Volvo S70 Made from 1998 to 2000, this sporty model replaced the 850 sedan and instantly became a hit.

Intermittent Acceleration, MORE INFORMATION

  #1  
Old 10-24-2018, 04:36 PM
Junior Member
Thread Starter
Join Date: Jul 2018
Posts: 10
Angry Intermittent Acceleration, MORE INFORMATION

Alright so i posted about this before, but I have noticed more about the issue, so here is more information about the problem i face.

i'm having a really annoying problem with my 2000 S70 N/A B5244S. (automatic trans) this has been happening since i got it a year ago. After sitting all night, starting it and it drives fine. but after a few hours of continuous driving, if i turn it off and if it cools even slightly below operating temperature, it refuses to go up hills or under load.

So i've been leaving it running even when i'm away from it. and that worked, until its been getting colder outside and cooling the engine while it sits, also it seems the cooling fan has been staying on when its running and well below operating temperature.

the hesitation is not a misfire, and not a catalytic converter issue, i have catless side pipes. it's just simply a hesitation. it just stays at speed or even decreases when its screaming at 4k+ rpm, sometimes full power would kick back in for a second and then go back to hesitating. and i have a few examples here


ALSO. Last night it was consistently having this problem as it was cold. But i noticed, when i let off the throttle from the hesitation, a blue flame would come out every time.
I'm on my last nerve with this issue.
Any suggestions would be greatly appreciated.
 
  #2  
Old 10-25-2018, 08:26 PM
Moderator
Join Date: Mar 2012
Location: Ridgefield, CT
Posts: 4,782
Default

explain "blue flame would come out every time"?
 
  #3  
Old 10-26-2018, 08:37 AM
Psaboic's Avatar
Super Moderator
Join Date: Jan 2006
Location: SW, WA
Posts: 2,225
Default

Unplug the connector to the Mass Air Flow (MAF) sensor, by the air filter housing. It will throw a check engine light so you will need to get it cleared but drive it with the MAF disconnected for a bit and see if that helps. I'm leaning toward a dying MAF causing the issue.
 
  #4  
Old 10-26-2018, 02:05 PM
Junior Member
Thread Starter
Join Date: Jul 2018
Posts: 10
Default

Originally Posted by Psaboic View Post
Unplug the connector to the Mass Air Flow (MAF) sensor, by the air filter housing. It will throw a check engine light so you will need to get it cleared but drive it with the MAF disconnected for a bit and see if that helps. I'm leaning toward a dying MAF causing the issue.

I am testing that now, have an hour and a half drive to Clarksville I'll see if it starts acting up, if not... I'll be ecstatic! Then I'll get another MAF sensor. Updates coming soon.
 
  #5  
Old 10-26-2018, 08:19 PM
Junior Member
Thread Starter
Join Date: Jul 2018
Posts: 10
Default

Originally Posted by Psaboic View Post
Unplug the connector to the Mass Air Flow (MAF) sensor, by the air filter housing. It will throw a check engine light so you will need to get it cleared but drive it with the MAF disconnected for a bit and see if that helps. I'm leaning toward a dying MAF causing the issue.

Wow! So far it seems okay, the real test will be tomorrow when I am in Nashville doing deliveries all day. So far it seems like it has definitely helped. Got another MAF sensor at a junkyard and put that on. Updates will come tomorrow but thank you so much for the suggestion
 
  #6  
Old 10-26-2018, 10:31 PM
Junior Member
Thread Starter
Join Date: Jul 2018
Posts: 10
Default

Originally Posted by Psaboic View Post
Unplug the connector to the Mass Air Flow (MAF) sensor, by the air filter housing. It will throw a check engine light so you will need to get it cleared but drive it with the MAF disconnected for a bit and see if that helps. I'm leaning toward a dying MAF causing the issue.

Unfortunately it didn't help. I just didn't drive it like I usually do. Any other ideas?
 
  #7  
Old 10-27-2018, 10:22 AM
Psaboic's Avatar
Super Moderator
Join Date: Jan 2006
Location: SW, WA
Posts: 2,225
Default

Possibly a bad coil or wires causing a weak spark at higher RPM?? When is the last time the car had a complete tune up including fuel and air filters??
 
  #8  
Old 10-29-2018, 11:36 PM
Junior Member
Thread Starter
Join Date: Jul 2018
Posts: 10
Default

Originally Posted by Psaboic View Post
Possibly a bad coil or wires causing a weak spark at higher RPM?? When is the last time the car had a complete tune up including fuel and air filters??
I have replaced all coils, plugs, fuel pump, air filter, all air sensors except for idle air control
 
  #9  
Old 10-30-2018, 08:28 AM
Psaboic's Avatar
Super Moderator
Join Date: Jan 2006
Location: SW, WA
Posts: 2,225
Default

Is the check engine light on? If so can you get the codes so we can see what is up with the computer.
 
