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  #1  
Old 12-01-2007, 11:05 AM
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Help! Rough Engine

My truck runs horribly rough between 1200 - 1500 rps. The whole truck shakes. I replaced the fuel filter thinking that may be it, (the old one was nasty), but problem still occurs. Any ideas what to check.

Last edited by leatherlung; 12-01-2007 at 11:22 AM. Reason: refresh
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Old 12-01-2007, 12:14 PM
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Had to write something here to keep post alive till I get an answer.
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Old 12-01-2007, 12:53 PM
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Are you getting a ses light on the dash? Do you have a scanner to see if you have any codes?
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Old 12-01-2007, 12:56 PM
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Is it definitly the motor? Or is it a vibration somewhere else at certain rpm's and speeds?

just a thought, give us some more symptoms, and we could help more.

Good Luck
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Old 12-01-2007, 01:01 PM
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I'd look into checking out the U-joints..they can cause some serious vibration as they wear out. Another place to look is your allignment/balance.
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Old 12-01-2007, 01:22 PM
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No its the engine. Always at RPMs mentioned above. I have a diablo tuner. Have it tuned at +100hp. I haven't noticed any lights coming on. I think the tuner has a scanner. I will check that out.
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Old 12-01-2007, 01:23 PM
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It feels like a gas burner when the plugs are misfiring badly.
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Old 12-01-2007, 01:24 PM
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Yeah read your codes write them down and then clear them and then drive it again and check them again tomorrow and see if the same or any come up. If no codes are present it could be a fuel pressure issue. Its only at those rpm's?
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Old 12-01-2007, 01:38 PM
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yes, only at those rpms. Can you leave that fuel pressure guage installed permanantly? I saw it on the BB fuel boost mod.
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Old 12-01-2007, 02:20 PM
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did you find any codes???
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