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VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old February 14th, 2020, 14:29   #1
verdigo
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Join Date: Sep 2015
Location: Cave City Kentucky
TDI(s): 98 Jetta
Fuel Economy: 39-45
Default 98 Jetta AHU Stalls and then re-starts

So like the title says it stalls. This happens when under a moderate load but definitely when I stick my foot in it a little bit. I could even say under normal driving. As soon as it stalls all I have to do is cycle the key even without going to the start position and operating the starter. While it is coasting down still in gear with the engine turning, I just cycle the ignition switch to off and back to run and it picks up. I am guessing maybe the shutoff valve/switch on the pump. It only has a half million miles on it though. What do you guys think?

Thanks

Dennis
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Old February 14th, 2020, 14:33   #2
Steve Addy
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Join Date: Aug 2002
Location: Iowa
TDI(s): 97 Mk3
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Quote:
Originally Posted by verdigo View Post
So like the title says it stalls. This happens when under a moderate load but definitely when I stick my foot in it a little bit. I could even say under normal driving. As soon as it stalls all I have to do is cycle the key even without going to the start position and operating the starter. While it is coasting down still in gear with the engine turning, I just cycle the ignition switch to off and back to run and it picks up. I am guessing maybe the shutoff valve/switch on the pump. It only has a half million miles on it though. What do you guys think?
Thanks
Dennis
Any CEL from this activity?

Steve
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Old February 14th, 2020, 15:51   #3
ToddA1
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Join Date: Aug 2011
Location: NJ 08002
Fuel Economy: Dismal
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Something is triggering limp mode and cycling power clears it, until the ecu sees the fault again. If it’s not triggering a CEL, scanning the car will usually find it.

-Todd
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Old February 14th, 2020, 18:11   #4
Mongler98
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Join Date: Mar 2011
Location: Northern MD
Fuel Economy: Race: 12mpg, Gandma:65mpg
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scan for codes. report back
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