99 Expedition running rough after reaching normal operating temp.
Thread Starter
|
Freshman User
Joined: Jun 2012
Posts: 47
Likes: 0
99 Expedition running rough after reaching normal operating temp.
Yesterday while driving home suddenly a misfire began. Seemed to increase when put under a load. Then rough at idle. It felt like it was running rich but, no smoke evident. Also, while under load the SES light illuminated intermittently. Then went away after no longer under load.
Cleaned the MAF, Throttle Body and air filter, drove it last night and was fine at idle and run up until the temp got close to normal operating temp.
I don't have a code reader with me so any ideas you might have would be appreciated.
1999 Expedition, 5.4, EB 4x4. 225,000 miles.
Cleaned the MAF, Throttle Body and air filter, drove it last night and was fine at idle and run up until the temp got close to normal operating temp.
I don't have a code reader with me so any ideas you might have would be appreciated.
1999 Expedition, 5.4, EB 4x4. 225,000 miles.
Fleet Owner
Joined: Apr 2008
Posts: 24,318
Likes: 5,128
From: 0,0,1
There is no code specifically stating there's a bad COP. You will more likely get a code P0301-P0308. This code indicates a misfire and the last digit is the cylinder number it is occurring in. But by having the code you can continue you diagnosis on just the one cylinder causing the misfire instead of all 8.
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
If you have a cylinder misfire due to a plug or COP it will pull a P0301 if it's cylinder 1, 302 for cylinder 2 etc. keep in mind the #1 plug is front passenger side going straight back to #4, #5-8 on the drivers side, front to back.
Thread Starter
|
Freshman User
Joined: Jun 2012
Posts: 47
Likes: 0
Just ran the code reader and the P1131 Lack of HO2S11 Switches Lean code appeared. O2 Sensor? What have you guys found on this one? I replaced the PCV and vacuum line around the intake manifold last year and that was a different code anyway.
Trending Topics
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
It a lean condition on bank 1 (pass side), upstream O2 sensor. Usually a lack of fuel pressure (fuel pump pressure or fuel filter clogged), a vacuum issue but it sounds like you are aware of the elbow issue on the pass side, or a plugged injector issue.
I'd change the fuel filter first if not done so as it's a pretty simple job with the quick connect tool.
Last would be a bad O2 sensor.
I'd change the fuel filter first if not done so as it's a pretty simple job with the quick connect tool.
Last would be a bad O2 sensor.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Thread Starter
|
Freshman User
Joined: Jun 2012
Posts: 47
Likes: 0
Ok, got back home from work after 5 days. This time I got ahold of another scanner tool I have used in the past. Here are the results: P0136, P0156, P1131 and P1151. The car has been sitting now for nearly a week. Started it and rough idle. Ran it long enough to get it into the garage and scan it. All this happened after a good amount of rain. Do you think its possible that the connectors got water on them, corroded then sent bad signals?
Thread Starter
|
Freshman User
Joined: Jun 2012
Posts: 47
Likes: 0
Well I checked fuse 23 and it was good. Today I changed the upstream Bank 1 O2 sensor and Bank 2 downstream that the codes were showing. Then cleared thcodes still running like it had a fouled plug. tok it for a drive and it showed a misfire and code P304 he readed cylinder #4. what are your thoughts on a COP and hard is it to get to and R&R?
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
Well I checked fuse 23 and it was good. Today I changed the upstream Bank 1 O2 sensor and Bank 2 downstream that the codes were showing. Then cleared thcodes still running like it had a fouled plug. tok it for a drive and it showed a misfire and code P304 he readed cylinder #4. what are your thoughts on a COP and hard is it to get to and R&R?
Several extention sizes, a good plug socket with foam insert, and duct tape the socket and extentions together to not loose them while trying to pull the plug out. I also taped the 8 mm socket to a short extention for the COP bolt, just to not loose that under the manifold. take your time as most of this will just be by feel.