Service Charging System after cam-
Thread Starter
Melting Slicks
Joined: Jul 2007
Posts: 2,052
Likes: 14
Service Charging System after cam-
Guys, I have searched and I have checked-
Battery
Power wire to the solenoid
Power wire from alt near #1 plug wire
Horn works fine
and...
It only happens while coming to a stop or sitting still. The alternator show between 13.4-14.1 volts depending on the heat of the car.
Now my question-
I do have TR6's so the last thing I need to swap would be the plugs, back to AC Delco.
Has anyone swapped to Autolite or another brand or is AC Delco the only option to get rid of the light?
If so, does anyone know exactly what part number for AC Delco is for the TR6 equivilant?
I know 4177 is the TR6 part number but I can't find a cross refrence for the AC Delco? I'm searching now but I kind of need an answer today of anyone wants to help. Could I just run the AC Delco LS7 plug, part number (AC Delco 41-104)??
I hate this SCS light at every stop-
Battery
Power wire to the solenoid
Power wire from alt near #1 plug wire
Horn works fine
and...
It only happens while coming to a stop or sitting still. The alternator show between 13.4-14.1 volts depending on the heat of the car.
Now my question-
I do have TR6's so the last thing I need to swap would be the plugs, back to AC Delco.
Has anyone swapped to Autolite or another brand or is AC Delco the only option to get rid of the light?
If so, does anyone know exactly what part number for AC Delco is for the TR6 equivilant?
I know 4177 is the TR6 part number but I can't find a cross refrence for the AC Delco? I'm searching now but I kind of need an answer today of anyone wants to help. Could I just run the AC Delco LS7 plug, part number (AC Delco 41-104)??
I hate this SCS light at every stop-
Drifting
Joined: Oct 2006
Posts: 1,608
Likes: 7
From: DELRAY BEACH FLORIDA
St. Jude Donor '10-'13
I'm having the same problem! I also installed a 25% underdrive pulley and EWP at the same time as my cam swap. I installed a new battery and newTR55 plugs were installed at the time of the cam install and I still have the same problem. This is not a constant problem but it does occur a few times a week. I'm going to change the plugs back to stock AC's and see what happens.
Thread Starter
Melting Slicks
Joined: Jul 2007
Posts: 2,052
Likes: 14
I'm going to try the LS7 AC Delco, after reading the tech notes from Callaway-
"LS3 AC Delco p/n 41-985 for 580 hp only (stock LS3 sparkplug)
for SC616, 606, and 652 we recommend AC Delco p/n 41-104 Iridium Spark Plug
(or same heat range as LS7) .040 (1.0mm) gap
LS7, as above"
Link- (LS3/LS7 plugs)
http://www.callawaycars.com/callaway...pportNotes.htm
"LS3 AC Delco p/n 41-985 for 580 hp only (stock LS3 sparkplug)
for SC616, 606, and 652 we recommend AC Delco p/n 41-104 Iridium Spark Plug
(or same heat range as LS7) .040 (1.0mm) gap
LS7, as above"
Link- (LS3/LS7 plugs)
http://www.callawaycars.com/callaway...pportNotes.htm
Thread Starter
Melting Slicks
Joined: Jul 2007
Posts: 2,052
Likes: 14
Thread Starter
Melting Slicks
Joined: Jul 2007
Posts: 2,052
Likes: 14
Installed ZR1 plugs today (AC Delco 41-104's IIRC) and the SCS light is out and my idle voltage has gone from 11.7-12.0 (with TR6 copper) up to 14.3-14.5 with this being the only change.
Just letting you know
Just letting you know
Race Director
Joined: Dec 2005
Posts: 11,866
Likes: 107
From: God's Country, ID
Really strange how some have issues with plugs and others don't? I've run TR6's with MSD wires for 40k miles with no SCS problems (other than a bad connection at the selenoid). I'd be interested to know what wires those that trace the problem to plugs are using?
Thread Starter
Melting Slicks
Joined: Jul 2007
Posts: 2,052
Likes: 14
I just relocated to Ga so I forgot to mention I installed a set of MSD wires hoping it would affect it....nope. As soon as I started the car up (actually about 30 sec in) the SCS light came on (with TR6 coppers).
The only change in the last month was the AC Delco 41-104's.
Alternator wire (good)
Solenoid (good)
My previous 2 C6's (same UD pulley) did not have this problem so.......
I do notice that my current 06 C6 has the normal stamped alternator pulley and my 2 previous C6's had the clutch type alternator pulley....all I can even think of-
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Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
My car didn't do it at idle, it did it while driving. I have a theory that the computer expects a certain alternator output at a certain rpm and due to the underdrive pulley, it's lower than expected so it triggers the code. However, from a practical standpoint, the battery still stays charged and fine with the underdrive pulley. Don't know if that's correct....but the computer definitely tests the alternator output, the test is in there, so this is my hypothesis.
Takes one minute if you have HP Tuners to fix this.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
The PCM/ECU monitors the rotation frequency of the alternator via the horn/sense fuse. If there's noise on this circuit, then the pcm doesn't know how fast the alternator is turning, therefore the wrong charge rate commands get issued to the alternator. Spark plugs and noise they may or may not cause "can be" the cause of this. It happened to me and lots of other people.
Go Canes!
Joined: Dec 2009
Posts: 5,975
Likes: 329
From: Boca Raton FL
St. Jude Donor '11-'12-'13-'14-'15-'16-'17-'18-'19-'20-'21
I've been reading this forum for years. I've never seen anyone come up with a fix for this, when it happens after installation of a underdrive pulley, except for turning off the code. I did that years ago and I don't miss that super loud binging from the warning one bit. And I haven't have any ill effects, my battery doesn't go dead, my car starts, etc.
My car didn't do it at idle, it did it while driving. I have a theory that the computer expects a certain alternator output at a certain rpm and due to the underdrive pulley, it's lower than expected so it triggers the code. However, from a practical standpoint, the battery still stays charged and fine with the underdrive pulley. Don't know if that's correct....but the computer definitely tests the alternator output, the test is in there, so this is my hypothesis.
Takes one minute if you have HP Tuners to fix this.
My car didn't do it at idle, it did it while driving. I have a theory that the computer expects a certain alternator output at a certain rpm and due to the underdrive pulley, it's lower than expected so it triggers the code. However, from a practical standpoint, the battery still stays charged and fine with the underdrive pulley. Don't know if that's correct....but the computer definitely tests the alternator output, the test is in there, so this is my hypothesis.
Takes one minute if you have HP Tuners to fix this.
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
Drifting
Joined: Oct 2004
Posts: 1,790
Likes: 29
From: STL MO
St. Jude Donor '09-'10
I did not have an issue with a light but off idle was pretty rough so I switched from TR-5's back to stock A/C Delco's and the car idles better and comes off idle releasing the clutch with little to no gas applied now. It seemed to be an improvement?
Not totally relevant I realize, I went with a 10% powerbond UD pulley also.
Not totally relevant I realize, I went with a 10% powerbond UD pulley also.
Thread Starter
Melting Slicks
Joined: Jul 2007
Posts: 2,052
Likes: 14
No biggie, when you originally told me that, Jeremy said that only applied to 05's. I may have misunderstood him or something..oh well, I'm good now
My TR6's were worn too and it feels like the car picked up 20rwhp to boot-
