Im Concerned....
11-23-2006, 12:56 AM
#15
4th Gear Member
Join Date: Sep 2006
Location:
Posts: 1,031
RE: Im Concerned....
Marbles rattling around is the classic sound of an engine pinging (pre-ignition).
Like the others said 20mph is too slow for 4th so you are bogging down the motor.
Try going up a hill in the appropriate gear for your speed and see if it pings.
Sounds like a bad tune which is screwing with the timing / mixture in a bad way.
FWIW I wouldn't drive the car like this if I were you because damage can result.
If you *must* drive it, go easy on the gas and the second you hear the marbles back off the gas a little.
Basically what is happening is the fuel is igniting at the wrong time with respect to the location of the piston in the
cylinder. If you can picture the piston on it's way down and the fuel explodes at the point where say the
piston is still at the 1/2 way point coming down, you can see this is not a good thing because the inertia is trying
to push the piston down and the fuel exploding it trying to push it back up again at the same time.
This is just an extreme example, but it's not a good thing....
Good luck!
Like the others said 20mph is too slow for 4th so you are bogging down the motor.
Try going up a hill in the appropriate gear for your speed and see if it pings.
Sounds like a bad tune which is screwing with the timing / mixture in a bad way.
FWIW I wouldn't drive the car like this if I were you because damage can result.
If you *must* drive it, go easy on the gas and the second you hear the marbles back off the gas a little.
Basically what is happening is the fuel is igniting at the wrong time with respect to the location of the piston in the
cylinder. If you can picture the piston on it's way down and the fuel explodes at the point where say the
piston is still at the 1/2 way point coming down, you can see this is not a good thing because the inertia is trying
to push the piston down and the fuel exploding it trying to push it back up again at the same time.
This is just an extreme example, but it's not a good thing....
Good luck!
11-23-2006, 02:50 AM
#18
3rd Gear Member
Join Date: Mar 2005
Location:
Posts: 940
RE: Im Concerned....
i have the same problem with my car but it does it with both 87 and 93 tune and i used 93 octane with both tunes, i tried everything to get rid of it. I think the only real solution is getting a professional to tune the car.
11-23-2006, 03:51 AM
#19
4th Gear Member
Join Date: Sep 2006
Location:
Posts: 1,031
RE: Im Concerned....
ORIGINAL: wildazme
i have the same problem with my car but it does it with both 87 and 93 tune and i used 93 octane with both tunes, i tried everything to get rid of it. I think the only real solution is getting a professional to tune the car.
i have the same problem with my car but it does it with both 87 and 93 tune and i used 93 octane with both tunes, i tried everything to get rid of it. I think the only real solution is getting a professional to tune the car.
On older cars carbon buildup can also cause pinging.
Some GM Top Engine cleaner does a good job of cleaning things out.
It's not for the faint of heart though!
Lot's of smoke!!!!
And make sure to follow the instructions to the letter including changing oil and filter after the treatment.
11-23-2006, 12:37 PM
#20
Banned
Thread Starter
Join Date: Aug 2006
Location: florida
Posts: 872
RE: Im Concerned....
So I should call up mustangtuning and ask them whats up I guess. One more question if the car is pinging, would it do it in neutral as well? What I mean is if I let it sit in my driveway and then rev it to like 4k would it do it or does a car only ping when the engine is under load?