P0301, P0302, P0303, P0172 and P0174 codes.

David704 · 03-02-2011, 09:25 PM

Hey Folks
I need some help. 2000 Explorer 4.0 s.o.h.c. I have codes 300 multi cylinder. 301,302,303 p0172 and p0174. I have changed the upper and lower intake gaskets. I have replaced the all 4 O2 sensors and fuel filter and checked pressure while driving stays around 65. Engine runs rough and check engine light flashes. If someone could offer any information I would be forever grateful.

Thanks
Dave

*boominXplorer* · 03-02-2011, 09:40 PM

Timing chain guides are gone and letting the chain slack causing missfires. You also can only get to the front one with the engine in the truck. To replace the rear chain guides you must pull the engine .

*lynchy wa* · 03-02-2011, 09:41 PM

G'day Dave, the only thing I can think of, (which isn't saying much) is cleaning the MAF sensor and throttle body (use the dedicated cleaner for each if you try this). You could also try searching for the problem's you're having in the search bar at the top of the page. Hope this help's.

Well Boomin know's, so disregard my bull s*** but welcome

**BrooklynBay** · 03-02-2011, 11:05 PM

Welcome to this forum! I've renamed your thread, and moved it into the EEC-V section.

swetrid · 03-03-2011, 05:38 AM

Sounds like it jumped time

*2000StreetRod* · 03-03-2011, 06:04 AM

Misfire sources are: ignition, air/fuel ratio, compression. Your misfire codes are just for the cylinders in bank 1 (passenger side).

P0172 indicates bank 1 is too rich while P0174 indicates bank 2 is too lean. Make sure that your pre-cat O2 sensors for bank 1 and 2 are not cross connected (left sensor going to right PCM input, right sensor going to left PCM input).

I suggest that you perform a compression check to eliminate the right timing chain as a possible source of the misfires.

NJFord · 01-10-2012, 09:35 AM

Ever resolve this? Having the same exact issue.... Cleared the 0171 and 0174 with a new PCV line but still getting the 030x's and a nice tapping

UPDATE: Pulled timing cover and passanger side tensioner/guide on my Crank to Jackshaft chain was wasted. Ordered a new one at dealer and hoping to put in tmrw. It appears from reading ALL OVER this site that P0300,1,2,3s are a result of timing chain issues be it a bad cassett, guide or tensioner. Look around if your having this issue. There are some awesome guides with pics to walk you through the job.

03-02-2011, 09:25 PM	#1
David704 Wannabe Elite Explorer stewd100@aol.com stewd100@aol.com Join Date: Mar 2011 Posts: 1 Vehicle Specs (Original Poster)	P0301, P0302, P0303, P0172 and P0174 codes. Hey Folks I need some help. 2000 Explorer 4.0 s.o.h.c. I have codes 300 multi cylinder. 301,302,303 p0172 and p0174. I have changed the upper and lower intake gaskets. I have replaced the all 4 O2 sensors and fuel filter and checked pressure while driving stays around 65. Engine runs rough and check engine light flashes. If someone could offer any information I would be forever grateful. Thanks Dave

03-02-2011, 09:40 PM	#2
boominXplorer Elite Explorer Virginia Beach, Va 00 4x4 Mounty Join Date: Sep 2002 Posts: 6,029 Vehicle Specs	Timing chain guides are gone and letting the chain slack causing missfires. You also can only get to the front one with the engine in the truck. To replace the rear chain guides you must pull the engine . __________________ 1998 Mountaineer 5.0 2wd - Mac intake, Ported intake, FMS headers, 3" Exhaust, E-fan, SCT tuned, Baumenn Shift Kit, MSD, 4.10 l/s, Lowered 3/2 on 18x9 Cobra r's, HID's 2002 F250 Crew Cab SB 7.3 Diesel 4x4 - 4" MBRP exhaust, AIH delete, SCT Livewire 2001 Ranger ext cab 4x4 - 5.0/4r70/4406 swap in progress (2) 97 Mountaineers for parts 98 Sport for Parts My eBay auctions

