can't rid the ping
This is my steps for finding KR:
Is there any audible detonation? yes-reduce timing in effected area / add fuel
No Audible knock: Is there a pipe banging, clogged CAT, spark plugs, oil in combustion chamber? Correct as needed, if no....Use race gas mix to determine if its false KR and retune accordingly.
I currently had 1-2* KR during qtr passes, but not in the same cells each run, off by a few during the shifts etc. I reduced timing from 31* to 22* in increments of 2* and each time the KR was still there. I wouldnt be able to hear KR if the engine was about to blow, so I went timing, then looked at fueling. Both good. Stood outside the car today and heard the pass. pipe after the X banging! Damn it. Found my source.
Is there any audible detonation? yes-reduce timing in effected area / add fuel
No Audible knock: Is there a pipe banging, clogged CAT, spark plugs, oil in combustion chamber? Correct as needed, if no....Use race gas mix to determine if its false KR and retune accordingly.
I currently had 1-2* KR during qtr passes, but not in the same cells each run, off by a few during the shifts etc. I reduced timing from 31* to 22* in increments of 2* and each time the KR was still there. I wouldnt be able to hear KR if the engine was about to blow, so I went timing, then looked at fueling. Both good. Stood outside the car today and heard the pass. pipe after the X banging! Damn it. Found my source.
Thread Starter
TECH Regular
Joined: Jan 2004
Posts: 496
Likes: 0
From: GARDEN GROVE, CA
My lt's are negative at part throttle stock and go to 0 at wot just as they should. I replaced the front 02's and one of the back one's was replaced under warranty. When the driverside cat was bad I got the rotten egg smell. I don't have that. I do get a rich smell going wot for long periods. The shop I took the car to for a dyno run said it's the 91 octane fuel here in Ca. I had no pinging during that dyno run. When I was using the 160 thermostat I also used the predator tune and had no wot pinging but lots of part throttle pinging. My mpg was great with those two things. I'm gonna go and put the 160 thermostat back in and I just ordered some NGK TR6 plugs. When I pull the plugs I'm gonna spray some Seafoam down each head opening. I don't use much oil at all. Maybe a 2 cups at most between oil changes. I do have bad pistonslap that now doesn't go away even when warmed up.
My fuel pressure is fine too at 60 psi.
My fuel pressure is fine too at 60 psi.
Originally Posted by rich Z
My lt's are negative at part throttle stock and go to 0 at wot just as they should. I replaced the front 02's and one of the back one's was replaced under warranty. When the driverside cat was bad I got the rotten egg smell. I don't have that. I do get a rich smell going wot for long periods. The shop I took the car to for a dyno run said it's the 91 octane fuel here in Ca. I had no pinging during that dyno run. When I was using the 160 thermostat I also used the predator tune and had no wot pinging but lots of part throttle pinging. My mpg was great with those two things. I'm gonna go and put the 160 thermostat back in and I just ordered some NGK TR6 plugs. When I pull the plugs I'm gonna spray some Seafoam down each head opening. I don't use much oil at all. Maybe a 2 cups at most between oil changes. I do have bad pistonslap that now doesn't go away even when warmed up.
My fuel pressure is fine too at 60 psi.
My fuel pressure is fine too at 60 psi.
The reason I asked if 17* is what's programmed versus what's logged. There is a optimal timing table in EFI and in HPT it's called average mean best, I think. No matter where I set my timing in High Octane, under load my timing reverts to the Optimal table. In my case that's 3* more.
Anyone know what the trigger for the switch is?
Originally Posted by gojo
RichZ,
The reason I asked if 17* is what's programmed versus what's logged. There is a optimal timing table in EFI and in HPT it's called average mean best, I think. No matter where I set my timing in High Octane, under load my timing reverts to the Optimal table. In my case that's 3* more.
Anyone know what the trigger for the switch is?
The reason I asked if 17* is what's programmed versus what's logged. There is a optimal timing table in EFI and in HPT it's called average mean best, I think. No matter where I set my timing in High Octane, under load my timing reverts to the Optimal table. In my case that's 3* more.
Anyone know what the trigger for the switch is?
