Ford diesel Rough idle

GMC guy

Hero Member
Joined
Feb 16, 2008
Messages
360
Points
16
Make
Ford
Model
Superduty F450
Year
1999
Miles
248,000 km
Engine
7.3 Diesel
1999 ford F 450 superduty. 7.3 powerstroke diesel auto. 248k turbo. Engine runs rough. Does not have much power. I dont drive too many diesels so im not sure how to tune this truck up. Need a bit of help. Thank you in advance
 

Mobile Dan

wrench
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Mar 1, 2002
Messages
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Location
Kentucky
All my years in auto repair and I never asked myself this question..."How do you do a compression test on a diesel if there are no spark plugs to remove?" Maybe glow plugs are removed?
 

dabunk

wrench
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120
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Belize, Central America
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On the 7.3 yes you can removed the glow plugs to do compression test. On others with no glow plugs you have to removed injectors and get a special adapter. On this 7.3 I would suggest replacing injectors if they have not been done. On this system oil pressure from the high pressure oil pump opens the injectors. Over time especially if oil changes are not regular the do not operate properly. There are tests for this One is with computer you fire injectors one at a time and you should hear a distinctive click on each one. Little or no noise heard replace injectors
 

GMC guy

Hero Member
Joined
Feb 16, 2008
Messages
360
Points
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Okay i will test the injectors when i have time. Thank you!
 
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