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[mcdonaldroadcapt]

I have a 2008 flhtcuse3 with 45,000 miles. Just replaced starter and has new Harley battery. On occasion when I try to start hot engine, it will barely try to turn over. If I release starter button and try again, it will spin. I am thinking that the ACR's are not kicking in on starts. I have a built 95 engine in my springer with manual releases. My 2008 sounds exactly like the 95 engine when I forget to press in the compression releases. Anyone else experience this type of problem?

[mcdonaldroadcapt]

What are signs of ACR failure. If happens, any trick to awaken the sleeping ACR to crank so starter does not get damaged?

[sadunbar]

What are signs of ACR failure. If happens, any trick to awaken the sleeping ACR to crank so starter does not get damaged?

Check your compression.  That will tell you if your ACR's are working or not...   

[mcdonaldroadcapt]

My problem is an occasional hot engine start. ACR or 's not opening when I turn on the switch, I think.

[mcdonaldroadcapt]

Can someone walk me through the code checking procedure for my 2008  FLHRCUSE3. Want to see if a code is showing for a weak signal to ACR from ECM. Someone said this could be the problem. Thanks

[mcdonaldroadcapt]

Found old post on trouble codes. Thanks anyway.

[mcdonaldroadcapt]

Check your compression.  That will tell you if your ACR's are working or not...   

Thanks. Buying a tester today and checking the readings.

[ultrafxr]

Could also be weak / marginal battery.  I was having similar problems on my '07 a few years ago.  Thought it was the starter.  Dealer tech ran load test on battery and said it was bad.  I doubted him even though he had the printout from the test as the battery was only a couple years old and is always on tender when not riding.  But I replaced the battery and that did indeed solve the problem for me.

[mcdonaldroadcapt]

Wish it would be that simple but the bike has a new Harley Battery. However, I will double check ground on battery to be sure it is tight. Thanks.

[GMR-PERFORMANCE]

Ok this is a common post and most people and well many shops also have posted and have no idea how they work,

 The ACR is not a open closed  valve.  The ECM looks at several items to determine the duty cycle in which the acr will be run at. It is driven like a fuel injector. So Cranking rpm is one of those data items.  Weak signal  would be pretty odd... As the ECM would just ramp up the duty cycle..  The factory acr can handle just about any street and even race comp ratio within reason. I can tell you first hand they will take a 245 CCP engine and reduce it down enough that a stock starter can spin it over with ease.

Kick back on hot starts can be a bad comp , incorrect tune, IAC setting wrong, the list is huge but the ACR itself are not fool proof but they do work very well.. Simple test is look behind the air cleaner backing plate and un plug them and do a compression test . Then plug them back in and re test.


As for the comp test you DO NOT HAVE TO PROP THE T BLADE OPEN.  It may take a few more revolutions on the starter but it will achieve the max compression the engine can pump.  FBW will crack the blade open for you as it cranks it has to the t/b has no IAC motor.

Tested this many times and your numbers will not change. Good luck 

[mcdonaldroadcapt]

Thanks. Valuable information. Was in process of performing compression test today and rear plug cross threaded while removing. Never has happened to me in my fifty-five years of changing plugs in my bikes. Not a good day. Thanks again.

[Twolanerider]

Thanks. Valuable information. Was in process of performing compression test today and rear plug cross threaded while removing. Never has happened to me in my fifty-five years of changing plugs in my bikes. Not a good day. Thanks again.

Able to clean things out and install an insert?  Or pulling the head?

[sadunbar]

If your ACR's are opening, your compression will be in the 150 psi range.  If your ACR's are not opening, your compression will be in the 210 psi range...

[mcdonaldroadcapt]

Understand and thanks.