Bouncing Tach
Elder User
Joined: Mar 2006
Posts: 901
Likes: 0
From: North-Eastern, Ohio
Start by doing the least costly, least time consuming thing and work your way up.
Start by removing the sender from the IP gear housing and clean the tip with your favorite solvent. Sometimes they get dirty and throw off the readings. Cost-$0 Time- >10 mins.
A new sender is about $50 from the dealer.
Start by removing the sender from the IP gear housing and clean the tip with your favorite solvent. Sometimes they get dirty and throw off the readings. Cost-$0 Time- >10 mins.
A new sender is about $50 from the dealer.
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
A dead tach sender should/would send the automatic trans into a "failure management mode" (limp mode) with harsh engagements and firm shift feel and an abnormal shift schedule. It has no effect on a manual trans only the Tach readings.
Check the wires where they exit the big nut on the oil filler housing , known to short out due to bare wire.....
Replace the tach sender on the oil fill housing a big 1" nut with 2 wires. Ford only part Engine RPM sensor E5TZ-17B384-A about $50. You can remove and clean it but usually changed later too.
You can test it too, hold it in the air away from ferrous metal, using an ohm meter lead on each wire you need DC resistance between 2000-3000 ohms.
Check the wires where they exit the big nut on the oil filler housing , known to short out due to bare wire.....
Replace the tach sender on the oil fill housing a big 1" nut with 2 wires. Ford only part Engine RPM sensor E5TZ-17B384-A about $50. You can remove and clean it but usually changed later too.
You can test it too, hold it in the air away from ferrous metal, using an ohm meter lead on each wire you need DC resistance between 2000-3000 ohms.
Senior User
Joined: Oct 2004
Posts: 153
Likes: 0
From: arizona
was driving last nite and the od lite started flashing when i would decelerate. i started freaking til i realized the tach would drop to zero after it got to 1000 rpm. i could decelerate to a stop and go again, but it never shifted hard because the tach would work after getting above 1000. wiggled the wires coming out of the sensor (looked ok) and wiggled the connector. problem went away (for now)
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Junior User
Joined: Jul 2007
Posts: 52
Likes: 0
Cleaned off the sensor really well with ether and it still won't work, I will try to ring it out with the DC meter to see if i get anything
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