yes i have a 93 f150 4x4 with the 5.8l and a4od. i was left the house yesterday and got to a redlight and it just died. got it started back after about 10 min, drove it for a lil while and then went home and changed the spark plugs with motorcraft plugs. drove it about a mile down the road and then boom check engine light. pulled the codes and this is what i got.
code 21, 26, 33, 42, 28 and 63. i was just wondering what these codes mean and what the problem could be. the truck cranks up and runs and drives just fine

 

21 and 26 are because the truck was not warm enough when you checked the codes. 33 = 23 orc Throttle Position (TP) sensor out of Self-Test rang, Change the TPS.
42 = 42 r HEGO sensor circuit indicates system ric, NO clue what to do.
28 = Nothing there is no code 28.
63 = 63 oc TP circuit below minimum voltage, Check the wiring to the TPS. DO this before changing the TPS and it may solve the problem.

 

for 42, check your O2 sensor. How many miles does it have on it?

 

the truck has 265k miles on it. but i think i may have found the problem. the vacuum line for the egr position sensor was broken, fixed it and no more codes. do you think i still need to check the tps tho? it was replaced about ten thousand miles ago.

 

How does the truck run?

 

runs fine, other than the fact that i have lost probably a good 2 to 3 mpg, sfter new plugs..

 

Did you use Autolite or Motorcraft plugs? Did you use platinums and not copper cores?

 

motorcraft platnium, it had autolites in it before. would that vacuum line to the egr cause that much of a problem?

 

Yes, and get rid of the platinums. They are hype and no results. Go to a copper core plug and you will get your mileage back.

 

ok sounds like a good plan to me. on the vacuum line, do you think it would work to just use universal vacuum line from advance and just put it in between the two broken pieces or should i just order it and replace the whole line?