NA burning oil and fouling plug… hmmm
#1
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
ok, so i changed my oil about 4 weeks ago. i started to hear some tapping from the top end and assumed it was a lifter…. nope, 2 quarts low!!!! WTF! no leaks, no noticeable smoking… the hell?
i changed the plugs, this is what i found…
![](https://www.miataturbo.net/attachments/engine-performance-56/49606-na-burning-oil-fouling-plug%85-hmmm-ebe1096f.jpg?dateline=1342759549)
the nasty one came from cylinder 3. the white specs could be caused by knock, the rest of the plugs looked great. i replaced the plugs with Densos.
a week later i pulled the plugs to check them out, look at cylinder 3 again…
![](https://www.miataturbo.net/attachments/engine-performance-56/49607-na-burning-oil-fouling-plug%85-hmmm-06ad5c46.jpg?dateline=1342759549)
i did a compression check, 180psi across all 4.
the sutty plugs could be a faulty injector, (none of the plugs were oily)
i pulled all four injectors and cleaned them. i put injector 3 in #1 spot to see if the problem follows the injector.
while i have my injectors off, i figured id check the manifold for oil… this is what i found:
![](https://www.miataturbo.net/attachments/engine-performance-56/49608-na-burning-oil-fouling-plug%85-hmmm-6eae099d.jpg?dateline=1342759549)
![](https://www.miataturbo.net/attachments/engine-performance-56/49609-na-burning-oil-fouling-plug%85-hmmm-f9598059.jpg?dateline=1342759549)
![](https://www.miataturbo.net/attachments/engine-performance-56/49610-na-burning-oil-fouling-plug%85-hmmm-9dfc567d.jpg?dateline=1342759549)
and touching the TB blade i get this…
![](https://www.miataturbo.net/attachments/engine-performance-56/49611-na-burning-oil-fouling-plug%85-hmmm-6dac0fc2.jpg?dateline=1342759549)
my car is 100% stock minus a cone filter that i installed tonight. i had just replaced the PCV valve with the Densos. all emissions are intact (i assume thats where the sutty black came from the manifold)
i really need to figure out if the plug and the oil are one in the same. i can't have an oil leak/burn killing my octane rating and causing knock when i go FI.
i changed the plugs, this is what i found…
![](https://www.miataturbo.net/attachments/engine-performance-56/49606-na-burning-oil-fouling-plug%85-hmmm-ebe1096f.jpg?dateline=1342759549)
the nasty one came from cylinder 3. the white specs could be caused by knock, the rest of the plugs looked great. i replaced the plugs with Densos.
a week later i pulled the plugs to check them out, look at cylinder 3 again…
![](https://www.miataturbo.net/attachments/engine-performance-56/49607-na-burning-oil-fouling-plug%85-hmmm-06ad5c46.jpg?dateline=1342759549)
i did a compression check, 180psi across all 4.
the sutty plugs could be a faulty injector, (none of the plugs were oily)
i pulled all four injectors and cleaned them. i put injector 3 in #1 spot to see if the problem follows the injector.
while i have my injectors off, i figured id check the manifold for oil… this is what i found:
![](https://www.miataturbo.net/attachments/engine-performance-56/49608-na-burning-oil-fouling-plug%85-hmmm-6eae099d.jpg?dateline=1342759549)
![](https://www.miataturbo.net/attachments/engine-performance-56/49609-na-burning-oil-fouling-plug%85-hmmm-f9598059.jpg?dateline=1342759549)
![](https://www.miataturbo.net/attachments/engine-performance-56/49610-na-burning-oil-fouling-plug%85-hmmm-9dfc567d.jpg?dateline=1342759549)
and touching the TB blade i get this…
![](https://www.miataturbo.net/attachments/engine-performance-56/49611-na-burning-oil-fouling-plug%85-hmmm-6dac0fc2.jpg?dateline=1342759549)
my car is 100% stock minus a cone filter that i installed tonight. i had just replaced the PCV valve with the Densos. all emissions are intact (i assume thats where the sutty black came from the manifold)
i really need to figure out if the plug and the oil are one in the same. i can't have an oil leak/burn killing my octane rating and causing knock when i go FI.
#12
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Denso is just fine. i only paid 5$ for the set of platinums, why waste money on good plugs if they're probably going to foul out?
cylinder still gets a little black compared to the others. its not bad. ive cleaned the injectors, installed a new fuel filter, and pug in plug wires after i noticed a little surge when cruising around 3-4k. ill put another couple of tanks through it on new plugs and see what i get.
cylinder still gets a little black compared to the others. its not bad. ive cleaned the injectors, installed a new fuel filter, and pug in plug wires after i noticed a little surge when cruising around 3-4k. ill put another couple of tanks through it on new plugs and see what i get.
Thread
Thread Starter
Forum
Replies
Last Post
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM
stoves
Suspension, Brakes, Drivetrain
5
04-21-2016 03:00 PM