04yfzkid
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- Jan 25, 2008
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Hi guys. I haven't posted much on here because just about every question I can find the answer to by searching through google. I've done that this time for hours, tried all kinds of interesting fixes and, still no luck.
Backstory:
After blasting through the desert for an hour or so, we usually stop for a beverage and take in the sights. Every time I would start the truck to leave, it would run on 2 cylinders and eventually pick up to run "normal". Normal is idle that likes to hang for a while before coming down. 4-5 4.0 rangers I've had drove like this.
As I got ready for a recent desert trip I drove it 40 miles to a gas station near my buddies shop. Filled up about 30 gallons of fuel (42ish gallon tank). Of course when I started it, ran on 2 cylinders for 30 seconds, picked up and I was on my way. After being at my buddies shop for 30 minutes I went to move the truck. Would only run on 2 cylinders and wouldn't pick up. Reset the computer, and still nothing. After about 10 minutes of playing with it, it picked up some more cylinders but not all of them. Decided to leave it at home and hitch rides all weekend.
Once I got home I started to do the usually spraying brake clean everywhere, pull plug wires and see if that cylinder is dead or not, ect. Was fed up with the brake clean so I sprayed a ton down in intake to see if it would change the idle. To my surprise the stuff we were using did not. Anyways, pulled the upper intake manifold off and found that all cylinders BUT #5 were wet still with the brake clean. Weird.
Decided to pull the motor because I'd rather work on it on the stand, and had solid motor mounts to install. Once I pulled the lower intake off, I was confused. Both the intake manifolds had carbon build up in ALL the cylinders. However the head had carbon build up in every cylinder but #5 as you can see in the picture below.
Here is what has been replaced during this ordeal:
Intake Manifold Gaskets (felpro)
Valve Cover Gaskets (felpro)
Spark Plugs gaped at .054 (motorcraft)
Wires (motorcraft)
PCV valve (motorcraft)
Coolant temp sensor for the computer (motorcraft)
Fuel pump was swapped for a new one (duralast)
Fuel Injectors, re-manufactured
Fuel Filter (motorcraft)
Oil Pressure Sensor (still pegs the gauge) (motorcraft)
EGR DPFE sensor, had a code for excessive flow
EGR solenoid sensor, not sure the actual name
MAF sensor is 500 miles old, behind a UMP filter, and it was cleaned (duralast)
As of right now it has a minor miss through the mid-range free reving it. Under a load it's a considerable miss until about 3,500 rpms. Appears to have lost power after that.
Tested:
Fuel pressure holds steady at 30psi and does not fluctuate under load. Goes up with throttle position
TPS appears to be linear but occasionally did weird stuff. I couldn't tell if it was my movements though.
Swapped a brand new coil, no change. Cleaned the old coil, and added an extra ground to one of the bolts with change.
Long Term Fuel Trims show 25%.
After about a dozen test drives (maybe 5 total miles) it popped a cylinder #5 misfire.
I'm stumped at this. Any suggestions? Going to try a good TPS in the morning when I return the new coil.
Picture of the odd cylinder 5 cleanliness
I live on backroads, it was safe
and the truck you're helping me fix
Backstory:
After blasting through the desert for an hour or so, we usually stop for a beverage and take in the sights. Every time I would start the truck to leave, it would run on 2 cylinders and eventually pick up to run "normal". Normal is idle that likes to hang for a while before coming down. 4-5 4.0 rangers I've had drove like this.
As I got ready for a recent desert trip I drove it 40 miles to a gas station near my buddies shop. Filled up about 30 gallons of fuel (42ish gallon tank). Of course when I started it, ran on 2 cylinders for 30 seconds, picked up and I was on my way. After being at my buddies shop for 30 minutes I went to move the truck. Would only run on 2 cylinders and wouldn't pick up. Reset the computer, and still nothing. After about 10 minutes of playing with it, it picked up some more cylinders but not all of them. Decided to leave it at home and hitch rides all weekend.
Once I got home I started to do the usually spraying brake clean everywhere, pull plug wires and see if that cylinder is dead or not, ect. Was fed up with the brake clean so I sprayed a ton down in intake to see if it would change the idle. To my surprise the stuff we were using did not. Anyways, pulled the upper intake manifold off and found that all cylinders BUT #5 were wet still with the brake clean. Weird.
Decided to pull the motor because I'd rather work on it on the stand, and had solid motor mounts to install. Once I pulled the lower intake off, I was confused. Both the intake manifolds had carbon build up in ALL the cylinders. However the head had carbon build up in every cylinder but #5 as you can see in the picture below.
Here is what has been replaced during this ordeal:
Intake Manifold Gaskets (felpro)
Valve Cover Gaskets (felpro)
Spark Plugs gaped at .054 (motorcraft)
Wires (motorcraft)
PCV valve (motorcraft)
Coolant temp sensor for the computer (motorcraft)
Fuel pump was swapped for a new one (duralast)
Fuel Injectors, re-manufactured
Fuel Filter (motorcraft)
Oil Pressure Sensor (still pegs the gauge) (motorcraft)
EGR DPFE sensor, had a code for excessive flow
EGR solenoid sensor, not sure the actual name
MAF sensor is 500 miles old, behind a UMP filter, and it was cleaned (duralast)
As of right now it has a minor miss through the mid-range free reving it. Under a load it's a considerable miss until about 3,500 rpms. Appears to have lost power after that.
Tested:
Fuel pressure holds steady at 30psi and does not fluctuate under load. Goes up with throttle position
TPS appears to be linear but occasionally did weird stuff. I couldn't tell if it was my movements though.
Swapped a brand new coil, no change. Cleaned the old coil, and added an extra ground to one of the bolts with change.
Long Term Fuel Trims show 25%.
After about a dozen test drives (maybe 5 total miles) it popped a cylinder #5 misfire.
I'm stumped at this. Any suggestions? Going to try a good TPS in the morning when I return the new coil.
Picture of the odd cylinder 5 cleanliness
I live on backroads, it was safe
and the truck you're helping me fix