Go Back   Ford Mustang Forums > Mustang > 2.3 and SVO Mustang > 2.3L Tech

Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.

You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.

Introductions| Mustang Lounge | 2.3L Talk | 2.3L Tech | Mustang Tech | Tech | Racing | Regional

Closed Thread   Post New Thread
Unread 07-07-2008   #1 (permalink)
stbrd03 is offline Rookie

2.3L Member


Joined: Jul 2008
Posts: 9 Threads: 7
 stbrd03's Country Flag
PA   Pennsylvania
stbrd03 is on a distinguished road
Default 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?
stbrd03 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Sponsored Links
Advertisement
 
Unread 07-07-2008   #2 (permalink)
dreamer1uk is offline Apprentice


Joined: Jan 2008
Posts: 80 Threads: 1
 dreamer1uk's Country Flag
South Chicago Suburbs   Illinois
dreamer1uk is on a distinguished road
Send a message via AIM to dreamer1uk Send a message via Yahoo to dreamer1uk
Default

Hi,

A bad tach is usualy a sign of a bad ICM. There about $150-ish to buy new.
dreamer1uk is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 12-07-2008   #3 (permalink)
omw41 is offline Rookie


Joined: Nov 2008
Posts: 36 Threads: 9
 omw41's Country Flag
Houma   Louisiana
omw41 is on a distinguished road
Default

Quote:
Originally Posted by dreamer1uk View Post
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?
omw41 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 12-17-2008   #4 (permalink)
omw41 is offline Rookie


Joined: Nov 2008
Posts: 36 Threads: 9
 omw41's Country Flag
Houma   Louisiana
omw41 is on a distinguished road
Default

Does anyone know what ICM stands for?
omw41 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 12-18-2008   #5 (permalink)
krk105 is offline Apprentice


Joined: Nov 2007
Posts: 72 Threads: 8
 krk105's Country Flag
Macomb   Illinois
krk105 is on a distinguished road
Default

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)
krk105 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 12-19-2008   #6 (permalink)
omw41 is offline Rookie


Joined: Nov 2008
Posts: 36 Threads: 9
 omw41's Country Flag
Houma   Louisiana
omw41 is on a distinguished road
Default

Quote:
Originally Posted by krk105 View Post
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
omw41 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 12-19-2008   #7 (permalink)
omw41 is offline Rookie


Joined: Nov 2008
Posts: 36 Threads: 9
 omw41's Country Flag
Houma   Louisiana
omw41 is on a distinguished road
Default

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!
omw41 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 12-19-2008   #8 (permalink)
omw41 is offline Rookie


Joined: Nov 2008
Posts: 36 Threads: 9
 omw41's Country Flag
Houma   Louisiana
omw41 is on a distinguished road
Default

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.
omw41 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 12-19-2008   #9 (permalink)
omw41 is offline Rookie


Joined: Nov 2008
Posts: 36 Threads: 9
 omw41's Country Flag
Houma   Louisiana
omw41 is on a distinguished road
Default

You were right. I found a tach.

eBay Motors: 90-93 mustang 4cyl 2.3L FACTORY TACHOMETER OEM STOCK (item 190269832517 end time Dec-26-08 18:08:26 PST)
omw41 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 12-22-2008   #10 (permalink)
krk105 is offline Apprentice


Joined: Nov 2007
Posts: 72 Threads: 8
 krk105's Country Flag
Macomb   Illinois
krk105 is on a distinguished road
Default

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
krk105 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 12-23-2008   #11 (permalink)
omw41 is offline Rookie


Joined: Nov 2008
Posts: 36 Threads: 9
 omw41's Country Flag
Houma   Louisiana
omw41 is on a distinguished road
Default

Quote:
Originally Posted by krk105 View Post
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.
omw41 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Sponsored Links
Advertisement
 
Closed Thread   Post New Thread



Thread Tools



Mustang Photos
Mustang Links    Top Sites    RSS    Link To Us    Add to Favorites    Archive    Terms of Use    Site Rules    Privacy    Contact    Sponsors    Advertise   
AllFordMustangs is not affiliated with or endorsed by Ford Motor Company. ©Copyright 2002-2011 All Auto Enthusiasts Network

Search Engine Friendly URLs by vBSEO 3.5.2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164