Go Back   F150online Forums > Powertrain & Mechanical > V8 Engines
Sign in using an external account
Register Forgot Password?


Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
  #1  
Old 02-22-2010, 10:20 PM
Junior Member
 
Join Date: Oct 2009
Vehicle: 1998 Ford F 150
Posts: 6
1998 F150 4.6 Triton V8 cylinder misfire

1998 F150 cylinder misfire - I have an incredibly frustrating problem. My old girl seems to like to have misfires with cylinder 7 - has anyone had this problem? It is always cylinder 7 - I have replaced both coil packs, plugs, wires, egr, injectors, fuel filter, fuel pump etc. I have realized through other posts that FoMoCo has made life simple if we just purchase OEM parts. I will try that when I purchase my new parts.

But, why is it always cylinder 7 that has issues. I checked my plug gap after I replaced all plugs. I have maybe 3,000 miles on the new plugs and cylinder 7 gap was .65 - i regapped to .54 and she seems to run better (for now) what causes the gap to blow out like that?

When I was leaving my friendly neighborhood parts store after they read my codes for free :-) - the truck bucked and spat like an angry imp - the dash lights went out. I threatened the truck with a car crusher and I was able to get her home.

After tenuously checking and replacing every relevant fuse (which were perfect and not blown) for the dash lights, I also noticed during testing that the parking lights do not work now.

The other accessories that are linked with the not blown fuses work fine. I am confused (again) as to what has gone wrong with the parking lights and the dashboard.

Any helpful advice would be appreciated. I love my truck and have 145,000 miles on her. But she is starting to wear on my nerves with all the hoopla she is causing.

I would hate to have to buy a Chevy

Thanks in advance
Reply With Quote
  #2  
Old 02-22-2010, 10:30 PM
Senior Member
 
Join Date: Jun 2007
Location: Utah
Vehicle: 1999 Ford F-150 5.4
Posts: 5,168
what kinda plugs are you using? Modulars are pretty picky about the plugs.. they only like motorcraft ngk and denso's really.. #7 is prone to getting road water spashed on it especially if the shield that attaches to the inner fender is missin..
__________________

1999 F-150 xlt 5.4 4x4
1971 Mach 351c 5 speed TKO600 Tremac-sold!
Reply With Quote
  #3  
Old 02-22-2010, 10:43 PM
Junior Member
 
Join Date: Oct 2009
Vehicle: 1998 Ford F 150
Posts: 6
Thank you for your help - I have NGK installed - I have the inner shield still in great condition. I did notice some wetness so I will check the shield better. Did you have any idea as to why the gap would open up so greatly? I am going to order new OEM wires and fresh motorcraft plugs. Are you aware of any place online or store where I can get them cheaper than the dealer. Going to the dealer is dangerous as they have nice new trucks there..........
Reply With Quote
  #4  
Old 02-22-2010, 10:47 PM
Senior Member
 
Join Date: Jun 2007
Location: Utah
Vehicle: 1999 Ford F-150 5.4
Posts: 5,168
Quote:
Originally Posted by itw69fxst View Post
Thank you for your help - I have NGK installed - I have the inner shield still in great condition. I did notice some wetness so I will check the shield better. Did you have any idea as to why the gap would open up so greatly? I am going to order new OEM wires and fresh motorcraft plugs. Are you aware of any place online or store where I can get them cheaper than the dealer. Going to the dealer is dangerous as they have nice new trucks there..........
last I saw the motorcraft plugs were 2.99 at Rockauto.com.
Reply With Quote
  #5  
Old 02-22-2010, 10:47 PM
Senior Member
 
Join Date: Jun 2007
Location: Utah
Vehicle: 1999 Ford F-150 5.4
Posts: 5,168
they also carry motorcraft wires at a discount..
__________________

1999 F-150 xlt 5.4 4x4
1971 Mach 351c 5 speed TKO600 Tremac-sold!
Reply With Quote
  #6  
Old 02-22-2010, 10:51 PM
Junior Member
 
Join Date: Oct 2009
Vehicle: 1998 Ford F 150
Posts: 6
thank you for your assistance, I shall purchase these items and see if magic happens.
Reply With Quote
Old 02-22-2010, 10:51 PM


 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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 On
Refbacks are Off


All times are GMT -4. The time now is 01:43 PM.





This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company
 
Contact Us Advertising Privacy Statement Terms of Service Jobs Forum Text Archives
Emails & Contact Details