20 Most Recent 1990 Cadillac Eldorado Questions & Answers

You have interupted the passkey antitheft system. This link may help you. This is very common on GM vehicles. Do It Yourself GM Security bypass

If this is the analog intrument cluster and the entire instrument cluster is intermittently losing illumination, remove the instrument cluster light fuse and replace it with a new fuse. It is remotely possible that the actual fuse holder wires have broken due to age and would need to be soldered back together. If this is the digital instrument cluster and the entire display is going dead, it could be anything from the wiring harness to the BCM. If it is the digital instrument cluster, I can really only recommend taking it to a reputable shop or Cadillac dealer to service.

could be problem pressure regulator --stuck open --and not allowing the pump to build pressure

It's your PATSII security system...Any good mechanic should be able to fix this for $50-100 WITHOUT REPLACING THE BCM (tell them I said so).
Good Luck

What did they say was wrong?

Start by replacing the pickup coil in the distributor, AND replace the distributor cap and rotor.

google it you will find it.

check and clean the map sensor /with only map sensor cleaner and be very careful how you handle this part very sensitive also its wireing plugs..and only use map sensor cleaner..no carburator cleaner or brake cleaner..they are way to strong..and they will defect this part..in other words anything other map sensor cleaner..it will eat up the special coating on the sensor ..because they are very micro small area..youll see and pay close attention when your taking it apart ..because it go's back exactly the same reverse process.

PCM defective

With a frozen radiator the things that most likely will occur--- split radiator cores ---frozen ,split block---cracked head/s--- broken water pump-- split heater core--burst hoses

On the bottom right of the display is a hole marked "date/timeset" You can use an ink pin or some such. First push and the minutes will flas. Second push the hour will flash You can push either the "range" or "temp/time" buttons for scrolling. Third push the date will flash. Fourth push the month. Fifth push the year will flash The sixth push will exit. you will see arrows pointing downward above the "temp time" button upward above the "range" button push eiter to increase or decrease the Disply that is flashing. You an change the flashing disly one increment at a time or hold the button in to change it rapidly.

i would check the dimmer switch make sure it didn't get bumped or turned off

There is a button under the lip in front, press it and should pop open

Hi Vincent,here's a link that may help you.