IROC Z cruise control
Thread Starter
Member
Joined: Sep 2009
Posts: 211
Likes: 1
From: Portland, OR
Car: 1988 Camaro Iroc-Z
Engine: 305
Transmission: T-5
Axle/Gears: 3.08
IROC Z cruise control
so i have 88 iroc and suddenly the cruise control stopped working
i replaced the switch and that didnt help
the wierd thing is when i accalarate from the switch it does work but would not stay on...any ideas??
i noticed there is no fuse for the cruise control maybe a relay??
where do i start to troubleshoot?
i replaced the switch and that didnt help
the wierd thing is when i accalarate from the switch it does work but would not stay on...any ideas??
i noticed there is no fuse for the cruise control maybe a relay??
where do i start to troubleshoot?
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: IROC Z cruise control
so i have 88 iroc and suddenly the cruise control stopped working
i replaced the switch and that didnt help
the wierd thing is when i accalarate from the switch it does work but would not stay on...any ideas??
i noticed there is no fuse for the cruise control maybe a relay??
where do i start to troubleshoot?
i replaced the switch and that didnt help
the wierd thing is when i accalarate from the switch it does work but would not stay on...any ideas??
i noticed there is no fuse for the cruise control maybe a relay??
where do i start to troubleshoot?
Troubleshooting hints:
1. If the Tap-Up and Tap-Down functions are the only faults in the system, replace the CRUISE CONTROL MODULE.
2. If the complaint involves rough throttle action in Cruise Control, check the resistance of the Servo Position Coil in the CRUISE CONTROL SERVO. Replace the Servo if the coil is open.
3. Check vacuum hoses for leaks, kinks, or restrictions before starting electrical troubleshooting.
4. Check for minimum slack in cruise control servo throttle linkage
5. Visually check the cruise control wire and ground connections.
6. Check the GAGES FUSE.
JamesC
Thread Starter
Member
Joined: Sep 2009
Posts: 211
Likes: 1
From: Portland, OR
Car: 1988 Camaro Iroc-Z
Engine: 305
Transmission: T-5
Axle/Gears: 3.08
Re: IROC Z cruise control
thanx for the info looks like good place to start
only thing is...i dont know where is all these cruise control assemblys that you described are located....i run on a tpi setup....if you can guide me to the location it would be great...a pic would be very helpful...thanx
only thing is...i dont know where is all these cruise control assemblys that you described are located....i run on a tpi setup....if you can guide me to the location it would be great...a pic would be very helpful...thanx
Junior Member
Joined: Mar 2010
Posts: 2
Likes: 0
Re: IROC Z cruise control
I just fixed mine '89 iroc - had multiple problems:
1) Broken vacuum hose to the servo - check vacuum hoses first.
2) Vacuum hose to servo should be "T" hose, the other end goes to 6" diameter round orb under vacuum canister. My "orb" had its nipple broken off, fixed that with epoxy, rubber hose, and new nipple.
3) Still not working - used ohmeter and found accel button not working. Theres 4 wires from steering column. Under dashboard this becomes gray, pink, blue, and black-gray. When you turn cruise on, you should continuity between pink and gray wires. When you press coast, you should have continuity between blue and gray wires, when you press accel, should have continuity between black-gray and gray wires. Gray is the ground. I had to rewire a pushbutton switch in place of my open black-gray wire to fix it. All works great now. Hope this helps.
1) Broken vacuum hose to the servo - check vacuum hoses first.
2) Vacuum hose to servo should be "T" hose, the other end goes to 6" diameter round orb under vacuum canister. My "orb" had its nipple broken off, fixed that with epoxy, rubber hose, and new nipple.
3) Still not working - used ohmeter and found accel button not working. Theres 4 wires from steering column. Under dashboard this becomes gray, pink, blue, and black-gray. When you turn cruise on, you should continuity between pink and gray wires. When you press coast, you should have continuity between blue and gray wires, when you press accel, should have continuity between black-gray and gray wires. Gray is the ground. I had to rewire a pushbutton switch in place of my open black-gray wire to fix it. All works great now. Hope this helps.
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