Question about 1994 Volvo 940

1 Answer

Fails emissions test. Still gets 25 mpg. runs good otherwise.

Posted by on

  • vic7978 Jul 11, 2010

    I thought about o2 sensor too. One problem, this model does not have one. Also, no leaded gas has been run through it. Cheap gas probably, but not leaded. Been checking further, seems this model 940 uses an EGR system that can clog up do to soot build-up. EGR may need replacing.
    But thanks for your input.
    Vic

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 4,044 Answers

You will most likely have to replace the complete exhaust system. Assuming it is failing the Lead portion of the test procedure which means leaded fuel has been run in the vehicle. Your other option is possibly having to replace the O2 Sensor but that usually triggers the Check Engine light although not always.

Posted on Jul 11, 2010

  • James Young Jul 11, 2010

    Almost every vehicle built since the 70's that I know of uses an EGR except maybe a VW Bug. I'm not saying it's not the EGR valve but I would look at replacing the Exhaust system or at least to Catalytic converter. Good Luck.

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that 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.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

2 Answers

Can 1999 ford contour run properly without catalytic converters


Yes it will run but the emissions will be high........will not pass any vehicle emissions test, depending where you are using the vehicle could be illegal!

Feb 15, 2015 | Ford Cars & Trucks

2 Answers

Why would my car not pass Georgia Emissions testing?


Can you remember how many miles you have driven since the engine was installed? What I mean is that if you have a good running engine and have a new converter, sometimes the easiest things are the ones overlooked. Check your air filter to make sure it isn't dirty and restricting air flow. Also check your spark plugs to see what kind of shape they are in and if they are burning clean. Spark plugs can tell a lot. If you had transfered any emission related parts from the old engine to the new, maybe one of those items has an issue or is clogged. I hope this helps. Good luck.

Jul 01, 2014 | 1992 Pontiac Sunbird

1 Answer

Virginia emissions test failed - 15 MPH HC and CO; 25 MPH HC


get your injectors cleaned. change the air filter .change your plugs. put a fuel cleaner in your fuel tank.

Dec 01, 2013 | 1998 Volvo S70

1 Answer

2006 F150 5.4, 4x4, Lariat. Intermittent excessive humming/fan noise from engine compartment


Sounds like the fan clutch bearing is locked up. Running in direct drive will affect MPG drastically. Its a 2006 so its time to replace it. See if the fan blade will spin by hand with the engine off or if excessive wobble is present at the bearing.

Jun 02, 2017 | 2006 Ford F-150 SuperCrew

2 Answers

My 1997 Honda Civic failed it's Emissions Test. See below the ASM Emission Test Results. What do you suggest I do to get the car to pass the smog test? ASM Emission Test Results: 15mph - RPM = 1587...


Jose, I don't know if this will give you the answer you are looking for because there are many things to consider here. The exhaust gas recirculation valve (EGR) is one of the main things involved in reducing NO emissions. This valve is controled by the power control module. (PCM) This is your vehicles computer. The PCM monitors the vehicles speed and will command the EGR to open when the vehicle attains a certain speed, which is why the ASM test being done is recorded at two different speeds. At 25 MPH your vehicle failed the hydrocarbon (HC) emissions limit and this could be for a number of reasons. When is the last time you car was tuned up? Old spark plugs, wires, clogged air filters, oxygen sensors, leaking injectors (personal experience) or the PCV valve could be contributing to the results of the test. I guess that the easiest way to go is to tune up the engine replacing the spark plugs, wires, air filter and the PCV valve and don't forget to have the oil changed at the same time. Only then should have the vehicle retested and see what the results are. Should it fail again you may have to consider having the EGR or the catalytic converter replaced depending on what portion of the test fails. If the NO fails I would consider the EGR. If the HC fails then I would consider the catalytic converter. Good luck with this.

Apr 05, 2011 | 1997 Honda Civic

1 Answer

Honda Civic vtech 1.6 (2003) poor fuel consumption


the more air the less your tire touch the ground and as a result your going to get better gas milage.

Mar 16, 2010 | 2003 Honda Civic

1 Answer

At 34psi I was getting 25 to 30 mpg. Since changed psi to 30 am getting 17 to 20 mpg. Had a full service and cambelt change, new brake discs & pads when I bought it. Has had new fan motor for cool air...


if you are talking about your tire pressures then yes you will get less MPG with a lower pressure as more tread will be touching the road and that equates to more resistance, however the less tread touching the road means your braking won't be as good, having a higher tire pressure will also wear out your tires quicker, you will also use more petrol if you have your AC turned on,

Mar 16, 2010 | 2003 Honda Civic

1 Answer

1993 honda civic ex will not pass HC emissions test. Please help


You don't say what state you are in and what the requirements. The early 90s Honda Civics frequently are high on emissions under certain circumstances depending on how the test is run. If you are in a state that allows you to get a waiver with a certain amount of repair - that would be the recommended way to go. A lot of times the amount required is enough to detect the problem, but if not it is basically the cost of keeping the car. I am in Washington State and my 91 Honda Civic runs great and gets 38 mpg but fails the test. I have a new O2 sensor, catalytic converter and distributor and fail. I pay $150 for repairs / waiver every 2 years - and I am an ASE Certified Master Tech. I figure $75 a year saves me a car payment.

Dec 16, 2009 | 1994 Honda Civic

1 Answer

Failed emissions....high nox


Sticking egr will raise everything except nox. Bad o2 bad cat hard to give an accurate diagnosis with out checking it

Oct 12, 2009 | 1994 Lexus LS 400

Not finding what you are looking for?
1994 Volvo 940 Logo

Related Topics:

58 people viewed this question

Ask a Question

Usually answered in minutes!

Top Volvo Experts

yadayada
yadayada

Level 3 Expert

75197 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7782 Answers

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

Answer questions

Manuals & User Guides

Loading...