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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old February 17th, 2011, 17:48   #1
Bdpprocessors
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Default Tdi slow start hot and cold.

Im having slow starts about 10 seconds cold and 5 or 6 hot on my 99.5 tdi jetta. It started after i changed my fuel filter ( i cranked the motor quite a bit til it started about 10 mins. Letting the starter rest every 10 seconds for 30 seconds).


Ive done some testing. And the car starts up with the coolant tem sensor unplugged. So i replaced it with the one from napa and this did nothing.


I also unplugged the glow plug harness and coolant temp sensor and it fired right up. Which leads me to believe theres a fuel pressure problem at start up when the sensor is plugged in .


Is there a way to test this in vcds.
Is it possible that my starter is not spinning fast enough
Is there a way to raise start up pressure or ammt in vcds?

Thanks for any help
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Old February 19th, 2011, 09:01   #2
Danno!
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I replaced my starter because it was the only thing left that prevented my car from starting cold weather. Not only does the car crank over in bitter cold now, but it surprisingly fixed the hot starting problem that has plagued the car since the day I bought it.

It all has to do with cranking speed.
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Old February 19th, 2011, 09:15   #3
Bdpprocessors
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Thanks! I guess thqtll b next. But what gets me is it starts perfect withou the coolan temp sensor plugged in
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Old February 19th, 2011, 10:28   #4
turbocharged798
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There's glitch in the ECU that does not allow fueling if the engine spins less than ~250RPM. When it's cold(ie unplugging the temp sensor), the engine uses a cold start map and it brings it out of a glitch area.

If you do a search there is a HUGE thread on this very topic.
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04 Jetta TDI . MFA cluster, e-codes, reverse light mod, LED trunk light. 180K.
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Old February 19th, 2011, 10:48   #5
Bdpprocessors
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That makes sense. So ill need a new starter. Is there a way to fix this in vcds or do you need a tune to fix it?
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Old February 19th, 2011, 12:49   #6
Dana Hanchett
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Check your fuel injection timing. If it's not in the upper range it will not start quickly. Hope this helps.
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Old February 19th, 2011, 12:58   #7
Bdpprocessors
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What block ?
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Old February 19th, 2011, 13:05   #8
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Group 000, hit go, switch to basic setting, hit tdi timing. Select ALH from the drop down menu.
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Old February 19th, 2011, 13:23   #9
Bdpprocessors
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It bounces from dead On to slightly retarded. But the car started fine brior to replacing the fuel filter and cranking it alot toget it started
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Old February 19th, 2011, 17:19   #10
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Replace the starter. VW starters seem to like to draw a huge amount of power when they start going bad. It has been that way for years. I had an 86 TD did the same thing . I just put a starter in my 2000 jetta 5 or 6 weeks ago that was doing the same thing. If you can wait a few days you can order one from ebay. I got a high torque starter brand new for $79 on ebay. I believe it was from california starter. Just make sure you get the high torque 2 kw starter. The one I got works great even in sub zero temps. The car starts like new now.

Last edited by lifer; February 19th, 2011 at 17:30.
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Old February 19th, 2011, 17:25   #11
Bdpprocessors
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Sweet that definantally beats 130 from the parts stores here. Ill order it today and put it on next week! Strange thing is. I just got in the car and its cranking up perfectly fine now.... Its been taking a long time the past two weeks. But now its fine. Ill order it just to be safe
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Old February 19th, 2011, 17:46   #12
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Next fuel filter interval fill the new filter with diesel or a power service additive that can be found pretty much anywhere. She'll start right up with no wear on the starter. Hope u get it figured out.
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Old February 19th, 2011, 17:51   #13
Bdpprocessors
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Im sure i just destroyed the brushes on it when i was oriming the system
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Old February 19th, 2011, 18:13   #14
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I would recommend nothing less than a Bosch reman starter if you are going to replace it.
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04 Jetta TDI . MFA cluster, e-codes, reverse light mod, LED trunk light. 180K.
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Old February 19th, 2011, 19:33   #15
Frank M
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Why not do a little trouble shooting before you replace an expensive starter it may not need anyway.

Since this occurred right after replacing the fuel filter try to determine if you fuel is draining back into the tank due to an air breach.
check the o-rings are sealed on the thermostatic T and check if all hoses are snug where they attach to the filter. Perhaps the T cracked and is letting air into the system after shut down.

The last thing one should do when buying parts is to buy quality parts from a known source. If you find your starter has really failed buy a quality one such as the Bosch or better yet take it apart and replace the brushes as 95% of the time this is all that is needed to repair a starter.

Fixing a car the shotgun method not prudent, especially in light of INTERNET forums with good advice from experienced technicians.

Trouble shoot don't just shoot.
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