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Discussion Starter #1
Hello,

I noticed this the other day and I am not sure if it's a tyranny problem of an engine issue. If my '05 Excursion is stopped such that it has to climb say over a rock, in either forward it reverse, it can't get going. Say for instance I parked the vehicle such that the front tires are sitting against a curb that's like 6 in tall. If I put the vehicle and drive and step on it even if I floor the gas, or diesel as the case may be, it won't go over. One thing I noticed is that the engine doesn't fully rev. It doesn't bog, exactly, it just doesn't get up in a high RPMs. Now if I put it in reverse and back up even just a few inches, then stomp on it the engine revs just fine and it climbs over. The same thing happens in reverse. One time it happened when there wasn't even an obstacle but I was parked with the front end pointed downhill. I needed to back up and out and it wouldn't go up a maybe 10 degree angle incline. I had to roll forward until I found a flat spot and then the engine would rather enough to get up and over the slight incline backwards.

Any ideas? I keep this rig maintained and have never had a serious issue with it. I've never even towed more than a ton of trailer with it. 160k miles.
 

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Sounds like you're not building boost under load. Does it smoke black when this happens?
There's a lot of areas that could be causing boost problems. CAC Boots, plastic cold side pipe, up-pipes, turbo unison ring and veins sticking, bad VGT solenoid or wiring, clogged cat, clogged EBP tube or bad EBP sensor. Maybe a few more.

It could be the trans, but I think you'd see more problems along with it. However, if you keep trying to start off like that without fixing the problem, you may well hurt the trans in the long run.
 

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Discussion Starter #3
Thanks.

No black smoke at all. I had the turbo and injectors replaced 50k miles ago. Where should I start troubleshooting?
 

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If there's no smoke, then your problem may not be boost, it may be an HPO problem. With the info given so far, I couldn't tell you where to start diagnostics other than getting a monitor to see the viral statistics of the engine when you're experiencing the problem. Maybe @kaya @Hydro @waggonerj @LoxDiesel or one of the other more experienced techs can help.
 

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Discussion Starter #5
Thanks G8orFord. Yes, hopefully more people will chime in with more advice. I will take all I can get!
 

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Thanks G8orFord. Yes, hopefully more people will chime in with more advice. I will take all I can get!
What year?
Have you scanned for codes? If not, start there. Use a device capable of viewing manufacturer specific dtc's
 
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