P0304 & P0316 - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 01-26-2015
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P0304 & P0316

Hey everyone. I have a 2006 Ford Ranger XLT 3.0L and it has been idling hard and when I try to drive it after accelerating the check engine light begins flashing and the truck shakes. I did a scan and received codes P0304 and P0316. I just changed the spark plugs and spark plug wires and it seemed to be a lot less shaky, the check engine light went off, but when I revved it up it sounded like it was misfiring again and I put the code reader in and it shot back the P0304 and P0316 codes again.

Anyone know what it could possibly be or what I should do?

The truck only has 87,000 miles on it and has been kept up with oil changes and stuff like that.
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Old 01-26-2015
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check the coil pack. If thats good, then perform a compression check, leak down etc. My worry is your year engine is a prime candidate for fucked up valve seats. Mine had that problem, had to replace the Heads completely.

Also while your at it, replace the IAC valve
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Old 01-26-2015
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This is the Ford TSB about '04-'06 3.0l engines, although it seems to be an issue back to the '01 3.0ls

Just to add there was also a TSB about the 3.0l Coil Packs on these years as well, can't find it, it had serial number range for the coils that were causing the problem of random misfires.

**************************
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
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Old 01-26-2015
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Thanks Ron!
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