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Old 01-25-2021, 04:10 PM   #24 (permalink)
hayden55
Master EcoModder
 
Join Date: Dec 2010
Location: Arkansas
Posts: 813

Sport Utility Prius - '10 Toyota Prius II
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90 day: 37.35 mpg (US)

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Quote:
Originally Posted by COcyclist View Post
The early TDIs were known to suffer from carbon buildup in the intake but much of that happened before low sulphur diesel was available in the US. EGR contributed to carbon buildup so people removed the EGR circuit and replaced it with a straight pipe. This also affects engine heating from cold starts. My buddy did this to his TDI and his biggest complaint is how long it takes to get heat into the cabin.

The EGR cooler helps get some heat into the coolant loop so I did not want to remove mine. I did load a tune that allows EGR when the engine is cold to help the engine warm up more quickly but does not add EGR when the engine is up to temperature. FWIW my car is 16 years old with 110,000 miles and I have not needed to do a carbon cleaning.
Sounds like yours is a bit different with your tune. Not sure what you mean about low sulfur diesel. Had a friend with an 06 tdi that was clogged up in 2010 at 90k miles and it gave up the ghost. To be fair it was probably the cheater tune they had from the factory. They rolled coal so hard i thought it was a factory option for them to have a big black rear end. :P
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me and my metro (05-15-2021)