Question about 1993 Chevrolet Lumina

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93 lumina runs great then falls on face fuel pressure good new injectors tried ecm no codes

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Could be a clogged catalytic converter if you can only go so fast and it seems to be getting worse. Try driving with the 02 sensors out. It should go faster if clogged

Posted on Nov 13, 2009

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Astra randomly cuts out at lights and engine May be sluggish,randomly code is P0093,FUEL RAIL SENSOR?


This diagnostic trouble code (DTC) is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model.
When the computer sets this code it senses a large fuel leak in the high pressure section of the engine. The ECM in a diesel always monitors and controls the fuel pressure from the fuel injector pump to the injectors as long as the engine is running.
To set a code P0093 the ECM must sense a sudden large drop in fuel pressure within the system. This drop in fuel pressure can be internal, external or caused by a faulty sensor signal to the ECM.
When this happens, the ECM sets the code, goes into fail-safe mode which will suspend the fuel injector pump operation and allow one minute to pull over before it shuts the engine down. It will remain in fail-safe mode until the key is off.
The engine may run again but investigate the problem first. This problem will not correct itself or go away. The engine could shut down at any time or speed.
Unlike gasoline engines with fuel injection pressures of 30 to 50 PSI, diesel engine fuel pressure runs up in the Megapascal range, from 4,500 to 30,000 PSI. It takes very high fuel pressure to force fuel into the high compression cylinder of a diesel.
As you progress in diagnosing the problem be always mindful of the fuel pressure when the engine is running. It is ridiculously high! You have a code P0093 stating there is a large fuel leak in the system. Use caution when sticking your nose under the hood of a running engine with this code, or wrenching on the fuel system.
Symptoms Symptoms of a P0093 diagnostic trouble code may include:
  • Code set and malfunction indicator lamp illumination (check engine light)
  • Engine will enter fail-safe mode and shut down within one minute
  • Possible large loss of power above idle
Causes Potential causes for this DTC include:
  • Fuel injector failure
  • Fuel line common rail leak
  • Fuel pressure sensor malfunction
  • Fuel pump or lift pump failure
  • Fuel heater constantly on
  • Fuel temperature sensor failure
  • Leaks at any point in the high pressure circuit
  • Electrical connector corrosion or seating problems
  • Fuel pressure regulator malfunction
  • Fuel filter plugged dropping the fuel line volume
  • Injector pump leak
  • Fuel control actuator failure
  • Cascade overflow valve malfunction
  • Short in the electrical harness at the injectors or to the ECM
  • Fuel pressure limiting valve
  • ECM failure
Diagnostic Steps & Possible Solutions
  • Start with the engine off and doing a walkaround inspection for obvious fuel leaks between the fuel tank and the engine.
  • Lift the hood and check the oil and level. If the oil level has risen, smell the oil. If it is heavily contaminated by fuel, an injector most likely failed in the open position. Do not start the engine again until the oil and filter is changed.
  • Look under the hood for leaks. Start at the injector pump and follow the fuel lines to the fuel injector rail. Look at the injectors for signs of leaks.
  • Pull the electrical connector off the fuel pressure sensor and look for fuel in the connector. A failed sensor will allow fuel up through the sensor into the connector.
  • Check when you last changed the fuel filter. A plugged fuel filter will drop the volume enough to set the code.
  • Check all electrical connectors on the sensors and wiring harness to the injectors for missing insulation, corrosion or loose connections. If no obvious leaks have been found, go online and look up the TSBs (technical service bulletins) for your year and make vehicle. Diesels have no lack of problems as the TSBs will indicate.
Look for the code and associated repair procedures and probable causes. Chevy and Dodge reads like a book. The TSBs will include recalls on various items as well.
Look at your warranty. Most diesel engines have long warranty periods for various items. Many cover injectors for 7 years or better and 200,000 miles.
The dealer is the next step if no deficiencies are found. Checking the fuel pressure and the operation of the ECM takes special tools for a diagnosis.
Tip: Diesels outlast a normal gasoline powered engine when properly serviced. But they demand service at specific intervals to operate properly. There is no free lunch with these. Do not use any seals or gaskets that are not OEM. The pressures and temperatures call for the use of certain materials resistant to these temperatures and pressures.

