Changed from Bosch+2 spark plugs to OEM Champions. Lost 1 to 1.5 mpg, gapped @ .040, thoughts anyone? Didn't think I would lose mileage, from 13-14 to 12. Change the gap? Thoughts everyone?

Thanks.

 

have you been using 4x4 lately?

 

Nope, no use of 4x4.

 

i assume with the 97 you just used the odometer not the overhead computer like the later gens have? switch back if you are getting worse mpg.

 

Well one thing to try is switch the plugs back and see if it goes back up

 

I use the overhead and figure the mileage myself on every tank. Thought about changing back. Do you think the new anti seize on the plugs could be causing a bad ground?

 

"Bosch+2" are platinum plugs, right? They advertise better gas mileage:

So maybe you proved their claim correct.

The idea, if I remember correctly, is that platinum plugs require less arc-over voltage to fire than conventional plugs, so they end up firing a higher percentage of the time in a relatively weak (i.e., stock) ignition system, which will increase power and fuel economy a bit.

For example, in a stock ignition system, a conventional set of plugs may fire an average of 80% of the time. With plugs that require less arc-over voltage, they may fire an average of 85% of the time in the same ignition system. However, with a stronger ignition system, you might be able to get conventional plugs to fire an average of 90% of the time, which would be better than the platinum plugs in the weaker ignition system.

Don't quote me on any of that. It is just based on what I vaguely remember reading in a Mopar Action magazine some 15 years ago.

 

Interesting MaxinRecoil. They are platnium, but everyone was saying how the Daks don't like them, I thought maybe that was part of my mpg problem. So far apparently not. Will keep the Champions in for a while and see what happens.

Thanks everyone.

 

I know I tried several plugs before deceiding what i was going to run in my truck on a constant the bosch++2 being one of them and I got worse gas mileage than i did with the autolite 3923's.

 

Metalsrfr what plugs are you running now?