What usually goes wrong with the cruise control? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bennylava · 10-21-2023, 01:38 AM

I'd like to fix my cruise control on my 87 2wd 700r4 truck. But I've never worked on cruise before, and I'm at a loss on where to start. Anyone know how to diagnose a dead cruise?

I replaced the blinker stalk about 10 years ago, so it's not the factory button. That's about the most help I can give on this problem. Thank you

**kwmech** · 10-21-2023, 04:46 PM

fuse, vacuum source, cable sensor input

**hatzie** · 10-21-2023, 07:25 PM

1987 is likely Cruise III
Look in the manuals post for the Cruise III service training textbook. More will be in the service manuals.

**temp190** · 10-21-2023, 10:49 PM

try to check/adjust the switch on the brake pedal. that was my problem.

bennylava · 10-22-2023, 02:49 AM

Quote:

Originally Posted by hatzie

1987 is likely Cruise III
Look in the manuals post for the Cruise III service training textbook. More will be in the service manuals.

If it turns out that it's not cruise 3, then should I start looking for cruise 4? Or did they name it something else after that

**hatzie** · 10-22-2023, 07:16 PM

Quote:

Originally Posted by bennylava

If it turns out that it's not cruise 3, then should I start looking for cruise 4? Or did they name it something else after that

GM used an electromotor cruise control system on the T400 trucks and the boxy late 1980's through the rounded 1990's B Body Caprice and the F body cars.
I don't believe they used that system on the RV series squarebody trucks.
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Cruise III was used when they phased out the CruiseMaster transducer systems starting in 1982 or 83.

bennylava · 11-02-2023, 04:04 PM

Well upon inspection...

The linkage came off. So I reconnected it to the throttle. It was just laying there. Might have a problem with the cruise if the linkage ain't hooked up. Also made sure it wouldn't come off again.

rick1956 · 11-04-2023, 03:25 PM

Damn, how come it's never the easy stuff with me? Good deal

bennylava · 11-05-2023, 10:30 AM

Quote:

Originally Posted by rick1956

Damn, how come it's never the easy stuff with me? Good deal

My problem is sometimes it will be something easy, but dreading having to fix a big problem, I'll put it off for 6 months. Only to find I could have fixed it in 10 minutes.

**TKCR** · 11-05-2023, 10:50 AM

That’s what mine was also. PO must have just disconnected it, but it was there, just not hooked up.

bennylava · 11-06-2023, 02:42 PM

Quote:

Originally Posted by TKCR

That’s what mine was also. PO must have just disconnected it, but it was there, just not hooked up.

I think they just come loose on their own. I believe this may be the second time it's happened to me. Several years ago when I was tired of working on the truck, the cruise broke along with a few other things. I used to know a good mechanic who has since retired, and he didn't charge me to fix the cruise. Just the fees for the other stuff. He probably just hooked that back up.

But I noticed it didn't have the little... retainer ring or whatever it is that keeps it attached to the throttle. So I added a stout rubber one which seems to function well. Also, the gap in the hook (on the opposite end) is very wide. It could easily slip off if the other end lets go first. I put a piece of rubber on the end of the hook, so it can't fall off again. Otherwise it may fall off the engine going down the road, and be lost.

10-21-2023, 01:38 AM	#1
bennylava Registered User Join Date: Jul 2017 Location: Texas Posts: 408	What usually goes wrong with the cruise control? I'd like to fix my cruise control on my 87 2wd 700r4 truck. But I've never worked on cruise before, and I'm at a loss on where to start. Anyone know how to diagnose a dead cruise? I replaced the blinker stalk about 10 years ago, so it's not the factory button. That's about the most help I can give on this problem. Thank you

10-21-2023, 04:46 PM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,634	Re: What usually goes wrong with the cruise control? fuse, vacuum source, cable sensor input

10-21-2023, 07:25 PM	#3
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: What usually goes wrong with the cruise control? 1987 is likely Cruise III Look in the manuals post for the Cruise III service training textbook. More will be in the service manuals. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

10-21-2023, 10:49 PM	#4
temp190 Junior Member Join Date: Mar 2021 Location: Oronogo, mo Posts: 35	Re: What usually goes wrong with the cruise control? try to check/adjust the switch on the brake pedal. that was my problem.

11-02-2023, 04:04 PM	#7
bennylava Registered User Join Date: Jul 2017 Location: Texas Posts: 408	Re: What usually goes wrong with the cruise control? Well upon inspection... The linkage came off. So I reconnected it to the throttle. It was just laying there. Might have a problem with the cruise if the linkage ain't hooked up. Also made sure it wouldn't come off again.

11-04-2023, 03:25 PM	#8
rick1956 Registered User Join Date: Jan 2009 Location: Edgewood, WA Posts: 108	Re: What usually goes wrong with the cruise control? Damn, how come it's never the easy stuff with me? Good deal __________________ I may be old, but I still enjoy the feeling of the earth rotating beneath my wheels...

11-05-2023, 10:50 AM	#10
TKCR Senior Member Join Date: Oct 2014 Location: Ohio Posts: 6,979	Re: What usually goes wrong with the cruise control? That’s what mine was also. PO must have just disconnected it, but it was there, just not hooked up. __________________ FB Page for my Seats Belts https://www.facebook.com/73-87-Chevy...9439407476735/ Restoring Seatbelts: http://67-72chevytrucks.com/vboard/s...d.php?t=809750 SOLD My 86 Build:http://67-72chevytrucks.com/vboard/s...d.php?t=654972 Past Restored Bench Seats:http://67-72chevytrucks.com/vboard/s...d.php?t=715398 PayPal link to pay for your items: https://www.paypal.me/TKCR

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