North American Turbocoupe Organization



Boost Leak?
DanMarshall Offline
Junior Member
#1
I recently noticed that when I accelerate hard my boost gauge gets to about 15PSI, holds strong and then slowly decreases to about ten while still at full throttle.

Is there anything I can check over or do to help this problem?
1988 TurboCoupe 5 Speed 130,000 miles
1998 Ford Escort SE (Daily Driver)
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Jeff K Offline
Administrator
#2
If it was a boost leak, I would think you would have problems with a rich air-fuel ratio due to the escaping pressurized air. I would start by looking at possible problems with the wastegate and the turbo itself. DOes the turbo make any screeching noises, etc?
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Pete D Offline
Administrator
#3
I agree with Jeff that first looks ought to be the turbo and the WG
Take the VAM hose and the inlet tube off the turbo. Check the shaft for side play and end play. The should be almost none. Look for witness marks on the compressor housing and the back plate. Witness marks would be a sure sign of the compressor blades hitting the housing.
Pete Dunham


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DanMarshall Offline
Junior Member
#4
There is no sounds coming from the turbo and the car does smell like it is running a bit rich.
1988 TurboCoupe 5 Speed 130,000 miles
1998 Ford Escort SE (Daily Driver)
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Pete D Offline
Administrator
#5
Then pull the code and if it is rich run the fuel system diagnostic the help find out why.
Pete Dunham


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