460EFI driving me nuts!
Thread Starter
|
Junior User
Joined: Mar 2013
Posts: 63
Likes: 0
460EFI driving me nuts!
82k miles....I've replaced all vacuum lines, plugs, fuel filters, air filter, no cat, ran injector cleaner, and plug wires. It started missing and shuttering under load. Swapped plug wires and it worked perfect. Took it from PA to NC Saturday and it startes again. Hit an Autozone and they had cheap wires and Accel 8mm so I got them, and an msd cap and rotor (replaced this twice too.) Built wires in the parking lot and hit the road....was good for maybe 200 milesand its doing it again. Does it when under a load or at higher speeds (above 2k rpm and 70mph). Forgot to mention it has an msd coil. I'm going to put the stock coil back on it but I doubt that's the issue. Any ideas?
Posting Guru
Joined: Jul 2011
Posts: 1,219
Likes: 2
From: Elk City, OK
I'm assuming it's the centurion in your sig? What kind of trans?
You said it happens under load. Does it stop after it shifts and the rpm drops? Are you POSITIVE you put the plug wires back on in the right order? Did you take off all the plug wires at once or did you replace them one at a time?
You said it happens under load. Does it stop after it shifts and the rpm drops? Are you POSITIVE you put the plug wires back on in the right order? Did you take off all the plug wires at once or did you replace them one at a time?
Thread Starter
|
Junior User
Joined: Mar 2013
Posts: 63
Likes: 0
Trans is an E4OD. Trans is good. Its definitely ignition. Its mostly a hard skip when it does it but it comes across as a vibration when at steady higher throttle demand. But as soon as you pedal it for more power it starts to skip. Plug wires were one at a time every time.I'm in Centre Hall
Thread Starter
|
Junior User
Joined: Mar 2013
Posts: 63
Likes: 0
Oh and yep, its the one in my sig. Truck sat a lot if you can't tell by mileage. Guy parked it inside from October to April every year. Its given me lots of fits from sitting. Oh it has a new O2 sensor too. All parts needed replacement due to failure/age. Some I did twice because it acted like it was the issue. People have said on these that plug wires touching could cause this too...I routed them all so they don't touch. Closest they get is at the cap and where some are in plastic clip looms to keep them apart
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
I had this once on my 460. It was the that the plug wire on one cylinder keep coming loose but not off. You can check the voltage on the plug wire while at idling and the one with the high voltage is the one that is loose but not off.
That is how I found the one doing it. Crimped it a little and it has stayed on for a while now.
It started doing it on mine when I replaced the plug wires. I think dielectric grease may have had something to do with the wire backing away from the plug. I also replaced that plug wire and put it on without the dielectric grease and wiped the plug clean.
That is how I found the one doing it. Crimped it a little and it has stayed on for a while now.
It started doing it on mine when I replaced the plug wires. I think dielectric grease may have had something to do with the wire backing away from the plug. I also replaced that plug wire and put it on without the dielectric grease and wiped the plug clean.
Thread
Thread Starter
Forum
Replies
Last Post
Ddaybc
1987 - 1996 F150 & Larger F-Series Trucks
36
Sep 5, 2015 08:05 PM
GammaDriver
1997 - 2003 F150
8
Jul 10, 2006 01:46 AM
