ok guys another prob. i got a low rpm miss in first and second gear and third. misses like sputtering at 2500-3500 rpm, when i stomp it the missing stops. then wehn im cruisin at 55-70 in OD it does it slightly. i changed fuel filter, wirtes and plugs. i put stock autolites in it that are crap. could plugs be causing a miss? or reg grade gas and crappy plugs? its all stock otehr than gutted cats and flows.
96 Silverado rcsb
5.7l Vortec
Exterior: 2 inch drop shackles, Centerline Titan 20" Wheels, clear lights, Debadged.
-Exterior to come: 2-4 drop, Tinted windows, Cowl hood, Green Calipers
-Performance mods: Flowmaster True Dual exhaust
-Performance to come: Tune, CAI, Cam, Spray, Posi, gears, stall, headers.
sounds like dirty or clogged injectors, run some fuel system cleaner through the tank and see if that helps. You can use Seafoam in the tank also, thats always worked as a good injector cleaner to me.
Chris
2009 Silverado, HPTuners, all stock.
put seafoam in the gas tank or a vacum line
96 Silverado rcsb
5.7l Vortec
Exterior: 2 inch drop shackles, Centerline Titan 20" Wheels, clear lights, Debadged.
-Exterior to come: 2-4 drop, Tinted windows, Cowl hood, Green Calipers
-Performance mods: Flowmaster True Dual exhaust
-Performance to come: Tune, CAI, Cam, Spray, Posi, gears, stall, headers.
i hate reg gas......
96 Silverado rcsb
5.7l Vortec
Exterior: 2 inch drop shackles, Centerline Titan 20" Wheels, clear lights, Debadged.
-Exterior to come: 2-4 drop, Tinted windows, Cowl hood, Green Calipers
-Performance mods: Flowmaster True Dual exhaust
-Performance to come: Tune, CAI, Cam, Spray, Posi, gears, stall, headers.
A free flowing exhaust will cause you problems with a stock tune. I am surprised you don't get convertor inefficiency errors being reported to the PCM since your cats are gutted. Time for your first tune, maybe. Definitely do the Seafoam through a tank of fuel. Worst comes to worst you may have a coil going out or a short in a power wire going to the coil.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
my SES light is on due to the gutted cats. I dunno wut it is but i want it fixed.
96 Silverado rcsb
5.7l Vortec
Exterior: 2 inch drop shackles, Centerline Titan 20" Wheels, clear lights, Debadged.
-Exterior to come: 2-4 drop, Tinted windows, Cowl hood, Green Calipers
-Performance mods: Flowmaster True Dual exhaust
-Performance to come: Tune, CAI, Cam, Spray, Posi, gears, stall, headers.
You're running lean man. That happens when you gut your cats and add a free flowing exhaust or run low fuel pressure. You're going to have to get that fixed before long. It's hard on the engine to run lean, burns stuff up. I'm not 100% sure it's causing your miss but I'm sure it has something to do with it. Running lean too long is as bad as a burned valve, it will eventually cost ya.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
http://i10.photobucket.com/albums/a1...dited-copy.jpg
2007 Sierra crew 5.3 4wd, stock for now
2004 Sierra scsb 5.3 - sold
02 Z28 SLP cold air pack, Corsa exh, Center Force dual friction + 23 lb flywheel
66 Chevy C20 (collecting dust)
well changed cap, rorotr button, checked all plug n wires. still does it. the part wehre cap scres in to dist is cracked but on outside front. we hooked on scan tool and drove it till it missed and it said cyl 1 misfire, then we swapped wire 1 with wire 2(cyl i mean) and then 2 6 and 3 missed. whast the poroblem? its makin me mad! all help appreciated.
96 Silverado rcsb
5.7l Vortec
Exterior: 2 inch drop shackles, Centerline Titan 20" Wheels, clear lights, Debadged.
-Exterior to come: 2-4 drop, Tinted windows, Cowl hood, Green Calipers
-Performance mods: Flowmaster True Dual exhaust
-Performance to come: Tune, CAI, Cam, Spray, Posi, gears, stall, headers.
Maybe the coil is shorting out? They'll do that before they finally crap out. With the lights out, in the dark, run the engine and watch for halo blue light being emitted around the ignition coil.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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