03-02-2011, 09:41 PM	#3
lynchy wa Down Under Beer Explorer Albany, Western Australia 2004 XLT V6 4x4 Join Date: Sep 2009 Posts: 5,347 Vehicle Specs	G'day Dave, the only thing I can think of, (which isn't saying much) is cleaning the MAF sensor and throttle body (use the dedicated cleaner for each if you try this). You could also try searching for the problem's you're having in the search bar at the top of the page. Hope this help's. Well Boomin know's, so disregard my bull s*** but welcome __________________ Me-Greg Lynch,Henson Performance,half hornet scoop,blue cobra stripes,Irvin bullbar,red heeler alarm(my dog),K&N,skid plate 2 1/2" exhaust,265/70/17 AT's,1.25" wheel spacers front,1" wheel spacers rear,CB+dual whips/1981 FLH Heritage Edition-Pamela My wagon Uma

03-02-2011, 11:05 PM	#4
BrooklynBay Aerostar Forum Moderator Brooklyn, NY 88 89 93 95 96 Aerostars Join Date: Nov 2005 Posts: 45,687 Vehicle Specs	Welcome to this forum! I've renamed your thread, and moved it into the EEC-V section. __________________ My list of useful threads. My photo gallery. My product reviews. My list of items for sale. Aerostar owners thread. Aerostar parts work in Explorers, Rangers, and Bronco II thread. History of the Aerostar thread. Aerostar Forum. New Members Forum. Ford/Lincoln/Mercury Forum.

03-03-2011, 05:38 AM	#5
swetrid Wannabe Elite Explorer Reading Pa 2001 Eddie Bauer Join Date: Sep 2010 Posts: 1,883 Vehicle Specs	Sounds like it jumped time __________________ Resident Ford Tech for the last 17 years, 2001 Eddie Bauer 5.0L, Cherry Bomb Cat back, 2010 Ecoboost Flex

03-03-2011, 06:04 AM	#6
2000StreetRod Elite Explorer Greenville, SC 2000 Sport SOHC 2WD Join Date: May 2009 Posts: 5,575 Vehicle Specs	compression check Misfire sources are: ignition, air/fuel ratio, compression. Your misfire codes are just for the cylinders in bank 1 (passenger side). P0172 indicates bank 1 is too rich while P0174 indicates bank 2 is too lean. Make sure that your pre-cat O2 sensors for bank 1 and 2 are not cross connected (left sensor going to right PCM input, right sensor going to left PCM input). I suggest that you perform a compression check to eliminate the right timing chain as a possible source of the misfires. __________________ My Helpful Threads, Registry, 16.4/23 mpg, 3900 lbs, 5R55E, 3.73:1, 175 rwhp, Henson custom tune, CAI, Spectre air filter, Lightning 90mm MAF, 75mm throttle body, A/F ratio meter, synthetic oils, Accusump, 2 row radiator, 3+1 leaf springs, .75 inch drop, Edelbrock IAS lowering shocks, engine oil & ATF temp gauge & remote filters & coolers, remote crank

01-10-2012, 09:35 AM	#7
NJFord Wannabe Elite Explorer NJ 2003 Sport Trac Join Date: Jan 2010 Posts: 12 Vehicle Specs	Ever resolve this? Having the same exact issue.... Cleared the 0171 and 0174 with a new PCV line but still getting the 030x's and a nice tapping UPDATE: Pulled timing cover and passanger side tensioner/guide on my Crank to Jackshaft chain was wasted. Ordered a new one at dealer and hoping to put in tmrw. It appears from reading ALL OVER this site that P0300,1,2,3s are a result of timing chain issues be it a bad cassett, guide or tensioner. Look around if your having this issue. There are some awesome guides with pics to walk you through the job. Last edited by NJFord; 01-18-2012 at 12:42 PM.