  #10  
Old 10-30-2018, 08:32 AM
Psaboic's Avatar
Super Moderator
Join Date: Jan 2006
Location: SW, WA
Posts: 2,225
Default

Just re-read the original post and I see the cooling fan has been staying on and the problem is getting worse now that it is turning colder. This sounds a LOT like a bad temperature control sensor. I know you said you replaced all the sensors, but this is the sensor located in the thermostat housing just below the thermostat. IF this sensor goes bad it can cause symptoms just like yours.
 
  #11  
Old 10-30-2018, 09:39 AM
Junior Member
Thread Starter
Join Date: Jul 2018
Posts: 10
Default

Originally Posted by Psaboic View Post
Just re-read the original post and I see the cooling fan has been staying on and the problem is getting worse now that it is turning colder. This sounds a LOT like a bad temperature control sensor. I know you said you replaced all the sensors, but this is the sensor located in the thermostat housing just below the thermostat. IF this sensor goes bad it can cause symptoms just like yours.
Oh! I was unaware there would be one under there. I'll see what I can do, also, my CEL Codes need to be cleared and redone because I've unplugged a lot of things and codes have appeared. Would that temperature sensor be a coolant or air temperature? Is it the one screwed in directly to the thermostat housing
 
  #12  
Old 10-30-2018, 10:40 PM
Junior Member
Thread Starter
Join Date: Jul 2018
Posts: 10
Default

Originally Posted by Psaboic View Post
Just re-read the original post and I see the cooling fan has been staying on and the problem is getting worse now that it is turning colder. This sounds a LOT like a bad temperature control sensor. I know you said you replaced all the sensors, but this is the sensor located in the thermostat housing just below the thermostat. IF this sensor goes bad it can cause symptoms just like yours.
Yep, still acts the same after I swapped the coolant sensor :/
Oh another problem has recently popped up as well, sometimes I'll be driving and the speedometer just goes to 0 and my odometer and trip counter just has lines where the numbers go. "-----------" and the lights like before you turn the car on come on like abs brake park brake etc then eventually it goess back to normal
 
  #13  
Old 10-31-2018, 08:54 AM
Psaboic's Avatar
Super Moderator
Join Date: Jan 2006
Location: SW, WA
Posts: 2,225
Default

Ok.....Well, my best advice right now would be to get the codes cleared and then see if any come back so we can get a clue as to what may be going on. The dash thing sounds like it may be a ground issue. We had an old 850 that would intermittantly do the same thing (it had over 300K on it) but my son sold it before I could dig into that issue. One other thing you could try is what I call a "hard reset". WIth the car off, remove the two computer modules and re-install them. They are located in the square black box in the front of the engine bay and are easily removed and reinstalled..
 
  #14  
Old 11-13-2018, 05:45 PM
Junior Member
Thread Starter
Join Date: Jul 2018
Posts: 10
Default

Originally Posted by Psaboic View Post
Ok.....Well, my best advice right now would be to get the codes cleared and then see if any come back so we can get a clue as to what may be going on. The dash thing sounds like it may be a ground issue. We had an old 850 that would intermittantly do the same thing (it had over 300K on it) but my son sold it before I could dig into that issue. One other thing you could try is what I call a "hard reset". WIth the car off, remove the two computer modules and re-install them. They are located in the square black box in the front of the engine bay and are easily removed and reinstalled..
I took out the engine and trans computers and it still ran the same, also found a new symptom about the odometer, speedomersp, brakes, abs and trip counter all turning off, when I turn on my headlights usually that makes it all come back on. Sometimes they stop again when they're on, so I turn the headlights off for a second or 2 and then back on and it usually 99% of the time gets it all working again, but it doesn't fix the stupid acceleration problems that I still can't figure out
 
  #15  
Old 11-14-2018, 08:47 AM
Psaboic's Avatar
Super Moderator
Join Date: Jan 2006
Location: SW, WA
Posts: 2,225
Default

Ok, the issue with the odometer, speedometer, etc.......sounds like either a bad ground under the dash panel, or possibly the ABS module. When we had a similar issue on an older 850, it was looking like the ABS module but I never got around to checking it out before my son sold the car, Do a foum seasrch and there are a lot of posts on the issue. As for the accelreation issue, since you have a 2000 model, it has an electronic throttle system. They have been known to cause similar issues of going into a limp mode when they get too hot or start to fail. Again, search for ETS issues on the forum as there are tons of posts. I hope this helps,
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Thang Vora
2001-2013 model year XC70
1
10-25-2017 09:43 PM
volvorecycle
Volvo XC70
1
07-22-2015 07:44 PM
gordon368
Volvo S80
2
06-06-2009 03:01 AM
Colinruss
Volvo S60 & V60
3
12-14-2007 11:55 AM


Thread Tools
Search this Thread
Quick Reply: Intermittent Acceleration, MORE INFORMATION


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.