Rough Running 1986 5.0
Thread Starter
|
New User
Joined: Dec 2007
Posts: 2
Likes: 0
Rough Running 1986 5.0
I have a 86 5.0 bronco that runs very rough. It starts up great and does not idle, if it does idle and doesnt stall it revs up and down. When i give it gas it misses and loses power, it feels like the engine is missing and falls on its face. This started shortly after i put a fuel additive in it and ive ran at least 1/2 tank of gas since. i have changed the spark plug wires, dist. cap, new plugs with proper gap, checked all cylinder pressure(128-134 on all), fuel rail pressure(constant 30), fuel filter changed, and disconnected battery to try to reset the idle. I also ran a cleaner through the fuel rail but the pressure is good. ideas would be great on fixing my bronco.
Confused!!
Confused!!
Posting Guru
Joined: Nov 2004
Posts: 2,155
Likes: 1
From: sunny fla sometimes windy
What is the fuel pressure Koeo and koer and revved at about 2000rpm? What kind of
fuel additive did you use? And how long does the truck sit or had it sat before this
started? Try to unplug the IAC wire and start it, It should be barely running at about
500 rpm or so. Don't replace components without testing them first let us know what
happens and if you have a multimeter you can check everything and save alot of money.
fuel additive did you use? And how long does the truck sit or had it sat before this
started? Try to unplug the IAC wire and start it, It should be barely running at about
500 rpm or so. Don't replace components without testing them first let us know what
happens and if you have a multimeter you can check everything and save alot of money.
Thread Starter
|
New User
Joined: Dec 2007
Posts: 2
Likes: 0
I am fairly new with working on the bronco so bare with me. i looked into the iac and the only info i could find was for carbureted engines, mine is fuel injection. is there still an iac for this? when its at idle the preasure on the fuel rail is 30, when i bring the idle up or it starts to die it shoots to around 35. the fuel additive was to take the water out of the fuel because it was getting cold, and it was not setting for any period of time. thanks and keep ideas coming.
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
go to www.fordfuelinjection.com all the info you could possibly need regarding your setup and how to scan for codes etc..
Fleet Mechanic
Joined: Jan 2005
Posts: 1,413
Likes: 14
From: cape may county NJ
[QUOTE=SMOKINDZIO]I am fairly new with working on the bronco so bare with me. i looked into the iac and the only info i could find was for carbureted engines, mine is fuel injection.
Yes I know its fuel injected its just like my 86 f-150 and have been there before that why I asked the ? I did.also you did not say how it will run at a steady speed!
Yes I know its fuel injected its just like my 86 f-150 and have been there before that why I asked the ? I did.also you did not say how it will run at a steady speed!
Last edited by GlennFordx4; Dec 21, 2007 at 05:45 AM. Reason: added words
Trending Topics
Fleet Mechanic
Joined: Jan 2005
Posts: 1,413
Likes: 14
From: cape may county NJ
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
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
Posting Guru
Joined: Nov 2004
Posts: 2,155
Likes: 1
From: sunny fla sometimes windy
The IAC is the solenoid looking deal with the diamond shaped mounting plate and two
bolts. Take it off while holding the solenoid deal up spray the valve deal with plenty
of carb cleaner, Make the valve move twist it around to get all sides. You should be
able to tell when it is clean but don't be afraid to use a half can or so!! Do not let the
crudded up carb cleaner run into the solenoid deal and if you clean the TB take it off
or you may fry the TPS on the bottom of the TB!! Reinstall with rtv or three bond and
antisieze on the threads because it will need to be done again and you don't want the
\threads to sieze up.
bolts. Take it off while holding the solenoid deal up spray the valve deal with plenty
of carb cleaner, Make the valve move twist it around to get all sides. You should be
able to tell when it is clean but don't be afraid to use a half can or so!! Do not let the
crudded up carb cleaner run into the solenoid deal and if you clean the TB take it off
or you may fry the TPS on the bottom of the TB!! Reinstall with rtv or three bond and
antisieze on the threads because it will need to be done again and you don't want the
\threads to sieze up.
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
Originally Posted by SMOKINDZIO
checked all cylinder pressure(128-134 on all)
