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Old 08-21-2023   #1
combja
 
Join Date: Oct 2018
Location: normal, il
Posts: 5
Default cruise control drops out

My cruise control will set, drop out when braking and resume normally, then just drop out randomly.
Then, sometimes it will Resume on demand, sometimes not. Sometimes it can be re-set, sometimes not.
Turn it off/on then sometimes it sets, sometimes not.
Wait awhile, turn it on, set it and it will work for a while, then randomly drop out.
Any suggestions?
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Old 08-21-2023   #2
GOLDCYLON
 
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Location: Peoria, AZ
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Default Re: cruise control drops out

Quote:
Originally Posted by combja View Post
My cruise control will set, drop out when braking and resume normally, then just drop out randomly.
Then, sometimes it will Resume on demand, sometimes not. Sometimes it can be re-set, sometimes not.
Turn it off/on then sometimes it sets, sometimes not.
Wait awhile, turn it on, set it and it will work for a while, then randomly drop out.
Any suggestions?
Do you have a FSM? There is a helpful diagnosis tree to follow.
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91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat

90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat

11 RED/GREY CTS-V
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Old 08-23-2023   #3
Young1
 
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Location: Ocala, FL
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Default Re: cruise control drops out

Yes FSM. Check 30 year old vacuum hoses for cracks at bend going into module above battery. Probably minutely cracked. Trim off an inch or so and reinsert.
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Old 08-24-2023   #4
combja
 
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Default Re: cruise control drops out

What is a FSM?
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Old 08-24-2023   #5
WARP TEN
 
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Default Re: cruise control drops out

Quote:
Originally Posted by combja View Post
What is a FSM?
Factory Shop Manual or more correctly Factory Service Manual. They have diagnostic schemes for finding a vacuum leaks or other malfunctions. --Bob
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Last edited by WARP TEN; 08-25-2023 at 09:42 AM.
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Old 08-24-2023   #6
GOLDCYLON
 
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Location: Peoria, AZ
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Default Re: cruise control drops out

Quote:
Originally Posted by Young1 View Post
Yes FSM. Check 30 year old vacuum hoses for cracks at bend going into module above battery. Probably minutely cracked. Trim off an inch or so and reinsert.
Also check for cracks on the vacuum line supply in the middle of the passenger side of the plenum
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GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's)

GOLDCYLON - 11 CTS-V


Arizona State Director




91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat

90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat

11 RED/GREY CTS-V
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Old 08-28-2023   #7
Thomas ZR-1
 
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Default Re: cruise control drops out

Check the vacuum switch down on the brake pedal...often cause leaks in the system.
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