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" > 700/900 Series General

Notices

700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars

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

Idle issue

Views : 788

Replies : 15

Users Viewing This Thread :  

Reply
 
Thread Tools Display Modes
Old Jul 28th, 2021, 21:38   #1
m1santhrope
Junior Member
 

Last Online: Aug 21st, 2021 12:18
Join Date: Mar 2021
Location: Bury St Edmunds
Default Idle issue

Over recent months ive been gradually replacing serviceable items so I understand the car is at a minimum standard for reliability.

Ive changed rotor arm, distributor cover, plugs, leads, fuel filter, air filter, PCV, coolant, water pump etc. Yesterday i changed the battery, and its most likely a coincidence, but the engine tries to cut out when idling. It sits on 800 then dips suddenly only to regain its composure.

I noticed it seems to be more prone to this when it has warmed up. This is my only car so is causing me concern. Any help appreciated as usual.
m1santhrope is offline   Reply With Quote
The Following User Says Thank You to m1santhrope For This Useful Post:
Old Jul 28th, 2021, 22:04   #2
Laird Scooby
Premier Member
 
Laird Scooby's Avatar
 

Last Online: Today 16:15
Join Date: May 2012
Location: Lakenheath
Default

Quote:
Originally Posted by m1santhrope View Post
Over recent months ive been gradually replacing serviceable items so I understand the car is at a minimum standard for reliability.

Ive changed rotor arm, distributor cover, plugs, leads, fuel filter, air filter, PCV, coolant, water pump etc. Yesterday i changed the battery, and its most likely a coincidence, but the engine tries to cut out when idling. It sits on 800 then dips suddenly only to regain its composure.

I noticed it seems to be more prone to this when it has warmed up. This is my only car so is causing me concern. Any help appreciated as usual.
What car and engine is it? I have a few ideas but depending what you've got, could either be a quick fix or a "wait and see" fix.
__________________
Cheers
Dave

Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........
Laird Scooby is offline   Reply With Quote
The Following User Says Thank You to Laird Scooby For This Useful Post:
Old Jul 28th, 2021, 22:19   #3
m1santhrope
Junior Member
 

Last Online: Aug 21st, 2021 12:18
Join Date: Mar 2021
Location: Bury St Edmunds
Default

92 940 with a B200F NA. I also cleaned the MAF sensor and air intake valve if it makes any difference as I previously had idle issue when coming to a junction. Turned out intake valve was filthy and i also changed PCV.

This feels more like a misfire, the engine was shaking on its mounts on idle when I returned from work.

Last edited by m1santhrope; Jul 28th, 2021 at 22:33.
m1santhrope is offline   Reply With Quote
The Following User Says Thank You to m1santhrope For This Useful Post:
Old Jul 28th, 2021, 22:38   #4
Laird Scooby
Premier Member
 
Laird Scooby's Avatar
 

Last Online: Today 16:15
Join Date: May 2012
Location: Lakenheath
Default

Quote:
Originally Posted by m1santhrope View Post
92 940 with a B200F NA. I also cleaned the MAF sensor and air intake valve if it makes any difference as I previously had idle issue when coming to a junction. Turned out intake valve was filthy and i also changed PCV.

This feels more like a misfire, the engine was shaking on its mounts on idle when I returned from work.
When did you clean the PCV and throttle body?

Also pull fuse #1 to clear any random data caused by changing the battery.

What fuel (brand and grade) are you using?
__________________
Cheers
Dave

Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........
Laird Scooby is offline   Reply With Quote
Old Jul 28th, 2021, 22:45   #5
m1santhrope
Junior Member
 

Last Online: Aug 21st, 2021 12:18
Join Date: Mar 2021
Location: Bury St Edmunds
Default

Quote:
Originally Posted by Laird Scooby View Post
When did you clean the PCV and throttle body?

Also pull fuse #1 to clear any random data caused by changing the battery.

What fuel (brand and grade) are you using?
They were cleaned a fews months ago and cured the stalling. I use Tesco regular 95.
m1santhrope is offline   Reply With Quote
The Following User Says Thank You to m1santhrope For This Useful Post:
Old Jul 28th, 2021, 23:12   #6
Laird Scooby
Premier Member
 
Laird Scooby's Avatar
 

Last Online: Today 16:15
Join Date: May 2012
Location: Lakenheath
Default

Quote:
Originally Posted by m1santhrope View Post
They were cleaned a fews months ago and cured the stalling. I use Tesco regular 95.
Clean the PCV system again and then again after another month, it's surprising how much dirt moves when they're cleaned and how soon it makes its prescence felt!

