Cylinder 5 misfire / System Too Lean?

mmccurley · 06-25-2010, 03:52 PM

2006 Explorer Eddie Bauer 4.6L V8 automatic

Hello, this is my first post. I hope I'm doing this right. I apologize if I'm not and I will work on learning the site better for future post. I looked through the site for the issue I am having and I could not find what I was looking for.

The issue that I'm having is that my 2006 Explorer Eddie Bauer is running rough. I am getting the engine light coming on and it flashes. When this happens the AC cuts out (too hot these days for that to happen)...I read in the manual that this probrably would happen to keep the engine temperature down.

I have a code reader and it is telling me:

-System Too Lean Bank 2

-Cylinder 5 Misfire Detected

and occasionally it gives the code:

-Random/Multiple Cylinder Misfire

Everything I have tried has not changed any of the codes

What I have done:

-replaced all spark plugs with Ford Dealership plugs ($20 apeice - wow)

-changed the coil pack on the #5 cylinder with a new one.

Any suggestions?

cwescapexlt4x4 · 06-29-2010, 08:49 AM

While at the dealer, did you have them run a diagnostics on the engine?

lindapooh6400 · 01-13-2011, 08:47 PM

i am having the same problem with mine on cylinder 5 i have not yet found the problem but have you looked at crankshaft sensor or looked for a bad wire in the harness around the a/c,

superinstaller · 01-17-2011, 02:39 PM

Start swaping them coils around.

thebrakeman · 01-18-2011, 12:41 PM

That's what I've heard is the best way to see if it's a coil problem. If you swap coils #5 and #6 (for example), then the code-readers says #6 misfire, you know that coil is bad. If it stays at #5 misfire, the coil is good, and the problem is something else.

pickupman6 · 01-18-2011, 12:54 PM

im not too familiar with the 4.6 but if cyl 5 is on bank 2 i would swap fuel injectors around like u would with the coil. if your #5 injector isnt puttin out enough gas then that bank wil get a lean reading from the o2 sensor and u will get a misfire.

jimmyboy · 02-28-2011, 10:41 PM

It sounds like a coil. I had 14 coils go bad on my F150 with a 4.6 over a 7 year timeframe. I finally started buying them from Summit since they have a 1 year warranty. I always had spares and would swap a new one for the bad one and send it back to summit. It was cheaper that buying Ford coils. They are usually $30.00 each for Accel coils. They are 10 times better than the junk Visteon built for Ford. It is a terrible design.

*willied* · 02-28-2011, 10:52 PM

The original post is about 9 months old, but I guess someone searching might find this useful.

06-25-2010, 03:52 PM	#1
mmccurley Wannabe Elite Explorer Peachtree City, Ga '06 Explorer Eddie Bauer Join Date: Jun 2010 Posts: 1 Vehicle Specs (Original Poster)	Cylinder 5 misfire / System Too Lean? 2006 Explorer Eddie Bauer 4.6L V8 automatic Hello, this is my first post. I hope I'm doing this right. I apologize if I'm not and I will work on learning the site better for future post. I looked through the site for the issue I am having and I could not find what I was looking for. The issue that I'm having is that my 2006 Explorer Eddie Bauer is running rough. I am getting the engine light coming on and it flashes. When this happens the AC cuts out (too hot these days for that to happen)...I read in the manual that this probrably would happen to keep the engine temperature down. I have a code reader and it is telling me: -System Too Lean Bank 2 -Cylinder 5 Misfire Detected and occasionally it gives the code: -Random/Multiple Cylinder Misfire Everything I have tried has not changed any of the codes What I have done: -replaced all spark plugs with Ford Dealership plugs ($20 apeice - wow) -changed the coil pack on the #5 cylinder with a new one. Any suggestions?

06-29-2010, 08:49 AM	#2
cwescapexlt4x4 Wannabe Elite Explorer Avondale, AZ 06 Explorer EB V8 4x4 Join Date: May 2005 Posts: 315 Vehicle Specs	While at the dealer, did you have them run a diagnostics on the engine? __________________ ~~~~~~~~~~~~~~~~~~~~~~ 2011 Kia Optima SX (Turbo) 2011 VW Jetta Sportwagen TDI (Diesel) Gone -2006 Explorer Eddie Bauer 4x4 V8 / - 2001 Escape XLT 4x4 V6 / 2001 Focus SE Wagon

01-13-2011, 08:47 PM	#3
lindapooh6400 Wannabe Elite Explorer 2002 4.6 eddie bauer Join Date: Jan 2011 Posts: 4 Vehicle Specs	i am having the same problem with mine on cylinder 5 i have not yet found the problem but have you looked at crankshaft sensor or looked for a bad wire in the harness around the a/c,

01-17-2011, 02:39 PM	#4
superinstaller Wannabe Elite Explorer columbia,sc 2006 1996 Join Date: Dec 2010 Posts: 42 Vehicle Specs	Start swaping them coils around.

01-18-2011, 12:41 PM	#5
thebrakeman Wannabe Elite Explorer Canton, Michigan Join Date: Feb 2009 Posts: 472 Vehicle Specs	That's what I've heard is the best way to see if it's a coil problem. If you swap coils #5 and #6 (for example), then the code-readers says #6 misfire, you know that coil is bad. If it stays at #5 misfire, the coil is good, and the problem is something else. __________________ thebrakeman ('70) DW ('71), DD ('99), DD ('01), DD ('05) 2006 Mountaineer Premier V8 AWD w/Tow Package, ScangaugeII Cashmere/Camel Interior, navigation, power 3rd row 2004 Surveyor 261T Hybrid Travel Trailer (27 ft) Equal-i-zer 10,000 lb 4-pt Sway Control WDH

01-18-2011, 12:54 PM	#6
pickupman6 Wannabe Elite Explorer jack al 2000 explorer xls 4.0 ohv Join Date: Aug 2010 Posts: 146 Vehicle Specs	im not too familiar with the 4.6 but if cyl 5 is on bank 2 i would swap fuel injectors around like u would with the coil. if your #5 injector isnt puttin out enough gas then that bank wil get a lean reading from the o2 sensor and u will get a misfire.

02-28-2011, 10:41 PM	#7
jimmyboy Wannabe Elite Explorer troy mi 2006 Eddie Bauer Join Date: Feb 2011 Posts: 7 Vehicle Specs	It sounds like a coil. I had 14 coils go bad on my F150 with a 4.6 over a 7 year timeframe. I finally started buying them from Summit since they have a 1 year warranty. I always had spares and would swap a new one for the bad one and send it back to summit. It was cheaper that buying Ford coils. They are usually $30.00 each for Accel coils. They are 10 times better than the junk Visteon built for Ford. It is a terrible design.

02-28-2011, 10:52 PM	#8
willied Elite Explorer Columbus, GA 2006 XLT V8 Join Date: Dec 2009 Posts: 979 Vehicle Specs	The original post is about 9 months old, but I guess someone searching might find this useful.