1992 Cadillac Fleetwood (FWD Deville) Sensor? Fuel pump?

Re: Replacing O2 sensor - Cadillac Forums

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Dec 28, 2009 - 14 posts - ‎3 authors
Hi guys, my wife has a 99 Deville with the 4.6L Northstar engine. ... I used the search function for "oxygen sensors" but I received a ton of ... 1985-1992 Fleetwood, 1993Sixty Special, All FWD Forum Discussion, Replacing O2 ... Re: 1992 Deville O2 sensor location
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Check fuel pump & pressure,may be failing

Have you worked on the car at all, in the last couple
years, or just driven it,that could be a factor also

This can actually be several things but most common is the coolant temp sensor, it tells the computer how much fuel to give the engine depending on temp, if the sensor goes bad then it may be giving engine too much fuel when it's warm, which may be why it starts fine cold cause it needs more fuel to start cold, try holding the gas pedal to the floor when u start it warm, if it does start and run rough for a few seconds it's cause it was flooded due to excessive fuel.. Get scanned for any trouble codes..

I have a 1991 Cadillac Fleetwood 4.9 120000 miles, I have the same problem. replaced plugs,wires,cleaned throttle body, and O2 sensor and have same problem. Taking it to a GM shop on 02/24/10.

does it have three second fuel pump run when you turn key to run position/ in between you should let i rest 5 or so seconds then try it again also some of these cadilacs have oil pressure sending unit wich takes the duty of keeping fuel pressure up is fuel pressure lowering as engine quits eg. rev up some in your few seconds of running while the engine is quit momentum keeps it turning for a short time see if you r pressure maintain thru the wind down

check the fuel filter,and the fuel pump pressure,it sounds like fuel pump.

your blower motor would be located on the front passenger side underneath the dash

did you change the cap and rotor if so check to make sure you didnt cross a spark plug wire when putting new wires on

Normal operation is for the pump to run for a few seconds every time the vehicle is started. After this, the level sensor will determine whether or not the pump should run. Sounds like the sensor is not activating the pump.

check the actual fuel line. Also is it fuel injection or carberator