I have noticed that the tach appears to malfunction when the engine gets near 3000 RPMS or above. The tach needle begins jumping all over the place.

The car starts fine...and appears to run fine. About a week ago the check engine light did come on for a short trip home from town...but then was off when I restarted later and hasn't come back on. Not sure if there is any relatin...but there seems to be no other symptoms at this point.

Does a malfunctioning tach like that affect the transmission in any way in this year/model? Would it do any further damage if not fixed right away?
Any thoughts on what this issue could be?

Thanks for the thought and advice,
AJ

 

Just some additional info...I jumped the diagnostic connector and it looks like the blink
code was one long and 2 short. I have a CEL Code list and this is what was listed:

12 EGR - exhaust gas recirculation lift valve

Does this code make any sense or help clarify the tach issue I am having?

Thanks,
AJ

 

Tune up items are ?

Do you have a volt meter for some added tested after confirming the tune up items......outside of tune up items, SOUNDS like ICM or coil and or the connections to them.....and I swear I've seen this post before?