Can somebody please help?!?! I have an 01 F150 4.6 SuperCrew that has popped a P0308 code. I have already changed out all the plugs and the COP on Cyl 8 treated the fuel and changed out the fuel filters. Still no fix. It hesitates and chugs after it has warmed up and when it accelerates. At cruising speed it is fine. Only when i need the horses does it hesitate and chug. Any info or insite would help!
Did you change plug wires? bad wire could be the culprit. If wires were changed...... I'd agree check compression between cylinders. Might have a leaking valve or sticky injector, can you swap 2 of them, see if the code moves with it. Did you put in Motorcraft plugs? might not be the cause of this problem but they do seem to last a lot longer than other plugs with these engines.
Not trying to be a wise guy but you did change the right coil? Also you might want to swap injectors I know that #8 is not easy to get to but a coil usually fixes this.
we had a 2003 ford with a 5.4 basically same engine in shop last week that was loosing compression on number 8 when it warmed up causeing a misfire code i would check that[/quote] Great! Thanks I'm going to put guages on it right away! Wish me luck!
All, I thank you for the quick replies. I am going to check compression on that cylinder and also try switching the fuel injectors. Have done a little bit of looking on other forums and a few other people had the same problem. Yes i have switched coils around and what not and no the code did not follow it. But i did this after replacing the #8 cylinder coil which is on the driver's side all the way against the firewall. I know its a little hard to get to but a 6" extension on a 1/4" drive and a 7mm gets it done perfectly! Yes all plugs were replaced w/ Motorcraft plugs and all gaps were checked. Discover more Vehicle vehicle IGNITION COIL Also there are no plug wires. Unless they sell a lead that runs from the wiring harness to that cylinder's COP?? Don't really hope its a leaking valve or anything internal but its gotta be done! Also does anybody know if there has been a TSB on this problem?? Thanks again to everybody!
RiverRat wrote: Also does anybody know if there has been a TSB on this problem?? Thanks again to everybody! Yeah its called the ford 4.6/5.4 family lol sorry had to say it love fords to death there what keep my bills paid
All, Thank you for the help! I found out that after I changed the COP on Cyl#8 that the new coil i bought from Autozone was no good! Replaced the new one w/ another new one and good to go!!!
I know RiverRat got his/her issue resolved, but I thought I'd add a few comments in case anyone else has the same issue as I'm having. I have a 2001 ford Expedition 4.6L Last week It started running slightly rough, wasn't sure if is was just the bad/bumpy roads or not. Later that day, really bad, then after a stop and go again threw a code P0306 (Misfire Cyl #6). Ok, replaced plug and rubber boot, cleared code, no problem. Yesterday, started running rough again, waited a bit and it threw another code P0308 (Misfir Cyl #8). Alright, what the fsck?! Ok, replaced ALL the plugs (Motorcraft) and boots, used anti-sieze on the threads, and dielectric on the boots. Went for a test drive and is running really rough. finally a preliminary code was thrown - P0308 again * heavy sigh*. If it's not raining too hard (murphys law says it will be), I'll pull and inspect #8 plug, boot, coil. If it looks fine, I'm going to swap the coil on #8 with another cylinder and see if it follows the coil or not. If it does, great! I'll just replace the coil - easy enough fix. If not, I have no clue. Guess I'll try the fuel injector cleaner in the gas tank and see if that helps. In case it is a fuel injector as someone already suggested, how do replace it? When I had the spark plugs out, I really couldn't see how they are installed. Are they threaded into the manifold? How do you disconnect them from the fuel pipe (I couldn't see behind the pipe to see how they are attached)? Sidenote... When I was at Autozone today, I took a quick peek at the manual they had there. Man, is that a 1/2" $25 joke. It had like three paragraphs and a single photo of the entire plenum on changing spark plugs and that was it. If this helps anyone else that comes across this post: This is the cylinder numbering: ----- FIREWALL (windshield) ----- Passenger Side: 4 || 8 Drivers Side Passenger Side: 3 || 7 Drivers Side Passenger Side: 2 || 6 Drivers Side Passenger Side: 1 || 5 Drivers Side ---------- RADIATOR ---------- The bolt holding in the coil on #7 is a bitch to remove/insert because you cannot get a socket directly on top of it as there is a portion of the fuel injector pipe sticking out. What I ended up doing is using a 1/4" short ratchet (apx 4" long) and a 9/32 short socket. the height of the socket was JUST tall enough for the head of the ratchet to clear the top of the coil to be able to engage the head of the bolt. Also, I had to hit Sears (Craftsman) and pick up 3" extension for both 1/4" and 3/8" ratchets, as the 6" extensions I had for both 1/4 and 3/8 drives weren't long enough - you need the whole 9" length to be able to remove the sparks on some cylinders. And no, a 9" extension (if such a thing exists) won't do the job either. You need to have your spark plug socket on the 6" extension, drop it in the hole on top of the spark plug, then once in place, add the 3" extension and your ratchet. Else you'll never be able to get in there as there is just not enough room to fit. I picked up my code reader for $40 from Harbor Freight (but it seems they don't have the same model anymore, but they have sales often so keep checking back once in a while): http://www.harborfreight.com/cpi/ctaf/d ... mber=98568 You can also look at http://HarborFreightUSA.com/ - that is their retail stores website, and they WILL honor the mail order website's sale prices IF you bring in a printed copy of the sale page. NOTE: the retails store DO NOT carry everything that the mail order does, good to call the store ahead of time and ask if they carry an item and to hold it for you. BTW: HF is a cheap, crappy china import tools -buyer beware (keep those receipts) but I've found that many of their electronics seem to be of better quality than their hand/power tools for some odd reason. Well, this is pretty long... I'll post my results after swapping coils around. If anyone has any ideas/suggestions on my ordeal, please feel free to post or PM me.
The injectors are just a push in fit (with an O seal at each end to hold fuel pressure). However you have to remove the fuel rails to pull the injectors out, then you will need some new o seals to be sure of no leaks. You may want to check with a noid light for consistent injector pulses before you pull them off?
Well, I swapped the coilpack from #8 to #1 (which is the easiest to replace) and the problem followed the coil on #1 - threw a code P0301, Replaced the coilpack on #1 and all seems to be going well now - three weeks later. Autozone had the coilpack (which comes with a rubber boot) for $40, no warranty though. Aeroman59, Thanks for the info on the fuel injectors, as well as how to test for good pulse signals.
I hope you didn't get the same "new coil" that Mr RiverRat purchased from the zone as his was junk shortly after installing it. What brand of coil was it?
HI Jeff, It was a "Duralast" iirc, basically Autozone's house brand. It's now May 24, 2010 (0+ days later) and still no problems with the replaced coilpack from Autozone or any other problems. Well, other than a credit card machine has magically replaced the fuel filler! =) Epi
RiverRat wrote: Can somebody please help?!?! I have an 01 F150 4.6 SuperCrew that has popped a P0308 code. I have already changed out all the plugs and the COP on Cyl 8 treated the fuel and changed out the fuel filters. Still no fix. It hesitates and chugs after it has warmed up and when it accelerates. At cruising speed it is fine. Only when i need the horses does it hesitate and chug. Any info or insite would help! we had a 2003 ford with a 5.4 basically same engine in shop last week that was loosing compression on number 8 when it warmed up causeing a misfire code i would check that