1993 Mustang 2.3 n/a tachometer not working - Ford Mustang Forums
 
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post #1 of 11 (permalink) Old 07-07-2008 Thread Starter
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1993 Mustang 2.3 n/a tachometer not working

I have had my 1993 2.3 n/a for about 3 years now and ever since the day I bought it the tachometer has not worked right. It seems to work accurately past 3000 rpm, but it will never go lower than that, it seems to bottom out at 3000 rpm for some reason. What could be the cause of this? and is there a quick fix for it?
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post #2 of 11 (permalink) Old 07-07-2008
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Hi,

A bad tach is usualy a sign of a bad ICM. There about $150-ish to buy new.
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post #3 of 11 (permalink) Old 12-07-2008
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Hi,

A bad tach is usualy a sign of a bad ICM. There about $150-ish to buy new.
For us new guys...ICM means Idle Control Module? If that is what it is, I looked in both Chilton's and Haynes Index and did not find it listed. Where is it? My tachometer does not work either, and I checked the fuses. Still working on figuring out what color wire goes from the tach. The module that plugs into the coil packs, it has three wires...is the tach wire there? I am guessing the tach wire has to go to the coils, right?
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post #4 of 11 (permalink) Old 12-17-2008
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Does anyone know what ICM stands for?
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post #5 of 11 (permalink) Old 12-18-2008
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Replace the tach (you can replace it with out replacing the entire cluster). I had a similar problem with my tach on my '93. Buy a tach off E-bay. I spent under $20 on a used one.

The Tach is controlled by the DIS Module (mounted on the intake)
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post #6 of 11 (permalink) Old 12-19-2008
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Replace the tach (you can replace it with out replacing the entire cluster). I had a similar problem with my tach on my '93. Buy a tach off E-bay. I spent under $20 on a used one.

The Tach is controlled by the DIS Module (mounted on the intake)
I have seen a lot of clusters on EBAY, but no tachs. That is OK. The clusters are cheap enough. What does DIS stand for? I just hunted through Chilton's Index and could not find it. Thanks
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post #7 of 11 (permalink) Old 12-19-2008
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Sorry. I am wrong. I just found DIS in My Chilton's Manual. It is under Engine Electrical -Ignition System (DIS) Section 2 page 14. Thanks again. I am off to read up on it. I will get that tach fixed!
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post #8 of 11 (permalink) Old 12-19-2008
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Yeah. You guys are the best. Chilton's says, " The DIS (Distributorless Ignition Sysytem) Module...is also the input signal for the vehicle's tachometer." But, the wiring schematic says that the ICM (Ignition Control Module) "...drives tach," and on the schematic it shows the tach wired straight into the ICM. It also branches off into the IDM (Ignition Diagnostics Monitor). I think I will try to replace the DIS and ICM, before I tear into the cluster. I will let you know what happens.
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post #9 of 11 (permalink) Old 12-19-2008
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You can pull off the DIS (located on the intake manifold) and have it tested at o'reilly auto parts or maybe some other place too, before you go buying a new one for $130
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You can pull off the DIS (located on the intake manifold) and have it tested at o'reilly auto parts or maybe some other place too, before you go buying a new one for $130

Good idea. I will do that.
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