I have a 2003 Chevy Astro Cargo Van, 4.3L 6cyl RWD.
I have been having this problem for a month now. The problem is that the van loses power when accelerating hard, for example when trying to pass another car on the freeway, going uphill, and when driving on the streets as well. Sometimes it drives like normal, and then suddenly loses power when I accelerate hard. My mechanic has check numerous things on the car: Changed MAF from a salvaged van, fuel pressure good, cat seems fine it has no rattle no black smoke no backfire. there is a code that pops up for something wrong with the vacuum. the check engine and ses lights go on when problem occurs. and the problem occurs when the car is warmed up to operating temp, not when cold. What can cause this to occur?
o2 sensor? vacuum leak? fuel injectors? but i am thinking that if any of this is the problem, the engine would misfire, right? the engine does not misfire by the way.
I hope someone can help me with this. thanks to all.
I have been having this problem for a month now. The problem is that the van loses power when accelerating hard, for example when trying to pass another car on the freeway, going uphill, and when driving on the streets as well. Sometimes it drives like normal, and then suddenly loses power when I accelerate hard. My mechanic has check numerous things on the car: Changed MAF from a salvaged van, fuel pressure good, cat seems fine it has no rattle no black smoke no backfire. there is a code that pops up for something wrong with the vacuum. the check engine and ses lights go on when problem occurs. and the problem occurs when the car is warmed up to operating temp, not when cold. What can cause this to occur?
o2 sensor? vacuum leak? fuel injectors? but i am thinking that if any of this is the problem, the engine would misfire, right? the engine does not misfire by the way.
I hope someone can help me with this. thanks to all.