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

V70 idling and surging problems.

Views : 1002

Replies : 8

Users Viewing This Thread :  

Reply
 
Thread Tools Display Modes
Old Jan 19th, 2022, 00:20   #1
Bruceleemad
New Member
 

Last Online: Feb 24th, 2022 00:00
Join Date: Aug 2021
Location: Newport
Default V70 idling and surging problems.

So, can anyone help ? 2001 Volvo V70 T5. Fault codes as in image, but main one is 644a. This can up last year and I bought a new camshaft reset valve and fitted it. It does not seem to have fixed my rough idle or the surging at low revs. Also had pcv system replaced, new oil trap etc, and that doesn't seem to have helped. Can't find any obvious vacuum leaks, but getting smoke test next week. A few fault codes are about the etm and I wonder if a faulty etm can throw up other codes ? The etm is a marelli yellow label. Anyone got any clues as to what I can do, without taking it to the local stealership ? Thank you.
Attached Images
File Type: jpg FB_IMG_1642532626799.jpg (282.0 KB, 5 views)
File Type: jpg FB_IMG_1642532618767.jpg (182.4 KB, 6 views)
Bruceleemad is offline   Reply With Quote
Old Jan 19th, 2022, 01:00   #2
Carlosos
Member
 

Last Online: Today 14:22
Join Date: Dec 2021
Location: Newark
Default

Quote:
Originally Posted by Bruceleemad View Post
So, can anyone help ? 2001 Volvo V70 T5. Fault codes as in image, but main one is 644a. This can up last year and I bought a new camshaft reset valve and fitted it. It does not seem to have fixed my rough idle or the surging at low revs. Also had pcv system replaced, new oil trap etc, and that doesn't seem to have helped. Can't find any obvious vacuum leaks, but getting smoke test next week. A few fault codes are about the etm and I wonder if a faulty etm can throw up other codes ? The etm is a marelli yellow label. Anyone got any clues as to what I can do, without taking it to the local stealership ? Thank you.
Take the etm off and clean off all the gunk around the butterfly. After that I’m not sure.
Carlosos is offline   Reply With Quote
Old Jan 19th, 2022, 10:03   #3
stuart bowes
trying to be helpful
 

Last Online: Today 14:37
Join Date: Aug 2020
Location: Dagenham
Default

Get specific step by step advice on the TB cleaning before starting because from what I've heard there are a number of pitfalls and it's an expensive item
__________________
V70 '01 auto petrol 2.4 (140) 70k

-------------------------
mini project - link
stuart bowes is online now   Reply With Quote
Old Jan 19th, 2022, 11:11   #4
VOLVOBOY
Lazy Member
 

Last Online: Today 13:06
Join Date: Mar 2007
Location: HORLEY
Default

Hi.
Throttle Pedal Position Sensor is U/S..
Throttle body , Throttle pedal and Engine Control Module are interlinked.
The Control Module doesn`t know where the pedal position is so is constantly adjusting.
VOLVOBOY is offline   Reply With Quote
Old Jan 19th, 2022, 11:27   #5
VOLVOBOY
Lazy Member
 

Last Online: Today 13:06
Join Date: Mar 2007
Location: HORLEY
Default

Hi. You need to check the engine timing.
The camshaft belt may have been changed but the the timing wasn`t done properly. If it `s not done right the timing marks may appear correct but the camshaft can be out of position . You need to check at the opposite end of the engine where the camshaft lock tool is fitted.
Clean the Throttle body as the other post suggests. If all else doesn`t fix it then look at changing the unit.
You say you`ve changed the "re-set unit" . Do you mean the VVT Valve ? If so,
is the gasket leaking ?
VOLVOBOY is offline   Reply With Quote
Old Jan 19th, 2022, 14:23   #6
ASt85
Premier Member
 

Last Online: Yesterday 17:49
Join Date: Aug 2010
Location: Walderslade....Kent
Default

