1994 Ford E-Series Van MAF

Tiny
MCAVINEE
  • MEMBER
  • 1994 FORD E-SERIES VAN
  • V8
  • 2WD
  • AUTOMATIC
  • 23,300 MILES
I have a van that has a miss. Starts up fine all the time but when I plug in the MAF Sensor I hear clicking sounds and it runs very rough. When I unlug the sensor the idle smooths out but has no power. WHen I remove the positive cable it resets the computer codes and then it will run fine for about 4o miles then the code must come back. I replavced the sensor. I had a local garage replace the injectors and they replaced them with used ones and the problem it still there. Where do the three wires go to from the sensor plug? This may help me trace them down. Thank you
Do you
have the same problem?
Yes
No
Saturday, May 22nd, 2010 AT 8:14 PM

11 Replies

Tiny
RASMATAZ
  • MEMBER
It goes back to the computer-
Was this
answer
helpful?
Yes
No
Saturday, May 22nd, 2010 AT 9:13 PM
Tiny
MCAVINEE
  • MEMBER
Thank you for your reply. Followup question. If all three wires goes to the computer, then is it probable that I purchased from NAPA a MAF Sensor that is bad too? My sensor is the type that uses a vacuum line and the plug. Nothing goes insite the sir cleaner. I have traced the vacuum line and it is working. When I disconnect the battery cable it resets the computer and I am good to go for another 30 miles or so. The local garage could not isolate the problem. I read on your site how to check the codes using a test lite. They seemed to be a little lacking in knowledge doing the old fashion way of the mechanic. Without the scanner they seemed lost.
Was this
answer
helpful?
Yes
No
Sunday, May 23rd, 2010 AT 5:56 AM
Tiny
RASMATAZ
  • MEMBER
You sure it not the MAP sensor you're dealing with -it uses vacuum
Was this
answer
helpful?
Yes
No
Sunday, May 23rd, 2010 AT 6:05 AM
Tiny
MCAVINEE
  • MEMBER
I just bought a new one from NAPA and it is doing the same thing as the old one. If this plug goes directly to the computer, then the computer is reacting to just this device, it would seem because when I unplug it, the clicking sound ends and the idle revs up and is smooth. I tryed just for curiosoty to put it in gear and try to drive it out my driveway and it was very powerless. Plug it back in after disconnecting the battery cable and the problem goes away for approximately 30 miles. Shoudl I take this back to NAPA and get a replacement
Was this
answer
helpful?
Yes
No
Sunday, May 23rd, 2010 AT 6:23 AM
Tiny
RASMATAZ
  • MEMBER
Try replacing it and see what happens
Was this
answer
helpful?
Yes
No
Sunday, May 23rd, 2010 AT 6:30 AM
Tiny
MCAVINEE
  • MEMBER
Thank you for your prompt reply. It was appreciated.
Was this
answer
helpful?
Yes
No
Sunday, May 23rd, 2010 AT 6:35 AM
Tiny
MCAVINEE
  • MEMBER
Is a MAF Sensor and MAP Sensor two different parts?
Was this
answer
helpful?
Yes
No
Sunday, May 23rd, 2010 AT 7:22 AM
Tiny
RASMATAZ
  • MEMBER
Its two different things one measure airflow and the other vacuum

MAF sensor


http://www.2carpros.com/forum/automotive_pictures/12900_maf_sensor_3.jpg



MAP sensor


http://www.2carpros.com/forum/automotive_pictures/12900_map_sensor_2.jpg

Was this
answer
helpful?
Yes
No
Sunday, May 23rd, 2010 AT 7:31 AM
Tiny
MCAVINEE
  • MEMBER
Oh, where is the MAP Sensor located then? I have been replacing the MAF sensor only that uses a vacuum line. Maybe I am replacing the wrong part
Was this
answer
helpful?
Yes
No
Sunday, May 23rd, 2010 AT 7:34 AM
Tiny
RASMATAZ
  • MEMBER
The MAP sensor is located at right side of firewall near AC/Heater blower motor.
Was this
answer
helpful?
Yes
No
Sunday, May 23rd, 2010 AT 7:39 AM
Tiny
MCAVINEE
  • MEMBER
So it seems like I am purchasing the wrong part. I am a computer tech, but do have some limited mechanical knowledge.

I sholdl probably replace that sensor since I already replaced the sensor sitting on the air clearner assembly the one with the vacuum line running to it.
Was this
answer
helpful?
Yes
No
Sunday, May 23rd, 2010 AT 7:43 AM

Please login or register to post a reply.

Recommended Guides