Buallday14

I have a 93 f150 with a 351w. I was driving today and my check engine light came on when I parked and turned off the truck to check the codes I turned the key back to the on position the light was gone and every time I drive it turns back on. But when I restart it it's off. I have absolutely no idea what's going on and it's starting to irritate me so any help would be really appreciated

Just call me Sean

iTrader: (1)

So check the codes dude.

Franchi Motorsports

iTrader: (9)

/\ He about summed it up pretty well.

Buallday14

It's not pulling any codes

fltdriver

Then you aren't doing it right, you would at least get 111 codes

Buallday14

The light won't turn on unless I'm driving it. When I'm stationary the light goes off

fltdriver

Just from personal experience cel comes on after ~5 minutes of driving then dissapears upon restart is usually o2 sensor related, it takes the computer changing cycles (open/closed loop) and three attempts at altering fuel mixture to pop the code.

fltdriver

You can still pull the codes, see the sticky at the top of the forum, grab a short piece of wire or paperclip. connect the upper right corner of the house looking connector to the one holed white connector right next to it in the holder on the drivers side close to the hinge.

Buallday14

Damn forgot about the O2. Thanks bub

fltdriver

you still need to pull the codes, that is only one possibility, though it's probably your problem, you should still pull them to verify!