1997 Cadillac DeVille - Page 7 - Answered Questions & Fixed issues

Either connection is bad to low pressure sensor or pressure sensor is faulty.

the intake manifold needs to be removed

In the fuse panel either under the hood near battery, or driver kick panel.

Did you check the opwners manual?

cooling sensors are located close to the temperature sender unit and will have a 2 wire connection

Check the alternator, with a multimeter, is pushing correct charge after cleaning all connections to battery and alternator. If the alternator is working properly, then your battery may be faulty, get it tested at a battery shop. The shop will test the battery under load to see where it is for crank power.

For the backfiring, there is a chemical additive process for cleaning the intake system of Northstar V-8's. This is suppose to be done at a Dealer and the solvent stays inside the engine 8 hours or more. It is rumored to be written as a service procedure in the Owners Manual. Check your battery. A shorting battery will activate the antitheft system. Try a new fuelpump Relay

I see more than one issue in your story. Its possible the computer lost memory and will need to relearn. But that would not explain the knocking noise. The oil pressure warning might explain the noise if oil pressure really is low. Running without the belt for even 5 min would not cause the problems you describe. I would focus on the low oil pressure warning and the noise first.

Not too difficult. You may want to get a book for the details. The outer pulley comes off the shaft and there is a snap ring for the magnet. You have to shim the replacement to proper fit.

I am assuming you mean you loose power steering when the steering wheel locks up, which would be a normal event if the engine dies. Same goes for the battery light since the alternator would stop charging the battery. Someone will need to figure out if you are loosing fuel or spark when the engine dies, then troubleshoot the problem. It may be difficult to find if the mechanic can not duplicate the problem in the shop.

listen to tenioner and idler pulleys for bearing going/are bad also check all belt driven components for bearing/noise

test igntion lock cylinder for broken wires

REMOVE PANEL, UNHOOK MOTOR AND REMOVE 3 10MM NUTS PULL MOTOR FROM REGULATOR. NOTE TAKE OLD MOTOR WITH YOU TO MATCH REPLACEMENT

CHECK FUEL LEVEL SENOR AND WIRING TO PZM (BCM)

Lean bank 1and bank 2, possible vacuum leak , restricted fuel filter or low fuel pressure.

Coolant flows from engine thru upper hose to radiator and out thru lower hose to water pump.

be looking at the headlight switch..or fuseable link wires..

take the horn fuse out read your manual it will tell you where is located.

take battery cables off for 30 minutes the reconnect see if the system will reset ..or go to auto zone and have them reset your codes free

are your blower fans coming on correctly ,,also you could have a faulty reserve jug