Also i'd suggest changing to BP Ultimate (98RON) unleaded as well, you might not notice an immediate improvement but after a period of time you should.
__________________
Cheers
Dave

Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........
Laird Scooby is offline   Reply With Quote
The Following User Says Thank You to Laird Scooby For This Useful Post:
Old Jul 29th, 2021, 13:13   #7
Ian21401
Premier Member
 

Last Online: Feb 11th, 2023 21:32
Join Date: May 2010
Location: Blyth, Northumberland
Default MAF sensor or Lambda sensor?

I also have a 1992 940, B200F, NA which I bought in 2005.
Have you interrogated the OBD fault code reader?
During it’s first year with me it developed a similar fault. The OBD fault code reader, position 2 (fuel) indicated Fault code 1:2:1 (MAF sensor signal faulty). I didn’t know much about that engine at that time and was advised to change the Lambda sensor, which I did ( a genuine Bosch one) and the problem disappeared.
A couple of years later a similar problem arose eventually causing a complete “fail to run” on my way home from work necessitating a recovery to my home. The OBD again showed 1:2:1. I bit the bullet and ordered a new MAF sensor from my dealer. £250.00 after discount). This cured the problem.
__________________
Ian.

Since 2005: 1992 Volvo 940 estate 2.0L. Manual. Daily driver and workhorse.
Ian21401 is offline   Reply With Quote
The Following User Says Thank You to Ian21401 For This Useful Post:
Old Jul 29th, 2021, 14:13   #8
Laird Scooby
Premier Member
 
Laird Scooby's Avatar
 

Last Online: Today 16:15
Join Date: May 2012
Location: Lakenheath
Default

The one "problem" with that Ian is that if the fuel filter is blocked (as some symptoms are suggesting) it will also throw the MAF sensor fault which would be a red herring - and an expensive one!

Given the battery was changed it's highly possible there is rogue data floating about in the ECU memory, hence suggesting pulling fuse #1 to clear it. Also i forgot to ask - why was the battery changed?
__________________
Cheers
Dave

Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........
Laird Scooby is offline   Reply With Quote
The Following User Says Thank You to Laird Scooby For This Useful Post:
Old Jul 29th, 2021, 16:31   #9
Ian21401
Premier Member
 

Last Online: Feb 11th, 2023 21:32
Join Date: May 2010
Location: Blyth, Northumberland
Default

I understood that the fuel filter had been changed.
Llambda sensor shouldn’t cost too much. He’s already spent quite a bit on replacement parts.
If one could be found, substituting a known good MAF as an experiment may help, but sourcing one may be difficult.
__________________
Ian.

Since 2005: 1992 Volvo 940 estate 2.0L. Manual. Daily driver and workhorse.

Last edited by Ian21401; Jul 29th, 2021 at 16:33.
Ian21401 is offline   Reply With Quote
The Following 2 Users Say Thank You to Ian21401 For This Useful Post:
Old Jul 29th, 2021, 17:46   #10
Laird Scooby
Premier Member
 
Laird Scooby's Avatar
 

Last Online: Today 16:15
Join Date: May 2012
Location: Lakenheath
Default

Quote:
Originally Posted by Ian21401 View Post
I understood that the fuel filter had been changed.
Llambda sensor shouldn’t cost too much. He’s already spent quite a bit on replacement parts.
If one could be found, substituting a known good MAF as an experiment may help, but sourcing one may be difficult.
Sorry Ian, i should have been clearer, i was using that as an example, it could still be a fuel quality problem though, none of the cars i've owned have ever run ok on Tesco fuel and my red blocks were no exception.

However i'm wondering more as to why the battery was changed, what sort the new one is (if the old was calcium and so is the new one, that could be the problem) and whether the alternator is actually pumping out what it should.

If not then those symptoms are not unusual.
__________________
Cheers
Dave

Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........
Laird Scooby is offline   Reply With Quote
The Following 2 Users Say Thank You to Laird Scooby For This Useful Post:
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 18:54.


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