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OT-F250 DIESEL PROBLEM


 
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dbNga
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Joined: 12 Jan 2005
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PostPosted: Mon Sep 10, 2007 4:27 pm    Post subject: OT-F250 DIESEL PROBLEM Reply to specific post Reply with quote

All- The "89 F250 4x4 w/80k miles that I pull my 49 8n with was showing loss of power on the hills. I replaced the injection pump and it seem to improve the start and idle but now I have a noticeable vibration around 2000 rpm. I had injectors looked at and 7 of 8 showed bad spray. Replaced all 8 and vibration still exists. Replaced injector pump again and vibration still there. What do you all think? Could this be a valve and loss of power was symptom and new pump/injectors not in the equation? I haven"t tried it in park/neutral and revved it up to 2k rpm yet. Double checked pump timing and it is right on. Thanks.
 
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Bob
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PostPosted: Mon Sep 10, 2007 4:43 pm    Post subject: Re: OT-F250 DIESEL PROBLEM Reply to specific post Reply with quote

Time for a compression check. A weak cylinder on these V-8 pickup truck diesels can cause some REALLY WEIRD vibrations at certain speeds and loads.

Manual tranny or slushbox?

Manual tranny may have "issues" with dual-mass flywheel (IF USED), and slushbox could have torque convertor "issues".
 
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dbNga
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PostPosted: Fri Oct 12, 2007 5:24 am    Post subject: Re: OT-F250 DIESEL PROBLEM Reply to specific post Reply with quote

Follow up on vibration problem I posted a while back. It turned out to be stiff u-joints. When I disconnected drive shaft from rear end, the shaft just hung in mid air, opened the joint and found rust...no sign of grease. New joints has it humming smoothly.
 
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Too Tall
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Location: High Springs, FL

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PostPosted: Fri Oct 12, 2007 5:40 am    Post subject: Re: OT-F250 DIESEL PROBLEM Reply to specific post Reply with quote

Just did the U joints on my 1500 and it made a big improvement in the mysterious vibration I was getting at about 35 MPH. Also had the driveshaft balanced. Noticeable improvement there too.
With your problem though, you stated that it was related to RPM not MPH. I'd be curious to see if you rev it in park/neutral if you feel it. If not, you may have a driveshaft or U joint issue if you do feel it, then it's something in then engine or tranny.
TooTall
 
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