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Thread: 5.7 liter Vortec Misfiring badly
07-08-2009, 10:26 AM #11
I understand the the whole AC Delco thing, but I know when you go down to an auto parts store and get plugs they say .060 GAP for the 5.7 so why go down to .04099 K1500 Suburban LT "THE BEAST"
Hypertech III, K&N, true dual
07-08-2009, 10:48 AM #12
07-08-2009, 11:13 AM #13
- Join Date
- May 2009
- North central IN. Macy
You might want to chk those wires out again. I got a poor set from the zone 1 time yrs ago. I do not use inexpensive ignition parts anymore. Don't pay!
07-08-2009, 11:19 AM #14
07-08-2009, 02:47 PM #15
So what was the difference by going to a smaller gap, did you notice better starting, or difference in MPG or throttle response
07-08-2009, 02:54 PM #16
Everything is better. Most noticeably ilde is smoother, no more pinging/detonation, and more power overall.
Apparently, GM tried big gaps in the 70's, 80's, and 90's. And each time after a few years they issued new guidance to take the gap down to .040.
Last edited by 2COR517; 07-08-2009 at 03:05 PM.
07-08-2009, 03:11 PM #17
- Join Date
- Jul 2009
- Bradenton, FL
The problem is not the plugs, wires, cap, etc as i swapped them out already with no change. i will start preparing for the leak down test and see what it shows. thanks for all of the replys.
07-14-2009, 01:26 PM #18
- Join Date
- Apr 2009
- In a neighborhood.
07-14-2009, 01:46 PM #19
the gapping will stop the miss fire but the coolant leak is more than likely a blown or leaky headgasket or cracked head does the van ever overheat?2008 chevy silverado single cab short bed 4.3
1960 chevy apache 10 single cab short bed 3.9
1986 chevy 1 ton flatbed 5.7 (deceased)
1990 suburban regency edition 5.7 (sold
07-14-2009, 07:50 PM #20
1993 K1500 Suburban 350TBI, 378,486KMS on frame, 49,000KMS on Drivetrain. Lots of mods, built for haulin trailers and haulin @$$ :)
2000 K2500 Yukon XL 6.0L Vortec 252000KMS custom CAI, and exhaust...but not done yet.
"If you are dumb enough to do something you don't know how to do, and can't do it safely then WHEN you get hurt its your own fault...BONEHEAD"
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