Cadillac Owners Forum banner

1 - 20 of 22 Posts

·
Registered
Blue 1993 Sedan DeVille, 4.9
Joined
·
202 Posts
Discussion Starter #1
Some of you may remember I had a '91 Deville and it caught on fire. I found a '93 in decent shape but with a few repair issues. Most of the issues are due to the guy I bought it from not doing proper maintenance. He didn't know how to take of a caddy and couldn't afford it.

Right now I'm having issue with a strong gas smell. I suspect the oxygen sensor. Where is it? How do I change it? How difficult is it? I don't have the FSM for this car yet. It's getting terrible gas mileage. Like 10 mpg. That won't work. Killing my cashflow.

The transmission is seems to drag in order to get to third or fourth. When I start it I start in second then put it in drive and it's perfectly fine. Doesn't slip or anything like that. Haven't changed the tranny fluid or filter. The previous owner said he did but I doubt it. I checked the oil after I got it and it was blacker than the tires. It looked fine when I test drove it. He must have topped it off. Engine runs fine. No leaks or anything. Seems to idle fine.

E40--power steering switch. Can't seem to locate it. Funny how this engine looks more crowded in the rear engine compartment than the '91.
I appreciate any responses and help.
 

·
Super Moderator
2010 DTS
Joined
·
87,556 Posts
I think the O2 sensor is on the exhaust pipe ahead of the CAT. Get an O2n sensor socket and remove it like a spark plug.
 

·
Registered
Blue 1993 Sedan DeVille, 4.9
Joined
·
202 Posts
Discussion Starter #3
I'll go to the auto parts store and get one.

Would you suggest I change the transmission fluid? I saw a couple of older threads on here where guys commented that they wouldn't change the fluid if it's been in there awhile. It might make the transmission worse.
 

·
Super Moderator
2010 DTS
Joined
·
87,556 Posts
I don't know how many miles are on it, but I do mine at 100K. I would not hesitate to do it if it is needed.
 

·
Registered
Blue 1993 Sedan DeVille, 4.9
Joined
·
202 Posts
Discussion Starter #5
Car has 168k on it. I'm going to change the oil a second time after changing it last week. It's still black.
 

·
Registered
Blue 1993 Sedan DeVille, 4.9
Joined
·
202 Posts
Discussion Starter #7
NOOO! LOL. The actual oil in the crankcase. I have done one oil change with lucas oil. Been driving a week. Oil is still black. Going to do another oil change to get the rest of that sludge outta there. Transmission fluid is red. Just worried if changing the transmission fluid might create more problems. Saw a thread about checking the fuse related to the a/c clutch. Going to check that. The air doesn't work right now. The previous owner said it just need refrigerant. I don't trust that. This car was waiting on someone with the know how and means to take care of it. He put an expensive dual exhaust pipe system on it but couldn't change the oil and do a tune up, get the idle speed right, etc. Go figure. Going to try to change oxygen sensor today and see if gas mileage improves. It should.
 

·
Registered
Blue 1993 Sedan DeVille, 4.9
Joined
·
202 Posts
Discussion Starter #9
I don't know anything about dual exhaust. What are true duals? I guess they are. I'm taking that nonsense off in two weeks. I don't like that noise. The guy who works on my car said it had an expensive muffler on it because he recognized it. The cat should be fine because I think you have to replace that in order to put the dual exhaust on. Hell I don't know. I just know I don't like it. This car is in pretty good shape but was about to be ruined. LOL.
 

·
Registered
91 sedan deville
Joined
·
341 Posts
Power steering switch is located on the steering gear near the firewall. This will cause your idle to be out of wack and can also cause the car to stall while doing slow maneuvers or parking.
 

·
Registered
Blue 1993 Sedan DeVille, 4.9
Joined
·
202 Posts
Discussion Starter #11
Do you get at the power steering switch through the engine compartment or from underneath the car? I assume it's an easy fix?
 

·
Registered
93 Sedan Deville 4.9L
Joined
·
1,005 Posts
I just replaced my o2 sensor with a wrench alone. It is in the exhaust between the firewall and engine. That may be the reason for your low mileage.
 

·
Registered
91 sedan deville
Joined
·
341 Posts
Oh that power steering switch on your car is underneath the car on the passenger side, by the fuel filter on the rack and pinon. Saw it when i was at the junk yard today.
 

·
Registered
1998 Seville STS / 2013 Chevrolet Impala
Joined
·
1,889 Posts
I don't know anything about dual exhaust. What are true duals? I guess they are. I'm taking that nonsense off in two weeks. I don't like that noise. The guy who works on my car said it had an expensive muffler on it because he recognized it. The cat should be fine because I think you have to replace that in order to put the dual exhaust on. Hell I don't know. I just know I don't like it. This car is in pretty good shape but was about to be ruined. LOL.
true duals means two separate pipes all the way from the exhaust manifold to the tail-pipe.
Assuming you said that there is only one cat and one muffler, I'd guess that they're not, but a pic is nessesary! :D
 

·
Registered
Blue 1993 Sedan DeVille, 4.9
Joined
·
202 Posts
Discussion Starter #16
They are not true duals then. How hard would it be take the muffler system off my '91 and put it on the '93. My '91 has a fairly new cat and a good quiet muffler. LOL
Got the o2 sensor changed. Big difference. Gas mileage has improved. I did another oil change b/c the oil was still black. It's a nice light brown color now. Car actually runs better. Funny thing is the transmission doesn't drag outta first as bad as before. Maybe all it needs is a fluid change as well.
Anyone know how I fix the ac door behind the glove box?
 

·
Registered
1998 Seville STS / 2013 Chevrolet Impala
Joined
·
1,889 Posts
The '91 MAY be 2.25" diameter, which is smaller, but I'm not 100% sure. The '92-'93 exhaust has a little bit of a different bend near the end, but it should swap fairly easy.
 

·
Registered
Blue 1993 Sedan DeVille, 4.9
Joined
·
202 Posts
Discussion Starter #18
Do you think it's something I could do myself? Havnen't really checked to see what all is involved. Was going to go to meineke and get a new muffler system installed.

Anyone know how I fix the blend-air door?
 

·
Registered
Blue 1993 Sedan DeVille, 4.9
Joined
·
202 Posts
Discussion Starter #20
Don't laugh but what is the actuator? Had the a/c worked on today. Looks like the compressor is going bad. Going to get someone to take the old one from my '91 and put it on. Seems like the transmission is not longer a problem. I think one of those fuses on the passenger side may have fixed it.
 
1 - 20 of 22 Posts
Top