Changed plugs now it misses.
03-25-2007, 09:24 PM
#1
Teching In
Thread Starter
Join Date: Jun 2006
Location: Corpus Christi, Tx
Posts: 32
Likes: 0
Received 0 Likes
on
0 Posts
Changed plugs now it misses.
I just finished changing my plugs on my 5.3, and now it misses under load. It does not miss when it is at idle just when it is under load (taking off from stop). I used the NGK TR 55s and reused the stock wires. And i gapped them to .055. 
Trending Topics
03-26-2007, 08:57 PM
#8
I doubt that your truck doesn't like the NGK's...check the tips like negativeswitches mentioned, and inspect the plugs for any visual cracks. Do you know which cylinder is missing? If you narrow it down to one cylinder, you could try switching the plug with another cylinder and see if the miss moves with it. If not do the same process with that cylinder's spark plug wire...if the miss switches cylinders, you've found your problem. (you can narrow down which cylinder is missing by unplugging injectors while it's running...the cylinder with the least amount or no change to the idle is the cyl w/ the mis)
03-26-2007, 09:09 PM
#9
TECH Fanatic
iTrader: (15)
Join Date: Feb 2005
Location: belleville, il
Posts: 1,087
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by budhayes3
I doubt that your truck doesn't like the NGK's...check the tips like negativeswitches mentioned, and inspect the plugs for any visual cracks. Do you know which cylinder is missing? If you narrow it down to one cylinder, you could try switching the plug with another cylinder and see if the miss moves with it. If not do the same process with that cylinder's spark plug wire...if the miss switches cylinders, you've found your problem. (you can narrow down which cylinder is missing by unplugging injectors while it's running...the cylinder with the least amount or no change to the idle is the cyl w/ the mis)
efi live can do a fuel inj. cyl balance test if you have or know someone that has
