2004 3.0L Ranger Has Bad Misfire
#1
10-21-2017, 12:05 PM
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2004 3.0L Ranger Has Bad Misfire
I have a 2004 Ranger with the 3.0L V6.
Has 170,000 miles on it.
Ice kept up with oil changes, it has new spark plugs, and fuel filter.
Other than fluids, everything is original.
a few months ago, it started having a little misfire shortly after startup, which would go away once you started driving.
Now, it happens often.
Shortly after start up, while driving, idling, and downhill on the highway.
It used to perform well while climbing long inclines in 4th or 5th gear.
Now its 3rd or 4th.
Also, under same long incline, the A/C now cuts off.
Scan tool shows
P0300 - Random/Multiple Cylinder Misfire
P0304 - Cylinder 4 Misfire
P0305 - Cylinder 5 Misfire
P0316 - Engine Misfire Detected on Startup
I cleared it once, these are the same codes that returned. but p0306 was there once.
So, what should I do?
Has 170,000 miles on it.
Ice kept up with oil changes, it has new spark plugs, and fuel filter.
Other than fluids, everything is original.
a few months ago, it started having a little misfire shortly after startup, which would go away once you started driving.
Now, it happens often.
Shortly after start up, while driving, idling, and downhill on the highway.
It used to perform well while climbing long inclines in 4th or 5th gear.
Now its 3rd or 4th.
Also, under same long incline, the A/C now cuts off.
Scan tool shows
P0300 - Random/Multiple Cylinder Misfire
P0304 - Cylinder 4 Misfire
P0305 - Cylinder 5 Misfire
P0316 - Engine Misfire Detected on Startup
I cleared it once, these are the same codes that returned. but p0306 was there once.
So, what should I do?
#3
10-21-2017, 05:40 PM
Fighting a similar problem with our '04 Ranger, the misfire isn't bad enough to prevent someone from driving it but it's enough to be noticable at idle and turn on that annoying light on the dash. So far I have replaced all plugs and plug wires, the coil pack, one upstream O2 sensor, the cam position sensor and synchronizer, ran some injector cleaner through it and cleaned the MAF sensor. None of this has made any difference and the check engine light comes back on in 1 to 3 days, and the kicker is nothing looks really out to lunch with the scanner hooked up. Next thing to check is vacuum or intake leaks but there isn't a lot of that to look at on this motor. Here's wishing you luck with your truck.
#4
10-22-2017, 10:18 AM
Scan tool shows
P0300 - Random/Multiple Cylinder Misfire
P0304 - Cylinder 4 Misfire
P0305 - Cylinder 5 Misfire
P0316 - Engine Misfire Detected on Startup
P0300 - Random/Multiple Cylinder Misfire
P0304 - Cylinder 4 Misfire
P0305 - Cylinder 5 Misfire
P0316 - Engine Misfire Detected on Startup
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
#5
10-23-2017, 01:45 PM
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Okay, so compression and leak-down test.
Ill do that in the next few days and report back.
...but with a cylinder head problem, would this issue be constant?
I mean, when I start it up in the morning, it idles fine until I start driving it.
Then like poo for a while, then back to normal once you've been giving it a go for awhile. Engine is still week compared to 50,000 miles ago however.
Ill do that in the next few days and report back.
...but with a cylinder head problem, would this issue be constant?
I mean, when I start it up in the morning, it idles fine until I start driving it.
Then like poo for a while, then back to normal once you've been giving it a go for awhile. Engine is still week compared to 50,000 miles ago however.
#6
10-23-2017, 06:59 PM
...but with a cylinder head problem, would this issue be constant?
The only other thing I can think of that would cause all those misfire-related codes would be a possible problem with the camshaft position (CMP) sensor signal. The 3.0L CMP sensors are somewhat prone to failure, as are the synchronizer shafts that the sensors are mounted to. See: Ford Ranger 3.0L Camshaft Position Sensor
#7
01-02-2018, 02:06 PM
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It sounds like the beginning of a Catalytic convertor failing. I found mine failing by waiting too long and seeing my exhaust headers glowing red at night after a drive where i could tell the power was limited no matter how much gas i used. Not sure if you can run that test. There are ways a muffler shop can flow test the cat without cutting it out for inspection. My 4.0L had two cats in series. The first cat looked shoved backward at the entry. Bad. The second looked ok. Since i didn't flow test it I don't know what percent clog it might have if any.
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