2002 Ford F150 Ford F-150 Very Rough Idle

2002 FORD F-150

JASON F

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Engine Performance problem
2002 Ford F150 V8 Two Wheel Drive

I have a 2002 Ford F-150 with 106k miles that has a very rough idle. The check engine light came on about 2000 miles ago but the truck has been running perfectly so I didn't do anything about it. Now it has a very rough idle and makes a rattling sound when accelerating. The rough idle shakes the truck it is so bad. Then sometimes it will catch and the idle will rev high then go back down again. Is this an O2 Sensor issue or do I have bigger problems?

Oct 14, 2008 at 1:53 PM

JNOVACK

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go to autozone and have the code in computer read and let me know and I will help you through this thank you

Oct 14, 2008 at 6:30 PM

JASON F

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[quote:f3c6482896="jnovack"]go to autozone and have the code in computer read and let me know and I will help you through this thank you[/quote:f3c6482896]

Thanks! I was planning on doing that tomorrow. Will let you know as soon as I have it done.

Jason

Oct 14, 2008 at 6:47 PM

JASON F

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I went and had the computer read and here are the codes that came up:

P0171
P0174
P0405

I went ahead and bought a MAF sensor because it looks like that is probably the problem but I haven't put it in yet. What do you think?

Thanks a lot,
Jason

Oct 15, 2008 at 6:48 PM

JNOVACK

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P0171 System too Lean (Bank 1)
P0174 System too Lean (Bank 2)
P0405 Exhaust Gas Recirculation Sensor A Circuit Low
with the codes it looks like o2 sensors on both sides and the egr valve

Oct 15, 2008 at 9:49 PM

JASON F

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4 POSTS

So should I scrap the Mass Air Flo sensor and just do the O2 sensors and EGR valve? Thanks a lot for your help.

Oct 15, 2008 at 10:02 PM

JNOVACK

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the codes come up for the O2 sensors and egr I would go with them first

Oct 15, 2008 at 10:12 PM