I got one 4 you techies

Distortion 5.0

New Member

Jul 8, 2005

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Aug 27, 2005

#1

• Aug 27, 2005

• #1

I just purchased a 93 lx coupe today. My question reguards the tachometer, it reads irratically, and typically thousands of rpms lower than it's actually pumping. This car is coil pack dual plug. Any one used to this problem?

 

TMX

New Member

May 24, 2005

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Houston

Aug 27, 2005

#2

• Aug 27, 2005

• #2

It seems the ICMs around the world on the '93 are going nuts this year. The tach is controlled by the Ignition Control Module, about $110 at Autozone. When the tach starts going off, it usually means the ICM needs to be replaced, and if the car runs fine it's nearly certianly the ICM.

 

Distortion 5.0

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Jul 8, 2005

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Aug 27, 2005

#3

• Aug 27, 2005

• #3

Car runs great. I'll look into changing that out. This thing was a steal at 150$ It just cracked over it's first 100k.

 

T

TylerDurden

New Member

Mar 30, 2005

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Aug 28, 2005

#4

• Aug 28, 2005

• #4

yup

No $hit....on a newly aquired 2.3 change the module, coils, plugs, wires, fuel filter, air filter, o2 sensor, oil, check the vacume tree for loose or missing hoses and clean the valve in the air/idle control. Now....your 2.3 is well on it's way to 200K.

 

T

TylerDurden

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Mar 30, 2005

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Aug 28, 2005

#5

• Aug 28, 2005

• #5

wait, wait, wait.........

Damn, what was I thinking. Your tach is jumping? That's drastic. You better sell it to me quick...I'll double your money and save you the pain.

lmao

 

Distortion 5.0

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Jul 8, 2005

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Aug 30, 2005

#6

• Aug 30, 2005

• #6

Hey guys, that's not the DIS module is it? I changed the DIS today and it made no difference what so ever. Where is this ICM of which you speak located? Anyone?

 

TMX

New Member

May 24, 2005

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Houston

Aug 30, 2005

#7

• Aug 30, 2005

• #7

The ICM is a rectangle, thin, grey box that faces towards the front of the car next to the intake, has 2 plugs on it, one on top and one on bottom. If the car basically runs fine, maybe hestitation, that is usually the one problem. Also would you have an MSD DIS-4? The MSD box will throw the tach off alot and requires a tach adapter. If not get the codes checked, 223/224 denote bad Ignition Control Module.

 

R

RustBucket

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Jun 8, 2003

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Buford, GA

Aug 30, 2005

#8

• Aug 30, 2005

• #8

Distortion 5.0 said:

Hey guys, that's not the DIS module is it? I changed the DIS today and it made no difference what so ever. Where is this ICM of which you speak located? Anyone?

Click to expand...

The DIS module and what is being referred to as the ICM are the same thing. Grey module with plugs on top and bottom mounted to the front of the lower intake manifold right behind the power steering pump.

 

Stinger

Founding Member

Jul 7, 2001

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Basehor (Kansas City), KS

Aug 30, 2005

#9

• Aug 30, 2005

• #9

If you changed it and it didn't help, your new one is no good...the ignition module is the only thing that effects the tach readout.

 

Distortion 5.0

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Jul 8, 2005

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Aug 30, 2005

#10

• Aug 30, 2005

• #10

Stinger said:

If you changed it and it didn't help, your new one is no good...the ignition module is the only thing that effects the tach readout.

Click to expand...

Thank you stinger, I knew when I saw that you posted my question was answered. It was a j/y part that I traded a hashed lx for.

 

kiddiccarus

The first widely accepted Tranny

20+ Year Stangneter

Dec 24, 2003

1,789

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30 Mins from a Ragged GT

Aug 30, 2005

#11

• Aug 30, 2005

• #11

Nice deal on a LX hatch I am guessing???

 

T

TylerDurden

New Member

Mar 30, 2005

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Aug 31, 2005

#12

• Aug 31, 2005

• #12

yup

stinger is right. bad module. take it back to where you got it and make them una$$ a new one.

 

vristang

15 Year Member

Mar 31, 2005

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Seattle

Aug 31, 2005

#13

• Aug 31, 2005

• #13

I'm not real familiar with the 2.3 yet, but have the gears been changed?

If the wrong speedo drive gear is still in the trans or the wrong one was installed, the plastic gears can get stripped/damaged and cause fluctuations.

Just a thought.

jason

 

TMX

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May 24, 2005

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Houston

Aug 31, 2005

#14

• Aug 31, 2005

• #14

There really isn't gears for the tach readings. The ECU figures out when a coil fires and how often it fires from the output of the ICM which controls the coil firing and selection. It's very easy to find out how many revolutions the engine makes by the coil spark. With the distributor systems, there might have been gears to control it, but in the DIS system when everything is electronically controlled, it all becomes just calculations.

 

vristang

15 Year Member

Mar 31, 2005

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Seattle

Aug 31, 2005

#15

• Aug 31, 2005

• #15

TMX said:

There really isn't gears for the tach readings. The ECU figures out when a coil fires and how often it fires from the output of the ICM which controls the coil firing and selection. It's very easy to find out how many revolutions the engine makes by the coil spark. With the distributor systems, there might have been gears to control it, but in the DIS system when everything is electronically controlled, it all becomes just calculations.

Click to expand...

Oooops! Didn'ty realize it was a DIS. Thanks for not making fun of the new guy.

What year did the 2.3 switch to DIS?

 

TMX

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May 24, 2005

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Houston

Aug 31, 2005

#16

• Aug 31, 2005

• #16

I believe in 1989, but that could be off. Definately sure in 1993 it was DIS, and I believe 1992 was as well.

 

Distortion 5.0

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Jul 8, 2005

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Aug 31, 2005

#17

• Aug 31, 2005

• #17

The distributed 2.3 used a tfi module to adjust timing and I believe it also controlled the tach. Or was it the coil on those models? I know that's where I connected the after market one in the 88 because the stock circut was shorted.

 

Stinger

Founding Member

Jul 7, 2001

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Basehor (Kansas City), KS

Aug 31, 2005

#18

• Aug 31, 2005

• #18

91-93 cars are DIS...also the 90 california models as well.

TFI and DIS ignition module do the same exhaust function...

 

glowstang93

20+ Year Stangneter

Feb 9, 2003

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Illinois

Sep 1, 2005

#19

• Sep 1, 2005

• #19

TMX said:

I believe in 1989, but that could be off. Definately sure in 1993 it was DIS, and I believe 1992 was as well.

Click to expand...

Definitely in 92 and 93. I started with a 92 that I bought new in 91.

 

stackz

Founding Member

Jun 13, 2001

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james island, sc

Sep 1, 2005

#20

• Sep 1, 2005

• #20

couldnt the tach gauge itself being going bad as well?