I didn't notice any difference.....im going to try again and put the rest of the can in this time. I dont think I put enough in, because for 140k miles, it should have done alot more than that. Its a one owner truck and I think driven by some lady, so that means more than likely it was drove around gently which means carbon build up.

 

I work at a gm dealership and of course bought a 98 ford ranger, I also work in a gm shop.

About a month after i bought my truck the marble knock started knocking, being a perfectionist it really annoyed me so i started trying to find everything it could possibly be. Using alldata which is a site we use to pull up history of particular vehicles and info about them i came across the carbon build up that all data said it should be. And it fit perfectly especially after reading this site. To be honest i was getting scared untill i read this site because of the fact the i ran gm upper engine cleaner through it twice and it did nothing.

I thought about pulling the heads off and cleaning it myself and taking a look at if it was the problem but after reading this site i know this hast to be what it is because the description is exactly what happened to me, marble knock right after and oil change only at low rpms.

Im going to run a quart of transem through it (transmission cleaner) and take out a quart of oil and then put the quart of thransem through it and let it run for five mins then replace oil and oil filter. If transem doesnt do it then the only option is to pull off heads and clean by hand.

Ill reply with how it went soon.

 

I have a 2004 4.0 and i now have a low RPM rattle that sounds like either timing chain rattle or something else. It happened instantly overnight. I am looking for ideas and i am pretty sure its not carbon buildup. Thanks for help

 

Marbles? YES! that's the sound... I purchased a 99 Ford Ranger yesterday morning... had a tiny tap when I test drove it (and I do mean tiny... I might be a woman BUT I use to drive a 1957 Chevy as my daily driver... so I do know a little bit about autos) ... it awful now (I'd say it started about 2 hours after I purchased it). I just KNEW it was out of oil. Nope not out of oil... so I poured a bottle of sea foam in the gas tank today (after reading LOTS in this forum about the sounds the rangers make)... hopefully that will help.

I'll let you know.

 

I ran a can of BG 44k through mine and it made it quieter, but it is still there just very faint.