I have been experienceing an engine miss at low rpm (12-1600) combines with a slight uphill pull.<br><br>I have purged the fuel filter water separator but it still seems to have the stumble.<br><br>Any thoughts?<br><br>(I wont taint the comments with mine).<br><br>Also have a wired buzzing/pulated hissing/ticking sound when off or on the throttle at the same rpm range.

 

[quote author=Hummin' Cummins link=board=20;threadid=15889;start=0#149244 date=1055591078]<br>I have been experienceing an engine miss at low rpm (12-1600) combines with a slight uphill pull.<br><br>Pennsylvania - the Tax Me State - and we're broke!<br>[/quote]<br> <br>Fraid I cant help you, Hummin' Cummins. Mine is a SO CARB Clean Burning California Version. Our Stealin Grubbynor Davis won't allow any missing engines out here. Mine is so smoooth from 750 RPM on up to 3000+ RPM.<br><br>Pennsylvania may be broke but nuthin like CA. CA is more in the hole that the other 49 states combined. Now the Grubbynor announces they're layin off 400 CHiPs to save money. This crook makes the rest of them look like Sunday School Boys.<br><br> :'(<br><br>Hope someone else will take a shot at helpin solve your problem

 

Maybe its a lousy batch of fuel. Nothing to do with water, but possibly lousy fuel. <br><br>Did you fill it up at your local/normal fuel pump? When did you notice the stumble? How many tankfuls has it been doing it?

 

Always buy my fuel at the same station and keep a milage log in the event I do get bad fuel.<br><br>That seems fine.<br><br>Miss is intermitten.<br>Difficult to duplicate (I cant do it).<br>Will have to see what happends over time.<br>figured someone would be able to put a finger on it right away.<br><br>Personally thinking lift pump.

 

[quote author=Hummin' Cummins link=board=20;threadid=15889;start=0#149359 date=1055632872]<br>Always buy my fuel at the same station and keep a milage log in the event I do get bad fuel.<br><br>That seems fine.<br><br>Miss is intermitten.<br>Difficult to duplicate (I cant do it).<br>Will have to see what happends over time.<br>figured someone would be able to put a finger on it right away.<br><br>Personally thinking lift pump.<br>[/quote]<br><br>I would be surprised if it's the lift pump. <br><br>About the only thing that will make a diesel 'miss' is a bad injector or low compression. Doubt if your compression is low, either.

 

Suggestion: Run the tank almost dry and then fill up. See what happens after that.

 

How many miles have you gone on your current fuel filter? It could be full/plugged and restricting fuel flow, due to age or a bad tank.. Just a thought.

 

Plugged fuel filter will cause loss of power, not a miss.

 

Just make sure its not the a/c kicking on and off.

 

With these truck they will indeed misfire if the cp3 starts pulling vacuum for too long. Keep doing it and they will full on stumble and then if you keep it up they will stall. Just an FYI