Question about 1991 Cadillac DeVille

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My 1990 deville has been overloading with gas

I replaced the fuel pump and filter,ever since it has been fouling out plugs,missing and drinking gas

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Replace fuel injectors. it is possible that fuel pressure regulator is bad

Posted on May 19, 2009

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I have a 1990 mitsubishi might max it wont run smooth unless you keep your foot on the gas and keep the rpms up a little bit and it wont drive cause it stalls everytime you try to move it. ive replaced the...


You've already eliminated the spark plug & wireset, distributor cap & rotor.
Sounds like your car needs a tune-up, specifically, the PCV (positive crankcase ventilation) valve, and/of the EGR (Exhaust Gas Recirculation) valve.

Components checked/replaced during a tune-up are:
air filter
motor oil
motor oil filter
breather filter
fuel filter(s)
fuel strainer
PCV valve
EGR valve
spark plugs
spark plug wires
ECM or distributor cap & rotor
cabin air filter
transmission oil filter
transmission oil
engine coolant
check all vacuum hoses and lines

Troubleshooting the no-start condition - from the 1990 Mitsu Mighty Max Repair Manual:

Priority Action Part Type -- Cause
1 Inspect Battery -- Battery Discharged or Faulty.
2 Inspect Battery Cable -- Corroded, Broken, Shorted or Poorly Connected Battery Cable.
3 Inspect Distributor Cap -- Distributor Cap Cracked or Burned.
3 Inspect Fuel Filter -- Clogged or Dirty Fuel Filter.
5 Inspect Ignition Coil -- Faulty Ignition Coil.
6 Inspect Wireset -- Worn, Damaged or Faulty Spark Plug Wire(s).
7 Inspect Spark Plug -- Incorrectly Gapped or Fouled Spark Plug(s).
8 Inspect Starter -- Starter Motor Faulty.
9 Inspect Fuel Pump -- Low Fuel Pressure.
10 Inspect Solenoid Switch -- Faulty Starter Solenoid Switch.
11 Inspect Fuel Pump Relay -- Faulty Fuel Pump Relay.
12 Inspect Fuel Injector Pressure Regulator -- Faulty Fuel Injector Pressure Regulator.
13 Inspect Ignition Switch -- Improperly Connected or Faulty Ignition Switch.
14 Inspect Starter Drive -- Faulty Starter Drive.
15 Inspect Fuel Injector -- Dirty or Worn Fuel Injectors.
16 Inspect Fuel Pump Strainer -- Clogged or Dirty Fuel Pump Strainerat.
17 Inspect Engine Control Computer -- Incorrect Operating Information Being Delivered and Sent From The EEC.
18 Inspect Fuel Tank -- Fuel Tank Empty.
19 Inspect Carburetor -- Carburetor Flooded or Faulty Choke.
20 Inspect Distributor -- Worn, Loose, or Incorrectly Installed Distributor.

Aug 17, 2011 | 1993 Mitsubishi Mighty Max

1 Answer

My 1990 F-150 4.9 6cld has 191000 miles, new fuel pump, new plugs, new coil, drained and cleanded gas tank. When in idle below 1000 rpm doesnt miss any. try incresse rpm acts and sounds like all 6 cyl r...


check the connection of all of the spark plug wires to the plugs, you may have put a wrong one on, when cleaning the gas tank as well it can dislodge a lot of dirt, cleaning injectors and a new fuel filter could solve the issue as well

Mar 01, 2011 | 1990 Ford F150

1 Answer

1991 cadillac sedan deville has excess pressure in gas tank and stalls making right hand turns as soon as fuel gauge shows 9 gals.


SOUND LIKE FUEL PUMP GOING BAD.BUT CHECK THE EVAP CHARCOAL CANISTER FILTER IF GAS SOAKED REPLACE IT REPLACE GAS CAP MAKE SURE GAS CAP IS THE PRESSURE VACUUM TYPE.ALSO CHECK VACUUM PURGE VALVE VACUUM HOSE TO CARBURETOR AND CHECK VACUUM HOSE TO CHARCOAL CANISTER FOR BLOCKAGE RESTRICTION OR BROKEN AND MISSING.

Oct 31, 2010 | 1991 Cadillac DeVille

2 Answers

1990 deville, replaced ecm, fuel pump, filters,


wow...BIG problem...I'd say you have a bad ECM - maybe you hooked it up "hot"? otherwise, check all grounds for secure connections.
Good Luck

Jun 14, 2009 | 1991 Cadillac DeVille

1 Answer

1999 cadillac deville hard starting after its drove


TPS throttle position sensor needs cleaning or replacment. or if you run the tank low on fuel you might be needing to replace fuel pump and filter.

May 15, 2009 | 1999 Cadillac DeVille

1 Answer

My car turns but wont start has gas 1990 cadi deville


maybe ur fuel pump needs replacing. if fuel pump goes out no gas to egnition. or your fuel pump relay might have blown chech owners manual or relays.

May 05, 2009 | 1990 Cadillac Deville

3 Answers

My 97 deville sputters when you press on the gas


Start by putting Lucas fuel stabilizer ,this will remove water in the tank and stabilize bad gas. It also cleans injectors some what. If this doesn't work move on to your fuel pressure regulator and make sure u have good injectors. Also replace fuel filter, easy to do with the purchase of a five dollar tool at any parts store.

Jan 17, 2009 | 1997 Cadillac DeVille

1 Answer

1996 cadillac deville want start


If you had a strong stream of gas shooting out then you may have an fuel injector problem. Possibly a clogged injector or bad injector.If the stream of gas was weak replace fuel filter first and test again.If problem persists check pump fuse then replace pump. sorry for miss reading your post.

Aug 25, 2008 | 1996 Cadillac DeVille

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