Question about 1991 Volvo 940

1 Answer

Runs rough then clears up &runs great

Some time when driving the engine will start to surge & run rough & black smoke comes out the exhust i notice that the turbo gauge will bounce up and down if i feather the fuel peddle it seams to clear its self and runs ok it only happend 2 times in the last 3 weeks other than that it runs great

Posted by on

  • Marvin
    Marvin May 11, 2010

    I suspect the Mass Air Flow sensor is the problem, but before you replace anything run a test to get any trouble codes from the computer, Krafen and other parts stores do it for free, then get back to me on this post.

×

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Found waste gate on turbo sticking freed up ok now

Posted on Sep 22, 2008

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE:

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Hello, I have a 2000 toyota tacoma 2.7 4 cylinders, which has been running very rough on first start up, like 3 cylinders and then clears up on its own after about 30sec.....


Hi. If you see white smoke out the tailpipe, the engine is running rough and the coolant temp is getting higher and fluctuating. Your engine has a bad head gasket. There is no way the radiator cap can hold back that type of pressure. With the radiator cool and full. As the engine runs, you should witness coolant filling the over flow reservoir. Any questions please write back.

Oct 07, 2018 | Toyota Tacoma Cars & Trucks

2 Answers

Occasionally runs rough


This is usually caused by a bad crankshaft postion sensor.

Oct 02, 2008 | 1991 Mazda 626

1 Answer

What advise can you give for multiple 2006 GMC envoy Denali engine problems?


What is the fault code you receive when the engine light comes on?
If you do not know try to retreive the engine trouble codes and post them here.

Jul 19, 2014 | 2006 GMC Envoy Denali

1 Answer

So I drive a 1999 chevy Cavalier and ive been having many problems with it. It blows black smoke sometimes from the exhust, on the hot and cold gauage the needle works its way to the hot end all the time,...


Hi,
It sounds like you have alot of problems which may only be a couple.
Have the coolant thermistor checked, it sounds like this is not switching off and causing the engine to over fuel, making it run rough and blow black smoke out the exhaust.
Have the engine thermostat checked it maybe faulty causing the engine to over heat., have these done and see how you cars goes then.

Oct 14, 2011 | 1999 Chevrolet Cavalier

1 Answer

Black smoke from exhaust, rough idle, black soot on plugs


signs of a bad fuel pressure regulator-- the vehicle will run rough, the engine will not start ( usually in the mornings,) many times engine starts but stalls shortly after starting. a bad regulator can result in fouled plugs. replacement is only cure. 1- black soot on plugs-2-black smoke from tailpipe-3- running rough-4- stalling, good-day! repost if need be.

Aug 10, 2011 | 1994 Suzuki Sidekick

1 Answer

I have just had to have the aa out to my car.I was driving along and i noticed black smoke coming out of the exhaust and lack of power,any ideas to what my be the problem?


coolant tempurature sensor may be bad. (if it is bad it will run to rich, run rough at idle, and produce black smoke. engine may stall out.

Feb 19, 2010 | 2004 Renault Sportwagon

1 Answer

Now starting when cold, it belches black smoke and runs very roug


Sounds like either the float level is too high, there is a problem with the float needle valve or the power valve is stuck. I'd take the carb off and either replace it or take it apart and check everything inside. If you do nothing, chances are it will either get worse or if it's a small piece of junk inside, it may clear up by itself...I'd take it apart. Since it's pretty new, if you are careful, likely you won't need a gasket kit.

Nov 30, 2009 | 1983 Jeep CJ7

1 Answer

Black smoke when i start engine, very rough idle.


sounds like possible a sensor went bad or is loosly connected. O2 sensor??? Also check the air filter. Sounds like whatever it is, is making the truck run rich----that would be the black smoke.


Hope this helps

Aug 08, 2009 | 1999 Ford Super Duty F 450

Not finding what you are looking for?
1991 Volvo 940 Logo

Related Topics:

311 people viewed this question

Ask a Question

Usually answered in minutes!

Top Volvo Experts

Marvin
Marvin

Level 3 Expert

85178 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22484 Answers

Jonah Oneal

Level 3 Expert

14092 Answers

Are you a Volvo Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...