92 tach

ocejo · May 27th, 2011, 01:07 AM

now that I've got my car back on the road, I will be checking the smaller issues. For now I need to figure why the tachometer reads rpms incorrectly. I just it smogged today and noticed that it is not close at all to where they really are. is there a tach wire to the coils like the single coil cars?

zonker · May 28th, 2011, 01:07 AM

the tach gets its signal from the DIS module at terminal #12 (tan w/ yellow stripe). That wire is connected to the EEC, the tach, the DIS module, and the tach service connector behind the drivers side strut tower.

ocejo · May 28th, 2011, 07:30 PM

so how would I repair a faulty tach? replace cluster?

Mikel89us · May 29th, 2011, 06:11 AM

He cant tell you what is wrong. You need to test the circuit and see if you find a problem.

zonker · May 29th, 2011, 10:50 PM

it's always nice to have a spare set of parts floating around to confirm or deny the fault, so you can swap one part with another to see if problems go away or persist...

i know in times of hair pulling on electrical conditions I like to remove a working part from one of my mustangs and try it out on another.

i just did exactly that with my '92, when I had a no-start condition. I suspected the starter relay because it was old, unlike the starter i just installed, and if i bypassed the ignition switch/ neutral switch wiring by arcing the relay terminals, it would do the same thing.

so i tried the working relay on my '91 and i still had a no start. further, i installed the 92's relay on the '91 and the '91 was starting fine.

the problem - a loose crimp on the butt connector connecting the new starter's solenoid wirirng and the car's harness. I crimped the shit out of the butt connector and all is good.

the moral of the story: skill is good but parts are better (unless you have to pay for the privilege).

and on that note - pick your parts in Chula Vista is having a half price sale today and tomorrow, or I can sell you a working unit I have from a previous cluster swap.

ocejo · May 30th, 2011, 10:27 AM

ok I'll see if I can try a spare cluster if not you're looking at a future sale..

May 28th, 2011, 01:07 AM	#2
zonker Enthusiast 1991 Mustang LX 2.3 Join Date: Sep 2010 Location: Temecula, CA Posts: 660 iTrader: 0 reviews	the tach gets its signal from the DIS module at terminal #12 (tan w/ yellow stripe). That wire is connected to the EEC, the tach, the DIS module, and the tach service connector behind the drivers side strut tower. __________________ Rob 1987 Mustang 2.3 LX Convert (T5) project 2.5 N/A HP 1991 Mustang 2.3 LX Convert (A4LD) 1992 Mustang 2.3 LX Convert (A4LD) 41.52 mpg!! 1994 Capri XR2 1.6 Turbo Convert 1999 ZX2 S/R 2.0 Coupe http://zxtuner.com

May 29th, 2011, 06:11 AM	#4
Mikel89us Regular 1991 Mustang 2.3L 11:42 @ 61 in the 1/8th Join Date: Feb 2011 Location: Logansport, IN Posts: 362 iTrader: 0 reviews	He cant tell you what is wrong. You need to test the circuit and see if you find a problem. __________________ 1991 Mustang LX 2.3L 5 Speed convert 1989 Ranger 4X4 2.3L 5 Speed Entire turbo kit waiting to be used again.

May 29th, 2011, 10:50 PM	#5
zonker Enthusiast 1991 Mustang LX 2.3 Join Date: Sep 2010 Location: Temecula, CA Posts: 660 iTrader: 0 reviews	it's always nice to have a spare set of parts floating around to confirm or deny the fault, so you can swap one part with another to see if problems go away or persist... i know in times of hair pulling on electrical conditions I like to remove a working part from one of my mustangs and try it out on another. i just did exactly that with my '92, when I had a no-start condition. I suspected the starter relay because it was old, unlike the starter i just installed, and if i bypassed the ignition switch/ neutral switch wiring by arcing the relay terminals, it would do the same thing. so i tried the working relay on my '91 and i still had a no start. further, i installed the 92's relay on the '91 and the '91 was starting fine. the problem - a loose crimp on the butt connector connecting the new starter's solenoid wirirng and the car's harness. I crimped the shit out of the butt connector and all is good. the moral of the story: skill is good but parts are better (unless you have to pay for the privilege). and on that note - pick your parts in Chula Vista is having a half price sale today and tomorrow, or I can sell you a working unit I have from a previous cluster swap. __________________ Rob 1987 Mustang 2.3 LX Convert (T5) project 2.5 N/A HP 1991 Mustang 2.3 LX Convert (A4LD) 1992 Mustang 2.3 LX Convert (A4LD) 41.52 mpg!! 1994 Capri XR2 1.6 Turbo Convert 1999 ZX2 S/R 2.0 Coupe http://zxtuner.com

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May 27th, 2011, 01:07 AM	#1
ocejo Regular 92 LX 2.3N/A Join Date: May 2010 Location: socal Posts: 215 iTrader: 0 reviews	92 tach now that I've got my car back on the road, I will be checking the smaller issues. For now I need to figure why the tachometer reads rpms incorrectly. I just it smogged today and noticed that it is not close at all to where they really are. is there a tach wire to the coils like the single coil cars?

May 28th, 2011, 07:30 PM	#3
ocejo Regular 92 LX 2.3N/A Join Date: May 2010 Location: socal Posts: 215 iTrader: 0 reviews	so how would I repair a faulty tach? replace cluster?

May 30th, 2011, 10:27 AM	#6
ocejo Regular 92 LX 2.3N/A Join Date: May 2010 Location: socal Posts: 215 iTrader: 0 reviews	ok I'll see if I can try a spare cluster if not you're looking at a future sale..

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