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Dave Nova
Dave Nova, Buick Technician
Category: Buick
Satisfied Customers: 1808
Experience:  ASE Master Certification. GM World Class Certification
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Buick: I have a 2000 buick lesabre with the 3.8 L V6. I get

Customer Question

I have a 2000 buick lesabre with the 3.8 L V6. I get a #306 trouble code, #6 cylinder misfire. I have replaced the spark plugs with AC 41-101 @ .060" gap, plug wires, all three coil packs, I have verified that I do have spark to all cylinders. Compression is @ 185 lbs. I pulled the fuel rail and ohmed out all injectors, all are between the 11.4 and 12.6 ohms. I pressurized the rack on the bench and ticked 12 volts to each one and all spray when ticked. I bought a noid kit and all injector wires show a flashing light. new air filter. When I pull #6 injector wire off the motor RPM doesn't change, any other injector wire when pulled makes another cylinder misfire. I have a new fuel pump and filter but have not installed them yet, thinking that I could have low fuel pressure? I just bought the car with 180000 miles. EGR valve? tps sensor? mass air flow sensor? Idle air contol valve? Intake manifold leak? I sprayed carb cleaner all around the intake manifold while running and didn't make any differance, looking for an intake leak. When pulling fuel injector wires it seams like some, when pulled, affect engine RPM more than others, please help.
Submitted: 2 years ago.
Category: Buick
Expert:  mike kelly replied 2 years ago.
Hello, welcome. My name is***** will do my very best to assist you with your question. I apologize if you have been waiting long for a response.
Do you have a way to test the fuel pressure and let me know what you have?