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Old 04-19-2009, 10:58 AM   #1
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Default 1994 Ranger 4.0 stalls out.

I have a 1994 Ranger 4.0 5-speed 4x4. The problem I have is the check engine light is on. when I use my code reader to find the problem it gives me a code 57, which could be three different things....

1. Neutral Pressure Switch open circuit failure.
2. circuit failed in neutral position
3. octane adjust service pin installed.

What do these reasons mean? Where do I start looking for problems?

The truck stalls out every once in a while at a stop sign. It hesitates and just dies. It starts right up again but with out a problem. I could really use some help on this one. Thank you.
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Old 04-21-2009, 04:33 PM   #2
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Have you noticed any pattern to these stalls based on weather? Namely warm/hot days?

I have an identical truck and it would stall out at random times, mostly when I was going down the road at speed. Luckily it's a standard and with the transmission still engaged I didn't lose my steering.

Anyway, I had to replaced my fuel pump and EEC relays based on some information I got about them getting old and tripping a "breaker" if you will when they got too hot. Replaced both at the same time and haven't had a stall in over 2 years. Just a thought.
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Old 04-22-2009, 09:20 AM   #3
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How did you get a code 57?Someone correct me if I'm wrong but I thought from 93 up they were strictly 3 digit codes.Thats all that is listed in my repair manual anyway.It sounds to me like your mass air sensor is giving you trouble.Thats the same thing mine did.If that turns out right spend the money for a good one.Places like advance or autozone etc selling "rebuilt" units are not good quality in my opinion.
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Old 04-22-2009, 09:47 AM   #4
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That's correct. You read the code wrong. Please run them again and verify what number was output (and tell us whether it was KOEO, Continuous, or KOER).
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Old 04-24-2009, 10:41 PM   #5
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Default 1994 ford ranger 4.0 stalls

The other code I got was a 522. but the code reader manual only lists 2 digit codes. I dont have a ford repair manual .I was thinking mass air flow sensor or the AIC (air idle control) My dad replaced his AIC on his 1992 2.9 w/auto trans and it fixed it. What is a code 522? I had the key on engine off. I replaced all spark plugs and wires, thermostat,and air filter. It usually only stalls out when you push in the clutch to come to a stop. If you do come to a stop and save it from stalling then it will run fine.. It aslo has plenty of power and so forth. thanks for the help.
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Old 04-25-2009, 09:04 AM   #6
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OK, so you didn't get a 57 and you did get a 522? Need to verify exactly what code you got and when in order to proceed.
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Old 04-25-2009, 12:56 PM   #7
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I got the code with the key on engine off like I said before. I had another person run the test with the key on and they got a code 57 but as it was stated to me that 1994 and newer rangers use a 3 digit code, so lets go with the 522 code. I have narrowed it down to a fuel pressure regulator, mass air flow sensor or air idle control valve. What does this code 522 mean? thanks for the help
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Old 04-25-2009, 01:21 PM   #8
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Code 522 is Manual lever position circuit open/vehicle in gear.You get this code when you leave the transmission in gear.Anytime you run codes you have to have the vehicle either in park if automatic or neutral if manual and have everything turned off,radio,fan etc.
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Old 04-25-2009, 01:21 PM   #9
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522 KOEO means you had the transmission in gear when you ran the test. Should be in Park (auto) or neutral (5 speed) for all testing. Fix that, then run the tests again. If it passes, try KOER tests.
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Old 04-26-2009, 08:10 AM   #10
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what is the code for a faulty mass air flow sensor? I took off the MAF and cleaned it and the check engine ligt went out and the truck quit stalling at stop signs. at least it did for a about 10 miles. then it started doing it again. I am I right in thinking that a new MAF would solve the problem? Or should I do a better job cleaning it?
Again thanks for the help.
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