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How to Seafoam an Eighth Gen F150 (1987-1991)

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Old 08-05-2013, 09:19 AM   #61
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I went to Autozone yesterday for some car wax and they were pushing SeaFoam. I declined. I'm not convinced on this stuff.
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Old 06-27-2014, 08:02 AM   #62
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Default 92 f150 5.0 v8 ??

Great info on this, Thanks. I have a 92 F150 5.0 EFI, could I use this same approach? Why or Why Not? Thanks
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Old 06-27-2014, 08:06 AM   #63
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Will this approach work on a 92 F150 5.0 V8 EFI, Why or Why Not? Great info on this. Thanks.
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Old 08-18-2014, 12:45 AM   #64
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My son has a 91 4.9 f150 and it sat for a year. Cylinder #3 is not firing. Getting spark, but mechanic said the fuel injector was clogged. Do you think this may open that up?
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Old 08-20-2014, 09:16 PM   #65
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Default seafoaming

Instead of trying to pour the sea foam into the brake booster line, get a plastic cup and pour 3/4 ounces into it, start truck then place tube into the cup. Vacuum will pull the sea foam into the line
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Old 08-20-2014, 09:18 PM   #66
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This stuff works!!! Had a friend that had a trailblazer that would not idle, put in the sea foam for 30 minutes, started and drove. Smoked like a freight train, but when I got back to the house it idled smooth
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Old 05-08-2015, 09:12 PM   #67
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You guys have to be super careful when adding it until the engine dies. I would not recommend that AT ALL. You run the risk of Hydrolock which is NOT worth it.

The way I did mine; I removed the intake tubes, so I had direct visual access to the butterfly valves. I removed the brake booster vacuum line, and held the seafoam up against the line so that you can see the vacuum pulling out the liquid through the Venturi effect.

I let it lightly draw seafoam at idle, just enough to make the engine stumble. Then, I manually open up the throttle to increase RPM's to roughly 2000, and add lots of seafoam. At this point, the engine won't die because the seafoam is burning too quick to kill it. I would add as much seafoam as I could, and if the engine almost died, I revved it more. The truck blew smoke like a train the whole time. I did this with the entire can, and afterwards, my idle was significantly smoother, and the throttle response was fantastic. IMO a much safer way to clean out the engine.
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