jwarwick
Member
- Joined
- August 7, 2014
- Messages
- 12
- Reaction score
- 0
- City, State
- The Thumb, Michigan
- Year, Model & Trim Level
- 2003 Explorer XLT 4.6
I have a 2003 Explorer with the 4.6 and 135k. About 3 months ago, while the Ex was traveling between 45-55mph, it would feel like the trans was slipping in and out of gear. I had my mechanic look at it and he replaced a coil pack and spark plugs and this fixed that issue.
A week later, while coming to stop in a parking lot, the Ex stalled on me. I put her in park and she started right back up. She would continue to stall while decelerating. I cleaned the IAC but the stalling continued, so I replaced the IAC valve and TPS, and cleaned the MAF and throttle body. This fixed the stalling issue.
Everything was great for a month or so, then the Ex started “idle surging” when I would come to a stop. When I would hit the brakes, the idle stays up, and the Ex fights you (wants to accelerate) until you get to about 5mph, and then the idle will suddenly drop to normal, and you come to an abrupt stop because you had to push the brakes so hard to fight the engine.
No codes have been thrown since this started either.
I cleaned the PVC lines and the two rubber elbows that go into the intake manifold. Neither the lines nor the elbows looked worn or bad. I have checked for vacuum leaks with carb spray and didn’t find any.
With the IAC disconnected, the Ex will idle like normal until you apply pressure to the brake, then the RPMs will lower to 500 and it tries to stall.
Could I have a bought a bad IAC valve??
Could it be something with the MAF or EGR valve?
Also, ever since I replaced the IAC, when I start a cold engine, the idle jumps up to about 1500 RPMs for 30-40 seconds, then it jumps up to about 1800 RPMs and then drops immediately down to a normal idle (700-800). i'm not sure if this is a related issue or not.
Any help would be appreciated! thanks
A week later, while coming to stop in a parking lot, the Ex stalled on me. I put her in park and she started right back up. She would continue to stall while decelerating. I cleaned the IAC but the stalling continued, so I replaced the IAC valve and TPS, and cleaned the MAF and throttle body. This fixed the stalling issue.
Everything was great for a month or so, then the Ex started “idle surging” when I would come to a stop. When I would hit the brakes, the idle stays up, and the Ex fights you (wants to accelerate) until you get to about 5mph, and then the idle will suddenly drop to normal, and you come to an abrupt stop because you had to push the brakes so hard to fight the engine.
No codes have been thrown since this started either.
I cleaned the PVC lines and the two rubber elbows that go into the intake manifold. Neither the lines nor the elbows looked worn or bad. I have checked for vacuum leaks with carb spray and didn’t find any.
With the IAC disconnected, the Ex will idle like normal until you apply pressure to the brake, then the RPMs will lower to 500 and it tries to stall.
Could I have a bought a bad IAC valve??
Could it be something with the MAF or EGR valve?
Also, ever since I replaced the IAC, when I start a cold engine, the idle jumps up to about 1500 RPMs for 30-40 seconds, then it jumps up to about 1800 RPMs and then drops immediately down to a normal idle (700-800). i'm not sure if this is a related issue or not.
Any help would be appreciated! thanks