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" > S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General

Notices

S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models

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

2.5T high idle and erratic power

Views : 604

Replies : 5

Users Viewing This Thread :  

Reply
 
Thread Tools Display Modes
Old Jul 28th, 2019, 20:22   #1
marcb
Master Member
 

Last Online: Feb 20th, 2024 14:53
Join Date: Jul 2006
Location: London
Default 2.5T high idle and erratic power

Not used car for a week and battery was flat so recharged it and on starting instead of the usual initial high idle and drop to about 7-800 rpm it stays at about 1300-1400 and driving it is rather weird as it seems to be surging a bit. Putting the aircon on high brings it more into normal.

Any ideas what might be wrong before I take it for code read etc.?

it's a 2005 2.5T with about 105,000 miles on the clock. Engine has always been faultless.
marcb is offline   Reply With Quote
Old Jul 28th, 2019, 21:41   #2
Georgeandkira
Premier Member
 

Last Online: Yesterday 14:40
Join Date: Feb 2009
Location: Hackensack
Default

How old is this battery which died due to a week off?

Knowing the battery is in good shape and fully charged and knowing the ETM and MAF are clean is where I'd start.
Georgeandkira is offline   Reply With Quote
Old Jul 29th, 2019, 16:31   #3
ajm
Master Member
 

Last Online: Yesterday 00:39
Join Date: Dec 2002
Location: Inverness
Default

Obviously there are many things it could be, but on past experience I'm guessing MAF. That would normally trigger a warning light, but you could always test by unplugging the MAF and seeing if there's any significant difference in behaviour.
ajm is offline   Reply With Quote
Old Aug 16th, 2019, 21:34   #4
marcb
Master Member
 

Last Online: Feb 20th, 2024 14:53
Join Date: Jul 2006
Location: London
Default

I've had codes read (thanks Alex) and the key one is obviously the idle speed control - signal too high.

Now what happened next - Alex cleared the codes and then I tried to restart the car but the battery had gone flat, so we started it from his Volvo. Lo and behold on driving home the idle was normal and has stayed so.

So either it was some magic with Vida, the flat battery, or a combination that has so far fixed it...

Nothing usually simple with these cars.





Last edited by marcb; Aug 16th, 2019 at 22:18.
marcb is offline   Reply With Quote
Old Aug 16th, 2019, 23:42   #5
DSK
C70 T5
 
DSK's Avatar
 

Last Online: Mar 23rd, 2022 22:00
Join Date: Sep 2006
Location: Midlands
Default

Weak batteries can play havoc with electrical systems.

Personaly, if a battery goes on me, its swapped out and replaced with a Bosch S5 immediately.
__________________

2000 C70 T5 GT Coupe
1998 S70R / 1995 Toyota Supra Twin Turbo
2007 Mercedes CLS 320 CDI / 2011 Mercedes S350 Bluetec
2007 Suzuki GSXR-1000
DSK is offline   Reply With Quote
Old Aug 17th, 2019, 00:37   #6
marcb
Master Member
 

Last Online: Feb 20th, 2024 14:53
Join Date: Jul 2006
Location: London
Default

Battery is only about 15 months old and is a Volvo OEM one and was fine until recently. I think there's a parasitic drain but I haven't found it yet. It's not the alarm siren battery gone bad as I've removed the fuse.
marcb 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 14:18.


Powered by vBulletin
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.