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Old 01-13-2011, 09:04 PM
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Default rough idling and engine temperature gauge not working

Hey,
First, the temperature gauge stays completely cold most of the time, however it does move occasionally after start up, but stops working (goes back to fully cold) after a little while.

Also, while idling, the engine revs at 1200, then drops suddenly to 800 rpm, and repeats over and over until the car starts moving. This problem doesn't usually occur until after the car has been running for a little while.

I think the two might be connected, and its probably a problem with the engine temperature sensor.

Anyone else have a similar problem or any ideas?

I'm running a 1999 Golf 2.0L 5speed
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Old 01-13-2011, 11:00 PM
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well to fix ur engine temp gauge problem... u need to flush ur radiator out or just replace the thermostat. over time gunk will cover the gauge and there for it will read sometimes and then other times go all the way down. Mine did that but i didnt have a rough idle... but at least i can help u a little bit prolly change plugs and wires. ur car will always love that. down side is if the golf is like mine to get to the radiator u have to pull off the bumper and hopefully u know how to do that
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Old 01-13-2011, 11:30 PM
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thanks, I plan on replacing the sensor, I guess I mine as well do the plugs while Im at it. I read somewhere you could just wait until the car is cool and not have to drain the fluid. any thoughts?
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Old 01-14-2011, 01:16 PM
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well idk about that... but ur best bet is to take off the bumper and find the sensor. cause then u will have the car all jacked up in the front
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Old 01-14-2011, 03:58 PM
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Thanks, I replaced the sensor, had to go toa dealer to get the part. I didn't have to take off the bumper though, it was a pretty easy fix once I had the part, didn't even have to drain the fluid.

Didn't fix the rough idling though
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Old 01-15-2011, 12:44 PM
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nice how much was that? I still need to do mine lol could u take a pic and show me where the sensor is so i dont have to take the bumper off. i have a vr6 so its prolly different but i would like to give it a try
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Old 01-15-2011, 09:48 PM
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Coolant temp sensor and gauge VW Jetta, Golf ,GTI

pretty good directions
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Old 01-16-2011, 02:44 AM
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thanks that wont work on my engine though thats for a 2.0 i will try following the coolent hose and see if i can find it thanks again!
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