2000 mountaineer odd issue
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2000 mountaineer odd issue
Hi guys I am sorry if this is already discussed I wasn't sure what to look for. Ok this is the issue, I have a 2000 mountaineer that has an issue with idle after I drive it for a while (like 45 min to an hour). I had someone hook up a fuel pump pressure tester to it about a week ago and it would drop when the idle issue would start. He seemed to think it was the fuel pump, but I have never had a fuel pump act like this. I have ruled out vacuum leak, fuel pump relay, IAC, MAF, TPS, and the coil pack. As you can tell I have put a lot of money towards this and really need to pin it down. This is where I am now, MAP sensor, EGR valve, Gas Recirculation Pressure Feedback Sensor. I have no idea what it could be at this point any help would be appreciated thanks in advance. oh and no lights at the moment.
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From: Cedar Rapids, IA
Does your Mountaineer have the 4.0L V6 or the 5.0L V8?
How did you rule out a vacuum leak? Do you have the ability to monitor the PCM value for the engine coolant temperature (not the gauge in the instrument cluster) when the idle starts to act up? Does the truck run fine at engine speeds other than idle? Have you tried cleaning the back side of the throttle plate?
-Rod
How did you rule out a vacuum leak? Do you have the ability to monitor the PCM value for the engine coolant temperature (not the gauge in the instrument cluster) when the idle starts to act up? Does the truck run fine at engine speeds other than idle? Have you tried cleaning the back side of the throttle plate?
-Rod
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Does your Mountaineer have the 4.0L V6 or the 5.0L V8?
How did you rule out a vacuum leak? Do you have the ability to monitor the PCM value for the engine coolant temperature (not the gauge in the instrument cluster) when the idle starts to act up? Does the truck run fine at engine speeds other than idle? Have you tried cleaning the back side of the throttle plate?
-Rod
How did you rule out a vacuum leak? Do you have the ability to monitor the PCM value for the engine coolant temperature (not the gauge in the instrument cluster) when the idle starts to act up? Does the truck run fine at engine speeds other than idle? Have you tried cleaning the back side of the throttle plate?
-Rod
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ok thanks any ideas on what could be causing it
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so its something in the pcv system? id like to go on longer trips but it gets to a point where i just have to stop for an hr or so before i can continue
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Logistics Pro
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From: Cedar Rapids, IA
No, not totally. Carbon build up on the back of the throttle plate is something that happens. The PCV system will allow oil vapors in to the intake, that's something that happens. The PCV system is probably not the issue if whatever your idle issue is happens only after the engine is warm.
I skimmed back through the above posts and I don't see a good description of what the idle issue is. Does the truck idle rough? Does it stall?
-Rod
I skimmed back through the above posts and I don't see a good description of what the idle issue is. Does the truck idle rough? Does it stall?
-Rod
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No, not totally. Carbon build up on the back of the throttle plate is something that happens. The PCV system will allow oil vapors in to the intake, that's something that happens. The PCV system is probably not the issue if whatever your idle issue is happens only after the engine is warm.
I skimmed back through the above posts and I don't see a good description of what the idle issue is. Does the truck idle rough? Does it stall?
-Rod
I skimmed back through the above posts and I don't see a good description of what the idle issue is. Does the truck idle rough? Does it stall?
-Rod
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Ive never had an issue with starting it back up usually starts without an issue.
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From: Cedar Rapids, IA
I'd agree with your initial instinct, doesn't sound like a fuel pump issue. Since it almost sounds like something related to when the engine gets up to operating temperature, having a scan tool with datastream mode and monitoring several engine parameters real time might be the most efficient way to diagnose this. For the amount of parts you've already invested, you could probably get a pretty nice scan tool with datastream mode....
-Rod
-Rod
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I'd agree with your initial instinct, doesn't sound like a fuel pump issue. Since it almost sounds like something related to when the engine gets up to operating temperature, having a scan tool with datastream mode and monitoring several engine parameters real time might be the most efficient way to diagnose this. For the amount of parts you've already invested, you could probably get a pretty nice scan tool with datastream mode....
-Rod
-Rod
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From: Cedar Rapids, IA
You get a lot of bang for your buck from the Autel scan tools. Autel also sells these under the Cen-Tech brand available from Harbor Freight. For example, the Autel AL619 is available for $140 or less online and will do data stream and can also access ABS and airbag codes.
-Rod
-Rod
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You get a lot of bang for your buck from the Autel scan tools. Autel also sells these under the Cen-Tech brand available from Harbor Freight. For example, the Autel AL619 is available for $140 or less online and will do data stream and can also access ABS and airbag codes.
-Rod
-Rod
