pinging and knocking under acceleration??
Thread Starter
Burning Brakes
Joined: Sep 2001
Posts: 1,223
Likes: 985
From: Mount Dora, FL
pinging and knocking under acceleration??
I need some help. I have pinging and knocking under any acceleration ( hard or soft). The engine runs fine but it is anoying. Any suggestions as to what I should check first?
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: pinging and knocking under acceleration?? (gwalsh88)
The ECM should pull enought timing to prevent noticible ping as soon as ping is detecetd.
Since that isn't happening I suspect you have a problem with either the ESC module or the knock sensor (these two units work together to send knock information to the ECM on our L98s).
A scan tool would be useful to see if the ECM is pulling timing but just can't pull enough to stop the ping.
If you replace the ESC, use the upgrade P/N shown on my site (link in my sig. below).
Since that isn't happening I suspect you have a problem with either the ESC module or the knock sensor (these two units work together to send knock information to the ECM on our L98s).
A scan tool would be useful to see if the ECM is pulling timing but just can't pull enough to stop the ping.
If you replace the ESC, use the upgrade P/N shown on my site (link in my sig. below).
Race Director
Joined: Aug 2002
Posts: 13,356
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From: tucson AZ
St. Jude Donor '04 & '05
Re: pinging and knocking under acceleration?? (gwalsh88)
Timing light would work just fine.
Also just a quick one, but where and when did you buy gas at the last time?
Good Luck
tony
Also just a quick one, but where and when did you buy gas at the last time?
Good Luck
tony
Team Owner
Joined: Sep 2001
Posts: 62,159
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: pinging and knocking under acceleration?? (gwalsh88)
Yeah, check the Knock and ESC if you can hear it. They may or may not set a SES light, but check for codes.
Check your base timing, you may also need to run higher octane if you dont get it fixed before the next time you drive it.
Check your base timing, you may also need to run higher octane if you dont get it fixed before the next time you drive it.
Thread Starter
Burning Brakes
Joined: Sep 2001
Posts: 1,223
Likes: 985
From: Mount Dora, FL
Re: pinging and knocking under acceleration?? (gwalsh88)
I usually put in super but my last tank was 87 octane ( the service station where I had some work done filled it up for me at n/c) Since then I have put in about 10 gallons of super but no difference. I will check codes using the paper clip method. Thanks
Advanced
Joined: Jul 2000
Posts: 98
Likes: 0
From: Saegertown Pa.
Re: pinging and knocking under acceleration?? (gwalsh88)
If it started knocking after the 87 octane was put in it, run it as close to empty as you can and fill it with high octane. It may take a fill-up or two to get back to normal.
