'02 4.6L shows P0174 code running rough (missing)
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'02 4.6L shows P0174 code running rough (missing)
<TABLE><TBODY><TR><TD vAlign=top width="100%">My '02 4.6 is giving a P0174 code (bank 2 lean)...HISTORY: It all started with it running rough at idle and through acceleration and cruise range and seemed to be worse after a fill-up. When I filled it up with gas this last time, started the truck and it started missing worse afterwards, the service engine light came on. Pulled 1 code (P0308) misfire on #8...replaced plugs and swapped #8 COP with #2 COP and cleared the code. Test drove, still missing (running real rough). Pulled 1 code (P0174) lean on bank 2... the P0308 code is now gone .
My thought is it may be the #8 injector.<O:P< font < O
>
Items Tested:<O:P font <>
Spark firing triggers, power (-/+) and resistance at the COP's are good <?XML:NAMESPACE PREFIX = O /><O:P></O:P>
Cleaned MAF sensor (easy and just for grins)
New air filter (easy and just for grins)
Can't find any vacuum leaks
Any thoughts before replacing the #8 injector (80.00 bucks) or taking it to the dealership...(Big $$$$$$$$)
</TD></TR></TBODY></TABLE></O:P></O:P<>
My thought is it may be the #8 injector.<O:P< font < O
> Items Tested:<O:P font <>
Spark firing triggers, power (-/+) and resistance at the COP's are good <?XML:NAMESPACE PREFIX = O /><O:P></O:P>
Cleaned MAF sensor (easy and just for grins)
New air filter (easy and just for grins)
Can't find any vacuum leaks
Any thoughts before replacing the #8 injector (80.00 bucks) or taking it to the dealership...(Big $$$$$$$$)
</TD></TR></TBODY></TABLE></O:P></O:P<>
New User
Joined: Sep 2007
Posts: 15
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Do you have the factory service manual on CD for 2002?
If so ... The PCM (power train control module) section
contains pinpoint tests for isolating the lean-Bank...
How many miles....
I had this same problem....
But mine is a high mileage engine...
Check you hot o2 sensor (the one closet to the manifold...
You have a code reader can it read PIDs?
If so ... The PCM (power train control module) section
contains pinpoint tests for isolating the lean-Bank...
How many miles....
I had this same problem....
But mine is a high mileage engine...
Check you hot o2 sensor (the one closet to the manifold...
You have a code reader can it read PIDs?
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