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Locate PCV valve, excessive crankcase pressure

Tiny
MARKSPEARS
  • MEMBER
  • 2005 FORD FIVE HUNDRED
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 165,987 MILES
Engine started missing out finally quit running. I got it to start after it cooled off. I noticed the oil fill cap seemed loose. I started to loosen it and the cap blew off in my hand. Seems to be a lot of pressure in crankcase. Mechanic suggested PCV valve bad.
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Tuesday, March 12th, 2019 AT 9:09 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

I doubt it is the PCV. To have that much pressure suggests something else in the motor. It could be a bad piston.

Does the engine run bad?

Is the check engine light on?

The procedure is below with some pictures for you to view.

Roy

Removal and Installation
1. Remove the 4 transaxle roll restrictor brace bolts.
- To install, clean the bolts using a wire brush, apply new threadlocker to the threads and tighten to 55 Nm (41 lb-ft).

2. Remove the bolt and the transaxle roll restrictor brace.
- To install, clean the bolts using a wire brush, apply new threadlocker to the threads and tighten to 48 Nm (35 lb-ft).

3. Disconnect the positive crankcase ventilation (PCV) valve tube from the PCV valve.
4. If equipped, disconnect the PCV valve electrical connector.

5. CAUTION: A new PCV valve must be installed if removed from the cam cover. Damage will occur to the locking mechanism on the PCV valve.

Rotate the PCV valve counterclockwise to remove from the valve cover.

6. To install, reverse the removal procedure.

Roy
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Tuesday, March 12th, 2019 AT 4:41 PM
Tiny
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Thanks Roy asemaster6371. I started the car again it has a loud tapping and knocking noise. It gets louder when I try to increase rpm. It will not stay running and will not start again. Check engine light is on. Thanks again.
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Wednesday, March 13th, 2019 AT 6:46 AM
Tiny
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  • MECHANIC
  • 52,797 POSTS
Sounds like you have internal engine damage.

Looks like you will need a motor.

Roy
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Wednesday, March 13th, 2019 AT 12:31 PM
Tiny
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Thanks Roy, I thought it could be a serious problem. I was hoping it could be a valve-train problem. The car is going to the shop Friday, I will let you know what we find. Thanks again.
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Thursday, March 14th, 2019 AT 6:42 AM
Tiny
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  • MECHANIC
  • 52,797 POSTS
Sounds good.

Always glad to help

Roy
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Thursday, March 14th, 2019 AT 2:10 PM

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