Ford Mustang Forums banner

1 - 4 of 4 Posts

·
Registered
Joined
·
13 Posts
Discussion Starter #1
I've got a strange problem with the rpm indication on my slightly modified '93 LX 5.0 convertible that I just bought, and since this is my first post on this forum, I'm looking forward to all the great advice out there.

Here's what it's doing: the rpm needle sits normally at zero rpm with ignition OFF, but with ignition ON and/or engine started, the needle quickly indicates approx. 3200 rpm at idle. As the engine is revved to approx. 1500 actual rpm (by ear), the needle begins to move higher from it's 3200 rpm benchline throughout the range, normally but inaccurately, so 4000 rpm indicated sounds like about 2000 rpm actual. As the rpm decels to idle, the needle dips below 3200, then settles quickly back to 3200 rpm.

Whaddya think? I have decent mechanical knowledge and a decent set of tools to match, with a Chilton's manual and a highly recommended Mustang Performance Handbook to help out, but anyone out there who could throw some detailed info this thread's way would be most welcome!
 
1 - 4 of 4 Posts
Top