Guys, need some help with this as I have run out of options. 04 Envoy with a 4.2 is what I have.
Since late summer the truck has been really hard to cold start, rough idle, hesitation, loss of power. Once she warms up idle is not too bad, a bit high at times. Sometimes takes 5-10 tries to get a cold start. Also, you kind of have to leave the gas pedal alone. As soon as you hit the gas the engine will stall out during cold starts.
So far these are the part I have changed.
New SAIP solenoid, new front O2 sensor, new spark plugs, new coils, new MAP sensor, new intake manifold gaskets. I also changed the valve cover gasket since I was already halfway there.
I also cleaned the throttle body as well as swapped out to another TB just as a test.
Tested the air injection pump as well. I have good suction as well as it's blowing hard thru the pipe.
Also checked out the fuse that powers the SAIP solenoid.
Any help would be appreciated, as this is my winter truck and really want to get her back on the road.
Thanks.
Since late summer the truck has been really hard to cold start, rough idle, hesitation, loss of power. Once she warms up idle is not too bad, a bit high at times. Sometimes takes 5-10 tries to get a cold start. Also, you kind of have to leave the gas pedal alone. As soon as you hit the gas the engine will stall out during cold starts.
So far these are the part I have changed.
New SAIP solenoid, new front O2 sensor, new spark plugs, new coils, new MAP sensor, new intake manifold gaskets. I also changed the valve cover gasket since I was already halfway there.
I also cleaned the throttle body as well as swapped out to another TB just as a test.
Tested the air injection pump as well. I have good suction as well as it's blowing hard thru the pipe.
Also checked out the fuse that powers the SAIP solenoid.
Any help would be appreciated, as this is my winter truck and really want to get her back on the road.
Thanks.