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  #1  
Old 10-01-2007, 12:56 PM
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Engine Trouble 7.3 L

Engine runs rough like it is missing. Only can get up to 50 mph at 2200 rpms. No warning lights have come on. Could this mean fuel pump is going out? Possibly a turbo issue not providing enough boost?
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Old 10-01-2007, 01:17 PM
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Welcome to the ORG.!

Try checking the fuel pressure and make sure the filter is good.
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Old 10-01-2007, 02:12 PM
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ditto on the fuel pressure test , also make sure the oil is full
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Old 10-01-2007, 02:16 PM
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ditto on the fuel !! Do tis steep by steep check oil level , intake filter, fuel filter if none of these do ne thing get the injectors tested Buzz N contrubition test done , Ill bet you have lost an injector Just a feling............ Bill ...........good luck
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Old 10-01-2007, 02:30 PM
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My 99 is doing a similar thing. It runs rough. Like a dropped cylinder. But then if I shut it off and restart all is well. It doesn't do it all the time, now if I am on the highway there is no problem at all it is just when I am driving around town or at slow speeds. Any Ideas?
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Old 10-02-2007, 02:21 AM
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Quote:
Originally Posted by shoit2ya View Post
My 99 is doing a similar thing. It runs rough. Like a dropped cylinder. But then if I shut it off and restart all is well. It doesn't do it all the time, now if I am on the highway there is no problem at all it is just when I am driving around town or at slow speeds. Any Ideas?
Check for a loose connector at the Valve coners. If good there, try a buzz test.
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Old 10-03-2007, 10:32 AM
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Engine Trouble

What is a buzz test? Currently changing fuel filter and doing an oil and filter change. Noticed some a bit of oil in valley. Heard from others this could be a leak at the HPOP or turbo pedistal. Is this correct?

Last edited by JerryDKline; 10-03-2007 at 10:40 AM.
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Old 10-03-2007, 10:37 AM
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A buzz test needs to be done by the dealer or a repitubal diesel shop , U need soft ware an a laptop and a connection to the OBD2 (My single injector malfunction did NOT show up in any codes), .... and after that the soft ware will also do a contrubution test an will tell you the health of each induvudial cylender... Bill
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Old 10-05-2007, 10:08 AM
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Engine Trouble 7.3L

Thanks for letting me know and the heads up on what they can do during the buzz test? The truck goes into the Dealer next week to get some leaks fixed on the axle. I will have them do a buzz test for me. New fuel filter is in. The old one was a little dirty and buildup in some places. Changed the oil and filter. Started the truck and all seems fine again. Will have to wait till this weekend to drive and tell if this has made a difference.

Last edited by JerryDKline; 10-05-2007 at 10:19 AM.
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Old 10-05-2007, 01:23 PM
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If the truck is not knocking real bad and runs fairley smoth, (for a diesel), You have all the injectors working... im of the opinion if it is working good, dont fix it... hopeu cleaned hte fuel filter housing real good they get crud on the bottom a lot Other than that have funnnnnnn and keep it going oh if u have a stick you should get about 19 to 21 gpm with you in it....... It has been my experence wen gpm goes down conciderbuly thre is usualy a problem....... Bill Good luck 2 u
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