Quote:
Originally Posted by Bruceleemad View Post
So, can anyone help ? 2001 Volvo V70 T5. Fault codes as in image, but main one is 644a. This can up last year and I bought a new camshaft reset valve and fitted it. It does not seem to have fixed my rough idle or the surging at low revs. Also had pcv system replaced, new oil trap etc, and that doesn't seem to have helped. Can't find any obvious vacuum leaks, but getting smoke test next week. A few fault codes are about the etm and I wonder if a faulty etm can throw up other codes ? The etm is a marelli yellow label. Anyone got any clues as to what I can do, without taking it to the local stealership ? Thank you.
Amongst the more important checks would be to
a) check that the silicon vacuum/air lines are attached to the filter box and that all "rubber" connectors on those silicone pipes are intact
b) change the air filter
c) change the plugs
d) change the fuel filter
e) carry out a plug coil pack check, ie switch no1 coil pack to number 2 (replace 1 with 2) - note any change, then swap no3 to no4 (replace 3 with 4) then swap no5 to no1 (replace 1 with 5)
note any change, then swap no5 to no 1 (replace no5 with no1)
f) clean the air flow meter/sensor with AFM cleaner eg Liqui Moly 4066 Air Flow Sensor Cleaner- DO NOT USE ALCOHOL
__________________
The saddest moment is when the one who gave you the best memories....becomes a MEMORY

V70 SE 2004 2.3L T5 Geartronic, C70 2005 2.0T Automatic, Sold 2.4l 20 Valve Automatic Torslander Sold 854 GLT 20v Auto
ASt85 is offline   Reply With Quote
Old Jan 23rd, 2022, 13:43   #7
Caleb
Junior Member
 

Last Online: Jul 3rd, 2022 01:24
Join Date: May 2017
Location: New Orleans
Default

Quote:
Originally Posted by ASt85 View Post
f) clean the air flow meter/sensor with AFM cleaner eg Liqui Moly 4066 Air Flow Sensor Cleaner- DO NOT USE ALCOHOL
Similar problem here. I did clean my MAF sensor with alcohol. Did not soak it just brightened it up with a Q tip dipped in isopropyl. Did I trespass?
With car running if I disconnect MAF the car immediately dies which makes me think it's working. I had never seen this warning in fact I read on forums that alcohol was ok.

cheers, Caleb 2001 XC70 2.4
New Orleans
__________________
Caleb White
Cameraman/New Orleans
2001 V70XC 156K current
1971 142E (retired into a tree 1978)
1978 245D (sold 180k)
Caleb is offline   Reply With Quote
Old Jan 23rd, 2022, 18:43   #8
ASt85
Premier Member
 

Last Online: Yesterday 17:49
Join Date: Aug 2010
Location: Walderslade....Kent
Wink

Quote:
Originally Posted by Caleb View Post
Similar problem here. I did clean my MAF sensor with alcohol. Did not soak it just brightened it up with a Q tip dipped in isopropyl. Did I trespass?
With car running if I disconnect MAF the car immediately dies which makes me think it's working. I had never seen this warning in fact I read on forums that alcohol was ok.

cheers, Caleb 2001 XC70 2.4
New Orleans
There are various warnings about using methyl or indeed ethyl alcohol; I've no idea what MAF the primary component of MAF cleaner is - all I do know is when I used methanol it didn't make any difference but using a dedicated MAF cleaner afterwards did the trick!
__________________
The saddest moment is when the one who gave you the best memories....becomes a MEMORY

V70 SE 2004 2.3L T5 Geartronic, C70 2005 2.0T Automatic, Sold 2.4l 20 Valve Automatic Torslander Sold 854 GLT 20v Auto
ASt85 is offline   Reply With Quote
Old Jan 23rd, 2022, 19:00   #9
Caleb
Junior Member
 

Last Online: Jul 3rd, 2022 01:24
Join Date: May 2017
Location: New Orleans
Default

That's good info on the dedicated MAF cleaner. My experience so far is when I unplugged MAF initially the car ran the same as when it was connected. So I cleaned with alcohol and repeated test and the care stalled when removed.

So apparently alcohol has done the trick for me. Altho this does not mean it is functioning correctly, only that its doing SOMETHING now!

Does anyone know if the car "should" immediately die when MAF is unplugged ?

If so I think I'll leave it alone, cheers
__________________
Caleb White
Cameraman/New Orleans
2001 V70XC 156K current
1971 142E (retired into a tree 1978)
1978 245D (sold 180k)
Caleb 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 15:26.


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