3500 RPM Powerband? (1 Viewer)

Joined
Oct 5, 2009
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706
If I have the gas pushed in just enough to keep the tranny from upshifting, at 3500 RPM the LC launches like a turbo just kicked in. It puts you back in you seat and the wife says what are you doing. But before the 3500 RPM mark it's pretty doggy. I think the problem is pre 3500 RPM power. Any idea what could be causing power low end power?
 
Joined
Dec 8, 2006
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New Jersey
What tends to happen on older trucks is the diaphragms inside the regulator and modulator disintegrate and plug up vacuum lines throughout the system. They foul the 3 VSV valves and their associated lines as well.
While your EGR system may have been bypased, you could have masked the problem. I would spend some time going through all the hard lines and make sure they're clear of debris.
 

Toyo Boyo

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Aug 10, 2008
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South Wales, UK
Could be something to do with going from closed to open loop on the fuel ratio.

One of the turbo guys posted a graph of his air/fuel ratio and at about those kind of rpm's his fuel ratio looked like it had dropped off a cliff - it went very rich.

Can't remember the thread it was posted though.
 
Joined
Oct 5, 2009
Messages
706
Ok update.

Seems the power will kick in anytime over about 3000 RPM's. And this past weekend it was running great. I had smooth power all the way up the RPM's. It was a rainy wet weekend in the mid 50's.
 

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