Hey guys i have a 92 f150 with 175000 miles or so and thought maybe to seafoam the motor. I found a write up on another site but im not sure. The guy says to let the motor stall out and some things that just dont sound right to me. I dont know much about seafoam some like it some swear it kills the motor and causes more probelms. I was wondering what thoughts were and if this sounded like a good route to go?

How to Seafoam an Eighth Gen F150 (1987-1991) - Ford F150 Forum - Community of Ford Truck Fans

 

I've never had a problem with it. I let my vehicles get to operating temperature, then remove a vacuum line and slowly let it get sucked in until the engine runs somewhat rough. I don't stall mine. Shut it off, let it sit 10-15 minutes, start it up and drive it aggressively until it stops smoking. I also remove the air intake tubes and clean the throttle body and plates with some throttle body cleaner. The kits I use at work have a giant cottonball on a piece of wire for cleaning/scrubbing and to reach farther in.

 

But never had any problems or anything break after you have done it? I hear everyone seem to support it but I have a few people that have told me that they have seen motors seize while using it. The main thing i was concerned about was the stalling part to me it seemed like a bad idea to let it stall

 

Ive had good and bad experiences. Made my motor knock realll bad after I did it in my dodge...

good luck!!!

 

I you dump way to much in it cal hydrolock the motor. Pour it in slowly with engine running. I've done it to a couple trucks now no issues

 

did anybody read through that thread the op posted? those people really seemed new to seafoam and trucks in general.

 

i read through it but just felt it was weird to make your motor stall. Seems like it would do more harm then good

 

I have only added it to my fuel system thru the tank. I also run it in my fuel on my motorcycle.

 

I run about 1/3 of the can in the brake booster line, shut it off right away and let it sit 20 min or so then go for a drive

 

it doesnt stall out my truck when i do it through the brake booster, but some other cars i have done it to stalled out really fast. just pour it in slow. if it stalls, it stalls. if not than just turn it off and wait around. sometimes ill leave it in over night and smoke up the street when i leave for work in the morning

 

I've never sea foamed a fomoco engine, but I've done 9 others. All German, but technically similar to ours. Iron i6, 160-200hp, 8.8-10.1 CR, sohc. All made in 80's-90's, so similar injection technology/setup to this. There are two important keys.

What is wrong with your motor that want to sea foam? It's a detergent basically, so it's effective for cleaning buildup. My best use- I had an 89 that was owned by a complete idiot. All city driving, 87 instead of 93 fuel, wrong spark plugs, terrible air/fuel ratio. When I yanked the old plugs they had carbon build-up hanging on them like filings on a magnet. Actually laughable now that I think about it. Did the standard 3 part input and flushed everything after 200mi. Did very well cleaning the injectors, large buildup in the plenum, and piston heads. Smoked for a few miles of driving, after 15 mins of idle smoke
I had a 96 engine that was a complete wuss about van leaks. Ran SF through it because I already had some at the house. Got no smoke out of it. There was basically nothing to burn off, so sea foam was a dud. Turned out to be tons of o-rings and hoses.

Secondly, it's in how you put it in. I've seen a guy that just turned the can upside down in his intake boot. Also had it idling at 2500rpm. Promptly blow a hole in the #3 piston and HL'd 2&4. I usually use the brake booster vac line. Easy to get to and work with, non essential to idle, and pretty even distribution onto the head. Also, the brake line is larger and has a high van on it. So tip the can at ~45 degrees, like you're pouring a beer, and the line will suck it out of the can. Also easiest to put the 1st 1/3 in here because you need a less severe angle. You'll hear the engine start to bog or shake when it's had enough. Just back off for a second, touch the booster hose to it's plug and let everything stabilize. Then go back at it. Probably takes me ~15 min to do it. The crank case I pour into a 5L oil jug, then dump in.

It's like any tool. All in how & why you use it. That's why some people like me are big fans, some people saw no effect, and some go at it like a ham fisted Sasquatch and wreck their motor. If you've got severe buildup it's still worth it to take everything apart. I use it before I crack an engine for a rebuild or head gasket. Knocks down the big stuff. Like sucking dust bunnies from under the couch. If you want to make it look brand new you'll need tiny hands or a removal.

 

Just did mine two days ago. Didn't make any difference in how it runs and certainly didn't cure my mystery Miss. It was fun though. Couldnt stall out my 300-6 either. Goes to show how unstoppable that motor is.

 

Well due to me being a new owner of this truck and the miles on it and the PO died and it was turned over to his grandson who let it sit for about a year or so. I have no idea how the truck was maintained or anything really about it. The grandson i bought it off of told me he did a tune up on it before he sold it but that was a year to year and a half ago. I found a few things that need to be repaired so I figured while im at it seafoaming the motor might be a good idea and i like to do my own work on my vehicales so I will probbly go through it all but a good internal clean might be great for it..At least thats my thinking

 

I used Seafoam all the time. Never had any issues with it.

 

Could anyone tell how to identify the brake booster vacuum line, I just don't want to unplug the wrong hose.