Hey everyone Im 17 and currently driveing a 1990 f-250 4x4 untl I can get my 66 mustang restored. Im goin to be doin a tune up on it here in a few days and was curious if anyone had any suggestions? Heres what I have so far.

Spark plugs
Plug wires
Oil and filter already done
Air and fuel filter done
Fuel injection cleaner added to gas
o2 sensor

Any suggestions would be greatly appreciated Thanks Josh

 

You've got most of your bases covered. I'd just add a distributor cap and rotor to your list.

 

*Clean the throttle bodies with "throttle body" cleaner (makes big difference)
*Make sure the TB blades open all the way at WOT
*Clean the MAF sensor (if applicable) with "MAF sensor cleaner"
*Set the ignition timing (could advance it slightly)
*Seafoam treatment

What engine is in your truck?

 

X2 on the Seafoam. Introduce the Seafoam through the vacuum line leading to the brake booster. It will smoke alot...I just did it to my Explorer and the neighbors 3 streets up the hill called the FD thinking there was a fire.

After the first treatment, give it a day or two and do it again. It will smoke less and less each treatment you do.

 

blkfordsedan- it has a 5L 302 in it

jplinville-How would I introduce it to the vacumn line? would it be ok to uhook to put it in? What exactly does the seafoam treatment do?? I have honestly never heard of it before.

Also I know alot of mechanical stuff about cars and how it works but some of the electronics Im not sure about nor do I know much about them. So sorry If ya have to go a lil in depth.

Thanks again!!!
Josh

 

the big vacuum line that goes to the brake boostr remove the camp an pull the fitting out of the end and pour some in. i only ever did 1/2-3/4cup of the seafoam, re assemble the booster and fire it up. you can ad some to your fuel and then giv it a week and use the rest in the booster vacuum line again.

they say that before an oil change replace 1L of oil with atf for a day or two to clean alot of the crap out of the bottom end of the motor that the seafoam cant get to.

 

Sorry if it sounds retarted but wuld I pour it in with the engine running so there will be a vacuum on the line?

And also would I need the MAF sensor cleaner and throttle body cleaner or would wd-40 or carb cleaner work?

Thanks Josh

 

You're supposed to put the vacuum hose in the bottle while the engine is running so that it distributes it to all cylinders. If you do it with it off...what are you really accomplishing? You're also supposed to let it suck it up til the truck stalls but I've never been able to get my truck to stall lol. Shut it off, wait 15-30 minutes, start it up.

 

Yes, you'll use the engine's vacuum to pull the Seafoam into the intake.

Your '90 shouldn't have a MAF, so you can skip that. I'd use throttle body cleaner on the throttle body, but carb cleaner would likely be fine to use as well.

 

Yes, you'll use the engine's vacuum to pull the Seafoam into the intake.

Your '90 shouldn't have a MAF, so you can skip that. I'd use throttle body cleaner on the throttle body, but carb cleaner would likely be fine to use as well.

 

Do a search on the "sixlitre tune up", that should help you.

 

Idid the search and im already doin that on my 66 mustang but i didnt even think about the truck lol and im definetly doin the seafoam idea cause im thinking my engine has alot of sludge build up! thanks Josh

 

Seafoam is a product you can buy next to the fuel additives at Autozone and places like it.

Pour about 1/3 of the bottle in a cup you are willing to throw away...something disposable.

Start engine and let it come up to operating temperature.

Remove the 3/4"-ish diameter hose from the brake booster, it should have a squeeze style clamp.

The engine will sound rough at this point.

Stick the end of the hose into the cup and allow it to suck up all of the Seafoam.

The engine should stall out at this point...that's what it's supposed to do.

Replace hose and clamp and let it set for 3-5 minutes.

Restart engine and look for the smoke cloud...it should be large enough to register on the local weather radar.

I would do this treatment more than once...2-3 times at first should do the trick. What it does is clean the carbon deposits from the intake system. Carbon will slow the flow within the engine, robbing you of a smooth running engine and horsepower.

I did this to a used Explorer last week that I recently bought. The smoke was so bad initially that one of my neighbors about three streets up the hill thought it was a fire, and called the fire department. After my 3rd treatment, the smoke lessened quite a bit and the engine now runs like it should. The people i bought it from were amazed when I showed them how well I got it running...they sold it because it still ran rough after a complete tune-up.

The bottle of Seafoam should be right around $10. I use it in all of my vehicles including my Audi and Mercedes.

You can also use it in your fuel tank to clean the injectors, and crankcase to clean the oiled parts...

I personally don't use it in the crankcase because it could clean the deposits so well that oil leaks could develop at the gasket lines.

 

Thanks for the step by step! I am definetly goin to try this soon!

 

Not problem.

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