Power Variations
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More Turbo
Joined: Apr 2007
Posts: 656
Likes: 5
From: Salisbury, PA
Power Variations
I dont know what to really call it in the title. Does anyone else seem to notice that some times you start your truck up it runs so so and then other times it seems like it runs soo much better and with extra power?? I have my 6.9L timed right where it has the powerstroke rattle on high idle but smooth after it kicks off. It just seems that sometimes I start it and run it seems mediocre and them sometimes it seems to run noticeably better. Anyone else experience this? I just wonder cause it happens time and time again and just did it again last night that I drove 30ish miles to a place and then on the way home it just seems to haul A$$ compared to what it normally does but nothing seems to be out of the ordinary.
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More Turbo
Joined: Apr 2007
Posts: 656
Likes: 5
From: Salisbury, PA
Its even just one drive to another during the day. Engine warmed up...20 mile or so trip. Most of the time it seems to run so so but then there are times when you fire it up it just seems to have some extra pep the whole drive.
Senior User
Joined: Nov 2008
Posts: 104
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From: Sorrento BC, Canada
Ya my truck does the same thing, but my pump is worn out so the advance piston don't work properly. Your trucks pump might be tired. My truck also one day its rattly, and the next its quiet. It sounds like I change the timing on my pump daily but I don't.
Post Fiend
Joined: Oct 2007
Posts: 10,501
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From: Faibanks Ak.
Why don't you guys try warming it up, then pulling the filter and fill it with a good additive cleaner, such as howes, diesel kleen, or seafoam, now crank it and let it run between 10 and 20 seconds and kill it and let it sit overnight with the cleaner in the IP, you might be suprised with the results.
Senior User
Joined: Nov 2008
Posts: 104
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From: Sorrento BC, Canada
Ive been running about 1 liter of atf for 50 litres of diesel every tank. It helps alot for smoothness but it still runs weird. My fuel mileage is also 14.5 and I don't run it hard, but I live in a very hilly area.
New User
Joined: Mar 2009
Posts: 24
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my truck does the same thing and i have a new pump from pensicola diesel and newer injectors. when it is lacking power the motor is rattly almost sounds like lifter noise and then when she shuts up the power is back. it is starting to **** me off and making me want to give up on these idi's. i just don't understand the come and go of this problem.
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Post Fiend
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From: Faibanks Ak.
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Senior User
Joined: Aug 2009
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From: Phoenix
I was having similar issues...sometimes she would run like a top, and then on the next start I would get more rattle, lower power, little more smoke, etc. Russ pointed me in the direction of the timing advance piston. he mentioned it could be overboared. I have not one this yet, put have noticed that when she is acting up I can go jiggle the linkage an get it to run well again.
what caught my interest is in all the reasearch I had done on pump rebuilds I have heard of replacing the avance solenio, but never rebuiling the cylinder/piston until then.
I say jiggle the linkage an see what happens
what caught my interest is in all the reasearch I had done on pump rebuilds I have heard of replacing the avance solenio, but never rebuiling the cylinder/piston until then.
I say jiggle the linkage an see what happens
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
The timing lever is the lever on the side of the IP that runs from the throttle shaft down to the advance plunger on the bottom of the IP.
Rust, corrosion and wear can all make the lever or plunger get stuck.
Also dirt/crud inside the IP fuel passages can stop up or block the passages causing internal IP pressures to change, which in turn changes the timing.
Filling the filter with Diesel Kleen or some other fuel system cleaner then starting the engine for 15 or 20 seconds so the cleaner makes it inside the IP then killing the engine to let it soak overnight may disolve and fix your probem if it is dirt/crud related.
You would be amazed at how many IP's have been fixed using nothing more than a strong dose of fuel system cleaner.
I would burn 10 dollars on a chance to save 500 any day of the week if it had a 10% chance of working.
I give the Diesel Kleen a 45% chance of working.
Rust, corrosion and wear can all make the lever or plunger get stuck.
Also dirt/crud inside the IP fuel passages can stop up or block the passages causing internal IP pressures to change, which in turn changes the timing.
Filling the filter with Diesel Kleen or some other fuel system cleaner then starting the engine for 15 or 20 seconds so the cleaner makes it inside the IP then killing the engine to let it soak overnight may disolve and fix your probem if it is dirt/crud related.
You would be amazed at how many IP's have been fixed using nothing more than a strong dose of fuel system cleaner.
I would burn 10 dollars on a chance to save 500 any day of the week if it had a 10% chance of working.
I give the Diesel Kleen a 45% chance of working.
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