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Old 11-19-2012, 02:30 AM
Flametamer123Registered Member Flametamer123 is offline
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Join Date: Oct 2010
Albemarle, NC, USA
Car: 2002 Beetle 1.9 TDi
Default Sluggish or no start in 2002 Beetle TDI

I have read these forums now for about 3 hrs with no luck. Ok I have a 2002 Beetle TDI 1.9. Yesterday I couldn't get it started it was 42 degrees F outside. Jump started and started fine. Today I had to go rescue the wife because it wouldn't start. Whe I got there I had read that disconnecting the engine coolant sensor would trick it into starting, and that worked, when I got her home I removed the old sensor and put in a new one, still having the problem. I metered the glow plugs same voltage as the battery, and with the coolant sensor disconnected I have voltage on all 4 connectors for the wires supplying the plugs, but nothing when the sensor is hooked up. Battery is really weak, and after charging when I bypass the sensor, the plugs will kill the battery, could all this be caused by a weak battery, will the plugs not turn on with a weak battery? Email responses to

Last edited by Flametamer123; 11-19-2012 at 02:39 AM..
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Old 11-19-2012, 03:14 AM
Smileybug's Avatar Member Sponsor Smileybug is offline
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Join Date: Sep 2005
Cary, NC, USA
Car: 2003 20th GTI, 1984 Jetta GL TD, 1982 Rabbit pickup (In Progress)

I bet it is a bad battery. Diesels take a lot of juice to get started, especially once it gets colder out.

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The Past Ride: Darla, 102k, '99 New Beetle GL 5-speed. Bone stock. Acquired 4/6/05. Gave her life for me 8/17/11. RIP
The Project: Klaus,'84 Jetta GL Turbo Diesel. Rebuilt and bringing 50+ mpg.
The Baby Brother: Günther, Stage 2 Unitronic, 20th Anniversary Edition GTI
The new project: Mr. T, 1982 Rabbit Pickup (Caddy), work in progress
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Old 11-19-2012, 11:55 PM
Flametamer123Registered Member Flametamer123 is offline
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Join Date: Oct 2010
Albemarle, NC, USA
Car: 2002 Beetle 1.9 TDi
Default I'm Thinking Good Thoughts LOL

I put the new battery in today, started fine all day, we will see in the morning when cooler. Thanks for your help, keep your fingers crossed.
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