Question about 1997 Volkswagen Jetta

1 Answer

I went for an emissions test today and it failed the mechanic said the car might be running too hot or too lean also notice the the heat gauge stays at cold when driving.HELP

Posted by on

  • David Melrose May 11, 2010

    what did you fail for? High Nox or somthing else?

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Volkswagen Master
  • 4,369 Answers

I suspect you need a new thermostat. It should be running at 195 degrees F.

If the engine does not fully warm up, the engine can not go into emission control mode.

The engine temperature sensor sends a signal to the engine/emissions computer that the engine is now at normal operating temp. The computer then starts controlling fuel flow, EGR, etc. so that emissions are being controlled.

When the enigne is cold, you are in what we call "open loop" meaning no emission control.

Get the thermostat installed first. Make sure it's the same temp rating as the one that's in there. Either 180 degrees or 195 degrees.

Then you should pass.

Posted on Mar 03, 2009

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:

1 Answer

I have a 89 buick electra 98000 miles I failed emissions for high co at idle I put a obd1 tester on it it showed vehicle was not going into closed loop I replaced oxygen sensor it then went into closed...


to stay in close loop o2 sensor have to be hot
and the converter catalyst is the one who keep the heat......
converter is it factory or never been change.
with scanner obd1 you should see the voltage variation of o2 sensor. it should go from lean to rich . .500mv is the middle then under .500mv is lean and over it is rich.......with this information ecm correct the fuel delivery
hope it helps

Sep 29, 2013 | 1989 Buick Electra

1 Answer

Hard time starting when warm/hot.


This can be due to the Lean condition of the fuel ratio. The heat sensors need to cool down to put the engine into a "cold start routine". If the heat sensors are not cooling, then it will be hard to start.

Poor grade of fuel. Each grade of fuel has an ignition point. With the engine in Lean mode, the flash ratio prevents easy starting. You could also have a bleed down of fuel or a malfunction in the Evaporative emission system. This is now requiring your car to repressurize the system due to a bad solenoid or a faulty emissions line.

I hope my solution is helpful..

Jun 08, 2012 | Honda Cars & Trucks

1 Answer

Oil gauge on 91 Dodge Dakota suddenly running very high but plenty of oil


have a mechanic test the oil pressure with a mechanical gauge
it is more than likely that the electric sender unit has failed and is sticking internally
the tic noise could be a relay working from an intermittent power supply or bad ground

Mar 27, 2017 | 1991 Dodge Dakota

1 Answer

2004 Jeep Grand Cherokee temp gauge high when heat is on


If your "check engine" light is turn on, I suggest scanned the PCM to know exactly what fault code is stored there. Additionally, could be some problem with the "temp sending unit".

Keep us updated.

Jan 23, 2012 | 2004 Jeep Grand Cherokee

1 Answer

Hyundai sonata 2000 gls. v6. HAs no EGR. Emission test, first try, HC(0) CO (0) nox 1033 mechanic said my engine seems hot (there was also heat out of vents blowing out. I cleaned my maf sensor and...


Borrow or change the MAF completely,you have a LEAN combustion condition.The MAF could very well be the problem as it is the most common source lean combustion.
You will need a catalytic converter in good shape.

Apr 08, 2017 | 2000 Hyundai Sonata

2 Answers

Engine running to lean


I had the same problem...Just went into mechanics today, EGR system was shot.

May 05, 2009 | 1995 Eagle Talon

1 Answer

1996 Cutlass Supreme-Temp shows hot even after engine rebuilt


is the temp gauge sender new
or the engine cooling fans spinning fast enough
air in the heating pipes ? bleeding

Feb 28, 2017 | 1996 Oldsmobile Cutlass Supreme Coupe

1 Answer

Price to fix Emissions


BEFORE YOU CAN ESTIMATE THE COST YOU WILL HAVE TO FIND OUT WHY THE TRUCK IS RUNNING LEAN, IT COULD BE FUEL PRESSURE, AN INTAKE MANIFOLD VACUUM LEAK AND SO ON, THEY WILL MOST LIKELY THEY WILL QUOTE YOU 2 HOURS LABOR TO START AND DIAGNOSTICS, OR ABOUT $200

Dec 01, 2008 | 2001 Ford Explorer Sport Trac

Not finding what you are looking for?
1997 Volkswagen Jetta Logo

Related Topics:

301 people viewed this question

Ask a Question

Usually answered in minutes!

Top Volkswagen Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22059 Answers

yadayada
yadayada

Level 3 Expert

71162 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6992 Answers

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

Answer questions

Manuals & User Guides

Loading...