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-2001 Passat B5 GLX V6 , 56000 miles
- New fuel filter, new Plat 4 Plugs, new air filter, throttle body cleaning, replaced engine speed sensor...
- NO CEL's

The problem I am having is that the car will not start up correctly when cold. I will turn it over and it will either studder for 5-10 seconds while turned over and then pick up, or it will just keep studdering until I release and try again....

Once warm, the car will start normally and performs decently, but with a noticable lag in power that pulsates up and down rapidly all the way through the RPMS.... not noticable to a passenger, but the go/hesitate is noticable easily to the driver trying to pull out...

I'd think that if I had a coolant sensor problem, it'd CEL on me.... and the dealer already took a shot at it, and couldn't diagnose it....(No Codes at all). I'm thinking about driving over to Hillside Imports (30 min drive) to have them take a shot at it.... But, I can't afford to spend another 300-400 dollars getting it looked at and worked on...

Has anybody else had a similiar problem? Or do one of you B5 Guru's have any suggestions?

Your help will be greatly appreciated!

Lisa Simpson
15,044 Posts
Cold start sensor. This tells the car is it cold and richens the mixture on cold start. You are probably having sporadic misfires (the go-stop feeling) that are due to flooding, etc. from the fueling issue.

Good luck. I have no idea how right I am, but it worked on my Rabbit. :)
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