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    Thread: hard to start when hot 1.8t 2001

    1. 02-14-2009 05:20 PM #1
      after driving till engine warms up to 190 degrees shuts off when idling but not when driving. also if i turn engine off while its warm it wont start till its totally cooled off. so i have to wait about an hour till it cools.

    2. 02-14-2009 05:22 PM #2
      Coolant temp sensor, battery, or alternator.
      I had a similar issue, would be hard to start when warm...turned out to be a bad battery.
      Quote Originally Posted by antsrcool View Post
      So my 2001 Wolfsburg caught fire last night
      2001 Wolfsburg w/K03s Drive fast and weave alot. NUKE THE WHALES!
      K&N drop-in | NS Boost-o-meter & pod | Homemade adjustable MAP clamp | MBC@19 psi | SMIC vent mod | Energy Suspension 70A inserts | R32/TT LCA Bushings

    3. 02-14-2009 05:35 PM #3
      how much would a coolant temp sensor cost

    4. 02-14-2009 06:08 PM #4
      I had the same problem long time ago.. I have feeling its your engine speed sensor.. Here's why, when the engine speed sensor wears out, as the engine runs it heats up, resistance in the sensor goes up, to the point the engine ecu thinks it's an open circuit and shuts off the engine. then you can't restart it.
      after it cools down, the resistance comes back down to normal, the engine ecu sees it and lets the engine start. then it heats up and dies again. round and round you go..."
      01' BT Jetta
      14' Audi Q5 TDi
      14' JSW TDi

    5. 02-14-2009 06:13 PM #5
      the speed sensor being the dwell sender on end of cam?

    6. 02-14-2009 06:29 PM #6
      Quote, originally posted by chippievw »
      the speed sensor being the dwell sender on end of cam?
      Are you talking about the cam position sensor, thats sits at the intake cam side.. Engine speed sensor sits on the bottom in the block just below the oil fiter housing...
      01' BT Jetta
      14' Audi Q5 TDi
      14' JSW TDi

    7. 02-14-2009 06:35 PM #7
      oh right that one, we call them the impulse sensor in Ireland, my bad..

    8. 02-15-2009 11:04 AM #8
      thanks alot i have a very strong feeling that ur right.

    9. 10-09-2010 09:34 PM #9
      just got done fixing this similar problem.
      when the car was cold, it started up great, ran great, idled great.
      but when the car was sitting hot after a drive, about 1 hr, it was hard to start.
      eventually it would start after periodical cranking for about 5-15mins.
      the engine never threw a code tho. i pulled every sensor i could think of to clean it,
      still didnt fix the problem.
      decided to take readings of the intake air temp sensor, considering the problem only occured when
      the engine was hot. (i also looked at the coolant temp sensor, which was ok.)
      turns out, it was indeed a bad IAT sensor, it wasnt bad enough to throw a cel, but it was off enough to throw the ecm fuel/ignition off the map.
      here are my resistance readings from old/new sensor for ref:
      old sensor new sensor
      at cold: 1500 1900
      at hot after parking: 550 1000
      at hot 1 hr after: 750 350

      as u can see it was way off,
      since the new sensor, no probs whatsoever

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