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E31 Shorted MAP Sensor Signal

MAP = manifold absolute pressure sensor

I don't think that would keep it from starting however.

Bruce

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E31 Shorted MAP Sensor Signal

MAP = manifold absolute pressure sensor

I don't think that would keep it from starting however.

Actually, a MAP sensor can prevent it from starting. I know of a thread (I forget where I saw it) where a mechanic was looking for answers as to why his friends car wouldn't start. When he replaced the MAP sensor--problem solved.

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A bad TPS would throw a code. The MAP is inexpensive and can be changed in a few minutes. Also, there is a possibility that the cable is crimped in the engine cover or some such. I would go after the MAP and, if I found a wiring issue on the way in, I would try it before I took the old one off.

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cranks but no start? check fuel and spark. electric fuel pumps like to die. and its always away from home.

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Connect a fuel pressure gage and turn the key on see if you have fuel pressure. Also have someone turn the key on when you have your ear near the tank and see if you hear the pump cycle on for a few seconds

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Or remove the filler cap, place your ear next to it and have someone turn the key on, but do not crank. You should hear the fuel pump run for 2-3 seconds. If not, rap the relay with the handle of a screwdriver just to be sure it is not stuck open.

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checked fuel pump ,yes i could here it. did replace the fuel cut off valve hose i think thats what that was , but that wasn't it . where is the map sensor ? I thought it was on top of the engine on the backside,two wire plug with a vacum hose.

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replaced the map sensor , checked for spark or fire but have nothing .fuel system seems to be working.

You have NO spark? Check the ignition module under the coils for grounds, the four connectors, etc.. You might need an ignition module if you have no spark. How did you determine you have no spark, check all coils

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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the redneck way screwdriver and sparkplug wire , can you still do it that way ?

Yes you can do it that way, just keep the spark from arching near any electronics.. So you have NO spark in ALL coils, yes or no?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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i really don't know ,i just chkd the #1 WIRE and noticed no spark and then jumped on the computer and started searching forums.. i don't know much about coil packs.

My guess is that you won't find any spark on any of the coils, and its your ignition module. A four-coil distributorless ignition with a waste spark set up provides spark to the plugs.

What is an ignition module?

The electronic control module for the ignition system. On vehicles with electronic ignition systems, points were replaced with an ignition control module and cam lobes were replaced with a trigger device. The trigger device, also referred to as a magnetic pick up or Hall effect sensor sends a signal to open and close the ground circuit to the ignition coil to fire the spark plugs. As it current flows thru the trigger unit, the module turns the current back on. It's an a very accurate method of controlling this procedure. Another advantage of the electronic ignition system is that it is able to produce higher voltages, up to twice the voltage than that of prior conventional ignition systems.

What are the symptoms of a defective ignition module?

If a module is defective, the vehicle is usually completely dead. The engine won't run because there's no trigger voltage to the ignition coil

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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as i have just recvd the car not long ago i'm not sure where everything is ,so if you or someone don't mind I need some info on location of somethings ,what is the thing atop dist. and where is control moule inside dist? also coil?

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Totally disregard my post above, you have a 4.9 in your Deville. I am sorry, I missed that you have a 93.. Great Engine. Pull the distributor cap and look to see what is going on, see if you have a cracked cap or bad rotor. Your distributor has 4 twist hooks on it... Report back what you find and we can go further. Look for carbon tracks and cracks. You have no spark. There is also an ignition module and coil in there. Truthfully however I have never heard of a 4.9 coil going bad, but we must realize that they are getting older and we may begin seeing them go bad. I replaced the coil in my 91 4.9 with an Accel coil with 45,000 volts. Also, check the connector on the side of the cap, to see if it backed out and dropped off...that will kill the car like you turned off the key....

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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ignition module was the culprit.running great 25 mpg,alls well, THANKS TO EVERYONES INPUT!!!!!! :D:D:lol::P

BEST HELP PAGES EVER....

BBF was actually right!

The saddest thing in life is wasted talent

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ignition module was the culprit.running great 25 mpg,alls well, THANKS TO EVERYONES INPUT!!!!!! :D:D:lol::P

BEST HELP PAGES EVER....

Glad you got it fixed, come back when you need help, Mike

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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