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Hey guys, I know we can all use the little bit of extra power or mileage that we can get, and for the cost of around $20 (seafoam only, does not include other supplies) there is really no reason to pass this maintenance tip up. The only things you will need are 2 cans of seafoam (for my Canadian residents, I am told that ONLY napa stores carry this product, if you can confirm another company please let me know), and a funnel that will fit inside your brake booster line (see second picture), you might also want to get some heater hose that will fit into your gas tank filler spout so you don’t spill seafoam on the side of your jeep. (NOTE: This can be done on any vehicle, but for this writeup I am explaining in detail for a fuel injected YJ only).
So, first step is the vacuum line portion, I decided to use the brake booster line as it was the easiest and most convenient. Bring your jeep up to operating temperature (a short drive around the block should do) and park it with the garage door open, or outside. Go ahead and pop the hood, locate the brake booster vacuum line, and pry it off. Now grab your funnel and push it into the hose (the tighter the fit the better, if you can’t afford a funnel, or forgot to buy one, heavy paper will do in a pinch). Open the can of seafoam in preparation and place it somewhere easy to grab (like on the fender), now go ahead and start your vehicle, don’t be alarmed, your RPM’s will travel up dramatically from idle, this is because you have created a vacuum leak. Now go grab your funnel and opened can of seafoam and SLOWLY start to pour the seafoam into the funnel, you will soon find out how fast you can pour the fluid in without choking out the engine, for me, it took about 10 minutes to empty the entire bottle (if you do accidentally choke out the engine, quickly go start the engine back up again, and continue pouring). When you get to the last little sips, pour the remainder of the can down the funnel (this will choke out the engine hopefully and now you can go shut the ignition off, and if it doesn’t, go turn the ignition off quickly). Make sure you go plug the vacuum line back in. Now you have about 10 minutes to waste while you wait for the seafoam to soak in and penetrate, so head on to the next step.
The next step is the easiest, and the quickest. You will only need a half a can of seafoam for this step (approximate is good, but try to be close). I would recommend filling your tank before you pour any seafoam in, don’t fill it to the lip, or you wont have any extra room. If you decided to use heater hose for this, go ahead and put the heater hose down the filler neck, once the hose is in, and facing upright, put the funnel in the heater hose. If you chose not to use the heater hose, just place the funnel in the filler neck (For a YJ, I would recommend you use some heater hose, or you will be pouring at a very weird angle). Now, go ahead and pour about half a can into the gas tank. If you don’t have a full tank of fuel, that should be your first stop after your test drive.
Now, if it has been 10 minutes, do a quick vehicle walk around, make sure you didn’t leave any tools, empty cans, cell phones (doh!) or gas caps laying around. If you are ready to go, close the hood, hop in, and fire it up. You will notice LOTS of smoke from your exhaust pipe, this is a good thing, as the seafoam is working. Go ahead and drive it to a road where you can let your right foot and the gas pedal become “one”. When you have taken about a 10 or 15 minute drive (longer if you are still smoking) either go to the gas station of your choice, or go park it at home if you are already full.
The third and final step I have not completed, because I changed my oil about 500 km before I added the seafoam, and I didn’t want to change the new oil so quick. This step will also use a half a can. Since I have not done it yet on my jeep, I will only do a quick outline. You will pour the remaining half can straight into your oil, and drive around about 50-100 km. After the 50-100 km are on, change your oil, you will notice the oil is very dark and possibly thick, well, it did it’s job.
I havn’t driven long enough, or with fair enough conditions to tell if this helped my mileage or power, but after a quick drive up a hill where I can usually hold 80 km/h, I can still hold 80 km/h, but, with my e-brake on (oops, bye bye e-brake). When I start driving the speed limit and with my hard top on again, and have done the oil step, I will update this post with my findings.
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