Question about 1991 Volkswagen Jetta

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Engine will not run when it gets warmed up unless you unplug the coolant temp sensor. 1.8 gas engine

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Replace the coolant temp sensor its giving a false reading causing it to quit .

Posted on Nov 12, 2010

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Nissan Pathfinder will not start when engine is luke warm. Please read through the details as the Fixya character counter sucks/


Please don't hurt more walls! Just kidding..what a problem. If you have the correct sensor installed and it is working correctly (check with multimeter for change in resistance when cold, warm, hot) then the signal getting to the computer must be getting scrambled in some way. Check the wire connection where you clip it onto the sensor. Use a multi meter and check for continuity there and back further along the wire.
if you can't trace the wire all the way to the computer, you may have to do a bodge job..rig a wire into the cab with an on off switch.
Only to be used when the engine is warm..flick switch to off, start truck, flick switch back to reengage sensor.......
think of it as an unusual theft deterrent !

Mar 27, 2015 | 1999 Nissan Pathfinder

1 Answer

1996 vw 2.0 aba starts runs great for about 15min then goes into a rough idle and dies almost like its not getting enough gas ?


Does the car have any check engine codes? Usually if the car runs poorly when warmed up, its because the computer tries to put the car into "closed loop mode" when it's up to operating temp but something is wrong. When engine is cold, the ECU uses the coolant temp sensor to adjust fuel mixture, when warm, it switches to O2 sensor and monitors other systems like EGR, etc. In my experience I've seen this be anything from O2 sensor, coolant temp sensor, or EGR valve. Could be a dirty throttle body too, as this is a common issue on the ABA engine.

Apr 08, 2014 | 1996 Volkswagen Jetta

1 Answer

Temp guage does not move


There are 2 sensors 1 is temp sensor for dash gauge and 1 is engine coolant sensor for computer. Does the upper radiator hose get hot and pressurized. The engine coolant sensor has two wires one has a reference voltage 5 volts and the other is signal return to computer with key on is will have a minimal voltage .25 volts this tells you that the wire is not broken between sensor and computer. the sensor is a negative coefficient sensor average sensor range about 390 ohms warms and 2400 ohms cold engine.

Mar 23, 2014 | 2003 Kia Rio

2 Answers

Stalls out when gas is let off


You don't say what size engine you have, so diagnostic analysis is a bit difficult. Please supply engine size and answer these questions.

1. After it stalls, do you sometimes smell fuel?
2. Does it restart easily after a stall, or do you have to hold the gas pedal to the floor to restart it?
3. Can you keep it running by working the gas pedal?
4. Has you fuel consumption increased since this began?

I ask these questions because on most engines there is a coolant temperature sensor that the ECM used to control the amount of fuel to the injectors based upon the engine coolant temperature. When the engine is cold it supplied more fuel than when warm. If the sensor malfunctions it tells the ECM that the coolant is -40F
and that causes massive fuel to be supplied. This may not affect a cold start once the engine needs the fuel, but it will flood and stall out the motor when warm. If you can keep the engine running by pressing the gas pedal, you are allowing the motor to rev up and use the extra fuel, but you will find you gas mileage reduces by as much as half.

Nov 06, 2013 | 2003 GMC Yukon XL

1 Answer

Car will start and run till it starts to warm up and then it will run rough and die. I can restart it but it will run for a minute and then die again like its not getting gas. I have changed sending...


unplug coolant tempurature sensor. if it runs better, then the sensor is your problem. a bad coolant sensor adjusts air to fuel mixture, depending on temp. of engine. it will run to rich and not enough of air if bad. it will also run rough at idle. if check engine light is on get it scanned for the problem code.

Aug 10, 2011 | Chevrolet Cavalier Cars & Trucks

2 Answers

Won't start when cold


hello wyatt...... Is your jag.built with a carburetor or fuel injected?
Carb, your choke is not set to close when cold, and should be set. When set, it also sets a cam that keeps the engine running fast. Then when warm, you hit the pedal and the cam moves, and the engine speed goes to normal. Unless the choke is set, the engine cannot keep running, as it tries to run on cold gas and it can't run good on cold gas. It needs more gas, therefore, and the choke makes more gas go into the engine.

Fuel Injected, the computer should adjust the amount of gas your car is getting when cold. If not, the coolant sensor might be bad.
The coolant sensor senses the cold engine and tells the computer to add more gas. Once the engine is warm, the coolant sensor tells the computer to put the gas to normal.
So, if the sensor is not working, the engine will try to run normal, and if cold, it can't. Joe Thanks for choosing Fixya!

Dec 24, 2010 | 1985 Jaguar XJ6

1 Answer

'99 Buick Regal coolant will cone on.


How warm does it get? The computer won't turn them on unless the coolant temp gets to 235

Apr 06, 2010 | 1998 Buick Regal

2 Answers

Engine run good until warmed up


One runs the gauge (or light), and one is for the computer. You want the one for the computer. You can unplug to see if it's for the guage when warmed up.

Sep 21, 2009 | 1992 Chevrolet Lumina

1 Answer

When I first start my Jeep each day, I have to let it warm up or it hestitates. It's like it's not getting getting gas. Occasionally, it even stalls. That problem only lasts for the first few minutes that...


It is running lean during cold start mode when the fuel is vaporizing fast enough to keep the engine running.

Either your cold start system is not operating, or your Mass Air Flow Sensor is coated with varnish and needs to be cleaned with carb cleaner. Your engine coolant temp sensor tells your engine computer what the temo of the engine is. The computer then tells the fuel injectors how much fuel to inject. When engine is cold, it injects more fuel to keep the engine running. So, it may be the coolant temp sensor. Autozone can run a computer scan for free and tell you what the fault codes are. However, if the coolant sensor fails to always reading warm engine, the scan may not get a fault code for that.
A coolant sensor should be about $75, cheaper on ebay. Report back on codes and progress.

Jun 03, 2009 | 2005 Jeep Wrangler

1 Answer

Temp guage dont read


U are talking about two different sending units, one is the Engine Coolant Temp sensor, the other is the temp guage sender, sounds like you have a bad thermostat, if the engine doesn't reach the proper operating temp it will set a code for the engine coolant temp sensor, and the guage will not move or move very little, replace your thermostat and both problems will go away.

Mar 02, 2009 | 1996 Pontiac Grand Am

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