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#1 cylinder spark plug is oil soaked and causing misfire. What could cause this?

Tiny
MPSADOWSKI
  • MEMBER
  • 1999 PONTIAC SUNFIRE
  • 107,000 MILES
1. Checked compression, #1 cyl. 200-205 psi, the other 3 were all 210 psi. -Ok
2. Do not see coolant in oil.
3. Check coolant reservoir open and cranked. Did not see and bubbles come out.
4. Listened for all fuel injector clicking-ok.
5. Removed injectors and ensured they functioned properly by pressurizing each and running carb cleaner through them.-All ok.
6. All injectors read 12.6 ohms.
7. Could it be the valve stem seals? Is there a way to check without removing cam blocks?



removed and checked all
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Friday, October 21st, 2011 AT 7:41 PM

3 Replies

Tiny
MPSADOWSKI
  • MEMBER
  • 4 POSTS
I forgot to mention that I did pull the tower off and checked for spark at each plug to ensure all plugs were firing.
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Friday, October 21st, 2011 AT 7:48 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be a valve guides/stems/seals-the engine will emit blue smoke when 1st started then vanish is this happening?
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Wednesday, October 26th, 2011 AT 11:22 AM
Tiny
MPSADOWSKI
  • MEMBER
  • 4 POSTS
I don't know. Right now I have things disassembled with the fuel rail and injectors removed.
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Wednesday, October 26th, 2011 AT 4:42 PM

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