ZR-1 Net Registry Forums - cruise control drops out

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- - cruise control drops out (http://zr1.net/forum/showthread.php?t=34910)

combja

08-21-2023 12:22 AM

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?

GOLDCYLON

08-21-2023 07:43 PM

Re: cruise control drops out

Quote:

Originally Posted by combja (Post 339920)

Do you have a FSM? There is a helpful diagnosis tree to follow.

Young1

08-23-2023 09:15 PM

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.

combja

08-24-2023 12:12 AM

Re: cruise control drops out

What is a FSM?

WARP TEN

08-24-2023 10:17 AM

Re: cruise control drops out

Quote:

Originally Posted by combja (Post 339964)

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

GOLDCYLON

08-24-2023 05:38 PM

Re: cruise control drops out

Quote:

Originally Posted by Young1 (Post 339962)

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 :cheers:

Thomas ZR-1

08-28-2023 05:44 AM

Re: cruise control drops out

Check the vacuum switch down on the brake pedal...often cause leaks in the system.

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