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1988 Merc Cougar LS, 5.0L automatic, 120,000mi. After 10 minutes or so, the digital speedometer dipsplay goes out, the fuel needle goes to emptly, no blinkers and the fan motor doesn't work. Each time is starts fine with everything working, then after 10 minutes or so, the problem starts. This recently started after traveling over a bumpy gravel road (ND road construction). Thanks, Sonia Nybo, Beulah, ND.
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Check your fuse. Then test for power at the horn with a voltage meter. If no power there, then check the horn relay. If there is power at the horn but it doesn't blow, then replace the horn itself.
You would need to figure out if you are dealing with a fuel problem or ignition problem to proceed. Checking the fuel pressure and for spark at the plugs when it will not start is a good place to begin. Could be a relay or a long list of other things.
The 1988 merc has an automatic emergency brake release that has a valve on the steering column under the dash, when you put the tranny in gear it sends vacuum to the valve on the brake to release it. It could be the valve on the steering column that is the problem. Good luck!
first start with your timing. if not th problem you need to check for a vacuum leaks. make sure all hose have no leaks and are connected.check wiring harness connection to distributor, coil, or alternator for being damaged or loose. last is to check if you have a good fuel flow to the engine. It could be the fuel pump or just a bad fuel filter
Normally you put a floor jack under the engine front or flywheel with a
2x6 cushion board attached and jack it up an inch or so to releave the
pressure on the motor mount. Then with mechanic tools and wrenchs
remove and replace the motor mount.
i loved the old festivas but iam not sure about the speedo. but i think your sending unit whent bad on you for the gas gauge. but first check and make sure a wire didnt come off the sending unit at the fuel tank
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