Question about 1991 Cadillac DeVille

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Cadalliac 1991 Fleetwood 4.9 v8

Cadillac 1991 Fleetwood 4.9 v8
What does code F46 mean?

Car misses around 40 mph' and runs good after you ge over 45 mph.

Has a miss at idle but runs good otherwise.

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Hows the A/c cooling? F46 is a a/c refrigerent problem.. If its at the right level, it could cause the a/c compressor to rapidly turn on and off, causing a surge feeling.

Posted on Apr 29, 2010


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1 Answer

1991 cadillac fleetwood abs light on.

The ABS module may have failed - check for trouble codes (DTCs) with a good OBDI code reader.

Jan 20, 2018 | 1991 Cadillac Fleetwood

1 Answer

Hi, I was just wondering if anyone could tell me where the fuel filter on a 1990 cadillac fleetwood rear wheel drive is. The car has a 4.5L pf1 v8, and i have heard that the fuel filter is somewhere on the...

On the frame directly below the rear passenger door. its bolted to the this from fuel filter of cadillac 1990 fleetwood located?

Nov 09, 2010 | 1991 Cadillac Fleetwood

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Firing order for 1989 cadillac fleetwood

For the 1989 Cadillac Fleetwood:
I do not know if you have the Fleetwood Brougham with the 5.0L V8, or the Fleetwood FWD (Front Wheel Drive) with the 4.5L V8; however I have included both below.

For the Fleetwood Brougham 5.0L V8:
Firing Order:

For the Fleetwood FWD (Front Wheel Drive) 4.5L V8
Firing Order:

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at!

May 19, 2010 | 1989 Cadillac Fleetwood

1 Answer

1991 cadillac deville f11 and f46 what are those codes

F11 = AC high side temp circuit problem. The F46 indicates low refrigerant charge at one time. Try disconnecting the battery and reconnecting it you might be getting garbage, clean the battery connections..and see what happens. If the codes reappear, you can always go to Autozone who will do an diagnosis for free in the hopes that you purchase the parts from them. I hope this helps and good luck. Please vote and leave a message.

Oct 30, 2009 | 1991 Cadillac DeVille

2 Answers

Ac delco says .40 gap, champion says .60 gap why is that?

It doesn't matter what either one of them said. On my car it recommends a .45 gap, I run mine at .32 as it gets a better spark using less energy to jump the gap. On a self inductive ignition system, a good spark is very important. If this were my car, I would drop it down to .35 and the plugs will last longer, and have better performance. There is absolutely no reason you should EVER gap them at .60. This is a low RPM motor, so .40 would be ok, but I would personally put them at .35, and roll with it.

Apr 03, 2009 | Cadillac Fleetwood Cars & Trucks

1 Answer

I have a 1991 fleetwood cadillac with a 4.9 v8 engine in it.I replaced the wires,sparkplugs,fuelfilter and airfilter.But my car still runs slugish.

This sounds like it may be as simple as cleaning the water or gunk out of the gas tank which is what I always do 1st because it's easy and inexpensive.
Fuel Systems always gets contaminated with carbon buildup, gunk, grime, water and/or bottom junk like rust and this will cause the problems your having!
Fill the tank with High Test, Add some dry gas and a good fuel system cleaner or 2 or 3 and this should dissolve all the gunk and clean the injectors!
Read & follow the cans' instructions carefully.
If this cures the problem never let your gas tank get below 1/4 and especially never run it to empty as this is when the gunk and/or water will enter the system!

Mar 08, 2009 | 1991 Cadillac Fleetwood

1 Answer

Car hesitates when i let off the gas pedal

probably need new fuel injectors,or plugs wires, replaced the spark plugs, wires, distributer cap and rotor, run it if still the same, do a compression test if the is good replaced fuel injectors

Jan 30, 2009 | 1991 Cadillac Seville

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