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post #1 of 2 Old 09-17-2013, 09:36 PM Thread Starter
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Results CCT, BUZZ etc

OK ran some tests heres the results:

checked engine cold
Key On Engine Off
Manifold absolute pressure: 12.6 psi
Oil temp matched ambient temp +/- 2

Checked for stored codes:
DTC
p0605 NO CEL ON

Key On Engine Off Tests
p0605

Buzz Pass

Key On Engine Running Tests
P1247
P0284

CCT
p0284

Key On Engine Running
Change Rotational Velocity PERDEL
CYL
3 2.3 avg
8 5.3 avg

All others read 0.0 to 0.2

Engine At Idle:
icp press 470-480 idle warm
icp duty 9.5 idle
Icp volts 0.85


HPOP TEST
WOT RUN 60MPH-90MPH 3rd Gear
ICP PSI Duty Cycle %
1865.50 15.5 Part Throttle
2762.62 20.3
2805.61 23.2
2779.59 24.1
2834.46 24.4
2832.19 24.8
2871.22 25.1
2924.40 25.3
2948.15 24.2
1528.38 16.6 Lift Off



Also noticed my Exaust Back Pressure PSI running 4-5psi higher than Manifold Absolute Pressure

Diagnosis????
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post #2 of 2 Old 09-17-2013, 10:24 PM
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What your problem with the truck? Your exhaust back pressure (EBP) and turbo boost are fine if your only 4-5 difference. Typically you wanna see a EBP/turbo (manifold) psi at 2/1 when spooled up. Some times the EBP can be higher until the turbo lights! Only other real problem (besides codes) I see is your IPR duty cycle % seems low. I thought 14% was normal at idle.

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