1985 Cadillac Fleetwood Power Loss

1985 ALL OTHER MAKES ALL OTHER MODELS
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JSP2002
  • MEMBER
  • 1 POST
85 Cadi. Fleetwood, Brougham. Got it for free and have had problems with it. To date I have replaced fuel pump, filter, plugs, map sensor, air tube to cat converter, and misc vacuum hoses. When key is turned to on position the gas pedal will pump. If I do not start it quickly the sevice now light apears and the car seems to run rough. When I start it before the service now light apears seems to run better, however service soon light apears. The vehicle is also experiencing lack of power when driving. The engine sounds like it is lugging as if I am towing 10,000 lbs. When in park engine seems to run and accererlate fine.
Thanks for any help.
May 3, 2006 at 8:11 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
It sounds like you have a bad Throttle position sensor causing the idle module to pulsate. An older caddy problem.
May 3, 2006 at 10:26 AM
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Suggested Repair

Test and replace the throttle position sensor if faulty. A bad TPS can make the idle module pulsate and cause rough running and lack of power under load.

Conversation Summary

The owner of a 1985 Cadillac Fleetwood Brougham had already replaced the fuel pump, filter, plugs, MAP sensor, catalytic converter air tube, and several vacuum hoses. The gas pedal pumps with the key on, Service Now or Service Soon lights appear, and the engine runs rough if not started quickly. It also lacks power and sounds like it is lugging while driving, though it accelerates fine in park. The expert attributed this to a bad throttle position sensor causing the idle module to pulsate, a known older Cadillac issue.

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