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Seafoam WTF???


phurst

Member
Joined
Apr 2, 2014
Messages
9
Vehicle Year
1987
Transmission
Manual
Hello people! New owner here. I have a post in the introduce yourself section, but I find myself in need of some assistance. The first time of many I imagine.

So, long story short, I scored a free 87 Ranger extended cab on Craigslist yesterday. One of the issues it was having was that it idled unevenly, and often tried to stall, or race in neutral. As part of the "new to me vehicle" process, I wanted to Seafoam the engine. I got the spray, simply because I find it easier to use. I put the spray tube into the throttle body, reconnected the intake, and started the truck. Using the throttle linkage, I revved the engine a little bit and started spraying. I've done this plenty of times before, so I wasn't really paying attention, until about half way through, I noticed the engine note hadn't changed, and there was no smoke coming from the exhaust. I finished up the can and cut the truck off for 5-10 minutes. When I started it back up, it fired right up and ran normally, again, no smoke. I then noticed some fluid dripping out of the air box... Yep, you guessed it, somehow all the Seafoam (or at least the massive majority of it, ended up being sucked down the air return line to what I guess is the IACV, mounted on the side of the air box, connected to the other end of the return tube. So, WTF? Why did that happen? How do I prevent that from happening the next time I try this?

On a side note, I noticed the vac lines for the MAP sensor were completely rotten and cracked. I replaced those, and it's running and idling MUCH better now. I'd still like to Seafoam it though. Advice?
 
A 4-cylinder engine I assume?

Find another way into the intake.
 
Yes, sorry, 2.3 4 cyl. I can go in via the brake booster, but loose the cleaning effect on the throttle body if I do that. I was mostly curious why that happened, if it's normal, and why that air return is even there.
 
Use the brake booster. Then clean the throttle body with throttle body cleaner. Problem solved.

Sent from my XT1058 using Tapatalk
 
Will it run if you block off the air return, then do the seafoam again? Don't know, cause I don't know your 4-banger at all...just an idea.
 
the way I've always done it is the hose for the seafoam goes right to the throttle body, I don't see how possibly it could get to the air box, if you're spraying it onto the throttle body...

the other thing you can try, is just taking the intake tube off, and spraying it like a can of spray paint, at the throttle body... the MAF won't be getting used and will probably trip a code, but chances are it will still run just fine, for what you're doing atleast...

it does have a maf right? if not, just take the tube off for sure!
 
Yes, no MAF. I just did it through the vacuum tree on top of the throttle body. I'll just clean the TB by itself this weekend. It's NASTY in there.
 
New to you go through everything one at a time complete. Give it a tuneup including plug wires. Clean all electrical connectors with elect cleaner and use dielectric to protect from moisture. Replace all the vacuum lines just for giggles. Get a throttle body gasket and just pull the TB and clean it good as well as the IAC. Disconnect the battery at some point to reset the computer. Once you get it all back together run it at medium speeds for at least 20 minutes and then see how well it idles.
Unless you know the history of the vehicle go through everything one at a time oil, brakes, alignment.
 
Also inspect the throttle shaft in the TB for slop. Never reuse the old gasket and gently surface the base with 200 grit on a glass table in a figure eight pattern until it all shines the same. Just get it snug do not overtighten it. After a few good warm up cycles snug it again when cold.
 
Probably the most overlooked part is the PCV change it whenever you change spark plugs and if it has excess blowby put a pcv in for a 302 it is the blowby that is mucking up the TB. Clean the ACT with rubbing alcohol (air charge temp) similar to a MAF.
 

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