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Where is the ecm located at on an 1988 olds cutlass Supreme SL?

Engine cranks but will not start and run, had verified bad fuel pressure regulator, fuel rail pressure is at 45Lbs, good spark. car started and ran for two minutes after replacing the fuel pressure regulator, now it does not run at all.

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  • Cars & Trucks Master
  • 21,873 Answers

Do you get a check engine light when you turn the key switch on ?
Have you checked the computer for trouble codes ?
The computer should be behind the glove box, or in the engine compartment on the passenger side near the headlight.

Posted on Dec 07, 2012

  • 1 more comment 
  • stangdad644
    stangdad644 Dec 07, 2012

    I can't get it to start right at the moment.

  • stangdad644
    stangdad644 Dec 07, 2012

    I had to replace the battery too, due to age of the battery, codes ended up being cleared in the process

  • stangdad644
    stangdad644 Dec 07, 2012

    Its gonna have to be in the engine compartment. fuse panel is behind the glove box

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Did you try checking or replacing the coolant sensor? I think you should replace it along with the thermostat. Are there any problems like sputtering or any unusual noises or symptoms? Smoke, anything?

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SOURCE: new pump, no fuel pressure at fuel rail??

fuel pump relay

Posted on Oct 04, 2009

matney68
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SOURCE: My 88 olds cutlass supreme FWD will not start. I

If the engine won't start, perform a spark test as described earlier. This will narrow the problem area down considerably. If no spark occurs, check for the presence of normal battery voltage at the battery terminal (BAT) in the distributor cap. The ignition switch must be in the on position for this test. Either a voltmeter or a test light may be used for this test. Connect the test light wire to ground and the probe end at the BAT terminal at the distributor. If the light comes on, you have voltage to the distributor. If the light fails to come on, this indicates an open circuit in the ignition primary wiring leading to the distributor. In this case, you will have to check wiring continuity back to the ignition switch using a test light. If there is battery voltage at the BAT terminal, but no spark at the plugs, then the problem lies within the distributor assembly.
If the trouble has been narrowed down to the units within the distributor, the following tests can help pinpoint the defective component. An ohmmeter with both high and low ranges should be used. These tests are made with the cap assembly removed. and the battery wire disconnected. If a tachometer is connected to the TACH terminal, disconnect it before making these tests.

  1. Connect a ohmmeter between the TACH and BAT terminals in the distributor cap. The primary coil resistance should be less than 1 ohms.
  2. To check the coil secondary resistance, connect an ohmmeter between the rotor button and the BAT terminal. Note the reading. Connect the ohmmeter between the rotor button and the TACH terminal. Note the reading. The resistance in both cases should be between 6,000 and 30,000 ohms. Be sure to test between the rotor button and both the BAT and TACH terminals.
  3. Replace the coil only if the readings in Step 1 and Step 2 are infinite.

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Posted on Nov 13, 2009

  • 5370 Answers

SOURCE: have a 2007 mitsubishi L200

In your case the pressure sensor is faulty and needs to be replaced. 1) Stores pressurized fuel (25 to 180 MPa) that has been delivered from the supply pump and distributes the fuel to each cylinder injector. A rail pressure sensor and a pressure limiter valve are adopted in the rail. 2) The rail pressure sensor (Pc sensor) detects fuel pressure in the rail and sends a signal to the engine ECU, and the pressure limiter controls the excess pressure. This ensures optimum combustion and reduces combustion noise. ---- Rail • The rail is mounted between the supply pump and the injector, and stores the high-pressure fuel. --------- Injector:-------- • This injector replaces the conventional injection nozzle, and achieves optimal injection by effecting control in accordance with signals from the engine ECU. Signals from the engine ECU determine the duration and timing in which current is applied the injector. This in turn, determines the quantity, rate and timing of the fuel that is injected from the injector. ------------ Rail Pressure Sensor (Pc Sensor) 1) The pressure sensor detects the fuel pressure of the rail, and sends a signal to the engine ECU. The sensor is made from a semiconductor that uses the Piezo resistive effect to detect changes in electrical resistance based on the pressure applied to the elemental silicon. In comparison to the old model, this sensor is compatible with high pressure. ---------- There is a service manual for how the fuel rail sensor and fuel system works.Its for mitsubishi L200 4D56.----------- Click this link for referring the service manual:--- http://technoanswers.blogspot.com/2011/06/service-manual-for-mitsubishi-l200-4d56.html ----------- This should help.thanks.Helpmech.

