It was time to change the plugs so I went for one range colder (from Autolite 3923 to 3922). Before I installed these plugs, the power would drop off dramatically above 5500 in 3rd, 4th, and 5th. Now it is a much more progressive decline. The car actually maintains that pushed back in the seat feeling in the upper revs now.
The cheapo Autolite 3923 works very, very well. Works well with chipped and K04 cars also.
i run autolite 63 (gap to 24 thousandths) on my stage 4 for 500 miles with nitrous, they look perfect. 99 cents each. to each his own.
i put in some 3922s and i can hear it misfire when its idling, but it seems fine when im giving it gas.
When we got our 535xi one of the first things I did was visit the local parts place to buy new spark plugs for the N54. After driving the car a while and visiting many BMW discussion boards I learned most folks have a very low opinion of them
Autolite made the only plug I've ever had that was dead when brand new.
I did the plug change for the first time on my Tig. Pretty easy and took maybe 30 minutes. tricky part was getting the wire harness/clips to release from coil packs. Just be patient and use a small screwdriver. FWiW, I used Autolite Iridium plugs cuz my local NAPA dealer was out of the NGK's and recommended these. The quality was really bad on my set.. The cathode (curved portion of the plug) was significantly off axis, misaligned. One plug was bad enough that I returned it for an exchange. These plugs get high reviews on Amazon, so I kept them in without any problem but will be going back to the OEM NGK's next time. My old plugs looked very good for 45K miles.
I didn't know any better and used ****ty autolite spark plugs, and everything was fine and the misfires went away... A few days ago I noticed on quick acceleration and around 4-5k RPM's, the engine loses power, accelerates slower than...well, slower than a 2.0 normally is.
The autolite is a cheap plug, not what is recommended to be used.
Don't put autolite (autocrap) in your car, they're junk.
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