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Aerostar surging

Tiny
BRTEYES101
  • MEMBER
  • 1994 FORD AEROSTAR
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
'94 Ford Aerostar - what causes the van to continue to surge - over and over and over and.
Thank you very much.
Tuesday, January 25th, 2011 AT 12:50 AM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock 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 it and keep testing
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Tuesday, January 25th, 2011 AT 12:59 AM
Tiny
SCOLL
  • MEMBER
  • 9 POSTS
Its common for the iac( idle air control) motor to go bad. Check for vacuum leaks first. Also look at maf sensor for clean wire in sensor.
Throttle position sensor can cause surge or rolling idle. Tap lightly on side of sensor and listen for change in rpm.
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Tuesday, January 25th, 2011 AT 12:59 AM

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