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What is causing this! My friend is going crazy!

My friend has a 2007 Volvo 670 with a D12 465hp engine. He has a big drop in turbo pressure at higher altitude and high ambient temerature. At lower elevation he has up to 36lb boost down to 1200rpm but when he gets to say, 6000 feet with high summer temperature he is down to 15lb!

He has replaced a ton of stuff including the ECU which has a barometric sensor in it.

Any ideas? Please!

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Most Helpful Answer

air to air cooler crack will leak down faster in heat and high altitude.

pressure test, wave heat gun over welds.

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Thank you Snowdrifter, for some reason the system never alerted me to your reply. I have passed this info on, Thank you again.

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Try checking your EGR, my boost pressure was all over the place, finally I unplugged it from my ISX and my boost went back to normal and gained about 1/2 mile per gallon.

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Owen Kingsland will be eternally grateful.
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