P304 & P316 Codes 2004 Ranger 3.0L
Thread Starter
|
Member
Joined: Nov 2016
Posts: 2
Likes: 0
From: Houston, TX
P304 & P316 Codes 2004 Ranger 3.0L
Good afternoon everyone,
I have a 2004 Ford Ranger Edge with a 3.0L Engine. I have had the truck for the last 7 or 8 years and gotten it to just about 205,000 miles.
Over the last month or so I have been getting the P304 and P316 check engine codes. For some reason, ever since I bought it, the ignition coil goes out every year. I bought one from Autozone a long time ago with a lifetime warranty and usually when I get a miss fire code, that's the issue. This time however is different.
I swapped out the coil first, hoping that was all it was. Didn't fix it.
Next I swapped out the spark plugs and spark plug wires (last time I did this was about 4 years ago). Didn't fix it either.
It has stayed consistent with the P304 and P316, so next I swapped out the fuel injector. Since that side was hard to get to, and the old injectors were the original ones that it came with, and pretty dirty, I went ahead and replaced all 3 on that side. I could tell the engine ran a little better, but it still didn't fix the problem.
Next I will do a compression test. Is there anything I am missing along the way? This truck has been very good to me over the years, and I kinda want to see it get to 300,000.
I have a 2004 Ford Ranger Edge with a 3.0L Engine. I have had the truck for the last 7 or 8 years and gotten it to just about 205,000 miles.
Over the last month or so I have been getting the P304 and P316 check engine codes. For some reason, ever since I bought it, the ignition coil goes out every year. I bought one from Autozone a long time ago with a lifetime warranty and usually when I get a miss fire code, that's the issue. This time however is different.
I swapped out the coil first, hoping that was all it was. Didn't fix it.
Next I swapped out the spark plugs and spark plug wires (last time I did this was about 4 years ago). Didn't fix it either.
It has stayed consistent with the P304 and P316, so next I swapped out the fuel injector. Since that side was hard to get to, and the old injectors were the original ones that it came with, and pretty dirty, I went ahead and replaced all 3 on that side. I could tell the engine ran a little better, but it still didn't fix the problem.
Next I will do a compression test. Is there anything I am missing along the way? This truck has been very good to me over the years, and I kinda want to see it get to 300,000.
Welcome to the forum
TSB for that here
Apparently the exhaust valve seats would start to recess into the head, wrong size or poor material, was never confirmed, but it is a real issue.
And it didn't happen under warranty usually, 150k + miles, but seems you were having symptoms earlier, yes new coil and spark plugs could have helped with just a little compression loss.
Yes, compression test may show lower numbers on #4.
Dry then Wet Leak down test may be needed as well.
Heads can now be rebuilt, but new/refurbished heads can be quicker
TSB for that here
TSB 05-26-3
FORD: 2004-2006 Ranger
ISSUE
Some 2004-2006 Rangers 3.0L-2V "Vulcan"vehicles may exhibit:
- Malfunction indicator lamp (MIL) on with diagnostic trouble codes (DTCs) P0300-P0306 and P0316
- Rough running at various RPM
- Rough idle
- Misfire
ACTION
This may be due to an engine exhaust valve seat recession causing a loss of compression. Refer to the following Service Procedure to diagnose exhaust valve seat recession.
SERVICE PROCEDURE
1. Perform a power balance rest to clarify if a cylinder is misfiring. Identify and keep record of any cylinder that has a concern.
2. Perform a manual compression test with the spark plugs removed to locate any cylinder that may have low compression. Refer to the appropriate Workshop Manual, Engine System, General Information, 303-00.
3. If no low compression is found per shop manual instructions, proceed with normal misfire diagnostics per the Powertrain Controls/Emissions Diagnosis (PC/ED) Manual for the appropriate model year.
4. If low compression is found and it is a cylinder that had a misfire on power balance, perform a leakdown test to determine the source of leakage that may be causing the low compression. Refer to the appropriate Workshop Manual, Engine System, General Information, 303-00.
5. If low compression is found in a cylinder that did not have a misfire detected then proceed with normal base engine diagnostics per the Workshop Manual, Engine System, General Information, 303-00.6.
If the exhaust valve is identified as the source, replace both cylinder heads with the newly released service cylinder heads. Refer to the appropriate Workshop Manual, Section 301-01A.
PART NUMBER / PART NAME
6U7Z-6049-A / Cylinder Head Assembly
2F1Z-6079-BB / Upper Gasket Kit
F8 DZ-6065-AA / Cylinder Head Bolts
F7DZ-9448-BB / Engine Exhaust Gasket
4F1Z-658-AA / Valve Cover Gasket
F6DZ-9439-C / Side Gasket
F2DZ-9A425-AA / China Gasket (Front)
F3DZ-9A424-BA / China Gasket (Rear)
4L5Z-9H486-AA / Gasket-Upper Intake Manifold
FORD: 2004-2006 Ranger
ISSUE
Some 2004-2006 Rangers 3.0L-2V "Vulcan"vehicles may exhibit:
- Malfunction indicator lamp (MIL) on with diagnostic trouble codes (DTCs) P0300-P0306 and P0316
- Rough running at various RPM
- Rough idle
- Misfire
ACTION
This may be due to an engine exhaust valve seat recession causing a loss of compression. Refer to the following Service Procedure to diagnose exhaust valve seat recession.
