I have replaced the pick up coils,the main computer,plugs, wires,battery,fuel filter & catalytic converter. Before replacing the computer, the service traction control light came on & won't go away. I also have a consistant diagnostic code that won't stay cleared...qdm1 & qdm4 failure...there are also other codes that show up that a mechanic told me if that were the case, it wouldn't run at all....what else can I do to solve these problems or should I just ignore them unless the car dies completely?
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The first question I have is how many miles on the Lumina? If well over 100,000 Miles I strongly suspect a clogged Catalytic Converter. Before all the routine maintenance was the vehicle running normally? Another condition could be a worn out fuel pump. These are electric pumps in the fuel tank and typically will eventually fail to supply adequate fuel pressure and volume of fuel required for normal running conditions. Have an ASE Certified Technician check the Fuel Pressure and Flow Rate to determine if it is within manufacturers specifications. I had a 1994 Pontiac Transport with 175,000+ Miles and the Fuel Pump failed. I replaced it myself and then the Catalytic Converter clogged up. Both problems caused low power and stumble conditions.
Does the Check Engine Light come on when the Ignition switch is turned on before starting the engine? If not, you obviously have a bad bulb in the Instrument Cluster. This requires carefully removing the Instrument Cluster and partial dis-assembly to replace the bulb(s). I strongly suggest replacing ALL the Bulbs in the instrument cluster because of the age of the vehicle.
Is the 3.1L engine fuel injected or carburated? If FI see a professional.
Here is the firing order for the 1994 Chevrolet Lumina APV Van with a 3.1 Liter engine with a distributor, and the 3.8 liter engine had the coil packs, and let me know if you need any help to understand this diagram, or if you require any further assistance.
if it's popping,check and make sure that your plug wires are in the correct firing order.i had a friend with a lumina which had this same problem and i found that it was a bad fuel injector so you might want to check those out too. hope this info helps you. take care and good luck, manny
I'm assuming you have the distributor out? You will need to, as the shaft has a gear on the bottom end that has a roll pin. Make sure ALL is marked so that you re-assemble it the same way. You also need to mark the rotor position, and the base of the distributor so you can put it back where it was, or you will have to re-align and time everything!
When's the lst time a major tune up was complete? You may just need some maintenance. When I say major I mean the following Spark plugs, wires, air filter, fuel filter, pcv vlave, check the EGR valve and replace if needed, and inspect/replace drivebelt(if needed). I had an EGR clog on mine and it would lose alot of power, sometimes stall. Also check that your fuel injectors are working proply. You should have a nice cone spray of fuel coming out. You will also want to make sure that your spark plugs are correctly gapped. Your local auto supply store should be able to tell you the correct gap.
Hope this helps.