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Old 09-13-2011, 05:56 AM   #1
djadragon
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Bouncing RPM

I have this issue started couple months ago and now it got worse and worse.

Here's the video below so you get the idea:


This issue happens when normal cruising on the highway and in the city. However, pressed a little more gas, the RPM stay NORMAL and same goes when I let go the gas as well.


I've replaced or checked the following:
-Spark plugs
-Spark plug wires
-Ignition Coil
-Swapped whole Distributor included ICM
-I went to Autozone and Advanced Auto Part to have them test my alternator. Both came out Ďpassedí.
-Replaced battery last month

That's all I can think of.

So, does anyone have a clue related this issue????
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Old 09-13-2011, 12:48 PM   #2
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Looks like an electrical issue with the cluster. Obviously, it is not a problem with anything under the hood because it would be impossible for the motor to change rpm that quickly.
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Old 09-13-2011, 01:57 PM   #3
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Ignore this.

Last edited by catacon; 09-13-2011 at 02:56 PM.
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Old 09-13-2011, 02:54 PM   #4
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i vote for ignition control module or bad gauge cluster. the tachometer gets its signal from the icm. check to make sure the electrical connector(s) is "clicked in" on icm and cluster.
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Old 09-13-2011, 05:59 PM   #5
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i vote for ignition control module or bad gauge cluster. the tachometer gets its signal from the icm. check to make sure the electrical connector(s) is "clicked in" on icm and cluster.

Hmmgh, on a third gen Prelude the tach signal comes from the negative side of the coil. That's how my H22a is running in my 3rd gen. Are you sure it comes from the ICM on a 5th gen?
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Old 09-14-2011, 04:37 AM   #6
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From my understanding, I had swapped the whole Distributor which included ICM as well. It does the same issue. However, I donít believe there is any issue related cluster. That being said, there were slightly jerks when cursing normal highway speed. I have a feeling I might have a bad TPS???
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Old 09-14-2011, 01:45 PM   #7
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crazy enough a bad ground could cause this... i had this in one of my 4th gens and it was a loose ground by the thermostat from when i did my swap... wouldn't hurt to double check the grounds in the bay
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Old 09-14-2011, 06:50 PM   #8
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Quote:
Originally Posted by cinci-91-H View Post
Hmmgh, on a third gen Prelude the tach signal comes from the negative side of the coil. That's how my H22a is running in my 3rd gen. Are you sure it comes from the ICM on a 5th gen?
yes. in the the helms on page 23-59 it states that "tachometer: indicates 100 rpm at 200 pulses per minute of the ignition control modul (ICM)."


so yes tach gets its readings from icm.
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Old 09-14-2011, 06:55 PM   #9
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Quote:
Originally Posted by djadragon View Post
From my understanding, I had swapped the whole Distributor which included ICM as well. It does the same issue. However, I donít believe there is any issue related cluster. That being said, there were slightly jerks when cursing normal highway speed. I have a feeling I might have a bad TPS???
the icm is the little black box that has the "5th spark plug wire" thingy going to it. theres 4 wires for the cylinders and the last one goes to icm.

as for the jerking is it happening when your ac is on?
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Old 09-14-2011, 07:14 PM   #10
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yes. in the the helms on page 23-59 it states that "tachometer: indicates 100 rpm at 200 pulses per minute of the ignition control modul (ICM)."


so yes tach gets its readings from icm.
Thanks man. I agree, it has to be related to the tach itself. That needle was jumping all over the place. The motor tone didn't seem to change at all.

So OP, are you feeling something from the car when this occurs?
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Old 09-21-2011, 10:26 AM   #11
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Mine does it too... Only in vtec... I dont kno what it is smh
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Old 09-22-2011, 11:50 AM   #12
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my money would be bad coil ive worked at honda for a year now and have seen many cars including my car do this. there is a tsb that has been out for a while on this ill try to pull it up.
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