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chrismsnt
Samba Member
Joined: March 06, 2018
Posts: 247
Location: Cumming, GA
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 Posted: Fri Jul 30, 2021 11:44 am Post subject: 1.9 TDI engine dying |
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Okay... coming to wits end! I have a 1.9 TDI AHU block with Passat AFN ancillaries in the shop. It appears that runs fine until it's hot outside and then the engine just dies under load (like accelerating to get onto highway). The mechanic has been stumped for 15 weeks now throwing parts at it... any thoughts or ideas? I'm game!
When attempting to grab engine codes via VCDS, when the engine dies the computer loses connection to engine. The battery drops from like 12.4v to 8.1v. Those are just some random items which occur during the dying. Turn it off.. wait a min or so and it starts right back up.
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Chris
1989 T3 Vanagon 16" Syncro
1967 Squareback
https://vwvandiesel.com
Instagram @VW_VanDiesel |
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DigiMatrix
Samba Member
Joined: April 20, 2010
Posts: 449
Location: Up North Canada
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| Posted: Fri Jul 30, 2021 12:21 pm Post subject: Re: 1.9 TDI engine dying |
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I don't know how the wiring was done, but if has the Diesel relay setup from the donar car, I would say - replace relay 109.
Bad contacts/solder joints in relay 109 cause this sort of problem.
Even if it doesn't use relay 109, look at the relay providing power to the ECU.
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_________________
'91 Syncro Westfalia
soon to be 2.5 liter stroker WBX 10:1 comp
Digifant ECU with knock sensor and custom
cylinder selective knock control by me |
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chrismsnt
Samba Member
Joined: March 06, 2018
Posts: 247
Location: Cumming, GA
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| Posted: Fri Jul 30, 2021 12:38 pm Post subject: Re: 1.9 TDI engine dying |
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| DigiMatrix wrote: |
I don't know how the wiring was done, but if has the Diesel relay setup from the donar car, I would say - replace relay 109.
Bad contacts/solder joints in relay 109 cause this sort of problem.
Even if it doesn't use relay 109, look at the relay providing power to the ECU. |
Yea... the 109 has been brought up several times and I think swapped. However, would that really cause the voltage drop?
_________________
Chris
1989 T3 Vanagon 16" Syncro
1967 Squareback
https://vwvandiesel.com
Instagram @VW_VanDiesel |
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DigiMatrix
Samba Member
Joined: April 20, 2010
Posts: 449
Location: Up North Canada
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| Posted: Fri Jul 30, 2021 2:10 pm Post subject: Re: 1.9 TDI engine dying |
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Absolutely yes it will. I had the issue on my 1996 diesel Passat, and also had it on relay 30 on my son's Corrado. It took me 2 days to track it down on the Corrado. I was logging data and watched the voltage drop off until the engine stalled. It was the relay.
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_________________
'91 Syncro Westfalia
soon to be 2.5 liter stroker WBX 10:1 comp
Digifant ECU with knock sensor and custom
cylinder selective knock control by me |
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