5.4 Triton misfiring after complete tune up. - Ford Truck Enthusiasts Forums



5.4 Triton misfiring after complete tune up.

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 09-03-2010, 11:29 AM
mossberg500 mossberg500 is offline
New User
Thread Starter
 
Join Date: Sep 2010
Posts: 3
mossberg500 is starting off with a positive reputation.
5.4 Triton misfiring after complete tune up.

ok guys, bear with me. had my 2001 f150, 108k tuned up 3 weeks ago by former ford tech of 25 years. he replaced all coils, plugs, fuel & air filters, cleaned fuel rails, sensors. used all motorcraft parts. truck ran great for 3 days, then misfired bad. he as well as local dealer checked injector flow & compression, all ok. they have replaced #7 coil & plug and #7 injector twice over. PCM has been reset. still misfires. #7 usually seems to be the favorite. it's been on a WDS machine, found nothing. what's the next step??? anybody, somebody???????????
Reply With Quote
  #2  
Old 09-03-2010, 08:33 PM
LxMan1's Avatar
LxMan1 LxMan1 is offline
Moderator
 
Join Date: Dec 2001
Location: Louisville,Ky.
Posts: 22,387
LxMan1 has a brilliant futureLxMan1 has a brilliant futureLxMan1 has a brilliant futureLxMan1 has a brilliant futureLxMan1 has a brilliant futureLxMan1 has a brilliant futureLxMan1 has a brilliant futureLxMan1 has a brilliant futureLxMan1 has a brilliant futureLxMan1 has a brilliant futureLxMan1 has a brilliant future
Bad connection at the coil? Perhaps the plug is corroded causing a weak signal to the coil or there is a bad spot in the wire.
Reply With Quote
  #3  
Old 09-04-2010, 09:55 AM
mossberg500 mossberg500 is offline
New User
Thread Starter
 
Join Date: Sep 2010
Posts: 3
mossberg500 is starting off with a positive reputation.
5.4 misfire after tune up

thnaks, i'll check. all plugs & coils are new, including boots. threw code for #1 cylinder yesterday, changed plug & coil again. trucks running great now but for how long don't know. it's like chasing a ghost.
Reply With Quote
  #4  
Old 09-04-2010, 10:09 AM
02FX45.4 02FX45.4 is offline
Junior User
 
Join Date: Aug 2010
Location: Illinois
Posts: 80
02FX45.4 is starting off with a positive reputation.
Swap the coil and plug from #7 to a different cylinder. See if the problem travels with the coil and plug. If it does then move the coil to another and go from there. If it follows the coil then the coil is bad, if it doesn't the plug is bad, if it stays on #7 you may be taking the harness apart looking for a break or possibly a computer problem. I just tuned mine up and had a missfire on #1........I felt like a DA when I took the plug and coil out to find the gap of the plug was closed.
Reply With Quote
  #5  
Old 09-04-2010, 02:09 PM
mossberg500 mossberg500 is offline
New User
Thread Starter
 
Join Date: Sep 2010
Posts: 3
mossberg500 is starting off with a positive reputation.
5.4 with misfire after tune up

tried the swap a few times. computer was reset by dealer. #7 cylinder has the 4th new coil & is ok. my personal ford mechanic changed coils all around twice. i'm wondering if motorcraft has or had a bad batch of coils they didn't pull. i'd like to talk to a rep about that. i pulled my boat with her today & she never missed a lick, i'm hoping the goat rodeo is over.
Reply With Quote
  #6  
Old 12-22-2017, 11:23 PM
john coffey john coffey is offline
New User
 
Join Date: Dec 2017
Posts: 3
john coffey is starting off with a positive reputation.
Quote:
Originally Posted by mossberg500 View Post
ok guys, bear with me. had my 2001 f150, 108k tuned up 3 weeks ago by former ford tech of 25 years. he replaced all coils, plugs, fuel & air filters, cleaned fuel rails, sensors. used all motorcraft parts. truck ran great for 3 days, then misfired bad. he as well as local dealer checked injector flow & compression, all ok. they have replaced #7 coil & plug and #7 injector twice over. PCM has been reset. still misfires. #7 usually seems to be the favorite. it's been on a WDS machine, found nothing. what's the next step??? anybody, somebody???????????
compression test it
Reply With Quote
  #7  
Old 12-22-2017, 11:23 PM
john coffey john coffey is offline
New User
 
Join Date: Dec 2017
Posts: 3
john coffey is starting off with a positive reputation.
Quote:
Originally Posted by john coffey View Post
compression test it
nevermind I see you did that already
Reply With Quote
  #8  
Old 12-22-2017, 11:25 PM
john coffey john coffey is offline
New User
 
Join Date: Dec 2017
Posts: 3
john coffey is starting off with a positive reputation.
Quote:
Originally Posted by john coffey View Post
compression test it
try temp sensors look for a code p0345 or three 09
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Help.... chugging etc. crowncrazy87 1997 - 2003 F150 2 05-20-2016 09:08 AM
2008 misfire diagnosis help? Arctic AL 2004 - 2008 F150 1 03-23-2016 07:30 PM
1999 5.4 random misfire, chasing my tail Bootlegger's Deluxe Modular V8 (4.6L, 5.4L) 2 03-12-2016 09:51 PM
Misfire under load? NMSOLRBACON 1999 to 2016 Super Duty 2 03-10-2016 10:24 PM
#3 cylinder misfire no code JimmySelf1 1999 to 2016 Super Duty 17 02-08-2016 01:36 PM


Go Back   Ford Truck Enthusiasts Forums >

Tags
54, 54l, bad, coils, complete, ford, misfire, misfiring, missfire, triton, truck, tsb, tune, v10, v8

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 07:09 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.