Check Engine Light
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New User
Joined: May 2001
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Check Engine Light
I have a 92 AWD Ext., with the 4.0. When I decelerate, like cresting a hill and coasting down the other side, my check engine light will come on. When I start up another grade, the light goes out again. My MPG has been consistent, about 17-18 and I am not noticing any other evidence of a problem. So Aerostar fans, which sensor is it? I have replaced the throttle position sensor. My van has 116,000 miles on it and I have owned it since new. I wish I could buy a new one!
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Check Engine Light
Do you know what fault code is stored in the memory? The "Check Engine" light could mean anything. Any specific problems with the engine's "behaviour"?
Tom Ucen
1993 Aerostar XL Ext. 3.0L
Munich, Germany
Tom Ucen
1993 Aerostar XL Ext. 3.0L
Munich, Germany
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Check Engine Light
Yes. I am experiencing some pinging when under load. Not a tremendous amount. It is more pronounced when I am towing a trailer with some weight. I had previously, about three years ago, replaced the throttle position sensor.
Postmaster
Joined: Apr 2001
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Check Engine Light
My guess - the mass air sensor. De-acceleration events as you describe may trigger and overly sensitive or dirty sensor. Somewhere on a past posting someone else mentioned this and solved their problem by cleaning the MAS unit with compressed air. It does sit in the air stream from filter to intake and if you had a bad filter enough dirt could foul the sensor. Worth a try at least.
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Check Engine Light
Mass Air Flow sensor has been replaced with a remanufactured unit. The problem still exists, but not as frequently. I haven't cracked open the Hayes manual to figure out how to read the codes, if I can. The only other problem is a slight pinging noise under initial start up or under load. However, I have had problems before with the lower grades of gas; using the mid-grade is helpful. But, I am still getting an occasional "CEL" under deceleration type conditions. Help!
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Check Engine Light
I have a little booklet (bought in the US) from Wells called "Sure you can work on electronic ignition". It explains very nicely how to pull the codes on the "big three". Once you get the codes, post them.
Good luck!
Tom Ucen
1993 Aerostar XL Ext. 3.0L
Munich, Germany
Good luck!
Tom Ucen
1993 Aerostar XL Ext. 3.0L
Munich, Germany
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New User
Joined: Jun 2001
Posts: 5
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From: Indiana
Check Engine Light
I have a Ford Aerostar v6-4.0L with 120,000 that had the
same problem.
I checked the engine computer codes, and it showed
a 124 - Throttle Position Sensor Voltage too high.
Bought a new TPS at autozone for $21.99
installed it, and the problem went away.
I also did install a new O2 sensor since it had never been
replaced.
For info on how to check your engine codes, see:
http://www.merkurgarage.com/c/EECSelfTest.html
http://www.merkurgarage.com/c/eecCodes.html
http://www2.cybernex.net/~eraser/eeciv.html
The Throttle position sensor is located on the throttle
body right at the air inlet. My 1993 4.0l had no adjustment.
Just removed 2 screws, unclipped the connector, and then
installed the new one.
The check engine light no longer comes on when coasting
down a hill.
Hope that this helps !
same problem.
I checked the engine computer codes, and it showed
a 124 - Throttle Position Sensor Voltage too high.
Bought a new TPS at autozone for $21.99
installed it, and the problem went away.
I also did install a new O2 sensor since it had never been
replaced.
For info on how to check your engine codes, see:
http://www.merkurgarage.com/c/EECSelfTest.html
http://www.merkurgarage.com/c/eecCodes.html
http://www2.cybernex.net/~eraser/eeciv.html
The Throttle position sensor is located on the throttle
body right at the air inlet. My 1993 4.0l had no adjustment.
Just removed 2 screws, unclipped the connector, and then
installed the new one.
The check engine light no longer comes on when coasting
down a hill.
Hope that this helps !
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Thread Starter
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Joined: May 2001
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Check Engine Light
I have replaced the mass air flow sensor. I have replaced the throttle position sensor. Each time I disconnected the negative battery terminal to clear the computer. The MAF made little difference; the check engine light would still come on, though not as frequently--the ping under load remained. The TPS has eliminated the pinging, but the check engine light is still coming on under deceleration conditions. I have not been able to determine how to read the codes, which I think will be my salvation. The post from Germany mentioned a manual--where can I find this book?
The van is running very well, but that check engine light is very distracting! Thanks for all of the posts so far.
The van is running very well, but that check engine light is very distracting! Thanks for all of the posts so far.
New User
Joined: Jun 2001
Posts: 5
Likes: 0
From: Indiana
Check Engine Light
The instructions on how to retrieve the codes, and what the
codes are is listed on the internet at:
http://www.merkurgarage.com/c/EECSelfTest.html
http://www.merkurgarage.com/c/eecCodes.html
http://www2.cybernex.net/~eraser/eeciv.html
Or, you can buy a Haynes manual at the local auto parts store.
It has a section on how to attach a multimeter, and read
the needle sweeps to check codes.
- OR -
for about $25, you can get a ford engine computer code reader
at Wal-Mart This will read the codes, and display them on
a small LCD panel. I believe it also includes a paper with a
list of what all of the codes mean.
codes are is listed on the internet at:
http://www.merkurgarage.com/c/EECSelfTest.html
http://www.merkurgarage.com/c/eecCodes.html
http://www2.cybernex.net/~eraser/eeciv.html
Or, you can buy a Haynes manual at the local auto parts store.
It has a section on how to attach a multimeter, and read
the needle sweeps to check codes.
- OR -
for about $25, you can get a ford engine computer code reader
at Wal-Mart This will read the codes, and display them on
a small LCD panel. I believe it also includes a paper with a
list of what all of the codes mean.
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