August 4, 2010i got a 2001 silverado 1500, ext cab, long box 4x4, 4.8L with a built 4L60E, under a hard acceleration or up hill under load i get a hesitation, or pulsing. im pretty confident its not my tranny .. it was built up about 20000kms ago. i replaced plugs,wires, airfilter, fuel filter all in the past week, it passed e test a few months ago with crappy parts no problem, with the check engine light on. egr seems to be fine, pcv also seems fine, iv heard the injectors clog up fairly often on these trucks? i was thinking fuel pressure regulator or cloged injectors .... can any of you guys give some input , got no codes up and i have a unlimited suply of tools if need be :p
Forums : Silverado (c/k) (1999 - 2006) : lag, hesitation, sputter (2524 Views)
August 4, 2010Clean the MAF sensor.... :
August 5, 2010Cleaning the MAF sensor has worked for me in the past.
August 6, 2010you just buy a can of stuff and spray it a few times and its good to go?
August 13, 2010cleaned maf and tb, new plugs, wires, air filter, fuel filter, it only lags or surges around 2250 .. lay it to the floor and it will haul ass .... keep it around cruising speed and it does ok .... on a hill it surges too, what can cause that?
August 14, 2010what plugs are you running? gap? what about your cats?
August 14, 2010it started with the plugs the dealer put in ac delco somthing or another, running ngk iridiums now, new ngk wires, i never thought about my cats .. how would that make the engine surge at partal throttle under a load?
August 14, 2010your fuel pump could be going bad, i had that same problem tried everything to fix it then one day the truck shut off on my way home and it was the fuel pump
August 14, 2010well im on the edge between cats and fuel pump ... just checked out my books from work and cat. failure gives me almost hte same symptoms but when my brothers truck lost its fuel pump it acts the same way some times ... think im going to get a new fuel pump and gut cats
August 16, 2010fuel pump is dead LOL do it have the quick disconects on top of the tank or something else?
August 18, 2010so 2 days ago when i pulled into my driveway the peddle was on the floor and it was barly crawling in, sputtering, missfiring, jerking the whole thing .... replaced my fuel pump and it will wick up ... it got power but still jerks and sputters and missfires .. .i think i have alot of issues resulting from neglect .... what else can be causing my problems?
new: air filter, plug wires, plugs, fuel filter, fuel pump, cleaned maf and cleaned throttle body.
friday im cutting my cats off for good and gonna run me some sea foam through it,
im thinking it could be fuel pressure regulator but thats my last resort guess