Originally Posted by WS6FirebirdTA00
which table is this in hp tuners i dont recall seeing this?? are you sure you are having pistion slap and its not a bad lifter? maybe the lifter creates enough ticking at part throttle to sound like audible knock but it isnt, and the knock sensors may pick this up as knock as well, since they are right by the lifters. you may not hear it on WOT bucause the oil pressure is higher and may be pumping them up better. do u get KR at wot as well? i dont remember if you said this or not
The table is in Spark Advance and is named Mean Best Timing.
Originally Posted by gojo
I don't have the problem. I'm responding to the original poster.
The table is in Spark Advance and is named Mean Best Timing.
The table is in Spark Advance and is named Mean Best Timing.
thanks, im going to check that table out
Originally Posted by WS6FirebirdTA00
haha i know you dont, just kinda ran my question in with a response to him, sorry for the confusion
thanks, im going to check that table out
thanks, im going to check that table out
for Optimal and High octane, would have an adverse affect on anything else. The definition in EFI is:"This table is used as a reference for what would be best timing, which is then used for various torque calculations." Kind of vague. But, my car is selecting the Optimal Table at WOT anyway, so it seems like a good idea.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Originally Posted by gojo
I wonder if setting the timing, in the higher rpm, gm/cyl area, the same
for Optimal and High octane, would have an adverse affect on anything else. The definition in EFI is:"This table is used as a reference for what would be best timing, which is then used for various torque calculations." Kind of vague. But, my car is selecting the Optimal Table at WOT anyway, so it seems like a good idea.
for Optimal and High octane, would have an adverse affect on anything else. The definition in EFI is:"This table is used as a reference for what would be best timing, which is then used for various torque calculations." Kind of vague. But, my car is selecting the Optimal Table at WOT anyway, so it seems like a good idea.
so yours goes into the optimal at WOT? from what i can tell all my numbers are comming from the high octane table.
here is what was in hp tuners
Mean Best Timing
Max Torque Timing vs. RPM vs. Cyl Air: Theoretical spark advance that delivers maximum torque. PCM torque calculation routines reference this table when estimating current engine torque output relative to theoretical maximum. We do not recommend modifying this table.
Originally Posted by WS6FirebirdTA00
so yours goes into the optimal at WOT? from what i can tell all my numbers are comming from the high octane table.
here is what was in hp tuners
Mean Best Timing
Max Torque Timing vs. RPM vs. Cyl Air: Theoretical spark advance that delivers maximum torque. PCM torque calculation routines reference this table when estimating current engine torque output relative to theoretical maximum. We do not recommend modifying this table.
here is what was in hp tuners
Mean Best Timing
Max Torque Timing vs. RPM vs. Cyl Air: Theoretical spark advance that delivers maximum torque. PCM torque calculation routines reference this table when estimating current engine torque output relative to theoretical maximum. We do not recommend modifying this table.
Originally Posted by gojo
Thanks for the definition. Seems I should look elsewhere for whatever is increasing my timing at WOT. Odd that it it's equivelant to the Optimal table.
Originally Posted by rich Z
When I pull the plugs I'm gonna spray some Seafoam down each head opening.
Aria
Originally Posted by Beuke 23
Is Seafoam liquid? If so, you can hydrolock your engine, no? You'll have puddles of liquid that can't be compressed when you turn the engine over. Unless this thing totally evaporates by the time you crank the engine.
Aria
Aria
Thread Starter
TECH Regular
Joined: Jan 2004
Posts: 496
Likes: 0
From: GARDEN GROVE, CA
I have thought about the bad lifter option but since how loud the slap depends on engine temp, colder out louder slap, warm out not much slap. However the noise used to always go away once warmed up but started not going away 2 months ago. Also another thing I forgot to say is that a week ago when I changed the fuel filter the fuel coming out the filter was grey/brown. I got a syphon to take out some gas from the botton of the tank to see if it's fine. Don' I have the time to check. Been thinking about having the injectors cleaned.
Thread Starter
TECH Regular
Joined: Jan 2004
Posts: 496
Likes: 0
From: GARDEN GROVE, CA
Originally Posted by WS6FirebirdTA00
try to drop the tank and clean it, if u have time