I have a 1994 F150 2wd with a 5.0 302 and 101,000 miles. Just put cap,rotor,plugs,wires,fuel filter,and ran 93oct gas and seafoam through it.The truck will start easy 1st thing in the morning(sitting for a few hours) and anywhere from being just shut off up to 4 or 5 min after. But if it sits for 10 min or more the truck will turn over but takes a while to start(turning the key 3 times at about 4 seconds per turn). Truck runs perfect when started.The starter works perfect as well.I don't have any more ideas?

 

How was the Seafoam introduced to the engine? Was this occurring before you did the tune up? ? Do you know what your base timing is? Plug & gap? I would loose the 93 octane. It has the least overall combustive properties of the normally available octanes. If ethanol is involved, your really pooched. If your engine is stock & your owners manual says 87 octane, that's what it was mechanically engineered to digest. My 302 w/ sidegap plugs, gapped at .056 (60K volt HV coil) won't even start w /93 octane! 91 pisses it off, now that I think about it. But it loves 87. I don't think I've seen 93 octane in california, not at a gas station! Right now your loading up your combustion chambers and you will eventually start pinging from incomplete detonation! Not to mention your MPG isn't going to be that great. Octane does not enhance volatility, it controls by modifying detonation characteristics. For engines w/ stock rate of compression, higher octane becomes a Toxic overdose.

 

It was doing this before i did the tune up. I ran the sea foam through the gas in both tanks. I got 2 mpg better on the 93 and the truck ran even smother. But i only ran about 4 gal of it in the truck.

 

As far as removing combustion chamber residue, introducing thru the brake power booster Vac hose as directed is the method of choice. Put some 87 octane in the gas tank and see if the hard starting problem disappears. If it doesn't, we'll take another approach. Base timeing, Plug used & gap? They sell 93 octane where you live? Is it ethanol spiked?

 

sounds like either the coil is weak or the ignition module....I would bet on the coil...it is probably getting saturated/worn

coils should be replaced every 50,000 miles

 

Was it the tune up, the 93 octane or could it be the Seafoam added to the gas that increased MPG? What MPG are you getting?

 

The coil is a great candidate. Especially since he was having this problem prior to the tune up. Do you think 87 octane would improve startability especially if it's in a declining condition?

 

I have ran the truck about 800 miles after putting the 93 in it so that is long gone. I live in Florida and 93 is at every station. All gas here is allowed to have up to 10% eth in it. The better mpg came from the gas cause i did the tune,gas, and seafoam all seperate.Im getting around 18 mpg mixed city and highway(less then 60) But idk what i gapped the plugs at now but it was the factory gap and motorcraft plugs.Idk what the base timing is. Also remember that is does this only when warm(cold and hot it starts like a champ)

 

So you are runnig 87 now?

 

Yes. I have always ran 87 as long as i had the truck but i ran the 93 for only 4 0r 5 gal.