5.0 running rough.
Thread Starter
|
Elder User
Joined: May 2003
Posts: 575
Likes: 0
From: Orlando, FL
5.0 running rough.
Started a while ago and I posted in the Big Bronco forumn with little luck, no offense kemicalburns I just thought I might get more responses here.
1990 5.0 in a Bronco. Starts fine and idles and runs great for about 30 seconds to a minute. Then it starts to vibrate somewhat like it is only firing on 7 cylinders. This vibration continues throughout the rpm range as I drive. This occurs with and without the air conditioning on.
What I have done so far. New Autolite Copper Plugs, new Accel 8mm wires, new cap and rotor, timming at 10* btdc, new fuel filter.
Pulled code 31 from continuous memory.
Any Ideas.
1990 5.0 in a Bronco. Starts fine and idles and runs great for about 30 seconds to a minute. Then it starts to vibrate somewhat like it is only firing on 7 cylinders. This vibration continues throughout the rpm range as I drive. This occurs with and without the air conditioning on.
What I have done so far. New Autolite Copper Plugs, new Accel 8mm wires, new cap and rotor, timming at 10* btdc, new fuel filter.
Pulled code 31 from continuous memory.
Any Ideas.
Thread Starter
|
Elder User
Joined: May 2003
Posts: 575
Likes: 0
From: Orlando, FL
No I havn't had much time lately to work on it. It still runs and drives so Last night I went to a dealership looking for a good used truck. When I got done driving interstate for about 30 mins it was running great again. Go figure, it runs fine after I threaten to replace it with a new daily driver.
Postmaster
Joined: Jun 2005
Posts: 2,656
Likes: 1
Trending Topics
Logistics Pro
Joined: Aug 2005
Posts: 3,884
Likes: 180
From: Morgan Hill, CA
Try cleaning the throttle body and any EGR stuff next to it. My bro's 90 GT was doing the same thing and he cleaned it up pretty good and it helped a lot.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread Starter
|
Elder User
Joined: May 2003
Posts: 575
Likes: 0
From: Orlando, FL
Ok, I know I am a bad listener because I haven't had any timie since I first posted this to try any of the suggestions above, BUT I have anther question first.
Since I first posted I have noticed that the truck runs fine as long as I don't get the motor above 2,000 RPM's. However, once it is above 2000 RPM's the vibration starts and wont stop until I turn the truck off for a while.
Hopefully this narrows down the solutions?
Since I first posted I have noticed that the truck runs fine as long as I don't get the motor above 2,000 RPM's. However, once it is above 2000 RPM's the vibration starts and wont stop until I turn the truck off for a while.
Hopefully this narrows down the solutions?
Posting Guru
Joined: Nov 2004
Posts: 2,155
Likes: 1
From: sunny fla sometimes windy
At night take a spray bottle with water in it, spray down the plug wires from dist. to plugs, start the truck turn off all lights, look around for sparks jumping wire to wire and from wire to metal on the motor or frame or to low voltage wires(bad bad bad if it's sparking to sensor wires!!!). If you see quite a few sparks you need to either reroute the wires, install more seperators or put split loom over the wires. Definately triple dose it with dedicated gas line dryer get both types isopropyl and methanol dump it in 1/2, 1/4 tank whatever dump in 2 bottles of each run it until almost empty, refill with fresh gas and 2 bottles of iso-heet. A bottle every oil change won't break the bank and could prevent future problems!! My vote is for cross firing plug wires or it could be jumping to a sensor wire intermittantly and screwing with it!!
Thread
Thread Starter
Forum
Replies
Last Post
mel63
Explorer, Sport Trac, Mountaineer & Aviator
3
Sep 13, 2007 07:45 PM
