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Turbo 5.3 on low boost, as high as 11psi.
started misfiring, pulled plug wires off and found one burnt open on the header, and replaced them with lt1 wires to stray away from them setting on the headers. Also replaced plugs with br7ef, gapped at .025. Now the motor feels weak as hell and even in boost it feels very low on power. Afr checks out fine. Only cruised on it for 5 miles with new plugs and wires, its kind of a mess due to the wires going down and around the header but anyone got any opinions?
Turbo 5.3 on low boost, as high as 11psi.
started misfiring, pulled plug wires off and found one burnt open on the header, and replaced them with lt1 wires to stray away from them setting on the headers. Also replaced plugs with br7ef, gapped at .025. Now the motor feels weak as hell and even in boost it feels very low on power. Afr checks out fine. Only cruised on it for 5 miles with new plugs and wires, its kind of a mess due to the wires going down and around the header but anyone got any opinions?
would personally start with valvespring seat pressure and suitability to combo. then move onto coils and leads.
what does your wideband and 02 sensor mV do when its faulting compared to before. single turbo cars with decent cams are very hard to hear a single cylinder misfire on. ive been caught 3 times with running on 7. only power comparison made it obvious. 7 cylinders on a car making 972rwhp (on 8) made 788rwhp (on 7) then we found disconnected plug lead. fitted it and power straight back. car sound didn't change on 7 and power run was clean also
Well i checked o2s on scanner, they are running fine. But at cold start it idles really lean to where afr isnt reading it past 18, then dies, unless i give it some gas. It keeps an idle when warmed up.
i also checked for spark while it was running, and my tester doesnt pick up any spark on the lt1 wires but im getting spark at the oem wires i used.
(using 3 lt1 plug wires, 5 oem)
Going to let it cool down and maybe swap out those lt1 wires again and see if it fixes it.
also--- i get an arcing sound when i first crank it to start. I seperated all the wires from touching eachother but still seems to make that sound. Cant see any sparking when running tho.
Anyone else have this problem with using the lt1 wires? Maybe the coil ends are set up different? They slid on a little tight but worked
Reading through this I was thinking the same thing. Step 1, undo what you changed, i.e. the plug wires. They could have a different impedance than LS wires. Do you hear the double click when connecting to the coils? Maybe they aren't fully seating to the coil and the coil output is arcing to the plug wire, or same thing on the spark plugs end.
Reading through this I was thinking the same thing. Step 1, undo what you changed, i.e. the plug wires. They could have a different impedance than LS wires. Do you hear the double click when connecting to the coils? Maybe they aren't fully seating to the coil and the coil output is arcing to the plug wire, or same thing on the spark plugs end.
hmmm..this could be a big part of it. The lt1 wires fit onto the coil packs real tight and they do double click, but end up backing up a click from sliding down a tad. Will that really trigger an arc? I will definently try to stick with my oem wires and sleeve them better. Ill swap them and get back to you guys about this, thanks!
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Low on power 
