• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

Fouled plug after intake install

  • Thread starter Thread starter Fox Saleen 163
  • Start date Start date Jan 3, 2004

Fox Saleen 163

New Member
Dec 5, 2003
286
0
0
San Diego, CA
Jan 3, 2004
#1
  • Jan 3, 2004
  • #1
This is just an update to the problem I had with the #8 cylinder fouling a plug after the Cobra intake install. I thought it was because oil and coolant went into the cylinder during the insall. I was wrong. After putting new plugs in, it fouled #8 again. It looked like oil not fuel, so I was like WTF? Did I mess up with the gasket or something? Well most of us know about the Cobra intake sucking oil out of the PCV valve. Can you believe this thing sucked enough oil to foul a plug? I pulled the PCV Vac line going to the intake off and about 1/4 quart of oil came out. What did I do? I plugged the PCV and the VAC on the intake. I also plugged the Vac line on the TB and the Valve cover. I just stuck an air breather on the Valve Cover where the oil cap goes. No more fouled plugs and the car even idles better. Also, you know how our cars typically won't idle down to 750 when it's still moving? Well after plugging those lines it will go down to 750 with the clutch in regardless of my speed. Weird. Anyway... you guys that have visual inspections remember that this is not smog legal.
 
You must log in or register to reply here.

Similar threads

A
Engine Genius installed oil filler above rocker arm…
  • afjLX
  • Mar 27, 2025
  • Fox 5.0 Mustang Tech
Replies
5
Views
471
Fox 5.0 Mustang Tech Mar 29, 2025
nicholase
2
Running very very rich
  • 2esoteric
  • Oct 31, 2025
  • Fox 5.0 Mustang Tech
Replies
4
Views
305
Fox 5.0 Mustang Tech Oct 31, 2025
Noobz347
F
Spark Plugs Caused Rough Idle & Driving
  • firevert
  • Sep 1, 2025
  • 2005 - 2009 Specific Tech
Replies
3
Views
360
2005 - 2009 Specific Tech Sep 3, 2025
Noobz347
Forced Induction Bypass valve backwards?
  • Dontknowchit
  • Jun 25, 2025
  • Fox 5.0 Mustang Tech
Replies
3
Views
295
Fox 5.0 Mustang Tech Jun 29, 2025
JD1964
New Member with a 1992
  • Clutchfork
  • Oct 18, 2025
  • The Welcome Wagon
Replies
5
Views
259
The Welcome Wagon Oct 19, 2025
Clutchfork
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?