my truck developed a miss fire that comes and goes . i replaced the injectors with another set, no change. then i removed the tr55's and all had soot on them ,so i replaced them no chage all i can think of is a o2 has gone out, ist smells like fuel when it idles,the miss fire goes away at cruising speeds . any ideas ,thanx in advance
Did ya check your plug wires?
Axekick tuned, Pacesetters, Servo.
that slipped my mind i have another that i'll try .
Pull the fuel pressure regulator vacuum line off with residual pressure and see if it's leaking through the valve.
What rpm is it idling at?
Last edited by Marcus; 02-03-2010 at 11:18 PM.
My 01 4.8 had an intermittent misfire for the last several weeks. It wouldn't set the check engine light. I removed the plugs yesterday and noticed that #3 plug had signs of arcing on the porcelain. I cleaned the plug boot, applied silicone dielectric grease and replaced the plugs. Has been good so far.
Well checked the spark plugs again , they were covered in soot. Replaced tjem and fired it up .now it seems to be dumping fuel ,it just reeks of unburned fuel while it idles. What else can I try to resolve this . Thinking. About replacing the o2's.
If it's not cammed and there is a gas smell at idle, there is a good chance its the O2s. Or a dirty MAF. Something is telling it to run richer than normal...
2000 ECSB 6.0L
TORQUER V2 CAM ● COMP 918's ● 7.4 HARDENED PUSHRODS ● K&N SERIES 77 CAI ● 80mm BBK ●PACESETTER LT HEADERS AND 3'' ORY ● SUPER 40 FLOW ● 3000 STALL ● 4.10s ● BUILT 80e ● VORTEC PERFORMANCE TUNE ● MSD 8.5mm PLUG WIRES● ELEC. CUTOUT ● UD & ALT PULLEYS ● FLEX-A-LITE E-FANS ● 22" CENTERLINE STINGRAY III's ● LUND FIBERGLASS TONNEAU ● 2" LEVELING SHACKLES ● 12K HID LOWS & FOGS ● LEDs ● DEBADGED ● WHITE-FACED ESCALADE GAUGES ● KICKER 450.1 ● 2-CVR 10's ● DS60's ● K693's
i does have a cam . i also replaced the maf sensor.
Who tuned it?
2000 Silverado ECSB- 5.3 CAI, Pacesetter LTs, ORY- Pipe, Magnaflow XL, E-fan, Ported T/B , Nelson Tuned, Built 4l60e, Circle D Stall, 3.42s G80, 2-4 Drop, Hertz Highs, Rockford 501s
2004 Buell XB12s
Originally Posted by LamboDoNoMo
not to jack the thread but im running into the same problem just the last couple days...i replaced the intake gaskets, which showed signs of leaking in the number 8 cylinder, but my number 5 is dropin like crazy on the scanner only when its cold. today its getting injectors cleaned plugs changed and maybe wires...haha
2006 Trailblazer SS RWD
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