go between
> ~500rpm and ~900rpm.
> - Initial accelleration from cold start is not smooth, but after a
> minute or so accelleration is normal and smooth, although idling is
> still erratic as above.
> - Having been driven for about five minutes idle is less erratic, though
> still wobbles between ~800rpm and ~900rpm.
>
> Someone pointed out that it could be an air leak somewhere. Do you think
> that this is feasible, and would it manifest itself anywhere else (eg at
> the air filter?)


Without actually having done anything, the car now refuses to start when
hot, yet starts first time from cold...any further thoughts anyone?

Cheers,

A
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Old 07-22-2005, 17:01   #8 (permalink)
Peter K L Milnes
Guest
 
Posts: n/a
Re: Volvo 740 erratic idle

First try just one press of the send key. Next look on the Brickboard Forum
FAQs.

All the best, Peter.

700/900/90 Register Keeper,
Volvo Owners Club (UK).

"A" <andrew_on_tour@NOSPAM.operamail.com> wrote in message
news:42E0BBB3.3050502@NOSPAM.operamail.com...
>A wrote:
>> The Symptoms:
>> - On a cold start it is quite erratic when idling - will go between
>> ~500rpm and ~900rpm.
>> - Initial accelleration from cold start is not smooth, but after a minute
>> or so accelleration is normal and smooth, although idling is still
>> erratic as above.
>> - Having been driven for about five minutes idle is less erratic, though
>> still wobbles between ~800rpm and ~900rpm.
>>
>> Someone pointed out that it could be an air leak somewhere. Do you think
>> that this is feasible, and would it manifest itself anywhere else (eg at
>> the air filter?)

>
> Without actually having done anything, the car now refuses to start when
> hot, yet starts first time from cold...any further thoughts anyone?
>
> Cheers,
>
> A



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Old 07-22-2005, 20:01   #9 (permalink)
James Sweet
Guest
 
Posts: n/a
Re: Volvo 740 erratic idle


> Without actually having done anything, the car now refuses to start when
> hot, yet starts first time from cold...any further thoughts anyone?
>



Check the coolant temperature sensor, not the one for the guage but for the
injection, as well as the wiring to it.


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Old 07-23-2005, 02:01   #10 (permalink)
A
Guest
 
Posts: n/a
Re: Volvo 740 erratic idle

Peter K L Milnes wrote:
> First try just one press of the send key. Next look on the Brickboard Forum
> FAQs.


Sorry, I reconfigured my SMTP server and it threw a bit of a wobbly...
Thanks for the tip about the Forum.

A
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