1997 Grand Cherokee Limited sometimes dies when slowing down to P
This is an idling problem. Whenever the shift selector is in N or P the engine is running free of the torque converter load, so the rpms in these two positions are higher than in 1,2 or 3. If the engine is runing and you are driving say in position 1 and come to a stop and the engine stalls, you need to clean the Idle Air Control valve. This valve provides the engine with additional air anytime the throtle valve is clossed, such as when lifting your foot off the accelerator pedal, while driving. If the valve is clogged (with dirt, fumes, sand, dust), its moving parts do not move freely (or move erratically) under the comand of the Power Train Control Module and so with no additional air feeding the engine when needed, it stalls. The IAC valve is located on the side of the throat of the throtle body, under the air intake hose. Unscrew the air intake hose nut that is on top of the throtle body. Remove the air intake hose so that you can habe better acces to the IAC valve. Next, locate the Idle air control valve and unplug its connector. Unscrew all star screws of the valve and take it out. Apply liquid contact cleaner inside the IAC with a spray. While doing that move with your fingers the movable pieces the valve has, spray it enough liquid to get all dirt out. When the liquid comes out clean, let it drip until dry. The liquid dries fast. When dry, reassemble all. You are all done. To prevent this from happening again, make sure the Air intake hose is well nested on the throtle body. It has black rubber ring around that prevents dust from coming in and clogging the IAC, make sure the ring is there. IAC valves are buit rugged, once clean they are capable of providing many years of trouble free service. Just mind to have only filtered air coming into the throtle body, not dust or smoke. Put the hose well on its place.
Jan 12, 2010 |
1997 Jeep Grand Cherokee