Skipping bad.
06-03-2010, 07:08 PM
#1
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Skipping bad.
My 99 F150 5.4L 4x4 developed a horriable skip on the way home today. I was driving and it started as a studder, now it is a full out truck shaking skip under a load and a noticable skip when not under load. I have pulled the coils, and plugs, all look good. Put dielectric grease in the coil boot and reassemble them all, now the skip is even worse. I hooked a code scanner to it even though it had no check engine light on and it had no codes even though its skipping bad. Any ideas??????????
06-04-2010, 06:55 AM
#3
When was your fuel filter last changed, plugs as well?
A Haynes book, (about $10) & a digital multi-meter to test ohms & volts are 2 great tools to have.
I know I cannot be without either. In addition you can purchase Hayne's Code book for more details in regards to codes instead of the basics regular Hayne's book offers.
A Haynes book, (about $10) & a digital multi-meter to test ohms & volts are 2 great tools to have.
I know I cannot be without either. In addition you can purchase Hayne's Code book for more details in regards to codes instead of the basics regular Hayne's book offers.
06-04-2010, 09:34 AM
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The plugs were changed about 5000 miles ago with no problems until now. The fuel filter was changed as well at that time. I did not check the coils or the injectors as i dont know how. Im getting a book today and hopefully it will tell me how to check them. Im almost positive that it is coil but I just dont know which one yet.
06-04-2010, 09:56 AM
#5
A quick tip that I do and it works for cop's as well as injectors is with the engine running unlpug each one and listen for a change in the way the engine runs.....if you dont hear a change then you found your dead coil.
06-04-2010, 10:03 PM
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I tried the unplugging method but my hearing is so bad from being blown up 9 times in iraq i couldnt tell a diff. Im gonna try to check the resistence in the coils tomorrow to see if i can find a bad one. I noticed that the boots seemed to be coated in that elec grease and I was wondering if that crap got inbetween the end of the coil and the end of the spark plug would it cause a short?
06-04-2010, 10:07 PM
#7
I tried the unplugging method but my hearing is so bad from being blown up 9 times in iraq i couldnt tell a diff. Im gonna try to check the resistence in the coils tomorrow to see if i can find a bad one. I noticed that the boots seemed to be coated in that elec grease and I was wondering if that crap got inbetween the end of the coil and the end of the spark plug would it cause a short?