88Slowbird
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Joined:
May 2019
Tampa, FL
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I've got a 5 speed 88 TC that's only getting 9-10 PSI with the premium switch on
pulls 19-20 vacuum at idle
I have an aftermarket Autometer boost gauge that shows vacuum and boost up to 30 PSI
Haven't found any vacuum leaks, has a new air filter if that matters
where should I look next?
1988 TC (Mach 1 edition): Steeda Tri-Ax shifter, manual boost controller, Stinger FMIC, Forge blow off valve
1985 SVO: Pro 5.0 Shifter, Boport valve springs, Ranger R Cam, Manual boost controller
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Jeff K
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Joined:
Apr 2001
Milwaukee, WI
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BCS or fuel switch relay may have failed or you may have a wiring issue.
Do yourself a favor and pitch the stock boost control system and get a Gillis manual boost controller which will let you set max boost to anything you want. Plus you will get max boost in all gears and boost will come in quicker.
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.
11 Crown Vic Interceptor
14 Toyota Camry (wifes car)
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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88Slowbird likes this post
anasazi4st
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Joined:
Feb 2015
Phoenix, AZ
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(12-06-2019, 02:13 AM)Jeff K Wrote: BCS or fuel switch relay may have failed or you may have a wiring issue.
Do yourself a favor and pitch the stock boost control system and get a Gillis manual boost controller which will let you set max boost to anything you want. Plus you will get max boost in all gears and boost will come in quicker.
^^^^ +++++
I’ve done that and I’ll never go back to the BCS.
Another proud dues-paying member.
1987 Turbo Coupe w/T5OD, 8.8 axle, grey smoke; most options. Got it in 1991 with 41K miles: 3 turbos, 2 heater cores, 3 T5OD full rebuilds, 6 clutches, 1 head gasket, 2 Teves II ABS units, etc. later....
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Kuch
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Joined:
Sep 2016
Manlius, NY USA
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Slowbird, I had a similar issue with my 88 TC after checking multiple things I found that the wastegate actuator road was seized up on the flapper on the turbo. It looked like it was somehow welded to the pivot and I had to pry it off and then sand it down and re-install. As it wouldn't pivot and close, it was only building low boost, if you have a vacuum tester, something like a mightyvac you can hook it up to the wastegate and put some air pressure on it to check movement. just something else to check out
1988 Turbo Coupe, Black/Black, 5 Speed, Moonroof, T3/T4, ported E6, 255LPH, Kirban, Stinger Exhaust, MGW shifter, K&N, Gillis valve, BP1.5, PIMPx, Koni's
1964 Ford Galaxie 500XL, 390 6V, Big Solid cam, Headers,3.89's, 4 Speed, Vast and fast
1960 Ford Starliner, 292 Y Block, 312 4bbl intake, headers, 3 Speed, slow and low
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