Rough Idle help?
Hi guys, I'm new this forum and I need some help.
I have an '05 F-150 FX4 5.4L with 48K miles. It was idling rough so I took it in for a tune up (I wasn't attempting those plugs after all the horror stories). After a $500 tune up with 2 new fuel injectors it is still idling rough and the mechanic says if it isn't throwing a code there is nothing he can do. He said coil packs are good. IAC valve maybe, but is there anyway to know for sure without buying the $60 part and swapping it out? Any ideas? |
with the engine running wigle some wirers under the hood maybe the mas air flow sensor wirers, maybe o2 censor did they hook it up to a diagnostic machine? maybee the service engin soon light that tells you a code is being spit out is out just some ideas off the top of my head
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Be sure to check for vacuum leaks. A quick shot of carb cleaner into the engine compartment will tell you if you've got one.
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if you have underdrive pulleys and have not set your idle higher that would do it
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The injectors on 05 5.4's are under extended warranty - you may still have some leakers.
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