Symptom-To-Test Menu

WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1988 Ford Ranger, 1988 Ford RV Cutaway, 1988 Ford Pickup, 1988 Ford F-Super Duty, and 1988 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.

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