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CTD shaking/vibrating... DV's?


This is a discussion on CTD shaking/vibrating... DV's? within the P Pump forums, part of the Dodge Ram Cummins Diesel Forum category!
And to think I have Raptor lift pump just sitting here ..LOL Austin .. dam kid I am going to ...


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Old 01-26-2012, 05:35 PM   #11 (permalink)
 
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And to think I have Raptor lift pump just sitting here ..LOL

Austin .. dam kid I am going to need your SS number so I can claim you on my taxes as a dependent .


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Old 01-26-2012, 06:23 PM   #12 (permalink)
 
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Originally Posted by ramhunter9 View Post
And to think I have Raptor lift pump just sitting here ..LOL

Austin .. dam kid I am going to need your SS number so I can claim you on my taxes as a dependent .
haha, nice.


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Old 01-26-2012, 06:36 PM   #13 (permalink)
 
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Shit I had to feed the kid the other night .. poor little guy
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Old 01-27-2012, 02:31 AM   #14 (permalink)
 
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Originally Posted by ramhunter9 View Post
Shit I had to feed the kid the other night .. poor little guy
Whatever!!! I went to Casey's! You
Made me drive over there when your wife coulda brought me something! Haha

Anyways, I read that your not even supposed to shift into 5th until 50MPH... I don't know... I guess it's time to invest in a fuel pressure gauge...


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Old 01-27-2012, 02:50 AM   #15 (permalink)
 
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"""""The surging in the engine is caused by the small factory DV's in the 160 pumps, At light loads and low rpm the stock dv's can't give enough fuel to keep the larger injector open through the full cycle. Atleast this is how I have had it explained to me. I replaced mine with .022 and the surging stopped.""""" -Mr.Diesel

Just found this... I think this at least part of my problem, if not all of it. But it is time to get my fuel press. guage. This would explain why it does it in low RPM's AND at light loads. Like I said how if I get more into the pedal it powers through it.


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Old 01-27-2012, 08:17 AM   #16 (permalink)
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Check your fuel pressure... P7100 pumps are known for having weak overflow valves and losing fuel pressure...
True....Depending on the mileage it would be very benefecial to make a change in the OFV.

Also remember stock lift pumps are not efficent pumps for high performance then tend to come up short at high RPM's...
ACtually this is not correct..The factory lift pump will support plenty of power.However,if the fuel system is compromised by air leaks(which is a very common problem) the factory lift pump will struggle to maintain even at low power levels.I have personally seen factory pumps run into the 800hp range.

IMO what you have is a fuel system that is allowing air into it somewhere that is causing a lean condition down low and when the RPM's rise the motor can overcome it.The injectors you installed are not large enough to cause this problem at all.I would start by pulling the rubber boot off the lift pump plunger and unplug the fuel heater wiring.IF you find that either are wet/damp with fuel they are allowing air into the fuel system which will be one problem.

The next place to look is the return line that runs behind the P7100 and off of the OFV.Follow the hard line and you will find a small section of rubber hose that gets hard and cracks and causes air leaks also.

Another place to look in the engine bay is where the factory fuel lines cross the bell housing.Mopar uses a line that is a braided outside/plastic lined center which are notorious for leaks as the plastic gets old.

Next place to look for leaks is by following the fuel lines along the frame rails.As the trucks get older the steel lines fail as they rust and will begin to weep or show wet spots.Also try and look on top of the fuel tank basket as you will also find that the hoses there will fail with age and leak or possibly break off a barb fitting and it will leak.

Until you troiuble shoot the fuel system I would not look elsewhere.DV's can cause what your experiencing BUT usually when the have issues the truck will miss from the bottom to the top and not smooth out.I have also seen what you experiencing due to dirty fuel filter and/or pre-filter screen(pre-filter is located down on the lift pump assembly).

Let me know how you make out and I hope this helps.I spent HOURS redoing the fuel system on my old 12v and have seen many guys miss one little leak and it killed them for power..........Andy

P.S.-Also make sure you have no wet injector lines at their mounting points and the small brass washer hoops on the return lines are not leaking.
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Old 01-27-2012, 10:24 AM   #17 (permalink)
 
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Originally Posted by Uncle Ugly View Post
True....Depending on the mileage it would be very benefecial to make a change in the OFV.



ACtually this is not correct..The factory lift pump will support plenty of power.However,if the fuel system is compromised by air leaks(which is a very common problem) the factory lift pump will struggle to maintain even at low power levels.I have personally seen factory pumps run into the 800hp range.
I have, as well. My stock OE lift pump on the 12V supplies more than enough fuel for my 400+hp.
IMO what you have is a fuel system that is allowing air into it somewhere that is causing a lean condition down low and when the RPM's rise the motor can overcome it.The injectors you installed are not large enough to cause this problem at all.I would start by pulling the rubber boot off the lift pump plunger and unplug the fuel heater wiring.IF you find that either are wet/damp with fuel they are allowing air into the fuel system which will be one problem.

The next place to look is the return line that runs behind the P7100 and off of the OFV.Follow the hard line and you will find a small section of rubber hose that gets hard and cracks and causes air leaks also.

Another place to look in the engine bay is where the factory fuel lines cross the bell housing.Mopar uses a line that is a braided outside/plastic lined center which are notorious for leaks as the plastic gets old.

Next place to look for leaks is by following the fuel lines along the frame rails.As the trucks get older the steel lines fail as they rust and will begin to weep or show wet spots.Also try and look on top of the fuel tank basket as you will also find that the hoses there will fail with age and leak or possibly break off a barb fitting and it will leak.

Until you troiuble shoot the fuel system I would not look elsewhere.DV's can cause what your experiencing BUT usually when the have issues the truck will miss from the bottom to the top and not smooth out.I have also seen what you experiencing due to dirty fuel filter and/or pre-filter screen(pre-filter is located down on the lift pump assembly).

Let me know how you make out and I hope this helps.I spent HOURS redoing the fuel system on my old 12v and have seen many guys miss one little leak and it killed them for power..........Andy

P.S.-Also make sure you have no wet injector lines at their mounting points and the small brass washer hoops on the return lines are not leaking.
I forgot all about that. I had to fix a ton of small leaks on the 12V.. The one most hidden, or hardest for me to find was where the steel hardline on the framerail connects to the braided line over the bell housing. The retainer clip inside the lower-most end of the braided line was rusted to pieces (which is odd, as the rest of the hose was SS) and barely retaining the fuel line connection. It would suck air in there, and cause some crazy bucking.


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