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post #1 of 12 (permalink) Old 08-31-2014, 02:57 PM Thread Starter
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Engine Compression Test Question....

This is a 2010 FLTRX with 51,862mi. In my mind it's time to do a compression check. The question becomes is this bike "ACR" (automatic compression relief) equipped? I don't know and I'm not sure how to find out. IF it is ACR equipped I'm supposed to remove the ACR system relay at the fuse box which might set off diagnostic trouble codes.........crap. So how do I find out?? HELP PLEASE

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post #2 of 12 (permalink) Old 08-31-2014, 06:35 PM
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Not equipped.96 inch never had .
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post #3 of 12 (permalink) Old 08-31-2014, 06:37 PM Thread Starter
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not equipped.96 inch never had .
thanks!!


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post #4 of 12 (permalink) Old 09-01-2014, 12:00 AM
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2010 did not have them unless you have 103 motor or cvo.
When you do it make sure you hold open throttle blade for the right reading
We discount fuel pump by pulling fuel pump fuse also. You may get a ex heck engine code for tbw but you can clear it through speedo
Thanks
FD


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This is a 2010 FLTRX with 51,862mi. In my mind it's time to do a compression check. The question becomes is this bike "ACR" (automatic compression relief) equipped? I don't know and I'm not sure how to find out. IF it is ACR equipped I'm supposed to remove the ACR system relay at the fuse box which might set off diagnostic trouble codes.........crap. So how do I find out?? HELP PLEASE

Nevadasun
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post #5 of 12 (permalink) Old 09-01-2014, 12:27 AM Thread Starter
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Thanks Frank, I think when you say "you can clear it through speedo" you mean take it on the highway and run it. Right?

Oh, your S/C/S 4's still look and sound great.......


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post #6 of 12 (permalink) Old 09-01-2014, 11:04 AM
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The DTCs will be displayed on the odometer on the speedometer, all the info on how to access and clear the DTCs are in a sticky in the troubleshooting section.

MAKE SURE TO PULL THE TCA PLUG BEFORE PERFORMING THE COMPRESSION TEST. Failure to pull the plug will cause the TCA gears to STRIP when you hold the throttle plate open, you will need a new Throttle Body to fix the strip TCA gears.


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post #7 of 12 (permalink) Old 09-01-2014, 12:37 PM Thread Starter
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The service manuel didn't say anything about pulling the TCA plug. However I just need to know if this is it?



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Last edited by Nevadasun; 09-01-2014 at 01:03 PM.
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post #8 of 12 (permalink) Old 09-01-2014, 08:42 PM
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If my memory Serves me right you have Tmax you can clear codes there.


QUOTE=Nevadasun;2163194]Thanks Frank, I think when you say "you can clear it through speedo" you mean take it on the highway and run it. Right?

Oh, your S/C/S 4's still look and sound great.......[/QUOTE]
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post #9 of 12 (permalink) Old 09-02-2014, 10:59 AM
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Quote:
Originally Posted by Nevadasun View Post
The service manuel didn't say anything about pulling the TCA plug. However I just need to know if this is it?

Yes that is the plug that you need to disconnect before doing the compression test. You will get DTCs because the plug is pulled but you can clear the DTCs before riding by using the speedometer or if you have the T-Max you can use that too.
It is easy to just use the speedometer to clear the DTCs and you don't have to hook up the PC.

The reason you pull the TCA plug is because you are holding the throttle plate open and the ECM wants the throttle plate to be in the idle position. The TCA motor is trying to force the throttle plate to idle position and it can not because you are holding the throttle plate open. The plastic gears in the TCA will strip making your throttle body useless and the TCA is a non serviceable part which require a new throttle body to fix the TCA gears /motor.


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Last edited by ironmark; 09-02-2014 at 11:23 AM.
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post #10 of 12 (permalink) Old 09-02-2014, 11:36 AM Thread Starter
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Well, I've decided not to do the compression test. I don't have a speedometer or a T-Max so, I have no way of clearing the codes. I'm sure as hell not going to take it to Harley to get the codes cleared. They say ignorance is bliss, I'll stay blissful on this one.


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