random power loss
Thread Starter
|
Tuned
Joined: Apr 2011
Posts: 292
Likes: 1
From: Cary, NC
random power loss
Hi Team - I have a new to me 78 Ranger with the inline 6 4 speed. love cruising around town with it. Few days ago, it started to stumble in 4th gear. it will die out and come back, die out and come back. it will do that repeatedly until you slow down or stop, then will run normal again for a good while before it repeats the loss of power again. Obviously it's fuel related. I installed a new tank and lines last month. has a new fuel filter so I can rule out junk in the tank and lines. I ordered a fuel pressure gauge, and a new mechanical pump. just want to make sure I'm on the right path. if not that, it would have to be carb, but it feels like a fuel pump issue to me.
Mountain Pass
Joined: Aug 2024
Posts: 201
Likes: 84
From: Queensland Australia
It may' be the coil, an old weak coil will often allow the engine to start and be driven for a while until it heats up and under load low revs in 4th gear as you are finding break down, voltage drop as load on engine increases, it may rev up ok in neutral but when more voltage is required ie loading it starves the distributor's ability to deliver enough spark, much like fuel starvation in effect.
Just try another coil and maybe check the HV coil lead to distributor.
trust this helps
regards Ross
Just try another coil and maybe check the HV coil lead to distributor.
trust this helps
regards Ross
Lead Driver
Joined: Oct 2018
Posts: 7,845
Likes: 2,353
If you can get it to want to die , shut it off and cost over to the side of the road. pull the air cleaner lid and see if it squirts fuel out of the accelerator pump. this will tell you if it's fuel or spark.
most likely it's the carburetor I'd just go there now.
most likely it's the carburetor I'd just go there now.
Thread Starter
|
Tuned
Joined: Apr 2011
Posts: 292
Likes: 1
From: Cary, NC
Thank you team. I have the pump and parts coming already. I'll order coil too, if those dont fix, I'll look into the switch. Appreciate the help. it's been a while since I've been carbonated. but at least everything is easy to get to.
Cargo Master
Joined: Jul 2005
Posts: 2,309
Likes: 364
From: Kansas
did the problem occur prior to swapping the tank?
when the problem occurs, remove the gas cap and see if there is a vacuum built up in the tank.
when the problem occurs, remove the gas cap and see if there is a vacuum built up in the tank.
Trending Topics
Lead Driver
Joined: Oct 2018
Posts: 7,845
Likes: 2,353
Good suggestion.
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
Thread Starter
Forum
Replies
Last Post
Malachai Styxx
1994.5 - 1997 7.3L Power Stroke Diesel
15
Nov 20, 2024 04:44 PM
fatazz350
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
7
Oct 16, 2021 09:23 PM
DBAPilotDad
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
31
Jun 24, 2008 09:14 PM