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Sounds like you're experiencing 'boost-drop'. When the ECU detects detonation, it deactivates the boost soleniod to bleed off boost and cuts timing to keep damage from occuring to your engine. The only way to reset it is to shut off the engine and restart. I would check the codes to see if your getting a knock sensor code.
My 03 does the same thing in hot weather. It's like a different truck when it is cool outside. I am going to do the knock sensor relocation to see if it helps with mine.
I'd say you've got a leaky BVA. Put a vacuum pump on it and see if it holds vacuum.
I eliminated my BVA and installed a manual cable in it's place. Boost trigger on the shifter. My best mod.
Bump the base timing up a degree or 2.
Get a boost/vacuum guage.
How did you know your BVA was bad? Was your truck performing similar to mine? Did you have a vacuum issue? The valve is only $46 to replace.
I HAVE FOUND THE PROBELM!!!!!!!!!!!!!!!!!!!!!!
Apparently for some reason, AFTER the knock sensor relocation, and everything I have done to rectify it, with the truck throwing NO CODES, it's running in "fail safe mode"!
Every time the ignition is shut off, the solenoid which controls the S/C BAV, is reset. For this reason, the truck has balls when it's cold, and every time I stopped, shut the truck off, and restarted it. For whatever reason, when the truck warms up, the ECM puts the S/C into bypass mode, controlling the BAV solenoid. If your BAV is located in the 12 O'clock position, the S/C is creating boost and everything is working correctly. When the BAV is in the 9 O'clock position, your S/C is in fail safe mode. To prove this theory, I removed the vacuum line which pulls the BAV to the 9 O/clock position and plugged by inserting a wire nut. With the truck warmed up, and the mode fail safe bypassed, THE TRUCK HAS HUGE BALLZZZZZ, it's like driving a different truck. Now my question is......what is throwing my truck into fail safe mode, bypassing the S/C after all of the following that I've done:
new fuel filter
cleaned throttle body
new rotor and cap
cleaned the MAFS
cleaned the throttle body
pulled a plug, it looks great, plugs are 1 year old 10K miles on them
tried two different fuel injection cleaners, two full tanks of fuel
checked for vacuum leaks, none found
cleaned my air filter (K&N)
Wires look great
I know I'm not the only one with this problem, and I will be dammed if I'm gonna let someone else go through what I have with this truck!
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