Jul 12, 2016 | Opel Astra Cars & Trucks

1 Answer

Where is the fuel injector relay on a 2004 vw gti 2.8 liter 24 valve 6 cylinder?


check the immobilizer as it may be preventing the ECM to allow fuel past the injectors
run the fault codes and it could be the ECM needs resetting using a scan tool

Mar 13, 2016 | Cars & Trucks

1 Answer

Intermittent fuel delivery problem. 93 Chevy Lumina APV 3.1L with throttle body fuel injection.


year/make/model/engine size??? Do a fuel pressure test to see what the pressure is. Low/no pressure= poor spray

Nov 08, 2015 | Cars & Trucks

1 Answer

94 5.7 falles on face boggs down then clesars up a little runs nlike junk. good cap and rotor plugs wires and new fuel pressurs regulator filter what am i missing ?????????????????? HELP


Incorrect timing? Weak spark (coil)? Low fuel pressure (restricted filter, fuel pump)? Incorrect spark plugs ? Low compression? Worn out camshaft (insufficient lift)? Spark advance (ignition module)? ECM?

Dec 28, 2013 | 1995 Pontiac Grand Am

1 Answer

Have 93 Lumina sat for a year now won't start and seems to have no fuel pressure. new battery turns over fine but doesn't seem to want to fire either. Ran great when i parked it. WTH??


older cars need to be run alternators sieze up fuel pump gets gummed up .the gas is probably bad so this will make it have no pressure

Oct 05, 2013 | 1999 Chevrolet Lumina

1 Answer

Hot spark, good fuel pressure, but no injector pule


Be sure to check the injectors for a short. I found #1 injector bad when I disconnected the harness from it and the engine fired up. An ohms check verified the short, should be about 12 ohms, mine was 2 ohms. I also saw a response that indicated that the ECM controlled the injectors on the positive side of the harness. This is in error. The ECM controls the injector by grounding the negative side with a quad driver.

Jul 26, 2012 | 1991 Chevrolet Lumina

1 Answer

1992 Lumina Euro 3.1 MPI, what tells the injectors to shoot gas? Not getting the proper fuel through the injectors and the proper time.


The ecm (electronic control module ) operates the injectors. But their are many inputs that send information to the ecm for it to decide when and for how long to operate the injectors (it opertaes the injectors by actually providing a ground to the circut) .What makes you think its a fuel issue, do you have good fuel pressure...

Aug 24, 2010 | 1992 Chevrolet Lumina

3 Answers

I have a 1992 chevy lumina z34, its not getting fuel to the injectors or the injectors or opening. I have fuel pressure. up to where you check for pressure on the fuel rail. it just died when I was driving...


Have you checked that engine oil level is okay, if so check that oil pressure switch is good. The switch is usually bypassed to start the engine, but it won't run with no oil pressure indicated...hope this helps

Oct 07, 2009 | 1992 Chevrolet Lumina

6 Answers

93 chevy lumina euro won't stay running


if you can check for spark when it wont start and fuel pressure and the service port , would be great information , otherwise pattern failure is ignition module and crank sensor (replace them as a set) , after cools off it will run again.

Dec 31, 2008 | 1993 Chevrolet Lumina

1 Answer

2005 PT Cruiser 2.4


I think it sounds like your CAM sensor has fallen off or is faulty.

The computer controls the ignition timing and the injectors to squirt fuel in to the pistons at the right time. If the computer doesn't sense the cam angle correctly as you accellerate it can't put fuel into the pistons to match the opening and closing of the valves.

If you have a manual you can strip down the top of the engine to see the timing gears on the end of the Cam shaft and see if you can see the cam sensor and if there is anything obviously wrong (i.e. its missing) but you may be as well getting to the dealer to have it checked out and fixed. So the good Fuel pressure will not really effect the engine falling on its face as its a computer timing issue caused by bad sensor information that's causing the bad running.

Jul 02, 2008 | 2005 Chrysler PT Cruiser

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