00 z28 timing trouble

derek0122 · 12-23-2012, 12:33 AM

Ok so def need an expert on this one. Had my ls1 tuned, its a motor tune. (also had nitrous tune and done same thing ). The issue im having is when I accelerate hard to race my car drops timing. We had it at 23 degrees and it dropped to 10 degrees. You can force it with the laptop to hold the time but on its on it drops. What could cause this. Thanks in advance for any help or suggestions.

1998ta__1991rs · 12-23-2012, 12:46 AM

Knock sensors and or knock sensor harness.

TurboWS6 · 12-23-2012, 12:53 AM

Quote:

Originally Posted by 1998ta__1991rs

Knock sensors and or knock sensor harness.

Bingo

derek0122 · 12-23-2012, 01:24 AM

The knock sensors will cause that? Dam .. that's why I asked the experts cause I would have never thought of that. Thanks! Will check tomorrow and let ya know what I find. Again thanks for the info

2001hawk · 12-23-2012, 01:34 AM

Quote:

Originally Posted by derek0122

The knock sensors will cause that? Dam .. that's why I asked the experts cause I would have never thought of that. Thanks! Will check tomorrow and let ya know what I find. Again thanks for the info

Unless you ask shartbody. His seems to be the only motor that won't pull timing.

98Camarod · 12-23-2012, 11:23 AM

You can log everything that can/will retard the timing and see what's doing it

derek0122 · 12-23-2012, 06:38 PM

Unplugged the knock sensor and deleted them from the computer and my car ran like a scalded grape ape! Thanks for the help!

1998ta__1991rs · 12-23-2012, 08:14 PM

I'd plug them back in, if it is sencing spark knock that much it'll beat the bearings out of. It with all the timing

BigdaddyDupree · 12-23-2012, 08:28 PM

I know a guy that works at Gm that can get you the parts.

LXtasy · 12-23-2012, 09:04 PM

Quote:

Originally Posted by BigdaddyDupree

I know a guy that works at Gm that can get you the parts.

Some say he is the sexiest parts guy GM has

03SVTCOBRA · 12-23-2012, 09:30 PM

Quote:

Originally Posted by LXtasy

Some say he is the sexiest parts guy GM has

Some?? Ive been trying to find 1 person to say otherwise.

04ctd · 12-23-2012, 10:03 PM

Quote:

Originally Posted by LXtasy

Some say he is the sexiest parts guy GM has

and if he's lucky, i will be buying him breakfast in the AM while my TPMS sensors are installed....

GreebeanZ28 · 12-23-2012, 10:49 PM

Pffffft. I aint got no knock sensuh's.

derek0122 · 12-23-2012, 11:45 PM

Well it wasn't the knock sensors . Ran good for a bit went to race a ta and started doing the same thing again. Could it be the computer?

ElecTech · 12-24-2012, 12:55 AM

Quote:

Originally Posted by derek0122

Well it wasn't the knock sensors . Ran good for a bit went to race a ta and started doing the same thing again. Could it be the computer?

You really need to log all the timing PIDs so you can figure out what is going on. Sounds like you're sort of killing skeeters with a shotgun.

98Camarod · 12-24-2012, 07:29 AM

It won't let me upload it, but I have a timing evaluation cfig that has everything that can adjust timing. Send me your email and you can use it as well to see what your problem is.

12-23-2012, 12:33 AM	#1
derek0122 Senior Member Join Date: Nov 2012 Location: branchville sc Posts: 89	00 z28 timing trouble Ok so def need an expert on this one. Had my ls1 tuned, its a motor tune. (also had nitrous tune and done same thing ). The issue im having is when I accelerate hard to race my car drops timing. We had it at 23 degrees and it dropped to 10 degrees. You can force it with the laptop to hold the time but on its on it drops. What could cause this. Thanks in advance for any help or suggestions.

12-23-2012, 12:46 AM	#2
1998ta__1991rs Senior Member Join Date: Jun 2008 Location: West Ash Posts: 4,283	Knock sensors and or knock sensor harness. __________________ Funny

12-23-2012, 08:14 PM	#8
1998ta__1991rs Senior Member Join Date: Jun 2008 Location: West Ash Posts: 4,283	I'd plug them back in, if it is sencing spark knock that much it'll beat the bearings out of. It with all the timing __________________ Funny

12-23-2012, 08:28 PM	#9
BigdaddyDupree Senior Member Join Date: Jul 2008 Location: MACEDONIA Posts: 4,967	I know a guy that works at Gm that can get you the parts. __________________ . What you wanna do?

12-23-2012, 10:49 PM	#13
GreebeanZ28 Senior Member Join Date: Oct 2011 Location: Easley Posts: 2,300	Pffffft. I aint got no knock sensuh's. __________________

12-23-2012, 01:24 AM	#4
derek0122 Senior Member Join Date: Nov 2012 Location: branchville sc Posts: 89	The knock sensors will cause that? Dam .. that's why I asked the experts cause I would have never thought of that. Thanks! Will check tomorrow and let ya know what I find. Again thanks for the info

12-23-2012, 11:23 AM	#6
98Camarod Senior Member Join Date: Mar 2009 Location: Summerville, SC Posts: 1,525	You can log everything that can/will retard the timing and see what's doing it

12-23-2012, 06:38 PM	#7
derek0122 Senior Member Join Date: Nov 2012 Location: branchville sc Posts: 89	Unplugged the knock sensor and deleted them from the computer and my car ran like a scalded grape ape! Thanks for the help!

12-23-2012, 11:45 PM	#14
derek0122 Senior Member Join Date: Nov 2012 Location: branchville sc Posts: 89	Well it wasn't the knock sensors . Ran good for a bit went to race a ta and started doing the same thing again. Could it be the computer?

12-24-2012, 07:29 AM	#16
98Camarod Senior Member Join Date: Mar 2009 Location: Summerville, SC Posts: 1,525	It won't let me upload it, but I have a timing evaluation cfig that has everything that can adjust timing. Send me your email and you can use it as well to see what your problem is.