Knock Sensors stopped responding and OAR reset

[StealBlueSHO]

Weird one today... I was driving around town and everything was working great but on my way back from the last stop I noticed the SHO was noticeably down on power.. I look over at my SCT device to check the vitals and saw the the knock sensor PID was stuck at 0 and wasn't adding any spark..

Rolled through and checked my OAR which is always pegged at -.96 and noticed it was stuck at 0 as well... checked my spark and realized I was missing a ton of it.. and the knock sensors weren't working..

Get home, turn the car off, and then turn it back on a bit later to go to the store again... (You never make just ONE trip to homedepot...).. Knock sensors are working again but my OAR got reset..

Really weird... I have no clue what happened... not liking the random non-reporting of the knock sensors.. at all... 

 

[ZSHO]

Battery sufficient!  Z

 

[SHOdded]

check the knock sensor wiring?  pest issues?

 

[ZSHO]

https://drive.google.com/file/d/0B8JUL90DXgdiTVFJcWZxODJrc2RhUWNUYnI1WWpVd05jSERr/view?usp=sharing . Z

https://drive.google.com/file/d/0B8JUL90DXgdiMHlpZG5RLS1mTjJndFgxLWx5cHRQcnp1ajgw/view?usp=sharing

 

[StealBlueSHO]

Did it again today.... need to get the battery checked... gonna flash down to the LMS tune for now until I get this straightened out...

I have noticed lately it is idling a little rough and when the fans kick on it idles even rougher...

 

[Skydogs]

Sounds like a battery,  fans draw a lot and sounds like battery is struggling with any kind of load. Good luck man

 

[dubcitySHO]

Mine never had an issue with the OAR resetting but I did get an intermittently rough idle when my battery was on its way out.

I need to grab a datalog as my knock sensors are pulling almost 5 degrees in 3rd gear.  Also noticed my car was seriously down on power and that would be my culprit.  Suspected had gas.  OAR is still @ -0.96 though so IDK....

 

[StealBlueSHO]

Mine never had an issue with the OAR resetting but I did get an intermittently rough idle when my battery was on its way out.

I need to grab a datalog as my knock sensors are pulling almost 5 degrees in 3rd gear.  Also noticed my car was seriously down on power and that would be my culprit.  Suspected had gas.  OAR is still @ -0.96 though so IDK....

I think Brad used to have his tunes set to pull 2 degrees of spark for every +1 of KR... so if you are pulling 5 degrees of, then you are probably on seeing around +2.5 KR which wouldn't be enough to move OAR.. anything over +4 or higher should start to raise OAR..

If its something new, then its probably bad gas, if you have some E85 nearby you could throw a gallon or so into it so see if it stabilizes it.

Yea, my idle has been rough lately...

 

[dubcitySHO]

Thanks for the info Stealblue.  I'm not trying to thread jack but I do appreciate the insight.

I saw +4.5KR briefly.  I thought that was 4.5 degrees total.

 

[StealBlueSHO]

Thanks for the info Stealblue.  I'm not trying to thread jack but I do appreciate the insight.

I saw +4.5KR briefly.  I thought that was 4.5 degrees total.

Depends on how he has your tune setup.. that could be as much as 9 degrees pulled... Brad is aggressive on pulling spark when the knock sensors pickup possible knock conditions... which is good thing as far as I am concerned.

When your battery was bad, did you take it to local shop to have them test it? or had it gotten bad enough to know that was it?

 

[StealBlueSHO]

Looks ominous..

 

[dubcitySHO]

When your battery was bad, did you take it to local shop to have them test it? or had it gotten bad enough to know that was it?

I took it to my mechanic and he tested it.  It was the OEM battery so not to shabby.  Replaced it with the BTX65850 recommended by many on the forum.

 

[ZSHO]

Looks ominous..

New Battery is in order.! It kind of explains the intermittent issues.  Z 

 

[StealBlueSHO]

Looks ominous..

New Battery is in order.! It kind of explains the intermittent issues.  Z

Getting battery tested today... the KAM is getting reset in middle of driving for some reason... plus the rough idle and rougher idle during fan operations seems to indicate either a battery issue or connection issue.. I hope its not the alternator.. getting that checked too..

 

[StealBlueSHO]

So battery tested at 558 cca... after a 20 mile drive. Battery has been replaced. Alternator tested perfect.

Hopefully that was the issue... we will see...

 

[SHOdded]

Fingers crossed!

 

[StealBlueSHO]

Definitely idles much better now... time will tell if the KAM doesn’t reset while driving... it’s a 21 mile drive door to door from my buddies shop... almost home... so far so good...

 

[ZSHO]

X2 - Fingers crossed bud.  Z

 

[StealBlueSHO]

Curious... is the stick battery only 650CCA? That is what was in mine... I went ahead and put in the 850CCA.. I figured with the alky pump in there it wouldn't hurt to get a stronger battery.

 

[SHOdded]

yes stock is 650 cca.