Honda Accord (1990 - 2002) Includes 1997 - 1999 Acura CL

One cylinder running lean, advice please?

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Old Jan 20, 2009 | 09:39 AM
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bigsnorlax's Avatar
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From: Richmond, Va, Henrico
Default One cylinder running lean, advice please?

When i was changing my oil the other day i pulled the plugs to make sure they were still fine and then gapped them. But when i pulled my farthest passenger side plug it was very chalky and white looking. All my other plugs showed signs of good burn but just this one was chalky. As far as im my knowledge goes a chalky plug means the cyclinder is runnig lean (more air) so could this mean my injector is bad? or atleast clogged or dirty?
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Old Jan 20, 2009 | 09:46 AM
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masterkill455's Avatar
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Default Re: One cylinder running lean, advice please?

I would think you have a bad injector yes. Try swapping that injector with one from another cylinder and if the problem jumps to the cylinder you put the suspect injector in youve got a bad one
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Old Jan 20, 2009 | 01:11 PM
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Default Re: One cylinder running lean, advice please?

Generally.... white is good, black is bad, brown is low compression, and crusty is burning oil.
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Old Jan 20, 2009 | 01:45 PM
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P_Adams's Avatar
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Default Re: One cylinder running lean, advice please?

Originally Posted by bigsnorlax
When i was changing my oil the other day i pulled the plugs to make sure they were still fine and then gapped them. But when i pulled my farthest passenger side plug it was very chalky and white looking. All my other plugs showed signs of good burn but just this one was chalky. As far as im my knowledge goes a chalky plug means the cyclinder is runnig lean (more air) so could this mean my injector is bad? or atleast clogged or dirty?
Reading spark plugs isn't all that difficult.
It's not entirely what color they are but also how they compare to each other.
Generally speaking, a plug burning unleaded fuel should exibit a dry powdery coating the color of extra extra light Dunkin Donuts Coffee (no sugar please)
This can be caused by several factors:
Injector (as mentioned elsewhere)
Intake Manifold leak
Leaking vacuum hose
EGR port glogged

I listed them in the order of easiest diagnosis

P
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