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HOMESERVICE MANUALSFORD1988AEROSTAR VAN PASSENGER, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMEEC-IV CEC SYSTEMQUICK TESTSYMPTOM-TO-TEST MENU
1988 Ford Aerostar Van Passenger, Automatic

Symptom-To-Test Menu

1988 Ford Aerostar Van Passenger, AutomaticSECTION Symptom-To-Test Menu
DIAGNOSIS BY SYMPTOM TEST

Symptom Circuit Test & Step
Runs Rough, Misses, Stalls, Lacks Power, Rough Idle, Surges, Stalls in Self Test
2.3L MPFI D20  (1)
2.9L MPFI D20  (1)
3.0L MPFI D20  (1)
4.9L MPFI D20  (1)
5.0L MPFI D20  (1)
5.8L MPFI D20  (1)
7.5L MPFI D20  (1)
Stalls When Parking
2.3L MPFI B15  (3)
2.9L MPFI B15  (3)
3.0L MPFI B15  (3)
4.9L MPFI B15  (3)
5.0L MPFI B15  (3)
5.8L MPFI N/A
7.5L MPFI N/A
A/C Compressor Always Runs
2.3L MPFI D7  (19)
2.9L MPFI N/A
3.0L MPFI N/A
4.9L MPFI N/A
5.0L MPFI N/A
5.8L MPFI N/A
7.5L MPFI N/A
Surges With A/C On At Idle
2.3L MPFI D7  (17)
2.9L MPFI N/A
3.0L MPFI N/A
4.9L MPFI N/A
5.0L MPFI N/A
5.8L MPFI N/A
7.5L MPFI N/A
A/C Stays On During WOT
2.3L MPFI D7  (8)
2.9L MPFI D7  (8)
3.0L MPFI D7  (8)
4.9L MPFI N/A
5.0L MPFI N/A
5.8L MPFI N/A
7.5L MPFI N/A
A/C Not Functioning
2.3L MPFI D7  (1)
2.9L MPFI D7  (1)
3.0L MPFI D7  (1)
4.9L MPFI N/A
5.0L MPFI N/A
5.8L MPFI N/A
7.5L MPFI N/A
Low Idle With A/C On
2.3L MPFI B13  (10)
2.9L MPFI B13  (10)
3.0L MPFI B13  (10)
4.9L MPFI B13  (10)
5.0L MPFI B13  (10)
5.8L MPFI B13  (10)
7.5L MPFI B13  (10)
"CHECK ENGINE" Light Always On
2.3L MPFI D11  (1)
2.9L MPFI D11  (1)
3.0L MPFI D11  (1)
4.9L MPFI D11  (1)
5.0L MPFI D11  (1)
5.8L MPFI D11  (1)
7.5L MPFI D11  (1)
"CHECK ENGINE" Light Never On
2.3L MPFI D11  (2)
2.9L MPFI D11  (2)
3.0L MPFI D11  (2)
4.9L MPFI D11  (2)
5.0L MPFI D11  (2)
5.8L MPFI D11  (2)
7.5L MPFI D11  (2)
Stumble After Hot Restart
2.3L MPFI C1  (20)
2.9L MPFI C1  (20)
3.0L MPFI C1  (20)
4.9L MPFI C1  (20)
5.0L MPFI C1  (20)
5.8L MPFI C1  (20)
7.5L MPFI C1  (20)
Fuel Pump Runs With Engine Off
2.3L MPFI C2  (13)
2.9L MPFI N/A
3.0L MPFI N/A
4.9L MPFI N/A
5.0L MPFI N/A
5.8L MPFI N/A
7.5L MPFI N/A
Gasoline Fumes Under Hood
2.3L MPFI N/A
2.9L MPFI N/A
3.0L MPFI N/A
4.9L MPFI N/A
5.0L MPFI N/A
5.8L MPFI N/A
7.5L MPFI D4  (1)
Spark Knock
2.3L MPFI B7  (1)
2.9L MPFI N/A
3.0L MPFI N/A
4.9L MPFI B7  (1)
5.0L MPFI B7  (1)
5.8L MPFI N/A
7.5L MPFI N/A
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.