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Registered
Join Date: Aug 2000
Location: North Carolina
Posts: 302
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spark plug 'Reading' question
Hey gang,
I'm still working on a hesitation issue and have a question. Upon reading my spark plugs, the inner 2 cyl are running leaner than the outer 2. With or without connecting the O2 sensor. The outer 2 plugs are reading richer. I just pulled and flushed the injectors and replaced seals and hats, but the hesitation is still there. I marked and switched injectors, moving the inner 2 to the outer just to see if the problem goes with the injectors. If not , any ideas what would cause the 2 inner to run leaner? If I connect the O2 sensor then its apparent that the 2 inner cyl are running too lean, which is probably why I have the hesitation.
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1988 951 Alpine White / Burgandy Profec B spec II EBC,HomeBrew Chips, WideFire HG, Tial 38mm, Magnecor Wires, Koni Rears, Adj Rear Droplinks, Zeitronix WideBand. |
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03-08-2003, 04:09 AM
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You may have a mainfold leak where it bolts to the head.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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03-08-2003, 10:05 AM
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Join Date: Apr 2001
Location: NC
Posts: 411
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Second the leak, check the manifold bolt torque, if they are the same the problem persists, put on new gaskets and retorque. Make sure the flanges are very clean. Even a small bit of trash can cause irritating problems.
Dave
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Dave951M 86 951 Blitzwagen 82 931 Basket Case (for now) |
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03-08-2003, 02:25 PM
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suck my tail pipe
Join Date: Oct 2002
Location: Havertown, Pa. U.S.A.
Posts: 1,847
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Ditto the above motion...
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My car is naughty |
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03-08-2003, 02:37 PM
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Registered
Join Date: Aug 2000
Location: North Carolina
Posts: 302
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Thats what I thought also, I retorqued the bolts and pressure tested the intake today with 15psi and sprayed the intake flanges with soapy water. No leaks. The only leak I could find was around the electrical connector on the cycling valve.
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1988 951 Alpine White / Burgandy Profec B spec II EBC,HomeBrew Chips, WideFire HG, Tial 38mm, Magnecor Wires, Koni Rears, Adj Rear Droplinks, Zeitronix WideBand. |
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03-08-2003, 04:05 PM
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1983 Porsche 944 2.5 liter
