1989 Volvo 740 Turbo Troubles

Thread Tools
 
Search this Thread
 
Old Oct 15, 2013 | 01:31 PM
  #1  
SilverSurfer's Avatar
Thread Starter
|
Junior Member
Joined: Oct 2013
Posts: 6
Likes: 0
From: West Coast
Default 1989 Volvo 740 Turbo Troubles

Having just sorted out, we think, issues with the turbo now the engine idles for about 20 seconds before the motor dies. There's no disruption to the interior lights just the motor dies. Anyone have similar problem? It's our only vehicle so we really need to get it running again.
 
Reply
Old Oct 15, 2013 | 07:10 PM
  #2  
pierce's Avatar
no mo volvo
Joined: Oct 2010
Posts: 11,289
Likes: 109
From: 37 North on the left coast
Default

does the tachometer drop to zero just before or after the motor dies?

does it start right up after this?

what is this about 'issues with the turbo' ?
 
Reply
Old Oct 17, 2013 | 06:27 PM
  #3  
SilverSurfer's Avatar
Thread Starter
|
Junior Member
Joined: Oct 2013
Posts: 6
Likes: 0
From: West Coast
Default

[QUOTE=pierce;368675]does the tachometer drop to zero just before or after the motor dies?

does it start right up after this?

Yes and yes. My husband says the motor will run as long as he keeps the revs up but as soon as he lets it idle it cuts out.

"what is this about 'issues with the turbo' ?"

We seemed to have some plumbing issues which you helped us identify and we thought sorted out. It's since my husband did that work that this motor trouble has started. We love this car but it seems pretty finicky.
 
Reply
Old Oct 17, 2013 | 06:35 PM
  #4  
pierce's Avatar
no mo volvo
Joined: Oct 2010
Posts: 11,289
Likes: 109
From: 37 North on the left coast
Default

well, it *is* a 25 year old car. if this new thing started after fixing the air plumbing, my guess is some wiring got disturbed. I'd check the idle switch on the throttle body, the idle air controller under the intake manifold, the hall sensor on the distributor, the MAF/AMM connector...

I assume when you say it stalls after 20 seconds, thats after a cold start? or is it also 20 seconds after a hot restart ?
 
Reply
Old Oct 18, 2013 | 09:02 PM
  #5  
SilverSurfer's Avatar
Thread Starter
|
Junior Member
Joined: Oct 2013
Posts: 6
Likes: 0
From: West Coast
Default

"the MAF/AMM connector..." What is this?

"I assume when you say it stalls after 20 seconds, thats after a cold start? or is it also 20 seconds after a hot restart ?"

Yes both.

Thank you so much for all your advice. My husband is going back under the hood in the morning. She's a vintage for sure
 
Reply
Old Oct 18, 2013 | 10:03 PM
  #6  
pierce's Avatar
no mo volvo
Joined: Oct 2010
Posts: 11,289
Likes: 109
From: 37 North on the left coast
Default

the MAF aka AMM is the Mass Air Flow meter aka Airflow Mass Meter. this is the device on the air pipe between the air filter box and the turbo, it has a good size electrical connector on the side. it measures how much air is going through it, which tells the fuel injection computer (known as the ECU) how much fuel to squirt into the engine.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
jvinc43
Volvo 240, 740 & 940
4
Aug 23, 2014 12:36 PM
steelheaddan
Volvo 240, 740 & 940
10
Feb 5, 2011 06:54 PM
alpine
Volvo 240, 740 & 940
1
Aug 12, 2010 04:04 PM
Scraperondubz
Volvo 240, 740 & 940
1
Apr 13, 2009 11:44 PM
Paul1
Volvo 260, 760 & 960
3
Sep 10, 2005 01:57 PM




All times are GMT -5. The time now is 06:16 AM.