My daughters 93 3.3L Century is running like absolute crap! The car will barely reach 35mph, idles like crap and almost stalls if you put more than the weight of your big toe on the accelerator pedal (not kidding). She tried a "tune up" (plugs, wires, coil packs) recently and that did nothing.
I spent a bunch of time today on the car, here is what I did and the results:
- Ignition Module Replaced - No Change
- Mass Air Flow Sensor Inspected / Cleaned - No Change
- Idle Air Control Valve Inspected / Cleaned - No Change
- Fuel Pressure Regulator Replaced - No Change
- Numerous Vacuum Hoses/Connections Replaced - No Change
- Fuel Filter Replaced - No Change
- Numerous Engine Electrical Connectors Inspected / Cleaned - No Change
- Fuel Pump Circuit Voltage Drop (6v) Repaired - No Change
- Fuel Injector Impedance Checked - All 12.1 - 12.5 ohms
- Fuel Pressure Checked - 16psi @ Idle
According to the Haynes manual we have, Fuel Pressure for this engine should be 30-44psi at idle with the regulator vacuum source connected. If that is correct, there is obviously a fuel pressure problem with this car.
Our next step will be a new fuel pump (yippee, I love dropping fuel tanks) which I'm hoping will resolve the pressure problem and the running issues. Still, I have a few questions...
1. Is the fuel pressure spec in the Haynes manual correct (30-44psi @ Idle) for this engine?
2. Any recommendations for other common problem areas that should be checked on this car (it has roughly 57k miles)?
THANKS IN ADVANCE!!!
Dennis