Join Date: Jun 2012
GregG1968 is offline
2000 S10 4.3 Runs rough when engine is cold
I have a 2000 Chevy S10 4x4 4.3. The problem I am having is after the truck has been put away for the night around 5pm and sits all night in the garage and then when I go to drive it again the next day around 7:30am the engine is chugging when giving it gas. Once I arrive at work the truck sits again until about 1pm and you get in a it runs great. The truck comes back to work at around 2pm and sits again until 5pm and then I drive it home and it runs great. This tells me it has something to do with the truck warming up.
I have done the following
Replaced MAF Sensor
Replaced EGR Valve
Replaced Plugs, wires, Cap and rotor
Replaced TPS Sensor
Replaced Air Intake Sensor
Replaced PCV Valve
Replaced Fuel filter
Replaced Fuel Pump
Replaced 3 O2 Sensors
Cleaned entire Throttle body and checked IAC valve
The weirdest thing is sometimes the truck will run great for 4 or 5 days and then it will start acting up again.
This is driving me nuts.
I have tried checking for vacuum leaks around the intake, PCV valve, and plenum and there does not appear to be any leaks there.
It has been checked for fuel pressure.
I hope someone has some suggestions for me. The truck on has 47,500 on it and is in great shape but I need tit to run right.