Diagnose Spark Plugs Photo
#1
Registered
Thread Starter
Diagnose Spark Plugs Photo
Hi,
well as I have posted in other topic my power issued at high speeds was solved after changing plugs at 28583 miles.
I think that my plugs seem overheated what do you think?
I know that overheated plugs can be caused by lean mixture but if this is the case what caused my lean mixture? My car is stock and there is no issue with fuel pump . Recently checked my compression and cat and they seem fine.
Do you think that lower octane fuel (cheap fuel or bad fuel) could have caused a lean mixture?
Do you think that late change of spark plugs at 28583 miles caused the trouble?
Thanks
![](http://www.imageshack.gr/files/oipugf8ovx8dh8uuc4nc_thumb.jpg)
Here you can see in detail the plugs
http://www.imageshack.gr/view.php?fi...8dh8uuc4nc.jpg
well as I have posted in other topic my power issued at high speeds was solved after changing plugs at 28583 miles.
I think that my plugs seem overheated what do you think?
I know that overheated plugs can be caused by lean mixture but if this is the case what caused my lean mixture? My car is stock and there is no issue with fuel pump . Recently checked my compression and cat and they seem fine.
Do you think that lower octane fuel (cheap fuel or bad fuel) could have caused a lean mixture?
Do you think that late change of spark plugs at 28583 miles caused the trouble?
Thanks
![](http://www.imageshack.gr/files/oipugf8ovx8dh8uuc4nc_thumb.jpg)
Here you can see in detail the plugs
http://www.imageshack.gr/view.php?fi...8dh8uuc4nc.jpg
#5
U-Stink-But-I-♥-U
iTrader: (1)
Join Date: Mar 2005
Location: 12 o'clock on the Beltway.
Posts: 2,004
Likes: 0
Received 1 Like
on
1 Post
They dont look anything but normal. That tan color is just what you want. Dont just trust me. There are plenty of resources online that will give you a range of plug conditions via pics or you could show a mech.
Basically, for too hot, (or det) you would see obvious, ashy, whitish areas on the ceramic posts with a melty look or even bubbly. Or you might see pitted (or missing) terminals and posts.
Basically, for too hot, (or det) you would see obvious, ashy, whitish areas on the ceramic posts with a melty look or even bubbly. Or you might see pitted (or missing) terminals and posts.
#6
Registered User
Join Date: Apr 2006
Location: Tacoma, Washington
Posts: 118
Likes: 0
Received 0 Likes
on
0 Posts
Since the rotary burns oil, this is pretty much what you would expect plugs to look like that have seen some burnt oil. I agree with carbonRX8. Your plugs look pretty much the same as mine did when I changed them at around 30k miles.
#7
Registered
Thread Starter
Thanks guys,
My dealer told me that I may run too lean that is the reason of this appearance on the spark plugs. However I do not fully trust my dealer because he does not seem to know much for wankel engines and I have caught him telling me nonsense about some issues.
This is the main reason I wanted another opinion on the plugs appearance issue.
My dealer told me that I may run too lean that is the reason of this appearance on the spark plugs. However I do not fully trust my dealer because he does not seem to know much for wankel engines and I have caught him telling me nonsense about some issues.
This is the main reason I wanted another opinion on the plugs appearance issue.
#8
The Professor
It looks like you have moisture leakage. Possibly from them not tightening the spark plugs enough.
or, Have you noticed that you have needed to add coolant every thousand miles or so?
or, Have you noticed that you have needed to add coolant every thousand miles or so?
#9
Registered
Thread Starter
#10
Registered
Join Date: Feb 2007
Location: Under The Bridge
Posts: 1,420
Likes: 0
Received 0 Likes
on
0 Posts
#11
Registered
Thread Starter
I have not noticed that I need to add coolant every thousand miles. I have added coolant 3-4 times in my car's life which is 28583 miles.
Well these plugs came with my car when it was new from the Mazda dealer.
#13
Registered
Thread Starter
Anyway can you please post this question to another topic because it also interests me but I am more interested about my old spark plugs look.
Thanks
#14
Registered
Thread Starter
Is it possible that this kind of moisture is coming from bad fuel ? (fuel mixed with water)
#15
Registered
Thread Starter
Well there are some people that believe that the green marks on the sparks plugs indicate coolant in the combustion chamber.
Is anybody else that have seen green marks on spark plugs?
Any other photos ???
In case that INDEED there is COOLANT in the combustion chamber what would be the symptoms ????
#16
Registered
Join Date: Jul 2004
Location: Northern California
Posts: 2,196
Likes: 0
Received 0 Likes
on
0 Posts
#17
Registered
Thread Starter
I guess that there is nobody with spark plugs and green marks on them ! Maybe I may have coolant is the combustion chamber although my car seems to have no issue till now.
#19
Registered
Thread Starter
#20
Metatron
iTrader: (1)
How many times you need to hear they are fine?
They have more deposits than OldRotor's - maybe buy just name brand gas, but otherwise normal. The brown deposit is a good indication that your mixture is right.
I would bet the green tint is an oxidation that appeared AFTER you took them out. Burnt coolant leaves no green, and if you burnt enough to leave visible deposits in BOTH rotors, you would have no coolant left.
Stop worrying, just change the next set a little sooner.
S
They have more deposits than OldRotor's - maybe buy just name brand gas, but otherwise normal. The brown deposit is a good indication that your mixture is right.
I would bet the green tint is an oxidation that appeared AFTER you took them out. Burnt coolant leaves no green, and if you burnt enough to leave visible deposits in BOTH rotors, you would have no coolant left.
Stop worrying, just change the next set a little sooner.
S
#21
Registered
Thread Starter
^ thanks for your response StealthTL.
Just for the history the first plugs were pull out at 28583 miles and the second set at 6250 miles. Both sets had green tint the very moment I pulled them out of the renesis.
So I worry that there might be leaking of coolant at the combustion chamber and that is the reason I scheduled a meeting with Dealer in order to pressurize the coolant system so a decrease of pressure might indicate the leakage.
In addition, I have never seen any other spark plugs that have green tint on them. Probably another person with this kind of appearance on his plugs will help by posting his experience here.
Anyway thank you all guys for your feedback on my problem.
Just for the history the first plugs were pull out at 28583 miles and the second set at 6250 miles. Both sets had green tint the very moment I pulled them out of the renesis.
So I worry that there might be leaking of coolant at the combustion chamber and that is the reason I scheduled a meeting with Dealer in order to pressurize the coolant system so a decrease of pressure might indicate the leakage.
In addition, I have never seen any other spark plugs that have green tint on them. Probably another person with this kind of appearance on his plugs will help by posting his experience here.
Anyway thank you all guys for your feedback on my problem.
Thread
Thread Starter
Forum
Replies
Last Post
TeslaMSI
New Member Forum
11
12-10-2015 01:10 AM
SBGarage
Vendor Classifieds
0
09-06-2015 03:30 PM
SBGarage
Sakebomb Garage
0
09-06-2015 03:29 PM
Touge
Canada Forum
0
09-01-2015 10:47 PM