TonyTheTiger57 Posted April 21, 2012 Report Share Posted April 21, 2012 I have been driving 2000 miles per week for work for 3 weeks now, when sitting at a light or idleing I can feel the engine shaking and rumbling, I never felt this before.. I am just worried something may be up..my engine has crapped out once before and was covered under warranty. Any input would be helpful. There is not a CEL on and it runs strong, I just changed the oil 2 weeks ago used Motorcraft oil & a purolator oil filter It has a CAI on it and that is it. Link to comment Share on other sites More sharing options...
Crash712us Posted April 21, 2012 Report Share Posted April 21, 2012 I would look at the stickies regarding the TSB regarding plugs. Link to comment Share on other sites More sharing options...
FLIP-4-SHO Posted April 21, 2012 Report Share Posted April 21, 2012 Fuel Filter. Air filter. Plugs ect. first. Fuel pressure from pump. Link to comment Share on other sites More sharing options...
TonyTheTiger57 Posted April 21, 2012 Author Report Share Posted April 21, 2012 These cars dont have a serviceable fuel filter... my air filter is perfectly fine... I am sure the fuel pressure is good too, it starts and runs fine.. Link to comment Share on other sites More sharing options...
TonyTheTiger57 Posted April 21, 2012 Author Report Share Posted April 21, 2012 Doy ou know what the part number is for the correct plug is off hand? I will order a new set and get them in there, these plugs have 15k on them now. Link to comment Share on other sites More sharing options...
EcoBrick Bob Posted April 21, 2012 Report Share Posted April 21, 2012 Go to Rock Auto and order the correct plugs for the 2011 SHO... Motorcraft #SP-528 (CYFS-12-Y3). You can also look on TSB 10-2-6 which covers plug & warranty issues. They are quite easy to change... Gap is set from Motorcraft supplier at factory, so you shouldn't attempt to change. Didn't they replace the plugs when you got your new engine? Link to comment Share on other sites More sharing options...
darreli Posted April 21, 2012 Report Share Posted April 21, 2012 Go to Rock Auto and order the correct plugs for the 2011 SHO... Motorcraft #SP-528 (CYFS-12-Y3). You can also look on TSB 10-2-6 which covers plug & warranty issues. They are quite easy to change... Gap is set from Motorcraft supplier at factory' date=' so you shouldn't attempt to change. Didn't they replace the plugs when you got your new engine?[/quote'] Wouldn't completely trust the pre-gapped plugs. Always double check them Link to comment Share on other sites More sharing options...
bpd1151 Posted April 21, 2012 Report Share Posted April 21, 2012 My plugs were VERY dirty, and that was at about 30k on the clock. I'd agree with others, swap out the plugs & yes, double check the gapping. Especially since there was a previously known issue with the factory plugs. Darrell and I are running plugs that are 2 stages colder, Darrell rock'n the Denso's, and me, the NGK's. There's a thread I started on it that has both part numbers for either product you prefer..... search it up :thumb: Sent from my DROID3 using Tapatalk 2 Link to comment Share on other sites More sharing options...
EcoBrick Bob Posted April 21, 2012 Report Share Posted April 21, 2012 Wouldn't completely trust the pre-gapped plugs. Always double check them I normally agree but the box says" CAUTION: SPARK PLUG GAP IS NOT ADJUSTABLE" I checked them all and they were all .035. Since you have already gotten one free engine... I would be very careful not to "rock Ford's warranty police".... I would stay with Ford's recommendation. In fact... ALL of my stripping was done on the original 2010 spec# Motorcraft plug. At 34,500, I finally had the #6 snap the ceramic and slide up and down on the center. Surprisingly, all looked really good... a nice light brown. Link to comment Share on other sites More sharing options...
TonyTheTiger57 Posted April 21, 2012 Author Report Share Posted April 21, 2012 Yes they all look like a nice light brown, I think I will buy a new set of plugs and install them. Link to comment Share on other sites More sharing options...
Blaine109 Posted April 21, 2012 Report Share Posted April 21, 2012 Do a search for knock sensors and check for that issue. Link to comment Share on other sites More sharing options...
Showgun Posted April 22, 2012 Report Share Posted April 22, 2012 I have been driving 2000 miles per week for work for 3 weeks now' date=' when sitting at a light or idleing I can feel the engine shaking and rumbling, I never felt this before.. I am just worried something may be up..my engine has crapped out once before and was covered under warranty. Any input would be helpful. There is not a CEL on and it runs strong, I just changed the oil 2 weeks ago used Motorcraft oil & a purolator oil filter It has a CAI on it and that is it.[/quote'] Why not let the dealer look after it? you still have warranty right? Just make sure the Intake is correct and go in. Wouldn't completely trust the pre-gapped plugs. Always double check them +1 on that. Pregapped sometimes is way off. Not good to rely on at all. If you regap, don't pry between electrodes. It will bend the delicate center electrode. Use a side electrode bending tool. C. Link to comment Share on other sites More sharing options...
EcoBrick Bob Posted April 22, 2012 Report Share Posted April 22, 2012 I still check the pre-gapped plugs. So far, they have been correct. What plug # was in the engine after replacement? The way to tell if you have a cracked insulator is turn the plug with electrode down. ceramic will be in a different position than when it is view with electrode up. ceramic moves up and down. Link to comment Share on other sites More sharing options...
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