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Help me read my TR6 spark plugs

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Old Aug 9, 2011 | 12:26 PM
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Default Help me read my TR6 spark plugs
Hey guys, the car started running like crap the last week. It originally had some hesitation during warm starts and then the last time it was having low end power issues and sounded like an exhaust leak (more like a dump truck then normal) I am running an open down pipe so it usually sounds like one but had more of a put put noise. I checked everything over, made sure things were tight and limped the car home. Upon getting there I had a misfire code in cylinder 7 pop up. Today I finally got to pull my plugs, here is what I found. I had just set my hptuners to scan misfire and there was no current misfire happening. It did have history missing in cylinder 7.


Cliffs
Car ran fine all summer until the last 4 times taking it out.
Info: 600 miles on plugs, 7# of boost, all gaps still the same (0.028")
Symptoms: Hard warm start, low end hesitation, misfire when warm
Codes: Cylinder 7 misfire, Engine misfire
Solutions: ???


Should I just clean the plugs and see if the misfire comes back in the one cylinder?

[IMG][/IMG]











Plug 7

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Old Aug 9, 2011 | 03:04 PM
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#7 is either fat or burning some oil. #7 is a common failure cylinder. Top ring problems. Two things to do. Replace that plug. You can swap injectors and coil packs/spark plug wires also.
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Old Aug 9, 2011 | 03:48 PM
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replace ur wires first. it could be causing a plug not to fire and it will never show up as anything else as far as an SES light or something. Ive had this same problem.

Unfortuntley are cars run very well on 7 cylinders
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Old Aug 9, 2011 | 03:48 PM
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+ if ur boosted i would recommend using a br7ef
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Old Aug 9, 2011 | 06:43 PM
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Thanks for the responses guys, I cleaned the plugs up and have them back in the car. I am going to take it for a ride and datalog looking at each cylinder and monitor misfire. I swapped plugs around so if the problem moves I know its a plug. I have been hearing from people that spark plug maintenance is quite common on boosted ls1's. Any reccomendations with cyl 7? I am tuning via hptuners.
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Old Aug 9, 2011 | 07:02 PM
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Attached is my scan after cleaning the plugs. Looks like its doing better as far as I can tell.
Attached Files
File Type: hpl
firstscansparkplug.hpl (71.0 KB, 177 views)
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Old Aug 9, 2011 | 07:17 PM
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Are you seriously cleaning plugs that look like that?

Dude plugs are cheap

I am with badge....

Is this engine forged?

What is the blow by like?

Do a compression and leakdown test
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Old Aug 9, 2011 | 07:40 PM
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Originally Posted by 01Z28Camaro
What are you gapping the plugs two? Almost looks like something came in contact with plug 7. I'd stick a borescope in there and look for any piston damage. Mine run 2 months with broken ring lands and still ran 10.4s. Just had plugs 5 and 7 covered in oil and needed cleaned often. Figured It was already done, may as well drive it.
Plugs are gapped at 0.028" I don't have access to a scope currently so I have not been able to look into the cylinder.

Originally Posted by rotary1307cc
Are you seriously cleaning plugs that look like that?

Dude plugs are cheap

I am with badge....

Is this engine forged?

What is the blow by like?

Do a compression and leakdown test
I just cleaned and moved the plugs to see if the misfire moved. They are going to be replaced. Engine is not forged but is only seeing 6-7psi. The car is not raced so I would imagine the low boost will be fine. I am just trying to eliminate possible easy fixes before really tearing things apart. After cleaning them and running for a few minutes the problem appeared to clean up. The plan is new msd wires and plugs then re-scan.
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Old Aug 9, 2011 | 11:41 PM
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kinda off topic, whats ur mods to the car and what hp/tq did you put down?
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Old Aug 10, 2011 | 06:37 AM
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Ive had misfire problems on my single turbo 370 (E85) twice in 3000 miles caused by the TR6 plugs gapped at .028. Not sure why. Swtiched to an Autolite 103.
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Old Aug 10, 2011 | 06:38 AM
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Originally Posted by boost21
Plugs are gapped at 0.028" I don't have access to a scope currently so I have not been able to look into the cylinder.



I just cleaned and moved the plugs to see if the misfire moved. They are going to be replaced. Engine is not forged but is only seeing 6-7psi. The car is not raced so I would imagine the low boost will be fine. I am just trying to eliminate possible easy fixes before really tearing things apart. After cleaning them and running for a few minutes the problem appeared to clean up. The plan is new msd wires and plugs then re-scan.
I personally prefer using Taylor plug wires as their boots clip onto the spark plugs much better. Bob
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Old Aug 10, 2011 | 07:27 AM
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I have MSD wires and i never know for sure if they are on all the way, o may switch them out for some taylors.
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Old Aug 10, 2011 | 07:30 AM
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Originally Posted by allout06
I have MSD wires and i never know for sure if they are on all the way, o may switch them out for some taylors.
That's what I have encountered, you can hear the Taylors click on. Bob
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Old Aug 10, 2011 | 07:47 AM
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only way i know i got them all is if the car fires up and runs right lol.... so far, im a pretty good guesser haha
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Old Aug 10, 2011 | 08:40 AM
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Originally Posted by Bob@BruteSpeed
That's what I have encountered, you can hear the Taylors click on. Bob
Do you sell them Bob and do you have a link? I can never tell if I have #6 or #8 seated so I'm left to start the car and scan those cylinders to see if they are firing.
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Old Aug 10, 2011 | 08:43 AM
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Originally Posted by The Alchemist
Do you sell them Bob and do you have a link? I can never tell if I have #6 or #8 seated so I'm left to start the car and scan those cylinders to see if they are firing.
Yes, I have the Taylor 74244 http://shop.brutespeed.com/Taylor-74...ylor-74244.htm and 98003 http://shop.brutespeed.com/Taylor-98...ylor-98003.htm in stock. Thanks. Bob
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Old Aug 10, 2011 | 09:48 AM
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Which ones click in Bob or do they all click?
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Old Aug 10, 2011 | 09:54 AM
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Originally Posted by The Alchemist
Which ones click in Bob or do they all click?
So far all the Taylors I have used have clicked. Bob
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Old Aug 10, 2011 | 11:53 AM
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Good call bob, I use taylors and like the positive engagement aswell
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Old Aug 10, 2011 | 12:14 PM
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What other plugs do you guys reccomend for a low boost car? I saw br7ef's mentioned, anything else?
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