Ok, so last week i Seafoamed my truck, 1/3 in the break booster line, full can in the gas. After that I changed the pluges to Bosch Platnium +2, changed oil to Mobile 1 Full Syn Truck and SUV and used a Mobile 1 filter.

Before, I was getting about 16.6 mpg average. Now, I'm getting around 14.3 mpg....

What could be the problem? Did I forget to change something? I forgot to add Seafoam the old oil, could that do anything? Any help would be great. Thanks guys.

 

How's your right foot? Are you enjoying the new "peppiness" from de-carboning the enigine? If so, that would be your problem.


After I seafoamed mine, it felt like it had more "get up and go" to it. Then my mileage went down. I stopped and thought about it, and realized I was enjoying the new "get up and go" a little too much. haha

 

............................................^^^Rig ht there's your problem^^^...

 

Are those bad plugs? Didnt want to get the ****ty ones, or the super expensive ones...


I havent knowticed any change at all really. And my foot isnt that heavy.

 

I'm with Shane. Thats also why you haven't noticed any new peppiness. Throw some Motorcraft fine wire platinums in there, and you'll be fine.

 

I have those plugs also. Why are they bad? Detail?

 

ya i put the bosch in my 4 banger all 8 plugs an my mpg went down.....

 

If you guys looked around, theres a million threads on this and why Bosch plugs suck in our truck. Motorcraft should be the only ones used (yea I know theres about 1% on here that actually use bosch and have had zero negative effects).

 

Motorcraft or Autolite....they are virtually the same exact plug. Our trucks call for double platinum for NA engines.

I ran Bosch platinums, ran like junk, next day I put in Autolite Double Plats, ran like a drea.

 

I've got NGK's in mine, and there has been an issue with durability. On one plug I got only like 20,000 km out of it. I thought it was a bad plug so I switched it out. Then it changed and it was the next plug down the line. Both not producing any spark. Both plugs are a nice tan color too, no fouling or anything obvious.

 

Hmm, wow. Never thought that certian plugs wouldnt work, I never thought to check it out.

I guess I'll be switching them out for some either motorcraft or Autolite plugs asap.

Whats the absolute best? Iridium or Platinum?

 

i love autolites
always ran the 104's in my grand prix.

which ones should be run in a 4.0 sohc? just so i know for future reference..

/thread jack :D

 

also future reference dont use a mobil filter. their oil is the shyt but their filters suck. use either OEM or a purlator pure one

 

Yeah Bosch plugs and Ford engines don't get along.

 

Well getting back to the sea foam I put the whole thing in the engine, and haven't had any mpg problems, but I also got a magnum performance module too, had it for a while, but as mentioned before I can tell a difference. oh by the way that madule works great, it is the best $25 I spent. sorry sorta thread jacked

 

Bosch plugs are only good in one place....

Staying on the sales rack.

 

Well this stinks I've been running Platinum +2s for almost a year now. I might need seafoam it earlier than scheduled. Well I'll be switching to motorcraft soon.