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  '79 to '93 -- The Fox Mustang
  Where's the PCV Valve?

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Author Topic:   Where's the PCV Valve?
ddenton749
Gearhead

Posts: 377
From: Kennett Square, PA, USA
Registered: Apr 2004

posted 09-19-2004 12:32 PM     Click Here to See the Profile for ddenton749   Click Here to Email ddenton749     Edit/Delete Message   Reply w/Quote
Where is the PCV valve on my '91 5.0 HO? I don't see it in the valve covers. I had to R&R the IACV to clean it because it was gummed up with oil. I'm assuming that the PCV valve/hose is clogged and oil is blowing back into the intake.

Please feel free to offer any other suggestions for the oil in the intake.

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club

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Velocity0
Gearhead

Posts: 330
From: Burnaby, BC Canada
Registered: Apr 2001

posted 09-19-2004 11:06 PM     Click Here to See the Profile for Velocity0   Click Here to Email Velocity0     Edit/Delete Message   Reply w/Quote
Behind the intake by the firewall. right in the middle.

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ddenton749
Gearhead

Posts: 377
From: Kennett Square, PA, USA
Registered: Apr 2004

posted 09-19-2004 11:12 PM     Click Here to See the Profile for ddenton749   Click Here to Email ddenton749     Edit/Delete Message   Reply w/Quote
Thanks, Velocity. I'll look again.

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club

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Daniel Jones
Gearhead

Posts: 818
From: St. Louis, MO
Registered: Aug 99

posted 09-20-2004 12:08 PM     Click Here to See the Profile for Daniel Jones   Click Here to Email Daniel Jones     Edit/Delete Message   Reply w/Quote
Don't forget there's a metal mesh screen below it that must be removed and cleaned. There's a little corkscrew tool to remove it. Also it's likely the grommet that holds the PCV is hard and needs relacing.

Dan Jones

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ddenton749
Gearhead

Posts: 377
From: Kennett Square, PA, USA
Registered: Apr 2004

posted 09-20-2004 12:40 PM     Click Here to See the Profile for ddenton749   Click Here to Email ddenton749     Edit/Delete Message   Reply w/Quote
Thanks, Dan. That's a big help. I didn't know that. Do you know where I can get the tool? Is it available at the local parts store?

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club

[This message has been edited by ddenton749 (edited 09-20-2004).]

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Daniel Jones
Gearhead

Posts: 818
From: St. Louis, MO
Registered: Aug 99

posted 09-20-2004 06:13 PM     Click Here to See the Profile for Daniel Jones   Click Here to Email Daniel Jones     Edit/Delete Message   Reply w/Quote
I got the grommet at the dealer but I think my dad already had the tool. Come to think of it, it might have just been a curved dental pick that I used to snag it with.
Dan

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ddenton749
Gearhead

Posts: 377
From: Kennett Square, PA, USA
Registered: Apr 2004

posted 09-20-2004 09:47 PM     Click Here to See the Profile for ddenton749   Click Here to Email ddenton749     Edit/Delete Message   Reply w/Quote
I wound up using a small pair of forceps to grab the screen.

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club

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Ryan Wilke
Gearhead

Posts: 2066
From: Stanton, Michigan 49707
Registered: Oct 2000

posted 09-27-2004 11:01 AM     Click Here to See the Profile for Ryan Wilke   Click Here to Email Ryan Wilke     Edit/Delete Message   Reply w/Quote
Is the screen some sort of 'oil arrestor' or something?

Is it really necessary to replace it?

????????? Ryan

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Daniel Jones
Gearhead

Posts: 818
From: St. Louis, MO
Registered: Aug 99

posted 09-27-2004 12:39 PM     Click Here to See the Profile for Daniel Jones   Click Here to Email Daniel Jones     Edit/Delete Message   Reply w/Quote
> Is it really necessary to replace it?

It keeps the PCV valve itself from getting gunked up.
If the screen is clogged, the PCV valve won't do its job.
Don't forget about replacing the grommet. Do the job right
and you won't have to do it again.

Dan Jones

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