Last post on Apr 28, 2013 at 12:50 PM
You are in the Cadillac DeVille
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Cadillac DeVille, Sedan
#2413 of 2634 Re: Fuel Pump Access for 1998 Cadillac Deville [realneil]
Dec 08, 2007 (10:47 am)
Fuel pump is inside the gas tank. I think it was about 2000 or so model year when they put an access plate under the spare tire so the pump could be accessed from above. I think yours will have to have the gas tank dropped out to access the pump.
Cadillacs have been know to overheat the wiring to the pump when the pump is failing. If you have to go into this again, make sure the wiring to the pump is checked also. If it is melted, etc, it will need repair.
Also, the filter might be clogged. It is on the frame, under the left passenger door area.
#2414 of 2634 Re: 96 cadi deville northstar v-8 [hsloan68]
Dec 19, 2007 (6:58 pm)
Hey I had this same problem. I had a local locksmith come out and when he pulled the steering wheel off there were some thin like wires that weren't connected, I would advise you to do this! it cost like 90 bucks..
#2416 of 2634 Transmision Problems
Dec 19, 2007 (7:02 pm)
I have a 96' Deville, I had experienced some problems with rough shifting, but not bad at all so I had the car serviced they put a new transmission kit on changed the fluid. When I leave the shop my light is still on and my car will not shift into overdrive. Any ideals?
#2417 of 2634 Re: Fuel Pump Access for 1998 Cadillac Deville [realneil]
Dec 19, 2007 (7:08 pm)
Something to remember on vehicles with the gas pump in the tank also....... you don't ever want to let the gas tank run empty. The pump gets it's lubrication from the gas and if it runs empty you will almost certainly ruin the pump. It may take a few months to quit completely, but it is pretty certain that it will go bad after being run without enough gas. Good Luck!
Dec 19, 2007 (7:38 pm)
My last log was about the trans sensors. Well I got that fixed. But millage is still off. But my main Q tonight is The service light has come back on says Service Emission system??Filters are fine. I have codes P0325 KNOCK SENSOR 1 (BANK1.
P0401- EGR Flow Insufficient detected
We had the knock sensor replaced a bout 2 years ago so I don't look for that to be the prob..... unless that is a re-accuring thing with these cars....Plus now in climate control will not function on AUTO only ECON. .....anddddddddddd sometimes it just shuts off for a few minutes and comes back on(the heat or air).
So with all this what my next best move?? Rebecca....
#2419 of 2634 Re: Transmision Problems [jaymej]
Dec 19, 2007 (9:10 pm)
You said "they put a new transmission kit on changed the fluid".
I am guessing they just pulled the pan, which takes 'some' of the tranny fluid out, and put a new gasket on it and buckled it back up. And this didn't do anything to help your problem.
You've probably got a shift solonid problem. There are three of these. Two of them can be replaced rather easily. The transmission does have to be opened up, but they can be accessed from the bottomof the car. The third one is buried deep within the tranny, and the motor and tranny must be pulled to get to it. This one usually sets a 0741 error code.
You need to have the error codes pulled, and someone interpret them correctly. If it is a code for the 'A' or 'B' shift solonids, you are lucky. If a 741, it is going to cost a lot because of the labor to pull the tranny.
Unfortunately, not shifting into overdrive sounds more like the 'expensive' one.
#2420 of 2634 Re: 96 Deville [rebeccat]
Dec 19, 2007 (9:13 pm)
Regarding only the AC not going to Auto. This many times means the AC system has lost freon pressure. The pressure and/or temperature sensors in the AC system will NOT allow the system to switch on when it has leaked freon out. When the system is in ECON mode, the AC does not run. So, with no freon, the computer automatically shifts it into ECON mode.
Find the leak, fix it, recharge the system.
#2421 of 2634 1992 Cadillac Sedan DeVille d'elagant
Dec 31, 2007 (3:47 pm)
Having a few problems with my caddy. Rough idle, surging at 30 to35 mph then smooths out. Have been told that it might be the electronic throttle positioner. This vehicle only has 96,000 miles on it an is in show room condition. I've changed the plugs,wires,cap,rotor. Also the catyletic convertor changed out,all the filters,except the fuel filter. only run premium fuel in it. It has The 4.9 V-8 engine in it. Some please help me in this matter. I'm stumped and almost ready to take it and have a diagnostic ran. There is no service engine light on or anything telling me if anything is wrong. Can it be the E CM has gone faulty?
#2422 of 2634 Re: 1992 Cadillac Sedan DeVille d'elagant [toneyg]
Jan 02, 2008 (12:27 pm)
Does this car have Throttle Body Fuel Injection?
If so, there are 2 air passages in the bottom of the intake that clog with carbon and cause dirveability problems such as you are having.
These passages can be seen by looking straight down into the throttle body. Use a probe or screwdriver to clean these passages and your problems might go away.
Otherwise, yes, the idle control and/or throttle position control (some cars have both of these) can go bad and cause problems. I'm not sure these type problems would continue until 30/35mph. If these are the problem/s, I think replacement is rather simple, take off the old ones, put on new ones. BUT, getting them re-set so they work well is a real mess, best left to a mechanic who understands them, or has factory service manual to follow the procedures.
There is also MAP sensor could be bad or the Exhaust Gas Recirculation (EGR) valve that could be also clogged or bad.
Finding a mechanic with experience on this age Cadillac might be your best bet to narrow down exactly is your problem. Or, if you was to pursue it yourself, buy the factory service manual, not one of the after market ones.