1992 Ford Aerostar Rough idle, no power and engine light wo

Tiny
RODENT042
  • MEMBER
  • 1992 FORD AEROSTAR
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 205,000 MILES
Literally out of nowhere my van developed these symptoms. Engine idles roughly and if I attempt to accelerate it bucks, sputters and backfires. The harder I push the slower it accelerates and the worse it runs.

The "check engine" light dims to almost unnoticeable while idling but actually gets brighter with the engine's rpms.
Friday, July 17th, 2009 AT 11:38 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
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Saturday, July 18th, 2009 AT 12:43 AM

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