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Old 04-13-2007, 06:48 PM
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running lean or rich

Is there any to tell if your engine is running lean or rich and what are the symtoms.

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Old 04-13-2007, 07:16 PM
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quickest way to tell what your engine is doing is to pull the spark plugs
if theyre a light brown color, the engine is running fine, if theyre dark black theyre running a little rich, and if theyre discolored bluish, then youre lean.

-chris
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Old 04-13-2007, 07:58 PM
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Thanks Chris,will check that tomorrow.Do i have to check all plugs?
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Old 04-13-2007, 08:00 PM
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you dont have to check them all......BUT the more of them you check the better of an idea you get of how the engine is running.
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Old 04-13-2007, 08:09 PM
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As lookatme said the more you pull the more you find out. Another thought, if you have a dual plane manifold get some readings from both sides of the motor.
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Old 04-14-2007, 03:08 AM
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Quickest might be pulling plugs...

but most accurate would be using a wide band o2 sensor to tune the engine. They have come way down in price over the last few years now that they are on more and more production cars. Mine is a 2A0-DIY from www.wbo2.com
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Old 04-14-2007, 04:08 PM
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Thanks all for your help,pull the plugs they are all a light brown color.
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