Question about 1986 Cadillac DeVille
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Posted on Jan 02, 2017
Most likely you need a new battery but do this first. Remove the battery ground connection and the positive connection. Clean them with soda water(coke is sticky but all sodas will work). Scrape or sand the inside of the cable connectors and the outside of the battery posts till they are shiny. A low battery light usually means it is not fully charged or taking a charge optimally but effective troubleshooting the battery and starting system starts with clean,secure connections and a fully charged battery. If your battery has electrolyte filling caps undo them and check the level. If they need topping off use distilled water only. Charge the battery with a car battery charger. It should read about 13.4 Volts under no load. Check and clean the battery negative cable connection to the block and the positive connection to the starter solenoid. Check for good connections to the charging output from the alternator. Inspect all wires for kinks, cracking, shorts, ect. A good once over will reveal probem wiring. Reinstall the battery and cables. Giv'er a crank and see if that is not stronger. Drive it for an hour or so and crank it again. Any noticable degradation in cranking power means you have a bad battery, alternator, diode pack if applicable, voltage reguator, or any combination of the three. Take your alternator and battery to your auto parts dealer. They will usually test them for free. Aslo, starters can wear after time but this is most likely not your problem based on the symptoms.
Posted on Jul 08, 2009
I don't know if your model was already equipped with the 'limp home' mode but if it is, your computer may need to be reset via a code scanner or the dealer.
Posted on Feb 28, 2010
it may be a bad fuelpump,try sparying starting fluid into throtlebody if it starts then its a fuel problem, you can also check for spark,pull a plug wire insert a screwdriver into connection of wire and place close to a ground then have someone crank engine and see if theres spark,if theres no spark it could be a ignition control module,the best thing to do is pin point the problem by seeing what itt doesnt have,fuel or spark,
Posted on Mar 26, 2010
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