I have a 2000 f-150 with 4.10 gears,magnaflow siso exhaust,k/n cai,and xcal with troyer tunes running 93 perfomance tune.I have 90,000 miles on the truck still running original plugs,and o2 sensors. the truck runs fantastic ,but i notice a rich exhaust smell, gas mileage sucks[what f-150's doesn't] my question is ,would changing the o2 sensors help or may it be in the program ?I never dyno'ed it after i installed the x-cal. Any help would be greatly appreciated . thanks

 

Does it do anyting else then run a little rich. By the way how do you like the 4:10 over the 3:55 or do you have them because of a lift. I plan on getting them sometime in the future but I am not lifting my tuck.

 

One of the most important issues involved with tuning these trucks is that you have "good" O2 sensors. Mike has said this time and time again and it is all over the threads in this forum....Change them...

 

I love them! 2nd best mod. after the x-cal! Still running stock 265/70/17's,But be carefull, I have a stick and with that extra torque to the ground, while pulling a holeshot i busted the stock ford posi. right in halve!!!!! lol.That was a 800.00 burnout!!!???? But do you and your truck a favor and put the 4.10's in.

 

I will heed the advice of the F-150 master.Thanks for the input.

 

When I do 4:10 I will do an eaton posi.

 

I recently put 4.10s in mine, and I love it. Its amazing how much quicker it is. My city mpg went from 12 to 14, and my highway went from 15 to 16.5 on a 325 mile trip.

 

i am running the same tune only with 24# injectors and Mike Troyer recomended new upstream 02 censors due to the mileage, so I am gonna be changing mine in the morning and I will report back asap, lol

 

I can't believe no-one has mentioned to change the plugs also! When the o2 sensors go bad they will richen up the mix which will leave large carbon deposits on the plugs and start a fouling process to begin.@ 90,000 you need a tune up period,check the cats for oversaturation also.

 

Point taken. Gonna put some MOTORCRAFT plugs in,Do you think i could use the BORG-WARNER o2 sensors from GLOBAL AUTOMOTIVE on E-BAY for 19.95 ea. or BOSCH for 54.95 at the part's store?

 

You get what you pay for.....Get the Bosch !!!!

 

Hi Guys,

First, with EFI engines you *cannot* determines what the A/F ratios are by any way other than testing them on a wideband A/F ratio gauge/recorder - period.

You cannot do this based on smell, you cannot do this based on the appearance of "soot" in the tailpipes, etc - that only works on older carbureted engines, not on modern EFI engines running unleaded fuel.

Now on a vehicle with 90K miles, the spark plugs and the upstream O2 sensors should have been changed LONG ago - there is NO spark plug in the world that has any business being in an engine for more than about 30K miles no matter who says what, and the upstream O2 sensors are actually a 30K mile maintenance item - though you can push them to 50K miles in some cases.

To get the best results, have fresh plugs, O2 sensors, a clean EGR tract, a fresh fuel filter, etc - all the things that we used to have to maintain on carbureted engines still need to be done on EFI motors, only now we have more things in some areas (like O2 sensors) that need to be changed - luckily, we no longer have points & a condenser to change every 10K miles, but we still have to do maintenance at a far higher level and to more things than the factory manuals tel you if you want the vehicle to run it's best.

And one last reminder - again - please do not attempt to judge whether your engine is running rich or lean without actually monitoring the fuel trims in closed loop *and* having the A/F ratios @ WOT tested on a dyno or with one of the low cost wideband A/F ratio recorders, like the LM-1 we carry, for example - it just doesn't work by the old methods of smell & exhaust appearance. We see vehicles all the time that the owners swear are running rich but are in fact dead on, or even a bit lean, for example - just FYI.

I hope that helps a bit!

 

new plugs and new upstream o2 sensors, and afox a leaky injector no fuel smell now