Sharky146
Member
- Joined
- May 12, 2020
- Messages
- 65
- Reaction score
- 13
- Points
- 8
- Location
- Virginia Beach, VA
- Vehicle Year
- 2001
- Make / Model
- Ford Ranger XLT
- Engine Type
- 4.0 V6
- Transmission
- Automatic
Hey everyone. Need a little help. I'm getting a Cylinder #5 misfire.
The Truck:
$500 1999 Ranger XLT 3.0L 2WD. Motor was blown, so I replaced it with a junkyard 3.0L from a 2007 Ranger (170k). Used all the top end and wiring harness from my 1999. Just used the block and heads from the 2007. Got it up an running, but could tell that one of the cylinders wasn't firing. I pulled the spark plug wires off the coil pack one by one until I found one that didn't change the sound of the engine running (#5).
Here's what I've done to troubleshoot:
1. Started with all new plugs and wires when I installed the "new" motor.
2. compression checked all cylinders. All 175 psi or above, including #5.
3. Grounded the #5 plug and getting good spark.
4. Swapped the #5 and #1 plug wires at the coil pack (since those two cylinders share the same ignition timing). Number #1 cylinder fires fine using the #5 coil port. #5 cylinder, still dead using the #1 coil port.
5. Swapped in a known-good spark plug into #5 cylinder. Still sparking, but no ignition.
6. Replaced the #5 fuel injector with a new one.
7. Checked the voltage at the number five injector electrical connection and getting good 12 volts.
8. used a stethoscope to determine that the #5 injector is indeed operating (clicking)
9. verified that the fuel rail isn't clogged by pulling out the #5 injector. Plenty of fuel running through the rail.
10. I tried to crank the motor with the fuel rail detached from the intake manifold just to see the injector spray pattern. However, the fuel injectors just get blown off the rail with all the high pressure fuel running to them. So, I wasn't able to check the fuel spray pattern.
11. Right now I've got the upper/lower intake manifolds and valve covers off. Just wanted to make sure that i didn't install the lower intake manifold gasket wrong, which might cause disrupted airflow. It was installed properly.
My thoughts. I feel like i've done everything to check fuel, air and spark. I'm confident that I've got good spark. I feel 95% sure I've got good fuel being delivered to #5. The only thing left is air (compression). I got multiple good compression checks on this cylinder (both hot and cold) and always get 175-180 psi.
Is it possible that the head gasket is blown or block/head is cracked AND still get good compression??
Any thoughts on why #5 isn't firing??
I'm pulling my hair out on this one. I'm considering pulling the heads off and having a look. If the heads and gaskets look good, can I put them back on with new head gaskets, or do I need to have them machined regardless of how they look?
On a positive note, I've got her looking SWEET. New satin black paint and new clear headlights did wonders for her curb appeal!
Thanks in advance for your help. I really appreciate it.
The Truck:
$500 1999 Ranger XLT 3.0L 2WD. Motor was blown, so I replaced it with a junkyard 3.0L from a 2007 Ranger (170k). Used all the top end and wiring harness from my 1999. Just used the block and heads from the 2007. Got it up an running, but could tell that one of the cylinders wasn't firing. I pulled the spark plug wires off the coil pack one by one until I found one that didn't change the sound of the engine running (#5).
Here's what I've done to troubleshoot:
1. Started with all new plugs and wires when I installed the "new" motor.
2. compression checked all cylinders. All 175 psi or above, including #5.
3. Grounded the #5 plug and getting good spark.
4. Swapped the #5 and #1 plug wires at the coil pack (since those two cylinders share the same ignition timing). Number #1 cylinder fires fine using the #5 coil port. #5 cylinder, still dead using the #1 coil port.
5. Swapped in a known-good spark plug into #5 cylinder. Still sparking, but no ignition.
6. Replaced the #5 fuel injector with a new one.
7. Checked the voltage at the number five injector electrical connection and getting good 12 volts.
8. used a stethoscope to determine that the #5 injector is indeed operating (clicking)
9. verified that the fuel rail isn't clogged by pulling out the #5 injector. Plenty of fuel running through the rail.
10. I tried to crank the motor with the fuel rail detached from the intake manifold just to see the injector spray pattern. However, the fuel injectors just get blown off the rail with all the high pressure fuel running to them. So, I wasn't able to check the fuel spray pattern.
11. Right now I've got the upper/lower intake manifolds and valve covers off. Just wanted to make sure that i didn't install the lower intake manifold gasket wrong, which might cause disrupted airflow. It was installed properly.
My thoughts. I feel like i've done everything to check fuel, air and spark. I'm confident that I've got good spark. I feel 95% sure I've got good fuel being delivered to #5. The only thing left is air (compression). I got multiple good compression checks on this cylinder (both hot and cold) and always get 175-180 psi.
Is it possible that the head gasket is blown or block/head is cracked AND still get good compression??
Any thoughts on why #5 isn't firing??
I'm pulling my hair out on this one. I'm considering pulling the heads off and having a look. If the heads and gaskets look good, can I put them back on with new head gaskets, or do I need to have them machined regardless of how they look?
On a positive note, I've got her looking SWEET. New satin black paint and new clear headlights did wonders for her curb appeal!
Thanks in advance for your help. I really appreciate it.