11 Car starts fine but hessitates at cold. Runs fine when warm.
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This article is from the VW Technical FAQ, by with numerous contributions by Jan Vandenbrande others.
11 Car starts fine but hessitates at cold. Runs fine when warm.
[From: Bill N Gallas]
A: Rough running at cold can be caused by a bad coolant temp
sensor. On 8V engines the sensor is generally found on the
coolant flange bolted to the head and going to the radiator
upper hose. On 16 V Jettas it's next to the coolant outlet
at about the 7 o'clock position on the rear of the head (tranny
end) the sensor is a 2 wire unit and is about 17 MM socket size.
The sensor gets lazy and reading the resistance is a good check.
[Jan:] On Corrado G60s it is identified by a blue plug on the coolant
flange bolted to the head similar to the 8V cars.
Pulling the plug at idle usually will make the engine stall out.
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