Spark Plug or Injector or Both - Ford Truck Enthusiasts Forums

Spark Plug or Injector or Both

Thread Tools Search this Thread
Old 03-02-2014, 04:27 PM
jefftb jefftb is offline
Senior User
Thread Starter
Join Date: Feb 2007
Location: East Tennessee
Posts: 195
jefftb is starting off with a positive reputation.
Spark Plug or Injector or Both

2007 5.4 Flex Fuel, 71,000 miles.

2 years ago had two coils replaced and all plugs replaced by dealer knowing that the spark plug issue was there. They had no issues apparently removing/replacing the plugs.

In the last 6 mos or so I've had a gas smell while sitting at a red light or in a parking place. 10 days ago my wife calls me and says its idling with a low engine RPM wobble and the CEL is on. She returns home.

I plug in my OBD scanner with Torque App. I get a P0304 and P0316. Cylinder misfire on #4. I go an remove it. The bottom 1/5 of the outside of the rubber boot is covered in a grayish material. The spring coil looked dry with a faint smell of gas. I replaced the coil and the engine was good for all of 2 hours. No low end wobble at 600 RPM, nothing. Then it came back. We drove it this past week and then it got worse. Plugged in the scanner and had P0304 and P0308. I replaced #8 and the boot was good. Dry no moisture. P0308 was cleared and has not come back.

I pulled #4 and it was covered in carbon build up and the spring coil has black bits on it with gas. It looks like it has been in there for years and its 10 days old.

I'm wondering if the injector is stuck open or the plug is bad. I stuck a straw down the sidewall of the plug well and it came back filled with about 1/8" of carbon like sludge.

The coils replaced in the last 10 days were not the ones replaced 2 years ago.

Thoughts please.

I searched but with this issue I could read for hours in circles.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
2002 E250 5.4 starts out running fine, crawling in 10 minutes Ryan Simpson 1968-2013 Full Size Vans 15 04-12-2016 06:53 AM
Question about DTC P0351 xpedition 1997-2006 Expedition & Navigator 1 06-05-2015 02:40 PM
Getting Codes P0303, P0304, P0308 (Misfire in cylinder 3, 4, and 8) av8ing 1999 to 2016 Super Duty 0 08-18-2014 12:54 PM
5 cylinder misfire otgarza 1999 to 2016 Super Duty 3 07-06-2014 06:12 PM
p0304 p0316 oldhokie Escape & Escape Hybrid 1 05-11-2014 12:38 AM

Go Back   Ford Truck Enthusiasts Forums >

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -5. The time now is 10:32 AM.