Wednesday, November 24, 2010

1991 Cadillac Sedan Deville won't start?

It used to be a hit and miss kind of thing, now it won't start at all. Battery is not an issue. Rumor has it these cars are notorious for this, but nothing tried has worked. Changed relay for security system, ignition switch and everything. (All the cheapest ways to trouble shoot...) Anyone have this before and can suggest how to fix it?1991 Cadillac Sedan Deville won%26039;t start?
Well if it is cranking (trying to start) then check for spark with a timing light, old sparkplug that is grounded, etc,

if there is no spark then check the output from the crank Position Sensor (a GM Problem), check for 12V at the coils, and check that Ignition Relay (swap with a known good) It may be your ECU in which case I would get a replacement at a junkyard

If you have spark then check the fuel pressure, and the fuel pump fuse and relay, if the pressure is fine make sure that the injectors are pulsing a Volt-Ohm Meter will show you if there is power to the injectors. Visually make sure the injectors are not leaking. If the injectors are not getting any voltage then it could be the ECU.

If the car will not crank, check the ignition switch, check that the cables to the starter are good, and see if you have 12 V at the starter. Test the starter motor. If you have an aftermarket alarm check that the alarm system is getting power and functioning correctly1991 Cadillac Sedan Deville won%26039;t start?
Sounds like it jumped time. Check that next, if not that check your fuel pump. Good luck.1991 Cadillac Sedan Deville won%26039;t start?
My Buick did that. What was wrong was the crankshaft postioning sensor. Since then it was fine. My brothers 94 Olds did the same thing. New sensor. No problem.

I don't know for sure what or where one is but I know it costs me $75.00 at the garage. And, to me, it was money well spent. I think it was an early 90 GMC problem.1991 Cadillac Sedan Deville won%26039;t start?
You might have a bad starter/alternator or maybe some of the wires could be lose.1991 Cadillac Sedan Deville won%26039;t start?
I bought a new 91 caddy back in 91 and had the starter solonoid replaced . sometimes car would be fine and the next time it would not do anything .