sheppd01 Posted May 31, 2015 Report Share Posted May 31, 2015 (edited) I think the car has this problem for a while but I wasn't for sure at first. I first noticed it at highway speeds. It would shutter a little while cruising at highway speeds. I also noticed that I would have to give it a little more throttle to make up the mountains. There was a time that I had to be careful because it would smoke the tires if I floored it in 2nd or 3rd. Well yesterday it couldn't do it in first. I was rolling around 10mph floored it and it took off, but didn't have the power to cut the tires lose. Now I feel the shutter while driving though the neighborhood. It still sounds the same and no warning lights. Any ideas? A tune up? Fresh plugs, fuel filter,,,,,, Nothing done to the engine since it had 2,000 miles on it. New clutch around 20,000 miles. Almost 40,000 miles now. Edited May 31, 2015 by sheppd01 Quote Link to comment Share on other sites More sharing options...
Secondo Posted May 31, 2015 Report Share Posted May 31, 2015 Have you changed or cleaned the air filter lately? You'd be surprised. Quote Link to comment Share on other sites More sharing options...
sheppd01 Posted May 31, 2015 Author Report Share Posted May 31, 2015 (edited) That was the first thing I did. Edit.... Cleaned it...Shutter Removed it completely and drove around the block......Shutter Edited May 31, 2015 by sheppd01 Quote Link to comment Share on other sites More sharing options...
08KR525 Posted May 31, 2015 Report Share Posted May 31, 2015 Maybe bad fuel? Did you just fill it up recently? Also, you don't think a fuel line is pinched or the fuel filter is clogged? You know it's getting air, so that just leaves fuel and spark. GL and keep us posted. Quote Link to comment Share on other sites More sharing options...
blueovalkid Posted May 31, 2015 Report Share Posted May 31, 2015 Fresh spark plugs and fuel filter would be my next move. Quote Link to comment Share on other sites More sharing options...
Secondo Posted May 31, 2015 Report Share Posted May 31, 2015 Fresh spark plugs and fuel filter would be my next move. +1 Quote Link to comment Share on other sites More sharing options...
08 snake Posted June 1, 2015 Report Share Posted June 1, 2015 sounds like something our 07 Expedition did...5.4 motor...had to have the plugs and wires changed....cleared it right up...good luck Quote Link to comment Share on other sites More sharing options...
americaniron Posted June 1, 2015 Report Share Posted June 1, 2015 Had the same problem. It turned out to be my fuel filter. Went away as soon as I changed it. Quote Link to comment Share on other sites More sharing options...
ShelbyKR664 Posted June 1, 2015 Report Share Posted June 1, 2015 sounds like something our 07 Expedition did...5.4 motor...had to have the plugs and wires changed....cleared it right up...good luck Funny you say that. I had to do the same thing with my 07 Expedition at 45,000 miles. I was lucky in that the warranty covered it. Not sure why as I consider that a maintenance item. Have not had a shutter issue in over 17,000 miles. Shepp, hope you resolve your issue. Quote Link to comment Share on other sites More sharing options...
08KR525 Posted June 2, 2015 Report Share Posted June 2, 2015 Didn't those 5.4s in the trucks and suvs' use a two piece spark plug originally? Quote Link to comment Share on other sites More sharing options...
grsybtch Posted June 2, 2015 Report Share Posted June 2, 2015 OH MY God!!!! What's wrong with you???? It's the value dropping.......Just look at EBAY!!!!!!! (figured I'd get that in before KXTRDHYYTYT got here) Quote Link to comment Share on other sites More sharing options...
08KR525 Posted June 2, 2015 Report Share Posted June 2, 2015 Now that's funny grsybtch. I don't care who you are. Quote Link to comment Share on other sites More sharing options...
BIKEBOY Posted June 2, 2015 Report Share Posted June 2, 2015 OH MY God!!!! What's wrong with you???? It's the value dropping.......Just look at EBAY!!!!!!! (figured I'd get that in before Sideoiler got here) Quote Link to comment Share on other sites More sharing options...
BIKEBOY Posted June 2, 2015 Report Share Posted June 2, 2015 I'm in the FF camp myself. Good luck. Quote Link to comment Share on other sites More sharing options...
08 snake Posted June 2, 2015 Report Share Posted June 2, 2015 Didn't those 5.4s in the trucks and suvs' use a two piece spark plug originally? some of the techs said it was a very poorly designed set up with the plugs...they were said to be a real pain to change Quote Link to comment Share on other sites More sharing options...
sheppd01 Posted June 2, 2015 Author Report Share Posted June 2, 2015 I haven't touched the KR yet but I plan on changing the plugs, fuel filter and all the fluids before I start it again. Maybe this weekend.. On a probably related note. Wife just got her car back from the dealer; 7,000 misfires on two cylinders. Quote Link to comment Share on other sites More sharing options...
