View Poll Results: Cylinder 7 fails first because the.....
Engine firing order
0
0%
Voters: 49. You may not vote on this poll
Why does number 7 fail first (tech only)
07-22-2008, 05:26 PM
#31
How do I change this text
Thread Starter
iTrader: (26)
Join Date: Jan 2005
Location: Behind the TIG welder
Posts: 7,294
Likes: 0
Received 2 Likes
on
2 Posts
LMAO, I guess we are all "Do-it-yourselfers".....
I think Thunder hit it... all of the above.....
07-22-2008, 05:50 PM
#32
11 Second Club
iTrader: (1)
Join Date: Oct 2005
Location: Ms
Posts: 416
Likes: 0
Received 0 Likes
on
0 Posts
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?
07-22-2008, 09:40 PM
#33
TECH Addict
iTrader: (10)
Join Date: Nov 2005
Location: Way out there
Posts: 2,199
Likes: 0
Received 0 Likes
on
0 Posts
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?
07-23-2008, 10:26 AM
#34
On The Tree
Join Date: Dec 2005
Posts: 126
Likes: 0
Received 0 Likes
on
0 Posts
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
07-23-2008, 02:52 PM
#35
TECH Apprentice
iTrader: (2)
Join Date: Dec 2004
Location: Roch. NY.
Posts: 390
Likes: 0
Received 0 Likes
on
0 Posts
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.
Thread
Thread Starter
Forum
Replies
Last Post
