Seafoam worked on one car but nothing on other

[trailblazr81]

Well I seafoamed my 70,000 mile 2000 GT. Decent smoke show, seen better ones in videos from here. I also Seafoamed my 85 5.0 with 210,000 miles. All I got was a little puff of smoke when I restarted it. I even went and bought another can since first attempt I just poured it down the carb. Second try I did like on my 00 and sucked it up through the PVC. This thing shoulda smoked out the whole block. I read the instructions... sucked up nearly half the can and turned it off for over 5 minutes and restarted. What gives??

 

[Turbo92PGT]

Thats weird man. I did my old NPI engine and it didnt smoke much. My dads vette smoked HORRIBLE though. And the Ford Probe i had smoked really bad too. I'm going to do my new engine today I think and change the oil with a RESTORE additive lol. Two quarts between changes is too much if u ask me pos

 

[stangGT97]

you may not have left it long enough. I seafoamed my car a week ago and left it for 2 hours. It smoked for about 10 minutes and ran great after

 

[closer9]

I put about a third of a can down the carb of the 390 in my truck, put some in the oil, and the rest in the gas tank. Let it sit for over 20 min, and when I started there was a small puff... and I can't really say it drives any different... I was expecting more...

The truck has either 170K or 270K on it. I really think it's probably 270K...

 

[Marks5.0!]

same thing on my old fox body, 5k on the mach and i plumed the whole street. i guess i got about 6k on the motor in the 93, i got a small puff when it started that was it.