Poor Idle

Volvofogey · Oct 7th, 2008, 20:05

1999 S40 2.0T auto.

The old S40 is suffering with its idling. I seems to me to idle to low, sometimes causing it to cut out. When i start it up from either cold or hot i have to 'blip' the throttle otherwise it takes ages to start or doesnt at all.
When cold it idles in gear at 900ish rpm, once warm it idles at between 400 - 600 rpm as indicated by the rev counter. When it idles at 400 rpm there is a vibration which i think is from the engine reving to slow. Once running the car preforms well.

I have searched the forum and i seem not to be alone. I have just had the car fully serviced and was told that he couldnt see anything immidiatly wrong ( he did say he doesnt have Volvo software for his diagnostic machine).

I see some people have cleaned the idle solinoid and the throttle body, how is this done??? did it work??
In the absence of a Haynes manual is it the bit behind the air filter, and where is the idle solinoid?

Thanks
Simon

wa666ou · Oct 7th, 2008, 22:28

not quite the symptoms, but have you thought about checking the fuel pressure regulator?

Volvofogey · Oct 8th, 2008, 19:37

That was changed for a new one about 8 weeks ago.

Any one else?

stevo48 · Oct 8th, 2008, 20:17

Do a search for throttle body cleaning, there are lots of posts regarding this procedure.

wa666ou · Oct 8th, 2008, 23:17

for some strange reasons I have idling issue every now and then (few days in every couple of months) and then it goes away.

if it's mechanical... the problem would stay I believe.

When I had some terrible erratic idling while back, then I cleaned MAF, TB and IAC. After that problems were gone.

Volvofogey · Oct 10th, 2008, 12:39

Thanks for the help.

I have cleaned the throttle body with carb clean and have removed the Idle Control Valve, took the top off and cleaned that too. I also replaced the gasket and used the squeezy gasket sealant.

And............

The car has never felt as good. The RPM at idle is around 700-800rpm. No more stalling and vibrations.

Take about a feel good feeling and all for £6

thanks
again
Volvofogey
(see the s40 in the near side lane doing 40mph, well thats me.)

Oct 7th, 2008, 20:05	#1
Volvofogey S40 2.0t auto Last Online: Oct 29th, 2015 10:53 Join Date: Mar 2008 Location: nottingham	Poor Idle 1999 S40 2.0T auto. The old S40 is suffering with its idling. I seems to me to idle to low, sometimes causing it to cut out. When i start it up from either cold or hot i have to 'blip' the throttle otherwise it takes ages to start or doesnt at all. When cold it idles in gear at 900ish rpm, once warm it idles at between 400 - 600 rpm as indicated by the rev counter. When it idles at 400 rpm there is a vibration which i think is from the engine reving to slow. Once running the car preforms well. I have searched the forum and i seem not to be alone. I have just had the car fully serviced and was told that he couldnt see anything immidiatly wrong ( he did say he doesnt have Volvo software for his diagnostic machine). I see some people have cleaned the idle solinoid and the throttle body, how is this done??? did it work?? In the absence of a Haynes manual is it the bit behind the air filter, and where is the idle solinoid? Thanks Simon

Oct 7th, 2008, 22:28	#2
wa666ou Junior Member Last Online: Jan 26th, 2016 08:34 Join Date: Jun 2006 Location: Kermarne	not quite the symptoms, but have you thought about checking the fuel pressure regulator?

Oct 8th, 2008, 19:37	#3
Volvofogey S40 2.0t auto Last Online: Oct 29th, 2015 10:53 Join Date: Mar 2008 Location: nottingham	That was changed for a new one about 8 weeks ago. Any one else?

Oct 8th, 2008, 20:17	#4
stevo48 Premier Member Last Online: Jul 9th, 2020 20:08 Join Date: Dec 2007 Location: Halifax West yorkshire	Do a search for throttle body cleaning, there are lots of posts regarding this procedure.

Oct 8th, 2008, 23:17	#5
wa666ou Junior Member Last Online: Jan 26th, 2016 08:34 Join Date: Jun 2006 Location: Kermarne	for some strange reasons I have idling issue every now and then (few days in every couple of months) and then it goes away. if it's mechanical... the problem would stay I believe. When I had some terrible erratic idling while back, then I cleaned MAF, TB and IAC. After that problems were gone.

Oct 10th, 2008, 12:39	#6
Volvofogey S40 2.0t auto Last Online: Oct 29th, 2015 10:53 Join Date: Mar 2008 Location: nottingham	Thanks for the help. I have cleaned the throttle body with carb clean and have removed the Idle Control Valve, took the top off and cleaned that too. I also replaced the gasket and used the squeezy gasket sealant. And............ The car has never felt as good. The RPM at idle is around 700-800rpm. No more stalling and vibrations. Take about a feel good feeling and all for £6 thanks again Volvofogey (see the s40 in the near side lane doing 40mph, well thats me.)

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