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3800 sc high ltft

H

hollas13

New member
Alright ive got a 98 gtp. 3.4 mps, headers, 1.9 rockers, open cone, 104al, zzp tune :(. recently scanned and saw loss of boost and increase in kr. went from 9.5-10psi to down around 8psi at wot and under 2*kr to around 5. also ltft are stuck at 16.4. wondering what a couple possible causes could be. vac leak fueling issue ect. also getting random lean codes.
 


more than likely it is a vacuum leak. I have a propane blow torch that I use to check for leaks, just dont ignite the flame, and when the engine rpm changes from the gas entering the leak area that how you know. an exhaust leak could do the same thing, but wouldn't cause any random misfires.
 
never thought to check before. didnt have any issues until latley. exhaust leak vac leak. will check vac leak soon. thanks guys. any other ideas please comment
 


Spray brake cleaner around the base of your blower, throttle body, and all of the vacuum lines. Monitor your STFT's when you do this, and you'll probably find the leak.
 
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