my tach issue has returned

[92bronco_in_progress]

my tach issue has returned, the truck idles fine but the tach reads 2500 RPM's, and if i rev the engine the needle moves like it would normally, anyways, i was under the assumption that the tach got its signal off of the module on the side of the distributor, however that module is non-exsistant, the distributor itself is just plugged into the harness, so i have 2 questions:

question 1: am i looking in the right spot as to where the tach gets its signal?

question 2: what do i have to do to fix this problem?

i have no check engine light or anything like that, and no codes have popped up so im a little lost, my chiltons (i know i know get ford service manuals) doesn't say where it gets its signal, it just tells me how to remove the tach out of the cluster

any help is much appreciated

 

[Seabronc]

Here are the diagrams for your truck.

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[92bronco_in_progress]

thanks seabronc

 

[beach8]

did you check to see if the tach (many do) have a switch of some sort to set if the eng is 4-6- or 8 cyl. this may cause the incorrect readings, a 4 cyl will red 2x the rpm of an 8 cyl

hope this helps

Aaron

 

[92bronco_in_progress]

sometimes it works perfect and sometimes its all messed up

 

[BroncoJoe19]

Check your grounds.

G201 and G100

http://broncozone.com/forums/index.php?act...ost&id=8042

G100 is left side of upper radiator support.

G101 is Right side upper radiator support.

 

[Seabronc]

Check your grounds.G201 and G100

http://broncozone.com/forums/index.php?act...ost&id=8042

G100 is left side of upper radiator support.

G101 is Right side upper radiator support.

It does have the flavor of a grounding problem. Also check the grounding connections at engine block, frame, and intake manifold to fire wall.

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