rusty84f-150

i have a 94 l6 5 speed 4x4. im getting around 12 mpgs. after i took the cats out i was getting 16 mpgs. now its back down. i replaced cap, rotor, fuel filter already. i dont know what else to do. the only things left that could be changed plugs,wires but they look new. o2 sensor,or the injectors too. im fed up with getting suck bad mileage and to the point to where i wanna sell it and get some thing newer but this is what im stuck with. so please i need help any ideas are appreciated.

sylver91

Is the CEL on? Are the plugs gapped correctly? Is it 4x4 and do you drive with the hubs locked? Tires good pressure? Try a better air filter? Drive the speed limit? Change oil to synthetics. Also a timing bump does wonders.

All this minor stuff adds up fast.

rusty84f-150

No cel. Tires at good pressure. I want to advance the timing but I can't seem to find the mark on the balancer. Hubs aren't frozen either.

sylver91

Use some sandpaper or a wire wheel on the balancer and they will show up. Remember to pull the SPOUT before adjusting the timing.

rusty84f-150

Does it look like the first pic but with a single line
And I use the timing marks on drivers side of the engine to set the timing right?

rikard

The computer can store codes even if the CEL isn't on.
Since your gas mileage increased when you pulled the cats they must have been clogged. Pull the plugs and check the resistance on the wires. Replace the plugs with a Motorcraft or Autolite copper core plugs.
Regards
rikard

rusty84f-150

Thanks for the reply. I gotta find my self a some what nice day.

bkbroila

Also have a I6 300 with poor mileage. It's winter, so hubs are locked in but tire pressure is right, plugs, wires, cap, rotor, fuel filter and thermostat were just changed. I don't drive it aggressively, just to work n back. I need suggestions with this issue also!

87f-150

Whats your timing set on 10' i moved mine up to 14' and it helped 1.5 mpg

87f-150

Also a k n airfilter will help it to.