ZR-1 Net Registry Forums  

Go Back   ZR-1 Net Registry Forums > C4 ZR-1 > C4 ZR-1 Technical Postings

Reply
 
Thread Tools Display Modes
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?
combja is offline   Reply With Quote
Old 08-21-2023   #2
GOLDCYLON
 
GOLDCYLON's Avatar
 
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,152
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.
__________________
GOLDCYLON - 91 ZR-1 #2014
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
GOLDCYLON is offline   Reply With Quote
Old 08-23-2023   #3
Young1
 
Young1's Avatar
 
Join Date: Sep 2016
Location: Ocala, FL
Posts: 870
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.
__________________
Steve Young
1991 ZR-1 Quasar Blue Metallic/Black #729
Second Owner
1991 ZR-1 Dark Red Metallic/Black #2040
SOLD

1990 ZR-1 Dark Red Metallic/Saddle #1670
SOLD
Double your happiness.....complain half as much.
Young1 is offline   Reply With Quote
Old 08-24-2023   #4
combja
 
Join Date: Oct 2018
Location: normal, il
Posts: 5
Default Re: cruise control drops out

What is a FSM?
combja is offline   Reply With Quote
Old 08-24-2023   #5
WARP TEN
 
WARP TEN's Avatar
 
Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,030
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
__________________
2016 Long Beach Red Z06 #10281 "POPS Z"
1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts
--Sold but still running strong
1993 Quasar Blue #161 "HIL KING"
--Sold but still running strong, now with more than 120,000 miles
1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd
--Sold a long time ago
ZR-1 Net Registry Founding Member #95
NCM Lifetime Member
Favorite Quote--Attributed to Mickey Thompson:
"Too Much Horsepower is Almost Enough"

Last edited by WARP TEN; 08-25-2023 at 09:42 AM.
WARP TEN is offline   Reply With Quote
Old 08-24-2023   #6
GOLDCYLON
 
GOLDCYLON's Avatar
 
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,152
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
__________________
GOLDCYLON - 91 ZR-1 #2014
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
GOLDCYLON is offline   Reply With Quote
Old 08-28-2023   #7
Thomas ZR-1
 
Thomas ZR-1's Avatar
 
Join Date: Oct 2012
Location: Germany
Posts: 227
Default Re: cruise control drops out

Check the vacuum switch down on the brake pedal...often cause leaks in the system.
__________________
Best thing in life is a ZR-1 ride
Thomas ZR-1 is offline   Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 06:50 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright ZR-1 Net Registry 2020