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P0300,304,306 and P0171 and P0174 Code 1999 ford f150
http://www.obd-codes.com/forums/viewtopic.php?f=1&t=2991		 Page 1 of 1
Author:  jfdewalt [ Tue Dec 11, 2007 8:07 pm ]
Post subject:  P0300,304,306 and P0171 and P0174 Code 1999 ford f150
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. :?
Author:  allen5795 [ Wed Feb 27, 2008 4:47 pm ]
Post subject:  Re: P0300,304,306 and P0171 and P0174 Code 1999 ford f150
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
Author:  jeff compton [ Wed Feb 27, 2008 4:54 pm ]
Post subject:  Re: P0300,304,306 and P0171 and P0174 Code 1999 ford f150
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!
Author:  jfdewalt [ Wed Feb 27, 2008 8:57 pm ]
Post subject:  Re: P0300,304,306 and P0171 and P0174 Code 1999 ford f150
I have a new MAF sensor and the shopsays there no air leak but i'mgoing to bring it to other shop.
Author:  louiesy1988 [ Thu Feb 28, 2008 5:22 pm ]
Post subject:  Re: P0300,304,306 and P0171 and P0174 Code 1999 ford f150
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
Author:  louiesy1988 [ Thu Feb 28, 2008 5:24 pm ]
Post subject:  Re: P0300,304,306 and P0171 and P0174 Code 1999 ford f150
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.
Author:  jeff compton [ Thu Feb 28, 2008 9:34 pm ]
Post subject:  Re: P0300,304,306 and P0171 and P0174 Code 1999 ford f150
causing the lean codes though?
Author:  louiesy1988 [ Thu Feb 28, 2008 10:39 pm ]
Post subject:  Re: P0300,304,306 and P0171 and P0174 Code 1999 ford f150
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.
Author:  jfdewalt [ Fri Feb 29, 2008 10:21 pm ]
Post subject:  Re: P0300,304,306 and P0171 and P0174 Code 1999 ford f150
I dont have a K&N air filter
Author:  jeff compton [ Sat Mar 01, 2008 9:10 am ]
Post subject:  Re: P0300,304,306 and P0171 and P0174 Code 1999 ford f150
I think the timing is out on the camshaft on that side of the engine!
Author:  allen5795 [ Wed Mar 12, 2008 5:54 pm ]
Post subject:  Re: P0300,304,306 and P0171 and P0174 Code 1999 ford f150
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
Author:  louiesy1988 [ Wed Mar 12, 2008 6:42 pm ]
Post subject:  Re: P0300,304,306 and P0171 and P0174 Code 1999 ford f150
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
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