Ford F-150 (2004-2008) :: Running Rough And Skipping After Plug Change?
Mar 3, 2012
I just completed a successful second spark plug change, using Motorcraft SP515 plugs just like last time. After reconnecting battery and starting engine, it ran poorly throughout a short road test. Felt like it was skipping. Checked under the hood and found that the #2 fuel injector was disconnected, so I reconnected the injector.
I took another short road trip and it still ran poorly as if skipping. So, this time I disconnected the battery for several minutes while removing the #2 plug thinking I may possibly have fouled the plug by the injector not being connected. I also checked all of the other injector and coil connections. Reconnected battery and took another short trip. It still runs poorly. No codes yet.
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I built the 400 in my 79 a couple years ago and it runs very well...until yesterday. I'm about 80 miles into this tank, and on my way home from work, I thought I felt a vibration (not in the steering wheel, but in the front oc the truck). Then the engine became evident it was running rough and was skipping and surging. I stopped.
It idled pretty rough, then died. Fired right back up, ran rough, and died. Sometimes it would idle smooth for several seconds (20-30) then start surging and skipping and die. I could hold a little throttle and it would run about the same, except some backfiring in the exhaust (more like a big hiccup).
The carb is a 670 Street Avenger with nothing really done to it. The bores are really black (not sooty, more damp or so). I have always used the air filter, so that's odd. I took the carb off and removed the bowls. Nothing inside has a dirty or clogged appearance at all. Not sure if I should completely rebuild it.
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I have an 04 F150 5.4 w/67k. Just changed the OE plugs. While I had it in the garage also cleaned the K&N air filter. Truck runs great but I lost about 3 MPG. I was getting 16 all around and am now getting about 13 under the same conditions. I bought a Purolator air filter and switched it with the K&N but there had been no difference. I used Champion plugs as the replacements. Truck ran great before and runs great now.
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I have a 2006 Fx4 with 60,000 miles. I wanted to change the spark plugs myself yet I can't seem to find were they are in the engine, I know how to take them out but I don't know how to get to them.
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I just changed the plugs in my 05 stx 4x4 4.6L. Truck was running fine, never a problem but it has 105k so I figured id change them. #4 was the only one that gave me a little problem (besides being so tight). The coil and spring pulled off the boot, and I had to get a pair of pliers and get the boot off the plug.
I simply slid the spring back through the boot and replaced it once I had changed the plug. Other than that they all came out easily. I replaced with motorcraft plugs, and #5 did have what looked like some oil down on the threads when I pulled it out, but not sure if that's a big deal or not
Any way, I am torn between ordering new boots and changing them out, or just biting the bullet and getting 8 new coils with new boots attached. Truck runs fine, but does the usual buck/jerk under a load in overdrive now (never once did it before)...
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In the "Old days" I could pull the one-and-only coil wire and trigger the starter motor to rotate the converter so the plug was at the bottom. How do ya do this with COP engines so the engine does not start?
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Okay I have a 2006 F-150 5.4 60,000 miles , Never once had any problems. I have always done the oil changes myself using 5w-20 mobile super and an S2 STP oil filter. Today, I did a normal oil change and once i filled it up I checked the oil it one last time and I topped it off just right according to the dipstick. And I also checked it after letting engine idle for 5 minutes. I changed the fuel filter also ( first time doing) but no leaks. I drove about two miles down the road, turned around and when I put it into reverse it idled really rough. It almost sounded like a thrown rod.
The rpm's dropped to about 500. I put it into drive and gave it a little gas and then all was fine. Engine ran perfect. I reversed it at least 5 more times and it did it every time but always recovering when given a little gas. I also noticed that there is some oil splashed on the undercarriage like it was leaking going down the road. I checked the filter gasket and it was fine and intact. It idles great in park, drives great. Just reverse it dives down and vibrates like crazy.? After getting home I noticed that the oil level on the dipstick is a little less than a 1/4 inch over the correct level.
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Our 2007 Avalon with 65xxx miles on it was skipping and running rough this morning. Running a scan with my VAG-COM gave me these codes.
Mode 07: Pending emission related fault codes Address 7E8: 2 Faults Found: P0305 - Cylinder 5: Misfire Detected P0355 - Ignition Control Circuit for Cylinder 5: Malfunction
Would you say it is time to replace the Coil for this cylinder, or should I do more troubleshooting first?
From what I've read on this forum, it appears cylinders 1, 3 & 5 are at the rear of the engine and are a PITA to change. Is there a good write-up or video on how to change these at the rear of the engine?
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History: Truck was running okay but acted like a coil was bad when under load. I changed out all the plugs with Motorcraft and put on Summit racing COPs.
After the plug and cop change the truck will run rough after it is warmed up. I changed back to the old COPs and it runs the same.
First I replaced the MAF sensor after finding many posts on here about it. No change.
I read a bunch of posts on oil causing the problem so I used 10-30w and nothing changed.
I searched for a vacuum leak with carb cleaner and couldn't find one. I removed, cleaned and reinstalled the throttle body.
When I did the plug change I disconnected the PCM without disconnecting the battery. Would this cause this type of problem?
I think this is about all the stuff I found to try in the threads that came up through searching.
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My f-150 has an intermittent rough idle and consistently runs rough when you accelerate quickly. Vehicle is not throwing any codes?
