How do my Spark Plugs look?
#1
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How do my Spark Plugs look?
Pulled the plugs from my miata and not really sure how bad they look. The number one cylinder plug looks a little crusty, the rest look pretty good.
Here are pics of number 1 and number 2 plugs.
Number 1
Number 1
Number 2
Number 2
I am thinking number one for sure looks a bit too lean. What you guys think?
Afrs are 15.5 cruising, sometimes i would get as low as 12.3 when cruising or slowly acceleration in 2 and 3rd. And sometimes i get as high as 17.5 when just about getting very slowly into boost. I still cant figure out why this is happening. Wot is consistent 11.5-10.8.
Here are pics of number 1 and number 2 plugs.
Number 1
Number 1
Number 2
Number 2
I am thinking number one for sure looks a bit too lean. What you guys think?
Afrs are 15.5 cruising, sometimes i would get as low as 12.3 when cruising or slowly acceleration in 2 and 3rd. And sometimes i get as high as 17.5 when just about getting very slowly into boost. I still cant figure out why this is happening. Wot is consistent 11.5-10.8.
#4
If one is lean, then there must be too much air and not enough fuel. Is there any discussion about the OE intake feeding more air to cylinder #1?
It does look lean to me; what if you swap the injector with #2 and see if the condition moves with it? If it does, it has to be the injector. If it does not, perhaps my suggestion on the manifold might be the problem?
It does look lean to me; what if you swap the injector with #2 and see if the condition moves with it? If it does, it has to be the injector. If it does not, perhaps my suggestion on the manifold might be the problem?
#13
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I guess you guys really misunderstood when i meant i run it at 17.5. Lets say i am driving in 3rd gear with vacuum at 10 and start to accelerate very very smoothly with just lightly pressing on the gas. Right when the boost gauge hits about .5PSI my afrs go from 15 to 17.5 and the car starts to lurch a little back and worth, i can keep it like this for a very short time, if i keep accelerating and boost goes to 1psi my afrs go to 12 and if i floor it it does to 11.2 or so. If i am in second and floor the car all the way to 7500 my afrs are instant 10.8-11.5. This is something like a part throttle deal.
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