Td5 with altitude sickness

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Originally Posted by sierrafery

why would you save a data log with AAP unplugged? just to see the default mode with reduced boost? ... your problem according to the data log is that the ECU cuts fuelling due to high MAF input which is normal as long as the sucction is too high due to a sh*t tuning...cos IMO any tuning which involves a boost box to alter the MAP reading is **** while stating that the MAF is "uprated" but it reads up to 680 max and cuts out is a lie IMO.

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I bought the truck with this set up; wouldn't be my choice if I had one.

- driving with AAP unplugged at altitude will proof or eliminate if this is the culprit for my initial problem
- as I said, the engine runs fine anywhere below 850m above sea level
- the seller of the MAF told me that he had a high failure rate with this modified MAF. However, I find it weird that it cuts out at 680 just like a standard one.

So, what's the alternative to using the boost box??

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Originally Posted by jbe

So, what's the alternative to using the boost box??

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A proffesional and correct remap with uprated MAP sensor and addapted AFR not an ugly bodge with boost box like now IMO

Looks like it is the AAP. I did another test run at altitude after I cleaned all sensors for the fourth time and checked vacuum & turbo hoses over again. Had the same problem, although a bit more subtle. When I disconnected the AAP, the engine ran just fine. Thanks everyone for their input [bigsmile1].

The AAP reading looked well in that data log, by unplugging it the ECU goes to a default of reduced boost to 1 bar and at that boost the sucction is lower so the MAF readinng doesnt exceed 680 to cut out, make a test with MAF unplugged too and IMO it will run OK as well, i'm affraid that you'll pay for an expensive AAP in vain