08krrick Posted June 4, 2015 Report Share Posted June 4, 2015 I think the 3 valves and some of the 5.4 motors had problems with the plugs seizing in the heads. I was told that the gt 500 motors do not have that problem. Quote Link to comment Share on other sites More sharing options...
2010KonaBlueGT Posted June 4, 2015 Report Share Posted June 4, 2015 I was leaning towards fuel filter too but with misfires on 2 cylinders, spark plugs would be the first thing I'd change. Phill Quote Link to comment Share on other sites More sharing options...
mavisky Posted June 4, 2015 Report Share Posted June 4, 2015 Plugs and fuel filter would be my advice. Fuel filter is supposed to be done every 15,000 I think. Not too hard to do either, just have to remove part of the driver's side plastic cover under the door and it comes right off. Quote Link to comment Share on other sites More sharing options...
shelbypt Posted June 22, 2015 Report Share Posted June 22, 2015 From the beginning, i was thinking a plug coil. I had a coil go on the number one cylinder. Could it be possible to have two. On another note, summer heat will deplete the power on these cars... Quote Link to comment Share on other sites More sharing options...
sheppd01 Posted October 4, 2015 Author Report Share Posted October 4, 2015 (edited) I have changed the plugs, air-filter, and the mass airflow sensor. All the plugs where black except one. It was white. It runs better now but still is not at 100%. You can see in the beginning of the video it back fires when I let off the gas. Last year it would make a cool rumble sound when letting off the gas but now it pops. What does that mean? I didn't really notice until I watched the video but it sounds like it also pops when I was slowly giving it gas. Maybe I am being paranoid. I was going to take it in to a very good tuner but he has had recent health problems so I am back to trying to figure this out on my own. https://www.youtube.com/watch?v=6BuPpuz7QZk Edited October 4, 2015 by sheppd01 Quote Link to comment Share on other sites More sharing options...
msb64 Posted October 10, 2015 Report Share Posted October 10, 2015 Do you know which cylinder the white plug came out of? That would be a good place to start checking. For those who are not aware, alway track which plug comes out of which cylinder. A piece of cardboard with 2 rows of 4 holes poked in them and numbered lets you easily do that. Also check the gaps on the plugs going in and coming out. For modified/increased boost engines, to prevent misfires reduce spark gaps smaller than the oem factory settings. For the cylinder that had the white plug, I would carefully check the coil pack and the injector to start with, along with their wiring and associated connectors. Make sure they are fully seated and snap locked in place. Quote Link to comment Share on other sites More sharing options...
sheppd01 Posted October 11, 2015 Author Report Share Posted October 11, 2015 At this point I am 90% sure it is the coil. I have a set on order. Quote Link to comment Share on other sites More sharing options...
belltr Posted October 16, 2015 Report Share Posted October 16, 2015 where do we stand with this, Your KR's younger sister over here in MD is getting worried Quote Link to comment Share on other sites More sharing options...
sheppd01 Posted October 16, 2015 Author Report Share Posted October 16, 2015 I believe I have figured out the problem and the new parts are sitting in my garage. Unfortunately I am in Frankfurt. Hopefully I can get to it next week. Quote Link to comment Share on other sites More sharing options...
shelbypt Posted October 17, 2015 Report Share Posted October 17, 2015 I hope the coil takes care of this!! It worked on mine and I know that it's nothing major!! You have a TVS on your KR? I saw the 15lbs of boost!! That's where mine's at... Quote Link to comment Share on other sites More sharing options...
sheppd01 Posted October 19, 2015 Author Report Share Posted October 19, 2015 (edited) I took it for a 4 hour drive yesterday. Seems to be back to normal. Edited October 19, 2015 by sheppd01 Quote Link to comment Share on other sites More sharing options...
08KR525 Posted October 21, 2015 Report Share Posted October 21, 2015 I'm glad to hear you got it lined out. Quote Link to comment Share on other sites More sharing options...
Secondo Posted October 21, 2015 Report Share Posted October 21, 2015 What caused the problem? Quote Link to comment Share on other sites More sharing options...
sheppd01 Posted October 27, 2015 Author Report Share Posted October 27, 2015 (edited) While it seemed to run better and I hoped I had fixed it I was wrong. It was getting 14 mpg highway and still didn't have all the power it should. My best guess now is an injector or a valve problem. Johnny Lightning has it now. He is going to start with a compression check and go from there. The good news is if it is a valve problem I already have the wife talked into upgrading the cams. ? Edit I am not a mechanic but my best guess is that it had an injector that went bad and caused one of the cylinders to run lean. That was the reason for the one white spark plug and it may have also messed up the valves. Edited October 27, 2015 by sheppd01 Quote Link to comment Share on other sites More sharing options...
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