Red_Dragon_91

i have a 92 rs 305, and my cruise control does not work and i would really liek it, i have no clue were to start to thry and figure out the problems cause i have never really messed with them before, any inout would be good,and yes i have checked all of my fuses

Dmans85

Transducer was problem on mine. Not sure if this is the common culprit however. The vacuum assenbly is located on drivers side close to headlights. mechanical operation, hose integrity, and vacuum check would be a good start

Fast355

iTrader: (2)

The brake pedal switch is a common failure as well.

Al Hasse

Also one on the clutch pedal for the T-5.


A failure there may also affect the HVAC system, it will cause the system to default to defrost only.

Red_Dragon_91

ok iam kinda lost like i said i have never messed wiht this crap before, and i do have a t-5, so how would i go about chekcing all of this stuff? and any clue how much it would cost to replace it, junkyards aint got any maros or birds

Al Hasse

For the pedal switches, you can get up under the dash and see the switches at the top of the pedals. The switches are basically buttons that are released by the linkages of the pedals. Here's mine, looking up from the floorboard, the clutch has one switch on it, the brake has two - one each for the brake light and cruise release (I forget which is which)

Red_Dragon_91

thats kick *** man thanks for the pics ill go check that out, if that doesnt work what else shoudl i try, also is there another way to check the cruise other than driving there car caus ei just got it shipped here from germany and its not registerd and no insurence yet lol

Al Hasse

Use this link from the sticky at the top of this forum, scroll to the last figure (Figure 62: 1992 body wiring) and the cruise is on the bottom right of the schematic. This should give you a starting point for the electrical part...

http://www.autozone.com/az/cds/en_us...rInfoPages.htm

ntomsheck

iTrader: (1)

How would you know the cruise works if you haven't driven it yet lol. You must go above 25 or 30mph (I can't remember) for it to be able to engage first of all.

Red_Dragon_91

lol i shipped it to louisiana from germany, i was dirving it over there since march, and i could not get it to work over there no matter what speed i was going, also where in the dash is the light for the cruie controll?

archemedes

I didn't think they had the light on the third gen cars

Red_Dragon_91

lol well that sucks, anyway to put a light in?

82CrossFire Z28

iTrader: (1)

Red_Dragon_91

Take a look at the photo Al posted. On the braek pedal there are two switches. The left switch is an electrical switch that powers the brake lights (may be seperate circuits for the tail brake lights and the third brake light) and the cruise control disengage switch. On the right is a vacuum swich which also disengages the cruise control. If you look very closely, you can just see the vacuum hose on the top.

If you have a manual tranny you should also have a combination electrical/vacuum switch on the clutch pedal. The electrical contact on the clutch pedal will be wired in series with the switch on the brake pedal to disengage the crusie control if either pedal is depressed. The vacuum switch will be connected in parallel with the vacuum switch on the brake pedal. This is accompolished with the vacuum hose ending on the clutch pedal, going to a TEE connection at the brake pedal. On side of the TEE will go to the vacuum switch on the brake pedal and the other side will disappear into the wiring harness, out to the engine compartment and the vacuum servo.

I have the 82 shop manual which has an on car service check routine. However the transducre was changed in 84 or 85 so the one refered to in this routine will not match yours. I also think some of the wire colors and connections changed when GM changed the transducer design. I can post it but you will have to do a little research on the link Al provided to verify wire colors, etc. Also, I expect the transducer test listed in my service manual will not apply to the transducer on your car due to the different design.

Dave

Red_Dragon_91

ok thanks for the info guys, now i just gotta find time to take a look at it and put m y german plates on and go for a spin, ill let yall knwo how it goes

KITT1983

iTrader: (3)

my car is in park. my dad accidentally put the cruise control on. so i press the cruise control reset button and my cruise control surges to 7000rpm red zone . i shut it off immediately. it never did that before. my idle also went up to 1500- 2000Rpm

82CrossFire Z28

iTrader: (1)

KITT1983

Sorry for not responding sooner, but I have been off the board for a couple of months. The most likely cause of your problem is a failed transducer, which is feeding a full vacuum to the vacuum servo and pulling the throttle linkage to full open.

Are you familiar with the cruise control components, or do you need a few pictures?

