I have an 02 with 205k miles on it and lately it has been shaking really bad. The check engine light came on and I have a misfire on cyl 6. Any ideas how to figure out whats causing this? I changed the Spark Plugs 30k ago and Ignition Coils 40k ago. I usually use fuel injector cleaner as well. How do i see whats causing this?

 

MAKE sure you plugs are tight... back them off and torque to 28 ft lbs... your plug might be wiggling its way out!!!!

 

You did replace them with all Motocraft right?

 

What plugs did you use? Modulars dont like plugs that are not made to specification or better. Did you use dielectric grease? Change the boots when you did the plugs 10k later? The boots get damaged taking them off. Other wise it could be an injector but they rarely fail on those engines.

 

i replaced the plugs with motocraft and i used dielectric on them. I bought a new ignition coul and a new plug and some injector cleaner but im not sure what cylinder is 6. how are they ordered on these engines?

 

left side(driver side is 5-8)
right side(pass side1-4)

dielectric grease will cause a misfire if it gets on the contacts.... take em off, check em for torque and clean them.... grease should be put on the plug, on the porcelin part only

 

bada bing a new ignition coil and no more shakes, the check engine light did not turn off tho, will it turn off eventually or must i clear it?

 

just unhook the battery and turn the headlight switch on for about a half hour to clear the codes.

 

Just unhook the negative cable and leave it unhooked for about 10-15 minutes. If you got the problem then you wont see the check engine light anymore.