• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

1999 4.0 troubles


Joined
Feb 1, 2010
Messages
11
City
Gray,GA
Vehicle Year
2003
Transmission
Manual
I have a 1999 ford ranger 4x4 with the 4.0 5spd that I bought from a buddy that was having some problems with it. when you crank it up if it has sat for longer than a hour (the longer and colder the worse) it spits and sputters real bad when you first crank it up for about 3-10 seconds, i mean almost cutting off. then it will idle up to about 2000-2500 rpms for about 10 seconds that back to spitin and spurtin... then when im going down the road and i press in the clutch to shift, the rpms stay exactly where they where at, as long as its above 1500 rpm. the rpms will stay there fr about 10-40 seconds before idling down to normal... if i leave the truck in gear and let it get down to about 1000 rpms before i press the clutch then it jumps to 1500 for about 10-15 seconds before idling down. once i get going it runs fine until i press in the clutch.. no issues while my foots in the gas though

to my knowlege the idle air control valve, and fuel filter have been replaced. i heard that it could have a leak on the exhaust side so i put some blue devil in but have not seen a difference at all. im sure more has been replaced but thats all i can think of off the top of my head

im honestly kinda lost. any ideas would be appreciated thanks yall.
 
Last edited:
A lot of times, sputtering at start up is that the fuel pressure has bled down.

Turn the key to Run, do not crank.
Listen for the fuel pump, 2-3 sec.
Turn key Off.
Repeat
Repeat, then crank the starter.

The IAC can be cleaned with carb choke cleaner. Whack it against your hand to make it slide down the shaft, should make a whock sound.

Only other guess is a vacuum leak so spray that carb cleaner around the intake and vac lines. When the idle revs, you found the leak.
 

Sponsored Ad


Sponsored Ad

TRS Events

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Latest posts

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Ranger Adventure Video

TRS Merchandise

Follow TRS On Instagram

TRS Sponsors


Sponsored Ad


Sponsored Ad


Amazon Deals

Sponsored Ad

Back
Top