 Spark Plug Diagnostics for a Subaru six conversion |
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| nsyr |
 Mar 27 2016, 03:54 PM
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Because I Can  Group: Members Posts: 314 Joined: 16-May 04 From: Tampa, FL Member No.: 2,073  |
I pulled the plugs on my eg33 conversion and cannot for the life of me decipher what is wrong. As you can see the 3 plugs on the left look fine. These were from one side of the engine. The 2 from the other side look to be carbon fouled with whitish tips? I was thinking weak ignition coils so I switched them around but nothing changed. I then swapped the o2 sensors with no change. Could oil cause dry carbon build up? The oil on the threads of the bad two plugs is from external leakage.
I did put new plugs in and only after 5 miles the plugs from the same two cylinders already had carbon build up while the other plugs are clean. The engine does have hesitation and surging but still feels pretty strong. I am thinking valve guide seals but would like another opinion. Attached thumbnail(s) 
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Posts in this topic
nsyr Spark Plug Diagnostics for a Subaru six conversion Mar 27 2016, 03:54 PM
nsyr Another pic Mar 27 2016, 03:55 PM r_towle Not,sure how to diagnose this but if the system mo... Mar 27 2016, 03:58 PM nsyr I have checked and repaired all vacuum leaks. I ha... Mar 27 2016, 04:00 PM nsyr The idle is a bit rough and when I accelerate the ... Mar 27 2016, 04:02 PM r_towle Running too rich.
Do you have a way to monitor the... Mar 27 2016, 04:04 PM nsyr The thing that gets me though is of the three plug... Mar 27 2016, 04:08 PM
porschetub
The thing that gets me though is of the three plu... Mar 29 2016, 02:22 AM r_towle You may need to tap into the ECU to see if it lock... Mar 27 2016, 04:12 PM tomrev You may want to pull the injectors from the offend... Mar 27 2016, 04:29 PM Chris H.
You may need to tap into the ECU to see if it loc... Mar 28 2016, 06:43 AM matthepcat Check the compression on all cylinders, report bac... Mar 27 2016, 11:58 PM nsyr I have not tested compression yet. I am in the pro... Mar 29 2016, 06:35 AM Chris H. So one of the sensors was bad or you had already d... Mar 29 2016, 10:56 AM lcjo73914 I agree with MATHEPCAT. Test the compression.
Is i... Mar 29 2016, 11:44 AM nsyr I did have a bad sensor but it was replaced a coup... Mar 29 2016, 12:22 PM mgp4591 I would lean towards dirty injectors. I haven... Mar 29 2016, 12:53 PM Chris H. I would think electrical or injectors before valve... Mar 29 2016, 09:53 PM  |
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