North American Turbocoupe Organization



PRC not auto firming
bhazard Offline
Posting Freak
#1
Noticed another problem earlier. When I have the switch on auto it wont go to firm by itself. It stays soft. It goes to firm if I switch it to firm, but is otherwise always soft.

Ideas? PRC computer probably?
88 TC, 170k, K&N, $5 Boostvalve, Stinger 3" ex., 3" Magnaflow, 3" Stinger tail, Zoom clutch
15.26 @ 86mph, 2.18 60' killed valvetrain & headgasket
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Turbojet Offline
Senior Member
#2
Are you sure the switch is still good ? I had one that did the same thing but, the switch was bad.
The Family:
86
87
88
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bhazard Offline
Posting Freak
#3
The switch has to be good, it switches to firm when I switch it, and then goes back to soft when I switch to auto.
88 TC, 170k, K&N, $5 Boostvalve, Stinger 3" ex., 3" Magnaflow, 3" Stinger tail, Zoom clutch
15.26 @ 86mph, 2.18 60' killed valvetrain & headgasket
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Gary F Offline
Senior Member
#4
Sounds like it's working correctly to me. If it's set on Auto it will remain soft unless and until you do hard cornering or if you reach a certain speed. I think it's 80. If it doesn't automatically go to Firm under those conditions Turbojet might be right.
Gary Fraser

I used to be normal...then I got a Turbo Coupe.
'88 T5 Bone Stock w/3G Alt.
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xcrunnerbd Offline
Posting Freak
#5
I find the easiest way to make mine go firm is to hit the brakes hard (for some reason this wording just sounds bad).
Project 13 sec. / 30mpg in '88 TC 5Speed : [email protected] / 32+ mpg

On The Car: KN cone, 2-stage [email protected] 15psi wired to fuel switch, Kirban AFPR @ 39psi, Walbro 255 HP FP, 130A 3G Alt., Full 3" Stinger Exhaust incl. cat. no muffler,

Shelf: .48 T3, ported E6, BPV
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Jeff K Offline
Administrator
#6
PRC will go to firm mode if brake psi exceeds 400 psi, speed over 83 mph, rapid or large steering wheel movement, throttle over about 70%, over .3g lateral acceleration, infered boost over 10 psi. After a start, the steering wheel angle / rate sensor takes a while to "calibrate" and learn "straight ahead" wheel position. This can take up to a few minutes to do depending on driving speed, how many turns you make, etc.

The PRC switch is just an on/ off switch. If the switch is closed (on), system will be in firm all the time. If switch is open (off), system will be in auto mode. In other words, if you disconnect the switch / cut the wires to the switch, etc, system will always be in auto mode.
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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Noname
Guest
#7
When it is in auto firming mode, does the dash light blink three times every 30 seconds or so? If so, I believe that means some of your PRC gizmos are bad. I have this problem, but haven't looked into whether it is a sensor or an actuator... You could probably test both with the right equipment, however. Let us know how it goes...
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Pete D Offline
Administrator
#8
Troubleshooting help here:
http://www.turbotbird.com/FAQpage/FAQpag...20Problems
Pete Dunham


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bhazard Offline
Posting Freak
#9
Yeah I know what turns the firm on, and it aint doing it at all. Auto = Soft all the time now. I also havent noticed any blinking, but Ill keep an eye out for it.
88 TC, 170k, K&N, $5 Boostvalve, Stinger 3" ex., 3" Magnaflow, 3" Stinger tail, Zoom clutch
15.26 @ 86mph, 2.18 60' killed valvetrain & headgasket
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bhazard Offline
Posting Freak
#10
Okay guys, so it suddenly started working on its own.
88 TC, 170k, K&N, $5 Boostvalve, Stinger 3" ex., 3" Magnaflow, 3" Stinger tail, Zoom clutch
15.26 @ 86mph, 2.18 60' killed valvetrain & headgasket
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