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VW B5 Passat TDIs This is a general discussion about B5 Passat(>98 (2004-2005 in North America)). Non TDI related postings will be moved or removed.

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Old August 9th, 2018, 18:16   #1
gtrosema
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Join Date: Oct 2013
Location: SC
TDI(s): 2002 Jetta
Default Tps >

Yesterday I left for work and car took off fine then lost power. Still running but no boost. Ran codes and had boost code, drove the next day before running codes and ran fine. After reading codes and clearing I was looking into things and noticed that my TPS did not change. But somehow engine reved up and had power.

Confused.

Going to check at TPS in morning but thought I would see if anyone else had similar issues
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Old August 9th, 2018, 19:32   #2
QuickTD
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It is not an issue. A generic scan tool will show the position of the anti-shudder valve in the intake, which is always fully open when the engine is running. The value will nearly always be 100%.

A diesel runs unthrottled, there is no real "TPS", so I wouldn't waste time looking. Engine speed is controlled by fueling alone.

Your boost code is probably due a leak in the turbo's vacuum vane control system or boost leak at one of the post turbo intake hoses.
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Old August 10th, 2018, 03:44   #3
gtrosema
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I thought the gas pedal had a potentiometer on it. That is where I am getting the TPS in my head. The VAG showed 1.65 can't recall if it was volts or %. I was in the 060 measuring block, and in the 002 and 003 if my memory is correct. But both places it did not climb.
Sorry 05 Passat.
Anyway I was kind of thinking the waste gate had hung open,
the rpms climbed but no power to get out of its own way. 225k might be time to look into rebuilding turbo.
Thanks for your thoughts
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Old August 10th, 2018, 09:37   #4
zzdiesel
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That is only roughly 4500 hours. Nothing for a turbo. Should easily do 10000.
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Old August 10th, 2018, 09:41   #5
Scubanero
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No waste hate to hang open. Most likely you are seeing turbo limp mode as described by QuickTD. And whatever you call it, the skinny pedal on the right has to talk to the ECU so it has a position sensor.
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Old August 15th, 2018, 08:11   #6
gtrosema
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By waste gate I meant the vanes stuck open. Changed oil this weekend and hasn't happened since the first time. Think I have put over 500 miles on it since then. Hopefully just a one time deal? Ordering vacuum hoses and going to change some that look like they need to be replaced.
thanks the insight.
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