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I have a Ford F150 XLT. I have 67000 miles on it and the other night it just started running rough out of no where near idle. Once you got over 20mph the rough running would go away. I took it to get an engine change and engine flushed but it came back. It doesnt always run rough near idle or below 20mph. The Ford dealer says my engine has only 22 psi oil pressure near hot idle and cant engage the VCT phazers and they want to replace the whole engine.
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My 05 was running rough and misfiring quite frequently. After much deliberation, I took it in for a diagnostic hookup. The dealer said my driver side cat was clogged. Lucky for me, I was just under the warranty period(79673 miles). I have had it replaced and I can feel a noticeable difference in the way it runs. Could a clogged cat have made it run that poorly or am is it just in my head that it is running alot better?
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I have 07 sscrew with 5.4. 93,000 miles. At start up truck runs perfect. After 20-30 minutes of running motor will start to start running rough at low rpm. Diesel sound. I can rev up and motor clears up and idles fine. Should I replace VCT solenoids? Or phasers? Or both at one time??
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I just bought a 2007 F150 XLT with a Triton 5.4 with 80,000 miles on it. My problem is this, the engine seems to run ok ( a bit rough) until it gets up to running temp and I have driven about 10- 20 miles then most of the time, it starts to act up.
When I am driving it is fine, but when I slow down and come to an idle about 500rpms, it sometimes runs very rough, sounds like a diesel and shakes violently. It feels like it is doing damage. Sometimes it stalls. If I rev it back up immediately it will smooth out.
In speaking to some friends they've suggested things from plugged oil channels, (affecting the cam phasers? All the way to it needing new chains, phasers and guides. I don't want to spend a ton of money doing an improper service repair only to have the issue show up later . But there seems to be a lot of different answers to the same problem. Is the dealer going to be able to diagnose something like this fairly well? Or should I try to narrow it down a bit first?
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I changed the timing chain, phasers, tensioners, guides, and cam sensors and solenoids about 30k miles ago. Truck now has 170k miles. This past weekend engine started running so rough, it had the whole front end shaking. Threw 8 codes..1 bank..lean, bank 2 rich, timing retarded, cylinder G and F misfire, and more codes. It seems to have jumped timing pretty bad.
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the F150 of my brother has the follow diseases:rough running ticking noises, low mileage per gallone, blue smoke out of exhaust after start, i have ordered the cam phaser, hope, that will be the reason. But today, my brother means, i have to do a test drive, because the truck has no power. and really, feels like missing of one or two cylinders. Very bad performance. Is it possible, that the reason are the phasers?
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I just had my 04 5.4l engine rebuilt. Ive driven it about 500 mi and it started running rough at a stoplight. I tapped the accelerator and it started running good again but service engine light came on. I pulled the codes and they were P0022, PO345, P0340,and P0430. It has done this several times now. Everything was replaced including the phasers, except for the camshaft sensors. Could they cause this problem?
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On my way into work this morning, my 06 with the 5.4 started running very rough/shaking at low rpms. I could kick it out of overdrive and it would smooth out and seemingly be fine at higher rpms.
This worked out for a couple of miles until the truck just died on me completely. The Edge is showing po351, 352, 353......358 codes. Ignition coil Primary/Secondary circuit fault on every cylinder.
I'm thinking its unlikely that every coil failed simultaneously....computer? When I try to start the truck, it will try to hit on a cylinder or two, but will not run.
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I have a 2004 Ford F150 with 149,000 miles I have recently put 5,000$ In the motor that is a 5.4 V8 before it would shake and make a terrible noise got a brand new engine from Ford put in by a ford mechanic but now my rear end squeaks like crazy and it is all the time more so when going up or down a hill or when it's shifting more or less or going over a ruff surface that's been going on awhile and was told I needed a new rear end by the same ford mechanic and wanted 1,000 to fix it!
But also said the whining noise that is coming from the front was the transmission and that I shouldn't worry about it to drive it till it goes out but it's a terrible whining noise that you only hear it when your in gear not in park or neural the truck sounds good what causes this whining noise?? Not done yet but recently the front driver side around the wheel has also gotten a squeak mostly when in low speeds and turning to the left! What to do? I'm already replacing the motor! Hopefully these are some easy fixes! I've done some research and the whining from the front that I was told to be the transmission doesn't seem to be that I would think more along the lines of pulley or alt!
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I have a 2006 f150 it was making a knocking noise after the engine oil temp reached 160* and made the noise to 1700rpms. I thought it was the cam phasers so I replaced them. The truck is still making the noise and running rough and stalling but not as bad and not as often. Before it did it all of the time. The truck is timed properly. I had a new cam sensor and tried it but that did not work. I watched vct on the scan tool and both cams are in sycn.
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I am working on a customers 08 F-350 5.4l has 135k on it. came in with a severe rattle/knock, running poorly, and dying at stops. ECM gave up 8 codes relating to the timing... Found the phaser replacement steps here on FTE and followed them and replaced the VCT solenoids since i was in there. Customer reported that he replaced the cam sensors already. Ran great for a day, and the next day when I pulled into the shop it gave me a rattle. Not as violent as before but noticeable. I special ordered the wedge and followed the replacement to a 'T'. I have no performance issues and no codes.
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