6th Gear Poster
Join Date: Jun 2003
Location: Millbrook, Alabama
Ping under load....need opinions
I've attempted to clean the carbon from my engine with the Motorcraft PM-2 cleaner...three cans worth. I'm not sure if it has made any difference.
I've suspected for quite a while that my problem wasn't all because of carbon, but I'm not sure what it is, or how to fix it. Let's assume for a minute that it isn't due to carbon build up.
When the engine is cold....I can nail it and there is no problem with ping whatsoever. When normal operating temperature is reached (N on Normal in temp gage) the ping is bad under load starting about 3K RPM up to 5K+.
This is a stock 1996 4.6 with no modifications. Higher octane gas (89-93) helps somewhat but the noise is still there.
Any ideas what it could be and how to fix it? Is there any way I can check for excessive carbon buildup without tearing down the engine?
Glen "RustyUL" Weldon
94 Thunderbird SC - 5 Speed -- Picture Here
1 of 722 1994 SC 5-speeds made.
Soilid Engine Mounts, B&M Ripper Shifter, Tokico Shocks
95 Thunderbird LX - 4.6