Posted on Jun 22, 2011

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Would codes 33 and 54 cause a 93 oldsmobile cutlass supreme not to start


Code 54 is fuel pump circuit, Low voltage,will cause car not to start. Wiring open circuit/short circuit to ground, fuel pump relay, engine oil pressure warning lamp switch
Code 33 is MAP sensor,voltage high, low vacuum indicated.
Wiring short circuit to positive, hose blocked/leaking, MAP sensor, ECM

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What makes the fuel pump not kick on on a 92 Oldsmobile Cutlass


There is a red wire close to the battery in the front. It's not connected to anything. Apply positive voltage and that will run your pump for testing purposes.

Dec 08, 2015 | Oldsmobile Cars & Trucks

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1991 Olds cutlass supreme 3.1 started fine and drove fine for about 7-10 miles. I shut it off and went back to start it 5 minutes or less later and it turns over like it wants to start but then just stops...


Your problem may be one of the following:
First check or just replace the fuel filter. Usually located under the car in front of the rear axle, drivers side.
Next, the fuel pump may be worn out. Usually they just stop working (running).
Next, check the fuel pressure regulator. Usually located on the front fuel rail, drivers side.
Is the vacuum line attached? Not leaking or rotted?
Also, do you smell a strong fuel odor when it wont start? May be one or more stuck-open injectors, or the coil pack is bad.
Checking these in the order listed will more than likely fix your problem.
The clicking noise indicates the battery can no longer run the starter, which also means the fuel pump wont run either.

Jun 23, 2011 | 1991 Oldsmobile Cutlass Supreme

2 Answers

Cannot locate the ecm for my 88 olds custom cruiser. can you help?


For 1988 Oldsmobile 88 Custom Cruiser 5.0L 4BL OHV 8cyl the Engine Control Computer is located front seating area, passenger side, under dash, mounted behind kick panel.

Hope helps (remembeer to rate this asnwer)

Jan 10, 2011 | 1988 Oldsmobile Cutlass Supreme

1 Answer

My car is hard to start in the mornings, it keeps dying out. already replaced fuel pressure regulator and spark plugs what could it be. this problem only started after i fixed the fuel pressure regulator.


probly shud change distributer cap and plug cables--they wear out--ignition module may hav issue too--test to see if ur gitten fuel pressure the regulator may need testing--buy a haynes manual for maintenance details

Dec 14, 2010 | 1988 Oldsmobile Cutlass Supreme

1 Answer

88 olds cutlass supreme wont restart when hot. starter cranks but still wont start


Replace the ignition module,they are bad to go out,and they do this when they get warm ,to hot,

Aug 12, 2010 | 1988 Oldsmobile Cutlass Supreme

1 Answer

1991 Oldsmobile Cutlass Supreme-there's no spark. changed module, crank sensor, ecm. pls advise...


Check the wire from the module to the crank sensor. They go bad. Usually from oil leaks. Is it saturated with oil where it goes under the engine? Also check for power and ground on the two wire plug on the drivers side of the module. It isn't the ecm or anything with it. The ignition system on the 3.1 will work with the ecm unplugged. The ignition system is a stand alone system. It sends signals to the ecm for the fuel injection.

Jun 18, 2010 | 1991 Oldsmobile Cutlass Supreme

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Choking and stalling while running and then will not start


Might be dirty fuel filter change the fuel filter see how it runs.

Nov 18, 2008 | 1988 Oldsmobile Cutlass Supreme

1 Answer

1991 oldsmobile cutlass supreme


Check for fuses/power/ground to the engine computer (or injector drive computer) whatever the case is.

Spark, fuel pump, and starter all are independant of the fuel injection computer.

Either the computer itself has gone bad, or it is not receiving power or ground, or wiring to the injectors might be bad...

Aug 28, 2008 | 1991 Oldsmobile Cutlass Supreme

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