Ping even with Premium
Thread Starter
Le Mans Master
Joined: Feb 2003
Posts: 6,682
Likes: 144
From: Memphis Tennessee
Ping even with Premium
Went to pass a truck on a two-lane today. Just a moderate pull from low in 3rd (MN6) and at first it pinged quite a bit. I guess the computer took over and retarded the timing. She did pull hard, just didn't remember all the ping.
She gets a steady diet of PREMIUM so I don't know what else to do. Is there a problem with my AE or the fuel?
She gets a steady diet of PREMIUM so I don't know what else to do. Is there a problem with my AE or the fuel?
Melting Slicks
Joined: Dec 2003
Posts: 2,857
Likes: 2
From: pawleys island sc
Originally Posted by feeder82
might be carboned up time for Sea-foam or other de-carbon trick
plus some good injector cleaner like Red Line. If that doesn't do it you might need a tune.
Le Mans Master
Joined: May 2006
Posts: 7,835
Likes: 223
From: Hillsboro OR
Mine was pinging too.....
It was happening at WOT. I had it tuned by Scoundrl. He found my LTFT table wasw adding from 6% - 15% more fuel and my spark table was pulling timing. We also found that I had a pre-MAF air leak. He cleared the tables and we sealed the airleak. Now the car screams! 
We aren't 100% sure why the tables were adding gas and pulling timing but, he suspects the MAF might be dirty. We will look at that as soon as it STOPS RAINING! 
Ken did an awesome job tuning my car. I have a stock 03 Coupe, A4 with a VaraRam. Now, from about 30 mph I can stomp the loud pedal and the tires break loose from the 2-3 and the 3-4 shift!!!
Thanks again Ken!!!
We aren't 100% sure why the tables were adding gas and pulling timing but, he suspects the MAF might be dirty. We will look at that as soon as it STOPS RAINING! Ken did an awesome job tuning my car. I have a stock 03 Coupe, A4 with a VaraRam. Now, from about 30 mph I can stomp the loud pedal and the tires break loose from the 2-3 and the 3-4 shift!!!
Thanks again Ken!!!
Tech Member
Joined: Dec 2005
Posts: 80
Likes: 0
From: Claremont CA
Originally Posted by ALLEGRO
Went to pass a truck on a two-lane today. Just a moderate pull from low in 3rd (MN6) and at first it pinged quite a bit. I guess the computer took over and retarded the timing. She did pull hard, just didn't remember all the ping.
She gets a steady diet of PREMIUM so I don't know what else to do. Is there a problem with my AE or the fuel?
She gets a steady diet of PREMIUM so I don't know what else to do. Is there a problem with my AE or the fuel?
If it is a fuel octane issue and the high and low octane spark tables have enough spread then the cal should compensate for it as long as the tune was done correctly.
There is also a strong possibility of carbon build up. GM or Delco has a top engine cleaner that works really well. Doing this properly involves sucking that X66 fluid through the intake for a while and then stalling the engine out being careful not to hydraulic anything. (This really should be done by someone with experience) After letting it soak for a bit (1/2 hour or so) restart the vehicle and run it until the exhaust is clear. Then a plug and oil change should be performed to finish off the job.
If you have any further questions please let me know.
Regards,
Team Owner
Joined: May 2004
Posts: 26,345
Likes: 231
From: SoCal
Originally Posted by Bluefire
We also found that I had a pre-MAF air leak. He cleared the tables and we sealed the airleak.
DH
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Tech Member
Joined: Dec 2005
Posts: 80
Likes: 0
From: Claremont CA
Originally Posted by Bluefire
My understanding is that it would give you more of a non-laminar airflow. It's just my best guess though. I am not sure.
That is partially correct, some of the cold air devices actually change the MAF transfer function as the MASS AIR FLOW SENSOR does not directly measure the MASS of air, it INFERS it based upon a calibration table consisting of a parabolic curve where the output signal (frequency in GM's case) = x Grams/sec.
So a leak that allowed for an unstable condition prior to the MAF could affect the output.
Regards,
Scott
Team Owner
Joined: May 2004
Posts: 26,345
Likes: 231
From: SoCal
Originally Posted by SBTuner
That is partially correct, some of the cold air devices actually change the MAF transfer function as the MASS AIR FLOW SENSOR does not directly measure the MASS of air, it INFERS it based upon a calibration table consisting of a parabolic curve where the output signal (frequency in GM's case) = x Grams/sec.
So a leak that allowed for an unstable condition prior to the MAF could affect the output.
Regards,
Scott
So a leak that allowed for an unstable condition prior to the MAF could affect the output.
Regards,
Scott
It appears you are pretty knowledgable
Would you please check out this thread and add your opinion:
http://forums.corvetteforum.com/show....php?t=1550303
Also on LS1 Tech:
http://www.ls1tech.com/forums/showthread.php?t=613321
DH
Tech Member
Joined: Dec 2005
Posts: 80
Likes: 0
From: Claremont CA
Originally Posted by Dirty Howie
Scott
It appears you are pretty knowledgable
Would you please check out this thread and add your opinion:
http://forums.corvetteforum.com/show....php?t=1550303
DH
It appears you are pretty knowledgable
Would you please check out this thread and add your opinion:
http://forums.corvetteforum.com/show....php?t=1550303
DH
http://forums.corvetteforum.com/show...post1557848571
With some additional data there comes an explanation!
Take care,
Scott