Don't put autolite (autocrap) in your car, they're junk.
Cons: poor quality
Reviews of Autolite spark plug
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I've gotten autolites a few times for some domestic cars and they've been 0.005\" - 0.010\" off seemingly across the board, compared to what the box said they should be. And I wasted a day hunting down a misfire that turned out to be a bad spark plug out of the box.
Cons: incorrect gap, bad plug out of box, misfire
Don't go with Autolite XP iridium. I had on my Jetta and one of the tips basically melted after 25k. They suck.
Cons: tips melted, poor quality
Vehicle:
Volkswagen Jetta
Mileage: 25000 km
autolites 3923 platinumsgave me the same mpg as the expensive NGK platinum.....
Pros: same MPG as NGK
Cons: expensive
Part number: 3923
I took a peak at mine the other week and the gap was HUGE so gapped them down to .035 and now cold starts are ROUGH. The pugs in there suck, anyway - old autlites.
Cons: rough cold starts, poor performance
Autolite 4162's, I changed them out every 1000 miles.
Cons: short lifespan
Vehicle:
Volkswagen
Mileage: 1000 km
Part number: 4162
I installed a set of Autolite 3923's gapped to .032 and guess what? FIXED! unbelievable, after all this testing only to find out that all I needed was new plugs.
Pros: problem fixed, unbelievable result
Vehicle:
Volkswagen
Mileage: 172199 km
Part number: 3923
So, I went ahead with the Autolite XP iridium plugs. Right now, I cannot complain. Everything is running pretty good. I put these in to compare to the standard Autolite copper plugs that I put in my 2001 2.0L AEG in January of 2009. Here is what has happened so far. 1. Since the new plugs, my idle rpm increased about 50-100 rpm to low 800s to mid 800s . Whether this is good or bad, I don't know. This may consume a small bit more of gas though while sitting at a stop light. 2. Since the new plugs, I can also feel a small vibration that seems to come from the engine bay. This only happens on a cold start as I am accelerating from around 15-40 mph. When it's warmed up, it's gone while accelerating. This may come my new catalytic converter and flex pipe that I just got installed, but I don't know. It may also come from new front rotors and pads that I just put in that haven't had time to properly be bedded, I don't know. I am putting some new dog bone mount inserts in within the next few days as well. 3. Since the new plugs, my engine seems to have had a small performance increase in acceleration, response, and in smoothness; except in cold start accelerations as stated above. This may not make a big deal to some, but I am happy with this. 4. Since the new plugs, the best deal I have had is the lower rpms when I am using cruise control around 40-55 mph. I am serious when I tell you that my rpms went down a good 150-250 rpms at these cruising speeds. I do believe that because of these plugs, I will get a small boost in mpg; I will let you all know shortly. Also note that only the plugs and nothing else was changed at this interval. Can I tell you what happens at 65 mph+, no because I don't go on a highway to school or work. So, my overall impression with the iridium plugs is a positive one so far. I have gone just over 500 miles since the new plugs were put in.
Pros: improved acceleration, smoother engine, lower cruising RPMs, potential MPG boost
Cons: increased idle RPM, cold start vibration
Vehicle:
Volkswagen Jetta
Mileage: 805 km
Good old standard Autolite Coppers work just as well as anything on the market, as long as you replace them every few thousand miles. At $.99 a piece, you can't beat 'em.
Pros: good performance, excellent value
Cons: short lifespan
the plugs are autolite platinums AP3924. the wires are the blue ignitors from techtonics. the rest of the ignition is stock. do i regap the plugs, or should i leave them where they are now. i'm leaning towards leave them since it ran fine before and i don't want to deal with a no start issue when i start it or the first time with the new cam.
Pros: ran fine before
Cons: no start issue
Part number: AP3924
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