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Old 06-08-2010, 06:38 PM   #1
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Exclamation YIKES! 97 F250 SHAKES! motorheads help me plz!

My 97 F250 PSD has taken to shaking like crap off and on. I suspect that it may be an issue of how the motor is (or isnt) mounted to the frame. Does this make sense and what should I look at to find the problem?
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Old 06-08-2010, 07:12 PM   #2
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The reason I am inclined to think it may be the mounting rather than the running gear (for lack of better terms) is that the shakes seem to be linked to RPM rather than movement per se. It is more common up hill and under load. Down hill even towing the vibration-shaking goes away. If you slow way down and let the shaking stop, you can sometimes speed back up (if you avoid RPMs over 2500) without it shaking.

What other details are needed to diagnosis this?
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Old 06-08-2010, 07:33 PM   #3
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Some additional information that might help...
Is the truck 4 wheel drive?
Any recent changes such as: front end alignment, new shocks, new tires, or tire rotation?
How many miles on the truck?

Steve
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Old 06-08-2010, 07:35 PM   #4
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Quote:
Originally Posted by war eagle View Post
Some additional information that might help...
Is the truck 4 wheel drive?
Any recent changes such as: front end alignment, new shocks, new tires, or tire rotation?
How many miles on the truck?

Steve
2 wheel drive, no recent changes, about 200K miles. Standard transmission
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Old 06-08-2010, 07:41 PM   #5
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Sometimes a Ujoint will act like that,jack up one rear wheel,and see if you have play in the drive shaft,if is 4x4 jack up one of the front and try the same thing. Dave
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Old 06-08-2010, 08:00 PM   #6
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Sometimes a Ujoint will act like that
I'm not sure why that would be, the vibration remains constant (relative to RPM) and is not a clunk when engaged. What am I missing?
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Old 06-08-2010, 08:15 PM   #7
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Check your engine mounts, it sounds like one my be cracked or broken.
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Old 06-08-2010, 08:16 PM   #8
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If you hold the brake firmly and let out the clutch slowly (1st gear) does the engine lift excessively on the left side? That would be typical of bad engine mount-as that mount takes most of the torque. The other mount or the rear mount at transmission could also be broken.
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Old 06-08-2010, 08:17 PM   #9
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Check your engine mounts, it sounds like one my be cracked or broken.
How does one do that?
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Old 06-08-2010, 09:11 PM   #10
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Check for a possible clogged fuel injector - a rough running diesel can feel like the truck is shaking apart. I had a shot #8 cylinder injector - fuel economy went way down - sluggish starts - idled OK but at highway speeds I had a loss of performance. All three O-rings were burned through (?) and the injector was burnt. I change my fuel filters at 15-20K mile intervals. The fuel pump went out too. I had 150K miles on the truck. This is a 7.3PSD - I would not change the vehicle for a new one, "FLO" is a great truck.
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Old 06-08-2010, 09:27 PM   #11
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Quote:
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I'm not sure why that would be, the vibration remains constant (relative to RPM) and is not a clunk when engaged. What am I missing?
I'm not convinced a ujoint IS the problem, but they are easy to eliminate...
Slack is one problem and can be found by wigglin, but look real close for rust on each cup seal...I had one cup full of needle bearings go dry, jam up and vibrate. The rusty dust coming from the cup seal was the giveaway.

One thing for sure...an ignored vibration has never fixed it's self for me...its always a clue that something is just gonna get worse...
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Old 06-08-2010, 09:29 PM   #12
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Quote:
Originally Posted by clancy_boy View Post
Check for a possible clogged fuel injector .
OK, not to be an obvious dunce, but how does one check for a clogged fuel injector?
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Old 06-08-2010, 09:57 PM   #13
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When's the last time you had yer running gear balanced?

Seriously, my work truck (provided by the company, I do NOT own this truck) is a '98 E250 van, a bona fide piece of junk because of poor maintenance. Vibrates very badly around 45 to 50 MPH. The problems IS the tires. The tires are cheap "foreign made" tires that the company won't replace because they have too much tread left on them. Corporate idiots.

I personally own a '97 & '98 F150 that will vibrate very badly if the front brake disks warp (happened a couple of times thru the years). Any reason to believe that the rotors are warped?

I would think you could have the motor mounts inspected at a shop for little or nothing.

Interesting thread. I'll be following along.

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Old 06-08-2010, 09:58 PM   #14
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How does one do that?
Be in first gear with clutch in, emergency brake on, and with the heal of your right foot push the brake pedal down hard and with your toe press the throttle a little and with your left foot let up on the clutch until it puts a load on the engine, the drivers side of the engine will try to lift up. If the mount is broke it will lift up more than an inch. Some mounts nowdays are interlocking and wont let the engine come up far enough for the fan to hit the shroud.
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