BTVelocity
Member
Just bought my 1st Expedition ever! A 2001 AWD Eddie Bauer 5.4L. Bought it 4 months ago. Unfortunately, I fell for the line that goes like this: "it just needs a little tune-up to make the engine run smoother at idle and stop the Shaking at 40 mph….."
It had a roughness at idle that shook the whole vehicle. Also had a violent "engine compartment Shaking" between 40-50 mph. It’s got 204,000 miles. I bought it anyway and have spent the last 4 months working on it in order to recover from this bad choice.
Here's what I've done: New air filter/fuel filter, checked fuel pressure (good), all new spark plugs with 0.054" gaps, all new coils, new PCV valve and all new fuel injectors. New tires/balanced. Checked U-joints, minimal 1 mm movement at one of the front joints. Transmission fluid seems new-ish, clear red, does not smell burnt, good level.
The good thing is that after each major change done above there was significant improvement in the idle, so much so that it is now about 90% normal, much smoother and really smooth/fast acceleration.
My main concern now is the pronounced "shuddering or shaking" of the engine compartment as soon as the RPM's drop from 1800 to 1500 as though at a shifting point in the gears(this occurs at 40 mph). As long as I apply the throttle with the shaking between 40-50 mph, the shaking continues. If I let up on the throttle and coast, the shaking stops.... accelerate again and the shaking restarts (from 40-50 mph).
If I Fly through the acceleration with a heavy pedal (not my normal style), I can zip through 40-50 mph without the shaking. Beyond 50/60/70 mph, all is fine.
Now that nothing I've done tune-up wise has helped the Shaking thing, I'm worried it could be transmission related....
I initially had codes for misfire cyl 4 and 7, as well as lean fuel condition Bank 1. But once all the repairs were done, including the fuel injector replacements, no codes have returned (not that I have driven it much…. don’t want to mess something up worse).
Another tidbit or two: I noticed over the last 2 cold days, the “Shaking” didn’t happen the first time through 40-50 mph, when the engine/trans was cold. There is also a constant moaning/groaning sound that is not affected by RPM changes. I’m thinking pulley?
Sorry for the long post. Seems like a lot of misery to me. Hopefully, some of my new Expedition friends will have some ideas.
Thanks!!!!!
Bill
It had a roughness at idle that shook the whole vehicle. Also had a violent "engine compartment Shaking" between 40-50 mph. It’s got 204,000 miles. I bought it anyway and have spent the last 4 months working on it in order to recover from this bad choice.
Here's what I've done: New air filter/fuel filter, checked fuel pressure (good), all new spark plugs with 0.054" gaps, all new coils, new PCV valve and all new fuel injectors. New tires/balanced. Checked U-joints, minimal 1 mm movement at one of the front joints. Transmission fluid seems new-ish, clear red, does not smell burnt, good level.
The good thing is that after each major change done above there was significant improvement in the idle, so much so that it is now about 90% normal, much smoother and really smooth/fast acceleration.
My main concern now is the pronounced "shuddering or shaking" of the engine compartment as soon as the RPM's drop from 1800 to 1500 as though at a shifting point in the gears(this occurs at 40 mph). As long as I apply the throttle with the shaking between 40-50 mph, the shaking continues. If I let up on the throttle and coast, the shaking stops.... accelerate again and the shaking restarts (from 40-50 mph).
If I Fly through the acceleration with a heavy pedal (not my normal style), I can zip through 40-50 mph without the shaking. Beyond 50/60/70 mph, all is fine.
Now that nothing I've done tune-up wise has helped the Shaking thing, I'm worried it could be transmission related....
I initially had codes for misfire cyl 4 and 7, as well as lean fuel condition Bank 1. But once all the repairs were done, including the fuel injector replacements, no codes have returned (not that I have driven it much…. don’t want to mess something up worse).
Another tidbit or two: I noticed over the last 2 cold days, the “Shaking” didn’t happen the first time through 40-50 mph, when the engine/trans was cold. There is also a constant moaning/groaning sound that is not affected by RPM changes. I’m thinking pulley?
Sorry for the long post. Seems like a lot of misery to me. Hopefully, some of my new Expedition friends will have some ideas.
Thanks!!!!!
Bill
