cruise control servo successful repair - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-23-2006, 12:28 AM   #1
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Default cruise control servo successful repair

I have a basic '94 Bonne that was a program car. About two years ago it started giving trouble with the cruise. It would fade and loose 5 or more mph. Sometimes it would just shut off. Sometimes it would turn off and turn back on while I was bring the car back up to speed. It finally got to the point where it just wasn't worth using. New ones were too expensive when I first looked two years ago. Well, with nothing to loose, I tore into it. I took resistance readings on the three coils. They showed good continuity. At first it looked like the connections inside were pitted and possibly bad. (After you take the outer cover off and remove three more screws, the white plastic piece slides off of the long connector pins. The connections are between the metal tabs on white plastic piece and the tops of the coils.) I cleaned these by wiping them with lint free linen cloth. They were slightly pitted with very small amounts of carbon. Though now clean, this didn't help. Next I made the afore mentioned connections tighter by filling about 10 thousandths off the plastic standoffs/holes for the three screws that hold the white plastic piece to the top of the coils. This didn't help either.
I went for broke. I tore it down as though I was rebuilding a carb. I carefully disassembled the servo till it would not come apart any further. It was DIRTY! That'* all my problem was! It was just dirty AND needed another foam filter. The foam filter crumbled when I touched it. I cleaned and reassembled with a good quality silicone. (Iím a firm believer in good quality silicone on door seals so I also shot some in the vacuum bellows.) I used a lawn mower foam air filter and a razor blade to make another O-Ring type filter to replace the crumbled one. Once reassembled it now works every bit as good as it ever worked. Ití* been working for almost three months now.
However, I would not advise anyone doing this unless they are the type who would rebuild a carb. Carefully disassemble while maintaining orientation and groupings of parts. Youíll see why during the process. Work in an area where you can find any small part that might fall. Clean and lubricate with good quality silicone. Maintain orientation and reassemble in the reverse order that things came apart. Iím not trying to scare you. I just want you to be careful and meticulous. It WILL pay off.
This is my first posting and the whole reason I joined. I hope it helps.
Jerry
Emporia, Ks.
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Old 10-23-2006, 01:00 AM   #2
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Very good info to know, thanks.

Iv been having the same problem with mine, and now it stoped working 100% of the time :(

i think i may open up the spare one i have and take a look at it.
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Old 10-23-2006, 02:33 AM   #3
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Welcome to our group Jerry. That'* some good information that you just shared. Thanks for joining up so you could provide it. If you ever happen to tear one down again - pictures would be great!
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Old 10-23-2006, 08:17 AM   #4
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Jerry...

I don't supposed you have pictures and further instruction you'd like to share? Maybe a write up?
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Old 03-11-2007, 10:06 PM   #5
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Wow - that is great info - I am glad I did a search, because mine is doing the exact same thing. I am going to have to give it a good cleaning.
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Old 03-17-2007, 11:54 PM   #6
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I took the cruise control unit apart and cleaned it. I put it back on and it did not work at all.

So I removed it again and took it apart - I had one of the spools in upside down. I put it back together properly and it works fine now.
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Old 03-18-2007, 01:37 PM   #7
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Please don't dig up old topics.

Feel free to search to find the fixes to your problems. If you need further clarification of a thread that'* more than a month old, start a new thread posing the question, with a link back to the old one.

Thanks!
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