P0300,304,306 and P0171 and P0174 Code 1999 ford f150

jfdewalt · **Joined:** Sun Oct 21, 2007 6:08 pm **Posts:** 13

I have a problem here, i have a 1999 ford f 150 4.2l. I've been having problems with Po171 and po174, system to lean in bank 1 and 2. I've done alotof stuff, feul pump, fuel filter, fuel injector assembly kit,injector oil rings and intake gasket. and theres no leaks. I just had the fuel injector flush to see if that works. But after they did that they checked the codes before they earsed them and there was 3 more codes that have never been there before. P0300,P0304 and P0306 ( cyclinder misfire)Whats going on.

Sponsored Links · **Joined:** 29 Jun 2004 08:12 pm **Posts:** N/A

allen5795 · **Joined:** Sat Feb 16, 2008 4:31 pm **Posts:** 8

find a line in to the egr ex tub
find a way to open the egr a little
and put some carbon cleaner in it the egr tub
is stuck

jeff compton · **Posted:** Wed Feb 27, 2008 4:54 pm

HuH? Allen what are you talking about? jfdewalt has anyone checked or changed the MAF yet?
Are you sure the intake still doesn't have a vaccum leak? I'd be hard pressed to believe carbon in a tube is causing that many dtcs on that truck!

jfdewalt · **Joined:** Sun Oct 21, 2007 6:08 pm **Posts:** 13

I have a new MAF sensor and the shopsays there no air leak but i'mgoing to bring it to other shop.

louiesy1988 · **Joined:** Thu Feb 28, 2008 5:16 pm **Posts:** 4

i have this kind of problem before with my 2001 Ford Expedition the dealer want to charge me $250 just to correct the problem, already told them about the code(the misfiring of cylinder). i went home borrowed my friend pocket scan OBD II (in which i have my own now. anyway try to check the boot of your sparkplug there might be some electricity from the sparkplug that is leaking that's what i found out on mine. and don't get to the dealer it will cost you a lot$99.00 for one piece at Autozone it only cost me $9.50/a piece....good luck :wink:

let me know if you corrected your problem

louiesy1988 · **Joined:** Thu Feb 28, 2008 5:16 pm **Posts:** 4

to : jfdewalt >>>> if you are using a KN&N filter take it out and clean it again and DO NOT use too much oil..it might correct it.

jeff compton · **Posted:** Thu Feb 28, 2008 9:34 pm

causing the lean codes though?

louiesy1988 · **Joined:** Thu Feb 28, 2008 5:16 pm **Posts:** 4

exactly..because there is no enough air going thru the filter..as far as i know it's like that casue i clean mine and never got the lean code anymore.

jfdewalt · **Joined:** Sun Oct 21, 2007 6:08 pm **Posts:** 13

I dont have a K&N air filter

jeff compton · **Posted:** Sat Mar 01, 2008 9:10 am

I think the timing is out on the camshaft on that side of the engine!

allen5795 · **Joined:** Sat Feb 16, 2008 4:31 pm **Posts:** 8

thats was a wiring probulem on the f150 and 100 cars ago and the randum misfire is a tricky one p0300 to day i was working on a e150 van and found a vac leak bottom intake

louiesy1988 · **Joined:** Thu Feb 28, 2008 5:16 pm **Posts:** 4

if you're talking about 304 check it's boot for the spark plugs i have that problem before they is a leaking electric current going to the plug...but if it is 171 my remedy on that one change your air filter or if you have a K&N clean it...because on PO 171 the air is too lean

P0300,304,306 and P0171 and P0174 Code 1999 ford f150

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