Go Back  Volvo Forums - Volvo Enthusiasts Forum > Volvo Vehicles > Volvo 850
Reload this Page >

1996 Volvo 850 GLT Really Rough Idle and Starting Issues

Volvo 850 Made from 1993 to 1997, this Volvo line was available in both a wagon and a sedan, both with were graced with several trim levels.

1996 Volvo 850 GLT Really Rough Idle and Starting Issues

  #1  
Old 04-08-2019, 07:32 PM
Junior Member
Thread Starter
Join Date: Feb 2019
Location: USA
Posts: 3
Unhappy 1996 Volvo 850 GLT Really Rough Idle and Starting Issues

I have a 1996 Volvo 850 GLT, with well over 230,000 miles (odometer stopped working around 2014). My car had started idling rough and not wanting to start. It would have RPMs all over the place, and would lose most RPMs and wanted to stall. And when I would be driving if I let off the gas and then pressed the gas again, it would lose a lot of RPMs and then quickly kick back in again. Especially when it was at a complete stop at a red light or stop sign. Now it's not wanting to start, and when it does, it starts with low RPMs and takes a little bit for the engine to get up to regular idle RPMs (about 1000 RPMs). And doesn't really seem to suffer from wanting to stall when stopped, or when giving gas at a complete stop.

I have replaced the oil cap as it had quite a bit of play in it. And have as well found a hose that was missing its clamps, which I replaced. And that at first seemed to fix it, but it started doing things again. I have trouble codes P0172 and P0116. I do not know what could be the problem. My main guesses are mass air flow sensor and/or a vacuum leak, but I can't really find a vacuum leak, if there even is one.
 
  #2  
Old 04-08-2019, 11:02 PM
Senior Member
Join Date: May 2012
Location: Kingsport, TN
Posts: 1,515
Default

You can't necessarily see the vacuum leaks in your PCV system.
 
  #3  
Old 04-09-2019, 08:12 AM
Moderator
Join Date: Mar 2012
Location: Ridgefield, CT
Posts: 4,792
Default

The P0116 is telling you your engine coolant temp sensor is out of range - possibly a bad sensor, wiring or stuck thermostat. The sensor is located under the thermostat housing - just follow the upper radiator hose back to the block and look under the hose. You can test the sensor by undoing the connector then measuring resistance (google for temp charts to determine cold vs warm values)

To replace, remove the thermostat cover (two torx screws, leave the hose attached) to give access to the sensor. you can pull it out without draining the radiator - you'll lose about a cup or two of coolant). Replace the sensor, the thermostat and the overflow tank cap.

With that done, then you can clear the codes to see if your P0172 code returns. If yes, then I'd try cleaning the MAF and check for vacuum leaks, particularly around the tree...
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Mai
Volvo S40
2
10-31-2017 11:50 AM
xXNightRiderXx
Volvo S40
8
03-31-2017 03:01 AM
diman
Volvo 850
1
10-26-2007 07:31 PM
kathleen
Volvo S70
0
04-07-2007 08:36 PM


Thread Tools
Search this Thread
Quick Reply: 1996 Volvo 850 GLT Really Rough Idle and Starting Issues


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.