2002 Volkswagen Jetta Cold starts in cold weather

Avatar
BANDREWS
  • MEMBER
  • 1 POST
Engine Performance problem
2002 Volkswagen Jetta 4 cyl Front Wheel Drive Manual 127K miles

I have an '02 Jetta 1.8T AWP, manual, 127K mi, that has just started its second winter in Denver. Until then, it was in Florida and never experienced cold. This winter, I'm having a problem I didn't have the first winter. Cold starts in cold weather require a minute or two to warm up before the car runs right. It has super-low power, barely enough to move the car, almost dying, then suddenly catching and leaping forward before almost dying again. Appears to me to be running too lean for the cold. Once it warms up, it runs perfectly. I would have thought it was maybe the O2 sensor, but it's not giving a CEL. Any tips on where to look would be most appreciated. Thanks!
Dec 3, 2009 at 12:34 AM
Avatar
RACEFAN966
  • ✓Experienced Mechanic
  • 5,029 POSTS
Check the coolant temp sensor. If you would ohm it and do this when the car is cold (before you start it) get back to me with the ohms reading and the air temp at the time of the temp and I will see it is in range.
Dec 4, 2009 at 2:31 AM
Avatar
RELATIVE4
  • MEMBER
  • 5 POSTS
15 deg F: 7.59 kO
70 deg F: 1.59 kO
ca. 200 deg F: ca. 150 O
operating (190 deg F?): 188 O
Dec 7, 2009 at 9:50 AM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Frequently Asked Problems for This Vehicle