1985 Mercury Marquis loss of power

Tiny
MACREYNOLDS32
  • MEMBER
  • 1985 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 189,000 MILES
My ignition module went out and was recently replaced. After the replacement of the module the car started to lose power whenever I went up a hill which would cause the lights to flicker as the car struggled up the hill wen getting on flat ground the car worked fine as normal I changed the spark plugs, cap, rotor, and installed new plug wiring but still have the same results going up hill even though the flat ground performance has improved where should I start next
Tuesday, March 23rd, 2010 AT 7:34 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lack of acceleration, chugging, hesitating, bogging etc. Could be caused by one of the following below.

Inspect and test all the following listed below and get back with some results

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard.
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Tuesday, March 23rd, 2010 AT 8:57 PM

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