2003 Ford Ranger 3.0 80K miles: this problem started spontaneously last week, with no recent repairs or maintenance to cause it. It’s getting worse every day. It started as the engine
knocking during acceleration. Then a squealing or whistling noise started during acceleration which is growing louder and more constant. The truck will barely climb a hill now. It is dangerously gutless in traffic.
Symptoms and codes:
Runs well for a few minutes when the engine is cold. Then it starts to misfire and knock when accelerating or climbing hills.
There is a squealing noise coming from the area right behind the AC compressor
, around the #4 cylinder head. There are no vacuum hoses there.
Misfire on startup
Cylinder 5 misfire
System too lean (bank 1)
System too rich (bank 2)
Random multiple misfire
Cylinder 4 misfire
Cylinder 5 misfire
I Googled the problem and this other guy described the symptoms EXACTLY! He’s already thrown a lot of money at it; he’s done the obvious stuff with no results. The reply he got was not too helpful. Since one guy has the exact same problem, I’m hoping that a Ford specialist will have had some experience with it and be able to nail it.
Here’s what Google turned up:
03-30-2009, 06:39 PM
I have a 2003 ford ranger 3.0 V6 right now it has codes for # XXXXX and 6 cylinder misfire and also random misfire. it has All new injectors plugs wires the upper plastic intake manifold has been replaced a long with the gaskets when the motor gets to about 2500 rpm you can hear a squealing sounds i thought it might have been an intake leak but like i said the intake manifold and the gaskets are new any ideas??
03-31-2009, 05:51 PM
Ohm all the injectors any that are way out of line replace. I've used a small screwdriver with a light bulb in the handle slide the tip along side the wire and check for spark on all cylinders. I've also used an ohm meter and checked the wires it normally runs appx. 1/2 scale.
Take a compression test a bad lifter or valve can cause problems.
Use a can of carb. cleaner and spray along the edges of the intake manifold.
If the engine smooths out you have a leak at this point. Its always possible a gasket is pinched or you have a small crack.
Bad injector wires also cause misfires.
I have a 2000 ford ranger xlt 3.0 v6 I am having a cylinder 4 misfire. I replaced all plugs wires and vertical coil pack still getting same problem any help? Thanks in advance