| EFI speed sensor repair [message #337182] |
Sat, 22 September 2018 12:34  |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma:
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Senior Member |
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The vehicle speed shown on my EFI EBL Whats Up Display (WUD) was jumping up by 50 to 100% or more. My engine would also randomly stumble.
I disabled deceleration fuel cut-off (DFCO) because I thought maybe the EBL was thinking I was decelerating, but now I think it was tripping the Over-Speed limiting.
A new sensor was $140 (US), so I thought I would take it apart and see if it was repairable. It consists of a magnet and a reed switch which by my testing was switching erratically. I ordered a new reed switch from Digikey for 72 cents (CDN). Using my drill to spin the magnet, it now switches with a clean square wave.
$139.00 saved!
http://www.gmcmhphotos.com/photos/speed-sensor-repair/p65253-speed-sensor-repair.html
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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