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jamez · Guest

I just replaced the spark plugs in my car, and the old ones were very white indicating a lean runnning condition, how do I adjust the mixture?

question 2, what is the proper way to drill through plexiglass, are there special bits that wont make it chip and crack. thanks

dgz924s · Guest

Jamez...Try a real sharp bit and hi RPM's and tape the hole being drilled. D

Peter_in_AU · Joined: 29 Jul 2001 Posts: 2743 Location: Sydney, Australia

practice on offcuts first.

jamez · Guest

Ok, thanks for the reply guys, Ive got a few scrap peices to try it on..
so what about my spark plugs being white? should I richen the mixture just a little, or would it be best just to bring it to the shop where they have the right equipment to make sure the mixture is just right?

Joes924 · Guest

wdb · Guest

when the car is just idling it is normaly running a little lean . ( EGR valve is open ) and under very light throttle also runs a little lean for fuel economy .so if the car was idling or lightly driven for awhile just prior to you examinining the plugs thats what you'll see . dont change the air fuel setting unless your sure it needs adjusting . put your hand near the tail pipe and feel the exhaust flow , it should be smooth and steady and maybe a slight hint of popping . if your running very lean the exhaust will be popping alot .it would be cheaper to buy an inexpensive air fuel meter (15-25 dollars ) and install it to see how your engine is running than to take it to a shop , shops normally charge a flat rate just to look at you car 25-60 dollars . if the plug insulation isnt blistered or doesnt have brown or black deposits baked on and the electrodes arent melted, and the car isnt over heating, I would go with the air fuel meter first .