A4 99 Avant- Starts OK when it is cold. Once warmed, then shut off, it becomes very hard to start. The starter turns the engine fine, but it will not fire. You have to play with the gas pedal abit and after about a min of starter cranking it will eventually catch. Once it finally starts, the idle starts to waver back and forth between 2000 and 2200 rpm. After a mile or so of driving everything is normal, idle at 950.

Can someone help out here?

 

Check for fault codes. If none, replace your engine coolant temp. sensor.

 

dont know what the problem is but dont ever run your starter for more than a few seconds!!!!!!! you said a minute of cranking and thats way too much. That is exactly how starters get burnt up. sorry to harp and preach but ive heard some bad stories that started out like yours. and they dont end with just a couple dollars being wasted. the most that should be done is ten seconds of cranking and thirty seconds of cooling down at a minimum!

 

I say check your fuel pressure regulator.

 

It's your Coolant Temp Sensor. I will put $10 on it. It's a cheap part even from the dealer ($10-$15).

Josh

 

can anyone on this forum advise the correct resistance to ground and the pin to pin values of ect sensor?
thanks

 

i got my ECTS at VW for 33$.. i called audi to see how much they wanted... it was 50$!

just go down to vw and say you have a passat wagon, if they ask for the vin cause its a 99. say its the old body style

 

its variable resistance depending on the temperature which makes it hard to measure. just go to ecstuning.com and buy a new one for like $8.

 

Hey did you ever fix this? I have same problem and p0118 code -coolant temp sensor voltage high- sounds like this is likely possibility. Did you try this fix, and did it work?

 

Third on the coolant temp sensor. Just make sure that you get the correct color, they come in blue and green.