Cruise control issue
Thread Starter
Intermediate
Joined: Jun 2008
Posts: 45
Likes: 0
From: Reddick FL
Cruise control issue
I noticed today that the Cruise control did not want to engage.
It did after several tries. Then it just dis-engaged while driving
down I75. I re-engaged it - it went about 3 miles and dis-engaged
once more.
Any ideas where to start?
Larry Sikes
http://rockridgefarm.com
mailto:larry@rockridgefarm.com
Visit the forum at the farm.
It did after several tries. Then it just dis-engaged while driving
down I75. I re-engaged it - it went about 3 miles and dis-engaged
once more.
Any ideas where to start?
Larry Sikes
http://rockridgefarm.com
mailto:larry@rockridgefarm.com
Visit the forum at the farm.
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
Try pulling the brake pedal up when you engage it. Put your foot behind the pedal and pull it up. If that works it is the vacuum dump switch just above the brake pedal. To fix it pull the knee bolster push the pedal toward the firewall and push the switch in the same direction it will click forward. Release the pedal and pull back easily to the normal position. You will here some clicking as it self adjusts. Very common problem with the cruise control the switch must be made for the vacuum to hold and when you hit the brake the dumping of vacuum turns it off.
Safety Car
Joined: Oct 2007
Posts: 3,816
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From: :45 minutes from everywhere / E-I-E-I-O
Highly likely a vacuum leak.
Disconnect and temporarily cap the vacuum feed to the cruise control. See if the idle levels off completely...
ed.:
OR the switch that dumps vacuum that red referred to needs adjustment.
Does the cruise cut off with PERFECT regularity? (you said every about 3 miles)
Disconnect and temporarily cap the vacuum feed to the cruise control. See if the idle levels off completely...
ed.:
OR the switch that dumps vacuum that red referred to needs adjustment.
Does the cruise cut off with PERFECT regularity? (you said every about 3 miles)
Last edited by schrade; Aug 6, 2008 at 12:05 AM.
Thread Starter
Intermediate
Joined: Jun 2008
Posts: 45
Likes: 0
From: Reddick FL
Checked it out
I checked for a vac. leak. Did not find one.
I think it may be the push button in the control.
If I play with the button it will engage and seems to stay
on better today.
I think it may be the push button in the control.
If I play with the button it will engage and seems to stay
on better today.
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Safety Car
Joined: Oct 2007
Posts: 3,816
Likes: 0
From: :45 minutes from everywhere / E-I-E-I-O
A new car on the dealer's lot with a vacuum hose unplugged will lope idle. A 30 year-old lawnmower with its carburetor not tightly bolted down (vac leak) will lope idle.
Warm it up, put a brick next to the pedal or block the TB arm - anything to increase idle to STEADY rpm's, and spray starting fluid, a little at a time, everywhere there's vacuum. EVERYWHERE.
When the spray gets sucked into a hole, you get a surge in revs, and you found [one] leak. And you might have more.
Since your cruise has problems, follow that vacuum route.
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
I told you exactly what to do above. Readjust it it takes 5 min.The switch button will not cause it to turn off just on. You can pull the turn signal stem and disassemble it and clean with electrical contact cleaner. No big deal.
Last edited by Redeasysport; Aug 7, 2008 at 12:15 PM.
Safety Car
Joined: Oct 2007
Posts: 3,816
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From: :45 minutes from everywhere / E-I-E-I-O
If his pedal switch IS the problem, can he confirm this, without blindly adjusting the release switch?
I'm not exactly understanding the test either...
Now I'm seein' he said not regular dis-engagement. This does lean to the switch.
OP - When it cuts off, have you tried to resume it right away? What happens? Does it ALWAYS resume right away?
I'm not exactly understanding the test either...
Now I'm seein' he said not regular dis-engagement. This does lean to the switch.
OP - When it cuts off, have you tried to resume it right away? What happens? Does it ALWAYS resume right away?
Last edited by schrade; Aug 7, 2008 at 12:24 PM.
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
If his pedal switch IS the problem, can he confirm this, without blindly adjusting the release switch?
I'm not exactly understanding the test either...
Now I'm seein' he said not regular dis-engagement. This does lean to the switch.
OP - When it cuts off, have you tried to resume it right away? What happens? Does it ALWAYS resume right away?
I'm not exactly understanding the test either...
Now I'm seein' he said not regular dis-engagement. This does lean to the switch.
OP - When it cuts off, have you tried to resume it right away? What happens? Does it ALWAYS resume right away?
Le Mans Master
Joined: Nov 2006
Posts: 5,032
Likes: 204
From: Greenwood Indiana
2021 C4 of the Year - Modified Finalist
C4 of Year Finalist (appearance mods) 2019
I adjusted my pedal switch today. (No cruise since I replaced the power-brake booster last fall.) If I pulled up on the pedal and pushed the cruise button, it worked. As soon as I took my foot out from under the pedal, it shut off.
It's easy to adjust. Lift the pedal as high as you can and then push the switches toward the pedal until they quit clicking (bottom-out).
I took it for a test-drive and it's working correctly now. (I wish I would have done that before I drove down to the Corvette Museum back in May)
It's easy to adjust. Lift the pedal as high as you can and then push the switches toward the pedal until they quit clicking (bottom-out).
I took it for a test-drive and it's working correctly now. (I wish I would have done that before I drove down to the Corvette Museum back in May)
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
I adjusted my pedal switch today. (No cruise since I replaced the power-brake booster last fall.) If I pulled up on the pedal and pushed the cruise button, it worked. As soon as I took my foot out from under the pedal, it shut off.
It's easy to adjust. Lift the pedal as high as you can and then push the switches toward the pedal until they quit clicking (bottom-out).
I took it for a test-drive and it's working correctly now. (I wish I would have done that before I drove down to the Corvette Museum back in May)
It's easy to adjust. Lift the pedal as high as you can and then push the switches toward the pedal until they quit clicking (bottom-out).
I took it for a test-drive and it's working correctly now. (I wish I would have done that before I drove down to the Corvette Museum back in May)
Le Mans Master
Joined: Nov 2006
Posts: 5,032
Likes: 204
From: Greenwood Indiana
2021 C4 of the Year - Modified Finalist
C4 of Year Finalist (appearance mods) 2019
That's exactly how my FSM says to do it.
"Hold brake pedal fully rearward against pedal stop and push each switch into retainer one-at-a-time until stopped by brake pedal and audible "click" sound stops."
Page 9B-5. (94 FSM)
"Hold brake pedal fully rearward against pedal stop and push each switch into retainer one-at-a-time until stopped by brake pedal and audible "click" sound stops."
Page 9B-5. (94 FSM)
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
Le Mans Master
Joined: Jan 2003
Posts: 5,858
Likes: 7
From: Santa Maria CA
I bought a used lever from Corvette Salvage for about $30. I asked for a clean peice with the white letters and graphics nice and visible and not faded out. They delivered exactly. It looked brand new.
