I'm getting the P0305(misfire) error under wide open throttle at 4200 rpm. It stumbles, no pinging, just breaking up. If I stay in it, at about 4800 ish it smooths back out. The check engine light flashes while it stumbles.
I replaced the plug, injector, COP, and the O2 sensor on the drivers side back.
Still get the same error! Anyone have any ideas what to check next?

TIA,
MJ

 

I did a search:

<LI class=g>OBD-II Trouble Code: P0305 Cylinder 5 Five Misfire Detected

Description of vehicle obd trouble code P0305 - Cylinder 5 Five Misfire ... A P0305 code means that the the car's computer has detected that one of the ...
www.obd-codes.com/p0305 - 18k - Cached - Similar pages
<LI class=g>P0305 - Cylinder 5 Misfire Detected - 6speedonline.com Forums

15 posts - 4 authors - Last post: Sep 3, 2006
So I was reguliarily getting P0301 (Cylinder 1 Misfire Detected) and P0305 (Cylinder 5 Misfire Detected). Last week when I had my new ...
www.6speedonline.com/forums/996-turbo-gt2/57488-p0305-cylinder-5-misfire-detected.html - 124k - Cached - Similar pages
<LI class=g>i have P0305 (cylinder 5 misfire detected) and P0205 (injector ...

Jeep question: i have P0305 (cylinder 5 misfire detected) and P0205 (injector circuit open) error codes on my 2002 Liberty.
www.justanswer.com/questions/1hj2d-p0305-cylinder-5-misfire - 28k - Cached - Similar pages
<LI class=g>Misfire Monitor

Aug 3, 2005 ... P0305 Cylinder 5 Misfire Detected. P0306 Cylinder 6 Misfire Detected. TROUBLESHOOTING. If the Monitor detects random deviant cylinder events ...
www.fordscorpio.co.uk/misfiremonitor.htm - 28k - Cached - Similar pages
<LI class=g>P0305 Problem Solving at FixYa

code p0305,cylinder 5 misfire detected,p0303 cylinder 3 misfire deteced p0174 bank 2 system too lean... Support for 2000 Ford Windstar ...
www.fixya.com/tags/p0305 - 58k - Cached - Similar pages
<LI class=g>Ford F150 P0305 Cylinder 5 misfire

 

wow! that should help you a lot. way to go larry

 

 

Thanks! I'm looking through them. Unfortunately it looks like mechanical or conections based on the data so far. Going to the dealer today.

 

I use this site often, with excellent results:

http://www.obd-codes.com/search/

 

Hello DBLX

i have a 2007 5.4 f150 limited
this truck have the same problem as your truck i have change the sparkplugs and the cops all 8 for 2 times, the are originale motorcraft parts the truck is never driven oke it has a mileage of 25000 mile the garage has no idea they have a IDS tester from Ford the truck have all updates the trouble code p0305 and p0304 are coming back every time
the TRUCK is in the Netherlands and i bought it when he was new

maybe you have allready an idea of your problem is solved

best regards Gaston Drost