pinging sound with accelleration only
Le Mans Master
Joined: Jun 2004
Posts: 6,269
Likes: 50
From: Dallas Texas
St. Jude Donor '06-'07-'09-'10
Originally Posted by yellow01
Ok, I'm not expert, but wouldn't poor gas cause knock or detonation?
I've always separated ping from knock/detonation in my mind. I would expect ping to be more related to carbon or hot-spots causing very localized explosion but not early detonation/knock which would be caused by poor gas.
Wouldn't lower octane (thereby not supporting higher compression) cause more of a generalized knock due to a more macroscopic detonation/early ignition in the cyllinder?
Again, no expert, didn't stay in a Holiday Inn Express last night either
I've always separated ping from knock/detonation in my mind. I would expect ping to be more related to carbon or hot-spots causing very localized explosion but not early detonation/knock which would be caused by poor gas.
Wouldn't lower octane (thereby not supporting higher compression) cause more of a generalized knock due to a more macroscopic detonation/early ignition in the cyllinder?
Again, no expert, didn't stay in a Holiday Inn Express last night either
I've stayed at lots of Holiday Inn Expresses and it hasn't helped me a bit.
By poor gas, do you mean old (not fresh) or poor quality. I think you'll find that spark knock, detonation, and pinging are different words for the same thing, pre-ignition. Whether it's poor gas or too low an octane gas in a high compression engine pre-ignition will result. Under light loading, you hear pinging. Increase the load and it becomes knocking and going to high rpm and high load like drag racing, it become destructive detonation.
Racer
Joined: Mar 2006
Posts: 366
Likes: 1
From: Esparto ca
Is it stock. Have you done any re-programming. If so, maybe your timing is a little too advanced, or possibly weak injectors causing a lean condition. You knock sensor should detect and correct the problem, but if your base timing is too far advanced it cant. Maybey your knock sensor is bad. Maybe you just got cheap gas. Dont go with octane boosters or race gas, just put in union 76 or chevron when close to empty see if your prob goes away.
Safety Car
Joined: Jul 2005
Posts: 4,275
Likes: 4
From: Vancouver WA
Originally Posted by goady911
just noticed when i accellerate in reverse it does not do it, until i apply my brakes now it will do it a little , sounds like its coming from right front.
Providing you haven't changed the timing or Air Fuel Ratio, there is only two things that will cause ENGINE pinging. Low grade or bad gas is one. Carbon buildup is the second.
These motors suck oil into the intake via PVC valve, and has to be decarbed every now and then. If you have some fresh gas and it still does it, then you have a carbon build up problem.
Instructor
Joined: Aug 2005
Posts: 133
Likes: 0
From: OKC OK
Originally Posted by Evil-Twin
Ping is a condition cause by a load to the engine where the octane can not support the timing... and pre-ignite under load before it should this cause the engine to fire before the top of the power stroke thus causing engine ping. Left alone this could cause wrist pin damage, connecting rod bearing damage and Long term could blow a hole in the top of a piston...
http://www.avweb.com/news/columns/182132-1.html
When the link is opened, it'll be clear that the article deals with airplane motors, and I do concede that airplane motors and car motors are designed for different things. However, the article has a great description of pinging; caused either by detonation (after the ignition event) or pre-igntion (before the igntion event). Just more food for thought.
R/
Dustin
