[updated:LAST EDITED ON 27-Feb-02 AT 10:21 AM (EST)]OK, Code 301 (misfire #1 cylinder). Changed plugs. drove a week, started missing, Changed wires, still missing, finally got an error code, 304 code (#4 cylinder misfire) Checked #4 plug almost destroyed...porcelain and electrode almost completely gone (plug a week old). started and ran engine without plug hoping to blow any debris out. Put new plug in, still getting 304 error code, checked spark, looked good, replaced coil pack for that group of cylinders, has spark (knocked the snot out of me), still missing, still getting error code 304.

What is my next step?????

is this possibly an injector at this point?

YD

 

If your plugs are burning up in a week, you must have a very lean mixture. Definitely check out the fuel system. Be carefull, lean mixtures like this can burn holes in your pistons! Good luck!

Superbru
2002 F150 Super Crew
5.4 4X4 Lariat

 

Only 1 plug burned up and it could've been damaged when I got it or as I put it in (#4 cylinder is a little hard to get to). If my mixture was too lean I could expect other cylinders to have problem couldn't I?


Thanks for your response,

YD

 

Each cylinder has it's own injector. One cyl. could have a problem and not another...


Superbru
2002 F150 Super Crew
5.4 4X4 Lariat

 

It appears that your orginal problem was the #1 cyclinder, then the #4 cyc. You have eleminated the plugs, wires and the coil. I believe that a compression test or pressure test to check the head/head gasket would be a good next point.

 

[updated:LAST EDITED ON 27-Feb-02 AT 10:37 PM (EST)]Thanks DAW


YD - was afraid of that.

 

Problems with Cylinder #1 and #4 apparently were unrelated. #1 taken care of with plugs, #4 was a burned intake valve.

Thanks to all who replied.


YD