Today I feel misfire and wanted to check a spark plug. After 1500 miles I think they should be changed. I was thinking that I'm running pig rich, but could the reason of that be burning oil ??



A brand new Autolite 3923 and my 1500 miles Autolite 3923.



These are my +%&%&!! plugs.

 

id say u got some injector problems some not working some dirty and pos a controll prob were the white injectors or clean i should say fuel soaked

 

Your pic scared me, i thought the brand new one was from your engine and was just steam cleaned from a coolant leak

 

You have oil in the cylinder, do a leakdown test.


David

 

These are the injectors from the beginning of the first start of my new 383 engine. Yes my engine was burning oil, and still burning a little now, but during break-in isn't it normal ??
I hope my rings seated properly. (I'm using 15w 50 dino)

 

Could not be fuel related?

 

From the photo it looks like fuel fouled not oil fouled. Fuel fouled will look black/soft/velvety. Oil will black/hard/crumbly.

 

The one in the first pic looks gas fouled. There is some foreign substance on the middle plug in the second pic; not really sure what that is. The far left plug looks as if it may have been running a little lean. I take it these are the plugs you broke the motor in with? Is that the only gas fouled plug you found? I'd definitely say you had a miss.

 

Yes these are the plugs which I broke the motor in. I changed the plugs with a set of another Autolite 3923, but I still feel a misfire. I can even hear that from my exhausts. While I'm cruising around 2500 RPM the sound is coming partially. The most black plug was that. Why aren't all black? Why the only one is the most black and the others are differents?

I will look at my A/F as soon as my LM-1 shipped to me.

 

I had something similar to this when my car was running like crap. Some plugs would foul and others were perfectly fine. I eventually found it to be a bad coil. If you know of someone that has a similar car, you could swap them out in 5 minutes and see if that helps. Try swapping around injectors and see if the problem follows.

 

Something else you might wanna check the actual injector on that cylinder, I've had one stick on me before and it was fuel foul that plug like no other.
I know this is my first post on the site but I'm not new to motors @ all, I just got done with another KA handbuid for my s13
Hope you can lock it down, goodluck.