If you know where the vacuum servo is, with the engine off, disconnect the vacuum line to it and plug the line. Now start the car and see if the high rpm problem goes away. If so the transducer is bad.

The other clue that the transducer is bad is that the cruise control has a safety feature that disables the cruise when the speed of the car is under 35-40mph. The fact that it appears to be engaging in park highlights this as the likely problem.

KITT1983

iTrader: (3)

No, I am not familar with anything of the cruise control system but I am learning as I go along

do you have any pictures of all the cruise control components and a guide to what their functions are?

When I start my car it idles at 2,000 RPM then goes to 1,000 RPM
after engaging drive the RPM goes down to 600 RPM idle

KITT1983

iTrader: (3)

after looking further into the problem. my cruise control throttle cable has a kink in it. the problem of the RPM surging and high idle on cold start up was still there.

but when I disconnected the power cable to the cruise control. the high idle disappeared.

I think it is the cruise control transducer and I have to replace cruise control throttle cable.

572_Rat

If you have a cruise that does not work at all, what would you change first, would it be the control module?

Raymon

I did a T-5 conversion on my 89 IROC conv. Brake cruise control switch was fine. When I connected it, in parallel, to the clutch switch, neither would work. I got a vacuum 'T' & ran vacuum to both switches, but disconnected the wiring from the clutch switch. Now break switch will disengage the cruise control, but the clutch only prevents the engine from revving. Will it work correctly if I reconnect the wires from the brake switch (in parallel)?

myzticc66

I have a 1987 Iroc Z 305 TPI I am having cruise control issues also. The vacuum lines are good and I replaced the turn signal column. It looks to me like the brake pedal switch is bad. I can see the spring that I'm sure should be inside the plastic tube. I have a attached photo. It has part# 25523376 7079 stamped on it. I'm having a hard time finding the part. Is there any other part that should fit this? Anyways any help would be awesome. Hope I'm posting this in the right spot. Thanks!

podiatra

I would like to know that. It seems that changing the module would be a pain.

myzticc66

I found it at Oreillys. This fits a 87 Iroc automatic. Went in real easy. Just have to make sure both switches are adjusted correctly. both should be touching the metal plate by the brake lever and both should separate from the plate when the brake is pressed.


http://www.oreillyauto.com/site/c/de...yword=25523376

podiatra

Great! i will need to get similar part.

podiatra

Hi guys!
Where is the cruse control module? Is it behind the dash board?
Thanks!

KITT1983

iTrader: (3)

any updates ?

podiatra

I dismounted my servo and seems that it works. Clean it up. Recheck all my hoses for kinks and didn't dind any. Tighten throttle cable. Check my wiring around the steering column and are intact. Clutch and brake switch seem to be working.

The previous owner of my car hacked it electronically. I am suspecting the the cruise control module needs to replaced. At this point the cruise control does nothing whatsoever.

podiatra

Does anybody knows how to best access the cruise control module ? I was able to find the ECM underneath the dash in passenger side. My service manual shows it somewhere to the left of the ECM but I can access that area of the dash...

Jaysz28

iTrader: (30)

Just a random thought, but the cruise control won't work if your third brake light is burned out..... took me a lot of head scratching to figure that one out!

antares57

iTrader: (8)

Great info to know. this is probably my problem. Was working before my brake light went out but I didn't associate the two, thanks.

podiatra

Great, I will need to check, thanks!

podiatra

3rd brake light is working....

KITT1983

iTrader: (3)

any updates ?

Jersey89GTA

iTrader: (1)

I guess I got real lucky. I replaced the turn signal stalk with a new one and my cruise started working again in the GTA. So I dissected the old one to see why ... the stalk has a metal rod inside of it, it was rusty .... new one works great. $15 on ebay.

podiatra

My clutch switch needed adjustment.

Shakenblake

Please elaborate. I have no cruise control at all but I also have no speedometer/odometer and defrost only air. thanks. 1988 305 tpi 700r4, but I'm going to guess that my cruise issue would probably be corrected I'd my Speedo worked. And that the air/vent issue is another problem.

rushtk

Having same issue with my sons 92 Z 350, trying to find any post for an idea.

1badcj8

Does anyone have a picture of the "Transducer" When I Google it I get a butt ton of different things, none of which say anything about the cruise control system. Thanks...