kwoodburn

Has anyone put a cold air intake on a 2003 f-150 (5.4V8) and then after about a day or two the check engine light comes on, cause this is what happened to me on my 2003 F-150 Super Crew 4X4. So i removed it and never had a problem since.
Any suggestions??
Let me know. I would really like to put another cold air intake back on.

Thanks, Kurt

NGM

I didn't think they caused problems with the 03's. What code came up?

kwoodburn

The code i got was that it is running rich....Do you think it could be a faulty O2 sensor??

NGM

Have to test it and see. Just because its running rich dosent mean the o2 is bad. The maf could be bad, there could be a small vaccum leak not allowing the fuel pressure regulator to do what its supposed to do.. Too many ppl immedietly assume oxygen sensor.

dewman

If anything, I would have thought it would cause it to run "lean" with the increased air intake.

Fred Kuhmann

i have a 2003 F150 also and my light came on and i had it looked at and fixed but around the same time a backpreasure sound or a gurgle started. it really does it when i take my foot off the gas. cant figure it out if any one has a suggestion. thanx

torkum

What brand CAI do you have?

jacobs4x4

I have one on a 97' V8 and have never had a problem

98triton

same with me, my check engine light came on and the code said system too lean

transmaster

If you purhased one of the cold air intakes that uses an oil impregnated filter such as a K&N if there is to much oil on the filter it will be sucked into to the intake and coat your MAS heated sensor element causing the rich mixer error. The fix is to hose down the MAS to clean to oil off of it, then clean and oil the filter being very careful you put exactly the right amount of oil on the filter.