Heavy Miss When Warm
Thread Starter
|
Senior User
Joined: Jan 2010
Posts: 257
Likes: 0
From: Templeton, Ca
Heavy Miss When Warm
92 F150, 5.0 automatic. When the truck is cold first thing in the morning it runs fine. Once it gets up to temp it gets a really bad miss no matter what the temp is outside. It has yet to die though, just runs super rough and doesnt smooth out when accelerating. I dont find any vac leaks and no CEL. Recently got new plugs, wires, cap, coil and the EGR was recently cleaned. Ran fine after parts replacement and then one day it started running rough out of the blue. Any ideas?
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
I'd check what your fuel pressure is doing when it's warmed up. Smooth cold starts, but rough when warm make me think coolant temperature sensor, however. Oxygen sensor is another possibility too.
More Turbo
Joined: Nov 2014
Posts: 686
Likes: 11
From: Plainfield, IN
Like Lead Head said, change your O2 sensor. My 88 with 5.0 had the exact symptoms of your truck. I found a Denso O2 sensor on EBay for $19 with free shipping. Removed, replaced, and truck is running good again.
More Turbo
Joined: Nov 2014
Posts: 686
Likes: 11
From: Plainfield, IN
You might check the PIP sensor (stator) in the distributor for faults or the ECM for leaking capacitors. What brand name cap did you install?
Trending Topics
Senior User
Joined: Jul 2011
Posts: 129
Likes: 0
TPS sensor.
Failing Injector, my '92 was driving me nuts. It was a handful of things. TPS, manifold temp sensor, and two bad injectors.
Failing Injector, my '92 was driving me nuts. It was a handful of things. TPS, manifold temp sensor, and two bad injectors.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
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
Thread
Thread Starter
Forum
Replies
Last Post
annaleigh
1968-Present E-Series Van/Cutaway/Chassis
8
Jan 20, 2018 09:59 PM
Capt17
1987 - 1996 F150 & Larger F-Series Trucks
8
May 13, 2008 10:06 PM