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Registered
Join Date: May 2002
Location: Iowa
Posts: 12
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Cuise control help
Well still working out problems with the new 88 cab..
One problem is the cruise control. I have the Bently manual and enough electrical to be safely dangerous. Well all the cruise module has power, relay checks out, brake and clutch switches working. I assume the speed sensor is working 'cause the speedo works. Guess the question is does anybody have a detailed schematic of the cruise control module and speed control servo. Or better yet a trouble shooting flow chart for this year car? How do the used part vendors check cruise module function ( other than plugging into a 911 with known working cruise)? Did I mention this car rocks. I need cruise to keep it to sain speeds as Iowa 2 lane roads tend to bring out the speed freak in me. 
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06-11-2002, 06:13 AM
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Registered
Join Date: Nov 2000
Location: AZ
Posts: 8,414
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If the switches (including column stalk), control module, and relay checks out, You might check the actuator diaphragm (located on the rear engine bulkhead, next to the left rear shock mount), and CC/throttle attachment.
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06-11-2002, 10:38 AM
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Registered
Join Date: May 2000
Location: Arlington, Tx
Posts: 71
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Did it work until lately? Have you had the speedo opened?
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06-11-2002, 12:49 PM
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Registered
Join Date: May 2002
Location: Iowa
Posts: 12
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I did check the steering stalk switch and this checked out.
How do I check the actuator. The linkage to the FI is ok. Just didn't see a vacuum type of hook up, is it a servo (electrical motor) type of actuator. I just bought this car 2 weeks ago. Speedo did have problems with not working intermitantly when car was new less than 10k miles. dealer fixed but I don't know what the repair was. My guess is actuator or cruise module. Thanks for the interest and good questions. Peter |
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06-12-2002, 02:49 PM
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Senior Member
Join Date: Nov 2000
Location: Stuttgart FRG
Posts: 2,307
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Hello
I think in 88 Porsche swaped the vac assistet to a motorized throttle puller. Grüsse |
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06-12-2002, 08:33 PM
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Registered
Join Date: May 2002
Location: Iowa
Posts: 12
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Thank you Grusse
I will try to figure out the wiring harness and see if I can hot wire the actuator. If that works than only thing left would be the cruise module and possibly the speed sensor connection. Peter |
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06-13-2002, 04:09 AM
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Registered
Join Date: May 2002
Location: Massachusetts
Posts: 480
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You might call Peter B. Sanford, (805) 772-5127, peter@gdl-online.com. His company, General Development Laboratories, is awesome at cruise.
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CWL '86 Carrera Coupe '88 Carrera Cab '02 525i Sedan |
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06-13-2002, 06:16 AM
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