I have a stock 2001 jeep wrangler 4.0, 6 cyl with automatic transmission. I have been reading on many forums that replacing the stock airbox, hose, and filter with an after market intake such as AEM, would increase horsepower and possibly gas milage.
After looking at the stock airbox, I noticed the hose from the manifold is a much larger diameter than the 90 degree bend hose that is located in the front of the air box filter, the hose were air actually enters the filter box. Because of this, I removed the small 90 degree bend hose, which left a large hole in the front of the air box for air to enter.
Not only did I notice a much better sound from the engine, but the acceleration from a dead stop increased as well as hitting the gas at 40 mph, were it really wants to move.
After driving for 3 days I got check engine light code PO432. I understand this has to do with the cat being out of the spec range. What does this code mean in non-technical terms? Do you think it was caused by removing the small intake pipe? Since I haven't put many miles with on the jeep with the small intake off, what effect do you think this will have on the gas mileage?
After looking at the stock airbox, I noticed the hose from the manifold is a much larger diameter than the 90 degree bend hose that is located in the front of the air box filter, the hose were air actually enters the filter box. Because of this, I removed the small 90 degree bend hose, which left a large hole in the front of the air box for air to enter.
Not only did I notice a much better sound from the engine, but the acceleration from a dead stop increased as well as hitting the gas at 40 mph, were it really wants to move.
After driving for 3 days I got check engine light code PO432. I understand this has to do with the cat being out of the spec range. What does this code mean in non-technical terms? Do you think it was caused by removing the small intake pipe? Since I haven't put many miles with on the jeep with the small intake off, what effect do you think this will have on the gas mileage?