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Old 08-09-2008, 03:38 PM
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Thought The world was ending

So here is my truck
CFM+ Largemouth
mbrp 4" turbo back
looney tune

Its 81 degres out, driving home from work, going up a steep grade, only thing on truck is racks and a bed full of tools (probably like 800lbs).

Egt's are around 900, then all of a sudden while climbing the boost bounces from 10 to 20 and back and fourth, truck is shuddering real bad, egt's get up to 12,000's so when it stops bucking, I get over and drop my speed form the 75 i was going, to about 55, where it stays about about 900. Stays like that for about 5-10 minutes, then drives perfectly fine all the way home.

What happened, should I be worried?

So after about 30 minutes of perfectly normal driving, get home, let egts get down to about 300, then shut her down, and pop the hood, to notice a hissing coming from the passenger side. Never noticed this before, but never had a need to notice it either ya know. thansk
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Old 08-09-2008, 04:22 PM
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You mean 1,200's? Hissing might be the AC.
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Old 08-09-2008, 04:24 PM
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All are your air and exhaust tubes on tight? Did you get a CEL? What year is your truck?


May be this?
2003-05 Various Running Problems, Check Engine Light; New EBP Sensor:
Trucks built before 1-17-05 that exhibit buck/jerk, hesitation, lack of power, stalling, stumble, black smoke, surging, rolling idle, changes in engine sound at idle or when driving at a steady speed, or with the trouble codes P2263 or P0299, may have an exhaust backpressure sensor signal that is incorrect or erratic. A revised EBP sensor is available if this is found to be the case. Part number 4C3Z-9J460-A. Broadcast Message 3815.
Normal EBP signal reading should reflect atmospheric pressure with the key on/ engine off. Typically, this is 14.7 PSI/0.88-0.9 volts at sea level, decreasing one PSI/0.10 volt for every 2000 feet of elevation. It should be within 0.5 PSI of BARO and MAP sensor pressure signals.
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Old 08-09-2008, 04:27 PM
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yeah sorry 1,200

no cel

ill check the boost tubes again to make sure they are tight, but I have driven about 500 miles since i messed with them no issues.
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