When I am ideling in PARK, every 3-5 seconds it feels like the RPM's are dropping just a very small bit. I can't see the RPM guage dropping, but it I will notice a small vibration lasting only about a second and then goes away. When I am in DRIVE or REVERSE, it doens't do it. I didn't know if this is something normal that I am just now noticing or if there could be something else going on. Any ideas? The truck runs strong with no hesitation or anything. It's a 2004 4.8 liter. Thanks
2010 Silverado ECSB LS 4x4. Only mods so far are a K&N drop in filter and a Rough Country 2" front level kit
i have the same thing on my 99 with 126k on the clock. ive just have given up and just let it go. i think mine is a bad plug or a bad injector....both which will be brand new in a few weeks.
other than that i tried the seafoam thing, i think it might be a plug going bad, or i guess it depends on your milage, i think it could be one of my injectors, but the truck runs just fine and it has never thrown any codes.
1999 GMC Sierra SLE ECSB .... 5.3L w/ Slight Performance Tune / True Duals with Flo Pro Glass Packs.
Project ''Bad Company'' Future = 6.0L (Forged Internals) / Boost (TVS) / 4L65E LvL 5 / AWD Conversion / Full LT's with Cats / Methanol Injection / Lowered 2" / SS Rims / Frame Up resto
Officially Employed!!!
my 04 has 73,000 miles on it and hasn't thrown any codes.
Sounds like a burp from a fouling plug or maybe a clogged FPR. Do the easy things first... New plugs (properly gapped), then FPR and fuel filter.
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
+1. Also if you have TR-6 plugs they tend to idle a little ruff. New plugs, and check the wires and make sure they arent torn at the top of the boot, were the wire meets the boot. Some times they tear when you take them off the plug.Originally Posted by txarkitekt
They are the original plugs so i'm sure there is some fouling on them. I was reading up on the new E3's and I also saw them on Horse Power TV and they gave better fuel mileage and a 6 hrsepower gain. Yes? No? Any input on good plugs? What is the FPR? Fuel Pressure Regulator?
yes i think the FPR is fuel pressure regulator....which by if you try those E3 plugs before friday let me know how they work out.
i was just gonna get some bosch or NGK plugs when i do the swap, and im also doing the fuel filter this weekend.
1999 GMC Sierra SLE ECSB .... 5.3L w/ Slight Performance Tune / True Duals with Flo Pro Glass Packs.
Project ''Bad Company'' Future = 6.0L (Forged Internals) / Boost (TVS) / 4L65E LvL 5 / AWD Conversion / Full LT's with Cats / Methanol Injection / Lowered 2" / SS Rims / Frame Up resto
Officially Employed!!!
yes, FPR is fuel pressure regulator.
Yeah--try out the E3 plugs. I am interested to hear some personal feedback. I saw the section on Horsepower TV also...
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 think they were quoting the E3 press release. I would like to see someone run a tank full of fuel on new $.99 NGK plugs and then switch to the E3s and drive the same exact route in the same manner and compare the fuel mileage. Sure it will be an expensive test but the payout in the long run to everyone here will be 10 fold.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
+1. I would try them but I doubt they work well with nitrous.
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