Read my spark plugs - running rich, heavy fouling - RX8Club.com



Series II Technical and Trouble shooting Discuss technical details for the Series II RX-8 and any issues or problems you are facing

Reply
 
 
 
Thread Tools Search this Thread Rate Thread
Old 05-17-2018, 12:12 PM   #1  
Registered
Thread Starter
iTrader: (1)
 
Join Date: Sep 2017
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Read my spark plugs - running rich, heavy fouling

I had the same (though less pronounced) ticking noise as shown in this video.

Members of this forum suggested I change the spark plug wires, which I had my dealer perform with Racing Beat wires. (This did not solve the ticking.)

The dealer wrote in the notes (this dealer doesn't bother to explain much) that my "rotor 1 leading plug is missing tip" so I ordered a new one to replace it. When I pulled the original plug, I noticed a ton of fouling and carbon build up after just 5,000 miles.

The engine feels strong and doesn't have any issues starting. I had experience some wobble/dying at idle a few months back when my battery was constantly being discharged due to a faulty alternator, but haven't experienced it since. My gas mileage has always been **** poor (I rarely get over 15 mpg), but I attributed that to aggressive driving and just the design of the rotary engine.

Compression test from 59k miles (now at 65k) also included. Any ideas?
Attached Thumbnails
Read my spark plugs - running rich, heavy fouling-20180517_005741128_ios.jpg   Read my spark plugs - running rich, heavy fouling-20180517_005803616_ios.jpg   Read my spark plugs - running rich, heavy fouling-2018-05-17-10_08_34-info%40palmspringsmotors.com_20151208_162843.pdf-adobe-acrobat-pro-dc.jpg  
Blue2010R3 is offline   Reply With Quote
Old 05-17-2018, 12:54 PM   #2  
转子之魂
 
UnknownJinX's Avatar
 
Join Date: Apr 2017
Location: Victoria, BC
Posts: 912
Thanked 111 Times in 105 Posts
My looked kinda gross after 10k miles, but not as bad as yours.

Which coils were you using?

Also, when you say you are running rich, have you looked at your LTFT and STFT?
UnknownJinX is online now   Reply With Quote
Old 05-17-2018, 01:00 PM   #3  
Registered
Thread Starter
iTrader: (1)
 
Join Date: Sep 2017
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
OEM ignition coils, replaced 4/16 (under 6k miles ago).
I have not performed any tests to verify I am running rich-- just my own conclusion from the plugs.
Blue2010R3 is offline   Reply With Quote
Old 05-17-2018, 01:15 PM   #4  
Put it in "H"!
iTrader: (1)
 
Loki's Avatar
 
Join Date: Jun 2009
Location: Montreal
Posts: 3,543
Thanked 164 Times in 145 Posts
Do you have an OBD reader and can you check your fuel trims (STFT, LTFT) on a warm idle.
90% of rich conditions are just vacuum leaks.
Loki is offline   Reply With Quote
Old 05-17-2018, 04:48 PM   #5  
Registered
 
Join Date: Sep 2005
Location: Tampa
Posts: 438
Thanks: 0
Thanked 19 Times in 18 Posts
does the tick increase with RPM? I dont think it has much to do with spark, because even at say 1,000 rpm idle each plug would be firing at 48x per second which is way faster than that tick. Is it louder on the exhaust side or plug side?

Last edited by strokercharged95gt; 05-17-2018 at 04:52 PM.
strokercharged95gt is offline   Reply With Quote
Old 05-17-2018, 04:51 PM   #6  
Registered
Thread Starter
iTrader: (1)
 
Join Date: Sep 2017
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
In terms of volume, no-- the engine noise drowns it out above ~ 1500 RPM.
In terms of frequency I can't tell due to the above.

Thanks,
Blue2010R3 is offline   Reply With Quote
Old 05-17-2018, 05:01 PM   #7  
Registered
 
Join Date: Sep 2005
Location: Tampa
Posts: 438
Thanks: 0
Thanked 19 Times in 18 Posts
It sounds like an exhaust leak of sorts. I would jack the front end way up (along with the back) and probe droid around all sides of the motor and try to pinpoint where you can hear the loudest ticking noise from. Harbor freight sells a mechanics stethoscope for $4.
strokercharged95gt is offline   Reply With Quote
Old 05-23-2018, 11:23 PM   #8  
Registered
Thread Starter
iTrader: (1)
 
Join Date: Sep 2017
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Here are some STFT and LTFT reads from my Torque app at 0 and 2500 RPM. Not sure if this is helpful at all.

Images are rotated but here is the readout:

Idle (804 RPM):
STFT: +3.1%
LTFT: +1.6%

@ ~2500 RPM:
STFT: 0.0%
LTFT: +1.6%
Attached Thumbnails
Read my spark plugs - running rich, heavy fouling-20180518_015822808_ios.jpg   Read my spark plugs - running rich, heavy fouling-20180518_015828898_ios.jpg   Read my spark plugs - running rich, heavy fouling-20180518_015643538_ios.jpg   Read my spark plugs - running rich, heavy fouling-20180518_015649595_ios.jpg  

Last edited by Blue2010R3; 05-23-2018 at 11:26 PM.
Blue2010R3 is offline   Reply With Quote
Old 05-23-2018, 11:28 PM   #9  
Registered
Thread Starter
iTrader: (1)
 
Join Date: Sep 2017
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
And here is a link to a video I took today showing the pronounced clicking.
https://1drv.ms/v/s!Avww3gBnZPRbylCYK5vXc25-lPkZ

Notice that Rotor 1 Lead Spark Plug wire "jumping".... perplexing as all hell.
Blue2010R3 is offline   Reply With Quote
Old 05-24-2018, 07:30 AM   #10  
Put it in "H"!
iTrader: (1)
 
Loki's Avatar
 
Join Date: Jun 2009
Location: Montreal
Posts: 3,543
Thanked 164 Times in 145 Posts
Fuel trims look good
Spark plug wires are a bit of a weird thing to recommend on thrir own, but that missing electrode is probably not good for the coil attached to that spark plug. Do you have a coil you xan replace it with to test?

Also that electrode is somewhere, potentially in the engine. I'm not sure what can be done to get it out, but it could have caused internal damage.

The frequency sounds in line with spark ignition at idle. Spark plugs fire 13x a second on a 800rpm idle, which matches the sound imo.

Last edited by Loki; 05-24-2018 at 07:36 AM.
Loki is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Rear rotor lead plug fouling lude1888 Series I Trouble Shooting 2 09-30-2016 09:07 PM
Data log, how rich is too rich? noredline Series II Technical and Trouble shooting 16 08-10-2014 08:48 PM
Flat line downstream O2 running rich without rich code wankel1.3 New Member Forum 8 04-05-2014 11:18 AM
Read my plugs! (spark plugs after 58k miles on BHR ignition) Socket7 Series I Tech Garage 30 05-03-2012 11:13 AM
Spark plug fouling remedy rex Series I Tech Garage 9 01-12-2004 07:09 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 04:04 AM.


All content Copyright 2017 by Internet Brands, Inc.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.