Persistent Tach / E4OD Problem
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Freshman User
Joined: Oct 2005
Posts: 39
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From: Alaska
Persistent Tach / E4OD Problem
I have a 1994 IDI TD, E4OD, 4x4. I've been having a persistent tach problem - the tach goes dead for an instant or more while driving/idling. This causes the E4OD to go in and out of converter lockup and to downshift - sometimes quite often in/out. I know this is bad.
I have replaced the tach sensor twice - it usually goes away for a few months and then comes back. I have tried to check for corroded wires, removed/checked the inst cluster (seemed OK). I finally took it to the shop in despiration - they replaced the tech sensor again and it stopped for about 4 months now it's back again.
Any ideas?
Bad sensors from Ford?
Bad E4OD computer (tranny was rebuilt 2 yrs ago)?
Is there any way to bypass the tach or trick the CPU so it doesn't do this any more?
Thanks for the help.
I have replaced the tach sensor twice - it usually goes away for a few months and then comes back. I have tried to check for corroded wires, removed/checked the inst cluster (seemed OK). I finally took it to the shop in despiration - they replaced the tech sensor again and it stopped for about 4 months now it's back again.
Any ideas?
Bad sensors from Ford?
Bad E4OD computer (tranny was rebuilt 2 yrs ago)?
Is there any way to bypass the tach or trick the CPU so it doesn't do this any more?
Thanks for the help.
Elder User
Joined: Aug 2007
Posts: 728
Likes: 0
overlay the tach sensor wires to the pcm , i would believe one may be broken in the harness and when disturbed while replacing the tach sensor it makes contact again for a while
overlaying the wires is a quick and easy way to eliminate the most prominent cause
overlaying the wires is a quick and easy way to eliminate the most prominent cause
