View Poll Results: Cylinder 7 fails first because the.....
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Why does number 7 fail first (tech only)
Jul 22, 2008 | 05:26 PM
#31
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How do I change this text
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From: Behind the TIG welder
LMAO, I guess we are all "Do-it-yourselfers".....
I think Thunder hit it... all of the above.....
Jul 22, 2008 | 05:50 PM
#32
When I ran my stock 6.0L with the truck intake #7 and #8 spark plugs was by far the the cleaner plug (white) when I would check them. On my L92/L76 set up #7 and #8 sparkplugs have some of the best color (lt tan), while #3 and #4 are my cleanest sparkplugs (real lt tan)? Go figure?
Jul 22, 2008 | 09:40 PM
#33
Say you are spraying methanol and #7 is getting the most airflow. Would the truck intake keep the methanol atomized enough to deliver the right proportion to #7? Or is the AFR drop you see on the wideband coming from the other cylinders?
Jul 23, 2008 | 10:26 AM
#34
On The Tree
Joined: Dec 2005
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I have the factory temp sender in the drivers front, and an electric temp gauge in the passenger rear. normal driving the rear gauge is 10+ degrees hotter, but when I run it through the gears, full throttle...the rear spikes over 200 and the front sender reads 170........as soon as I let off the gas the rear levels back out..
When I'm driving down the road @ cruising speeds and logging with EFI Live the computer always reads around 192 F and the Autometer gauge reads around 175 F. I've never watched it while I was under full throttle but when I sit in traffic and it starts to warm up the computer reads around 202 F and the Autometer reads around 200 F.
I wondered if this difference from side to side was because the way the coolant entered the engine.
Just food for thought
Jul 23, 2008 | 02:52 PM
#35
Running a stock truck intake my plugs all looked the same (light tan spot on insulator next to intake valve) but #7 insulator was pure white. This plug reading indicates a lean cylinder. After installing a Radix with their manifold and brand new plugs I rechecked all plugs at 1K. #7 insulator was still pure white and the rest looked the same as with stock manifold. This leads me to believe there is a cooling issue with #7 and it's running hotter than the rest. Would higher temps around #7 cause this plug to indicate a lean burn? I originally thought #7 plug indicating lean may have been caused by air flow through stock manifold but this disproves that theory for me. I'm Going to try a 170*~180* T-stat for cooler engine temps. and maybe better piece of mind. I want to minimize my chances of 
#7 under boost.
#7 under boost.
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