Computer Diagnostics and Tuning Technical discussion on diagnostics and programming of the F-body computers

Question about A-Tap

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Old Aug 14, 2005 | 06:03 PM
  #1  
93transam1234's Avatar
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From: Maryland
Question about A-Tap

I am seeing a max of 5700 rpms but my stock tach is showing 6200. any idea what could be causing this?

3:73 gears (car is programmed for 3:42's tho)
i think that might be why but i am not sure. anything else i should look at
Old Aug 15, 2005 | 09:47 AM
  #2  
Injuneer's Avatar
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From: Hell was full so they sent me to NJ
Re: Question about A-Tap

Stock tach reads higher than actual engine RPM. Common problem. The gears will not affect how the PCM reads the tach (of the Opti pulse signals).
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