Loren huff
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Joined: Oct 2014
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From: Wichita,KS
Loren huff
Ok I need some help. New guy may need patience from ya'll, too. Driving a 2002 f150 5.4 liter, 4 wd. 128k miles. Recently started driving truck after sitting in garage for 12 months. Started getting codes 403,316,171 and 302 Changed plug and coil on cyl 2 for 302& 316Also egr valve, dose removed and cleaned throttle body. Drove 20 miles and all 4 codes came back, really need a starting point and any help would be much appreciated.
Last edited by loren huff; Oct 7, 2014 at 08:57 PM. Reason: Wrong code #'s entered
Lead Driver
Joined: Sep 2006
Posts: 7,907
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Why not take a look at all the code descriptions first to see what you have for issues!.
A run through this;
Code 302 is #2 misfire.
Code 316 is misfire detected on start up.
.
Code 171 is lean bank 1.
.
Code 403 is EGR circuit error.
.
You have 3 different areas responding with codes.
You needed to know this first.
.
First question is has rodents been chewing on the harness at any point?
Second what has been done with the old gas in the tank? The old gas is no good after this long a time..
.
The 316 code will clear when the misfire is cleared.
The 171 code may be blocked injectors from setting so long.
The 403 code may be the DPFE.
Fuel filter needs changing, old gas drained and filled with fresh gas if it has not been done.
You have to look at all these possibilities and sort then out one at a time.
Leaving any vehicle set that long bring problems.
Good luck.
A run through this;
Code 302 is #2 misfire.
Code 316 is misfire detected on start up.
.
Code 171 is lean bank 1.
.
Code 403 is EGR circuit error.
.
You have 3 different areas responding with codes.
You needed to know this first.
.
First question is has rodents been chewing on the harness at any point?
Second what has been done with the old gas in the tank? The old gas is no good after this long a time..
.
The 316 code will clear when the misfire is cleared.
The 171 code may be blocked injectors from setting so long.
The 403 code may be the DPFE.
Fuel filter needs changing, old gas drained and filled with fresh gas if it has not been done.
You have to look at all these possibilities and sort then out one at a time.
Leaving any vehicle set that long bring problems.
Good luck.
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