This is topic 92 5.0 Tachometer malfunction! in forum Tech Talk at Northern California Ford Owners  .


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Posted by 5dean0 (Member # 4623) on :
 
Everytime i start my car the needle on my tach shoot's up o 4000 rpm and stay's there. I cleaned the TPS, check for vacum leak, and my last source of problem would be the ignition switch. But before that, anyone here had this similar problem? please i need help! Thanks!!!!
 

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Posted by Blind (Member # 3052) on :
 
if it's just the tach shooting up high and the engine sounds like it's idling normally than the tach has failed and you need a new gauge.

if the engine is really idling that high then you have a very large vacuum leak, check the PCV or the brake booster vacuum lines from the intake manifold.
 

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Posted by Secnd2nun64 (Member # 1431) on :
 
I remember when my 5.0 use to do that! One time it went strait up and then fell over to the other side of the guage. lol

Your going to need to get a new cluster. Can always just disconnect it and run a tach on the dash.
 

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Posted by rollininmy50 (Member # 9067) on :
 
someone told me to replace the temp sensor, my 88 did the same thing, runs fine now.
 

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Posted by 5dean0 (Member # 4623) on :
 
Thanks to all the possible solutions! My Idle is 100% Normal it's just the tach that is malfunction, I will follow all these advise, worst comes to worst I just get a new cluster.

Thanks!

[ November 05, 2010, 11:14 AM: Message edited by: 5dean0 ]
 

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Posted by 5dean0 (Member # 4623) on :
 
rollinmy50 Where is that Temp Sensor located?
 

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Posted by Blind (Member # 3052) on :
 

quote:

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Originally posted by 5dean0:
rollinmy50 Where is that Temp Sensor located?

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