1994 gmc seirra k1500 4.3 engine 4x4 hesitation when I accelerate. I have changed plugs, wires, distrubutor cap, rotor button, egr, ignition coil, TPS, knock sensor, O2 sensor, fuel filter, checked fuel pressure that remained consistant even while driving. I can see an even spray on the fuel injectors at idle and when I rev the engine up. but I have not performed any tast on the fuel injectors or thefuel pressure regulator.
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Rough running, hesitation, and/or jerking when accelerating
In some cases, there may be performance problems, such as dying at stop signs or rough idling, hesitation, misfires or lack of power (especially during acceleration), and a decrease in fuel economy
Common Problems That Trigger theP0300
Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable)
Incorrect ignition timing
Vacuum leak(s)
Low or weak fuel pressure
Improperly functioning EGR system
Defective Mass Air Flow Sensor
Defective Crankshaft and/or Camshaft Sensor
Defective Throttle Position Sensor
Mechanical engine problems (i.e.-low compression, leaking head gasket(s), or valve problems
What about the fuel pressure, have you monitored the fuel pressure. How about the MAP sensor, have you recorded the siganl when this happens and the O2 sensoras what are they doing when this happens. You have little testing just throwing parts at it from what i can see. Tinme to give a professional a chance here if you ask me.
i have a 1988 k1500 seirra truck, that will idle fine then it will choke its self out and stall out.(i have a new egr synolyd,new egr, a 1992 ecm pulled from a junk yard,new cap,rotor, plugs wires,distributorand, a new coil,,map sensor,and a 2 year old tps sensor; and the copression is 140- 155 in all cylinders), but it wont say running, what can i look at next to help it run and stay running?
when mine was pulling up the code it pulled a 12,33, and45
check vacuum lines, near air canisters and air filters etc, usually rubber hoses, may be cracked ,split, dry rot enough to let air in. may as well start there.
My 1996 Astro does the same thing... It has new fuel pump, fuel filter, plugs, wires, cap, rotor, maf sensor, ignition coil, alt., battery, cat converter, im stumped...
By "OVERDRIVE '' . are you meaning the TCC ( torque converter clutch ) is engaged ? and if so, when you increase RPM's to accelerate, it should disengage otherwise causing a noticeable hesitation. Hope this helps
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