Welcome Visitor! Please take a few seconds and SolidSnake84
New Member
- Joined
- Sep 5, 2008
- Messages
- 38
- Reaction score
- 1
- Points
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- Location
- Stephens City, VA
- Vehicle Year
- 2006
- Make / Model
- Ford
- Transmission
- Manual
Hey guys - i've never posted a question on here dealing with Explorers, so this is my first one. My wife's explorer is a 1998, 4.0 SOHC, has 165,000 miles. We have had this car about 5 years and it has been great, 4X4 works, has been very dependable and reliable - the only thing i've had to do to it other than normal maintenance is put a new fuel pump in last summer.
I first started having trouble with it about 2 weeks ago. The truck always starts up fine cold or hot. Sometimes, the idle when cold will go into "hunt mode", meaning it revs up to about 1000, then drops to 500, stumbles, then goes up to 1000 for a few cycles until it gets warm and then it idles smooth.
I noticed last week, that it will intermittently have no power, meaning, that i can floor the gas, but the truck accelerates VERY Slowly....it almost feels like a rev limiter or something is kicking on because the motor is not capable of getting beyond 2,000 RPMS. Then, like nothing it "snaps out of it" and will throw you back in your seat so hard it feels like you've been rear-ended. It has done this 2 times so far in the past week. It only occurs for a couple of seconds, and then it's over. The truck will run perfect for however far your going.
I am not getting any codes (check engine light could be blown or disabled by previous owner), and when it is "running bad" i do not smell any excess fuel, or notice anything strange. Here is what I have done to try and remedy the problem, with no change: New plugs, new wires, new coil packs. Did an upper induction service with BG machine, also removed and cleaned IAC valve (it didn't look bad or full of carbon), cleaned MAF sensor (it was a little dirty but didn't look bad). Getting better MPG now for sure, but still no change in "surging problem". Have not yet replaced O2 sensors, I do not know how much of a difference they really make, or if they could be my problem..... Can anyone help?
I first started having trouble with it about 2 weeks ago. The truck always starts up fine cold or hot. Sometimes, the idle when cold will go into "hunt mode", meaning it revs up to about 1000, then drops to 500, stumbles, then goes up to 1000 for a few cycles until it gets warm and then it idles smooth.
I noticed last week, that it will intermittently have no power, meaning, that i can floor the gas, but the truck accelerates VERY Slowly....it almost feels like a rev limiter or something is kicking on because the motor is not capable of getting beyond 2,000 RPMS. Then, like nothing it "snaps out of it" and will throw you back in your seat so hard it feels like you've been rear-ended. It has done this 2 times so far in the past week. It only occurs for a couple of seconds, and then it's over. The truck will run perfect for however far your going.
I am not getting any codes (check engine light could be blown or disabled by previous owner), and when it is "running bad" i do not smell any excess fuel, or notice anything strange. Here is what I have done to try and remedy the problem, with no change: New plugs, new wires, new coil packs. Did an upper induction service with BG machine, also removed and cleaned IAC valve (it didn't look bad or full of carbon), cleaned MAF sensor (it was a little dirty but didn't look bad). Getting better MPG now for sure, but still no change in "surging problem". Have not yet replaced O2 sensors, I do not know how much of a difference they really make, or if they could be my problem..... Can anyone help?
