Volvo Community Forum. The Forums of the Volvo Owners Club

Forum Rules Volvo Owners Club About VOC Volvo Gallery Links Volvo History Volvo Press
Go Back   Volvo Owners Club Forum > "Technical Topics" > S40 / V40 '96-'04 General
Register Members CarsBlogs Help Calendar Mark Forums Read

Notices

S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004.

Information
  • VOC Members: There is no login facility using your VOC membership number or the details from page 3 of the club magazine. You need to register in the normal way
  • AOL Customers: Make sure you check the 'Remember me' check box otherwise the AOL system may log you out during the session. This is a known issue with AOL.
  • AOL, Yahoo and Plus.net users. Forum owners such as us are finding that AOL, Yahoo and Plus.net are blocking a lot of email generated from forums. This may mean your registration activation and other emails will not get to you, or they may appear in your spam mailbox

Thread Informations

RPM surge problem when AC is on.

Views : 2555

Replies : 30

Users Viewing This Thread :  

Reply
 
Thread Tools Display Modes
Old Apr 12th, 2006, 01:03   #21
peteS40
Guest
 
Tournaments Won: 2

Location:
Default

Hi vollic, anymore progress with your fault? I think you should try and find an air con specialist and see if they can find any explanation for your problem. It does sound like the aircon is having a problem, even without thinking about the revs problem.

Good luck,
Pete
  Reply With Quote
Old Apr 12th, 2006, 19:53   #22
vollic
Guest
 
Tournaments Won: 2

Location:
Default

Hi Pete S40,

the problems still persist after i replaced the sensors and the thermostat.
Oh Yes! I am looking for one.

Vollic
Quote:
Originally Posted by peteS40
Hi vollic, anymore progress with your fault? I think you should try and find an air con specialist and see if they can find any explanation for your problem. It does sound like the aircon is having a problem, even without thinking about the revs problem.

Good luck,
Pete
  Reply With Quote
Old Jun 15th, 2015, 08:01   #23
Jason989
Member
 

Last Online: Jul 26th, 2019 11:07
Join Date: May 2013
Location: Lincoln
Default

Dragging out an old thread here... Anyone know of a cure to this? With the air conditioning switched on, the engine revs itself to 3000 RPM once every 15-20 seconds roughly.

Butterfly valve, idle control valve both cleaned out regularly and done only about a week ago or so.

Are there any other components that could do with being cleaned?
__________________
Current:
2016 V40 T2 R Design Nav Geartronic
2003 S40 2.0 SE auto
2000 V40 1.8 XS
1988 240 GLT saloon
Jason989 is offline   Reply With Quote
Old Aug 23rd, 2019, 12:41   #24
oliverpervasive
Member
 

Last Online: Oct 14th, 2019 18:29
Join Date: Jul 2008
Location: london
Default air con - engine surge

I am now having this issue too.

Did you see the old post by mickey74 - seemed to think the ecu was stuck and could be reset by turing air flow up to max and turning engine on and off whilst turning air con on full or off.

Did you find another solution?
oliverpervasive is offline   Reply With Quote
Old Aug 24th, 2019, 12:54   #25
loelly
New Member
 

Last Online: Sep 23rd, 2019 13:19
Join Date: Sep 2018
Location: Heers
Default

Just a crazy thought,Is there a way that the fan when turning on could boost up the air intake. I know it is crazy but you never know.
loelly is offline   Reply With Quote
Old Aug 24th, 2019, 18:00   #26
CharlesStevenson
Premier Member
 
CharlesStevenson's Avatar
 

Last Online: Oct 16th, 2019 22:50
Join Date: Nov 2000
Location: Peterborough
Default

I can see this post was 1st started about 13 years old but it's still relevant to our cars today ... and yes, my car does this too.

Not sure exactly what causes it but as am having issues with the IAC and / or MAF then perhaps that's partly related to it.

I don't think it's related to anything else, hose, a/c system, water, battery, ign, etc, since the car runs well, except for the IAC / MAF issues.

It's been mentioned in other posts on here also.
__________________
Now: V40 2.0 T4 SE Y reg manual 145k
Then: Misc Volvo, Saab, BMW, MB, Ford, Vx, Opel, Fiat, Rover, Porsche, Alfa, Austin & others.
CharlesStevenson is offline   Reply With Quote
Old Aug 25th, 2019, 11:24   #27
oliverpervasive
Member
 

Last Online: Oct 14th, 2019 18:29
Join Date: Jul 2008
Location: london
Default AC - engine saurge S40 1.8 auto petrol

Yeah sorry to drag it back up but there was no clear resolution.

AC on then engine surge noticeable when driving slowly - actually effects speed and auto gear selection!

Turn AC off and problem gone.

How can ac clutch engagement effect throttle/rpm I don't understand.
It takes some current and as only a 1.8 I would almost expect the opposite.

Is the ecu trying to over compensate for this?
oliverpervasive is offline   Reply With Quote
The Following User Says Thank You to oliverpervasive For This Useful Post:
Old Sep 14th, 2019, 16:54   #28
drone
Member
 

Last Online: Yesterday 00:38
Join Date: Jan 2018
Location: Dover
Default

Take a look at https://www.volvoforums.org.uk/showthread.php?t=298577 for my take on this.
__________________
Do you ever walk into a room then wonder why you're there? Welcome to my world.
John.
drone is offline   Reply With Quote
The Following User Says Thank You to drone For This Useful Post:
Old Sep 21st, 2019, 19:41   #29
drone
Member
 

Last Online: Yesterday 00:38
Join Date: Jan 2018
Location: Dover
Default

It's been a week now since I cleaned the throttle and the problem hasn't returned.
__________________
Do you ever walk into a room then wonder why you're there? Welcome to my world.
John.
drone is offline   Reply With Quote
The Following 2 Users Say Thank You to drone For This Useful Post:
Old Sep 25th, 2019, 14:45   #30
oliverpervasive
Member
 

Last Online: Oct 14th, 2019 18:29
Join Date: Jul 2008
Location: london
Default AC rev problem solved - thanks Drone

Well I could not logically connect why the ac kicking in and causing an engine rev to be solved by cleaning the throttle. But I thought if it worked for Drone then worth a try. I only undid one jubilee clip and removed the hose from the throttle body. Few squirts of cleaning spray and a bit of gentle rubbing on what I could reach of the inside and the outer flap. Not sure what you lubed with silicon but I did not. Stuck back on and went for burn. Initially my aircon seemed to have stopped altogether - engine on and off - all good again with aircon...and no engine surges at low revs.
Its only done 28K and is an X reg 2000plate, but there was enough soot to leave a rag pretty dirty and in addition Im sure its responding quicker on acceleration.
So a big thanks to Drone and a problem solved - although Im still a bit bothered about the logic of it
oliverpervasive is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 10:47.


Powered by vBulletin
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.