SERVICE PROCEDURE
1. Perform a power balance rest to clarify if a cylinder is misfiring. Identify and keep record of any cylinder that has a concern.
2. Perform a manual compression test with the spark plugs removed to locate any cylinder that may have low compression. Refer to the appropriate Workshop Manual, Engine System, General Information, 303-00.
3. If no low compression is found per shop manual instructions, proceed with normal misfire diagnostics per the Powertrain Controls/Emissions Diagnosis (PC/ED) Manual for the appropriate model year.
4. If low compression is found and it is a cylinder that had a misfire on power balance, perform a leakdown test to determine the source of leakage that may be causing the low compression. Refer to the appropriate Workshop Manual, Engine System, General Information, 303-00.
5. If low compression is found in a cylinder that did not have a misfire detected then proceed with normal base engine diagnostics per the Workshop Manual, Engine System, General Information, 303-00.6.
If the exhaust valve is identified as the source, replace both cylinder heads with the newly released service cylinder heads. Refer to the appropriate Workshop Manual, Section 301-01A.
PART NUMBER / PART NAME
6U7Z-6049-A / Cylinder Head Assembly
2F1Z-6079-BB / Upper Gasket Kit
F8 DZ-6065-AA / Cylinder Head Bolts
F7DZ-9448-BB / Engine Exhaust Gasket
4F1Z-658-AA / Valve Cover Gasket
F6DZ-9439-C / Side Gasket
F2DZ-9A425-AA / China Gasket (Front)
F3DZ-9A424-BA / China Gasket (Rear)
4L5Z-9H486-AA / Gasket-Upper Intake Manifold
And it didn't happen under warranty usually, 150k + miles, but seems you were having symptoms earlier, yes new coil and spark plugs could have helped with just a little compression loss.
Yes, compression test may show lower numbers on #4.
Dry then Wet Leak down test may be needed as well.
Heads can now be rebuilt, but new/refurbished heads can be quicker
Last edited by RonD; Nov 21, 2016 at 08:02 PM.
Thread Starter
|
Member
Joined: Nov 2016
Posts: 2
Likes: 0
From: Houston, TX
I will be doing a compression test later today.
I have been slowly leaking coolant for the better part of a year and a half. Not a fast leak, and without messing around it was hard to tell where exactly it was coming from. I wasn't too concerned since it seemed like it was leaking onto the ground.
The truck still runs and drives well, if it wasn't throwing the misfire codes, I wouldn't even know anything is wrong.
I have been slowly leaking coolant for the better part of a year and a half. Not a fast leak, and without messing around it was hard to tell where exactly it was coming from. I wasn't too concerned since it seemed like it was leaking onto the ground.
The truck still runs and drives well, if it wasn't throwing the misfire codes, I wouldn't even know anything is wrong.
Member
Joined: Jul 2017
Posts: 31
Likes: 0
From: Conroe
Good afternoon everyone,
I have a 2004 Ford Ranger Edge with a 3.0L Engine. I have had the truck for the last 7 or 8 years and gotten it to just about 205,000 miles.
Over the last month or so I have been getting the P304 and P316 check engine codes. For some reason, ever since I bought it, the ignition coil goes out every year. I bought one from Autozone a long time ago with a lifetime warranty and usually when I get a miss fire code, that's the issue. This time however is different.
I swapped out the coil first, hoping that was all it was. Didn't fix it.
Next I swapped out the spark plugs and spark plug wires (last time I did this was about 4 years ago). Didn't fix it either.
It has stayed consistent with the P304 and P316, so next I swapped out the fuel injector. Since that side was hard to get to, and the old injectors were the original ones that it came with, and pretty dirty, I went ahead and replaced all 3 on that side. I could tell the engine ran a little better, but it still didn't fix the problem.
Next I will do a compression test. Is there anything I am missing along the way? This truck has been very good to me over the years, and I kinda want to see it get to 300,000.
I have a 2004 Ford Ranger Edge with a 3.0L Engine. I have had the truck for the last 7 or 8 years and gotten it to just about 205,000 miles.
Over the last month or so I have been getting the P304 and P316 check engine codes. For some reason, ever since I bought it, the ignition coil goes out every year. I bought one from Autozone a long time ago with a lifetime warranty and usually when I get a miss fire code, that's the issue. This time however is different.
I swapped out the coil first, hoping that was all it was. Didn't fix it.
Next I swapped out the spark plugs and spark plug wires (last time I did this was about 4 years ago). Didn't fix it either.
It has stayed consistent with the P304 and P316, so next I swapped out the fuel injector. Since that side was hard to get to, and the old injectors were the original ones that it came with, and pretty dirty, I went ahead and replaced all 3 on that side. I could tell the engine ran a little better, but it still didn't fix the problem.
Next I will do a compression test. Is there anything I am missing along the way? This truck has been very good to me over the years, and I kinda want to see it get to 300,000.
I have still not had the time/money to pull the heads to check them out... but I need to soon.
Thread
Thread Starter
Forum
Replies
Last Post
glreynol
4.0L OHV & SOHC V6 Tech
48
Jun 6, 2021 01:05 PM
