Truck Surges When Crusin Below 1500rpm/ Help??

globaltruck1

globaltruck1

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May 27, 2009
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ok this has progressively gotten worse since I put all my goodies on this truck. If i'm trying to cruise below 1500rpm it will surge like crazy until I floorboard it and roll coals or grab a lower gear. Always noticed in 4th and 5th just cant lug it around anymore. Just looking for some ideas because this is getting annoying to drive everyday and is taking a toll on the driveline!
 
It's called lots of fuel and no air. Your flooding the motor out essentially. Either turn the fuel down or grab a lower gear and keep the rpm's up.
 
BgBlDodge said:
It's called lots of fuel and no air. Your flooding the motor out essentially. Either turn the fuel down or grab a lower gear and keep the rpm's up.
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I don't think he's rolling coal when it's doing this. Sounds like a fuel management issue. What controls constant pedal fueling on your truck? Springs?
 
Well, that kind of baffles me. The truck didn't do it for the first few thousand miles. II told me to send my injectors back and the would reset the pop pressure lower and that would fix the problem. It does it with or without the chip.
 
Charles said:
I don't think he's rolling coal when it's doing this. Sounds like a fuel management issue. What controls constant pedal fueling on your truck? Springs?
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yea not giving hardly any pedal when this happens. just trying to eas around town. The only way to stop it is to mash the throttle
 
What is your boost at those RPM? Mine does not like to be lugged anymore, the clutch rattles below 1500 RPM in any gear over 3rd. Just get used to running out the RPM and crusing at 1500+ RPM and you will be fine.
 
I noticed this also after installing my 150s it hates being lugged (said before but below 1500ish) and gets the buck like someone who cant drive stick (easiest way for me to explain it).
If I down shift it goes right away.
 
Factory lines here. My auto hates being lugged that low. Same symptoms, starts chugging and bucking and the only cure is to either stomp it and get some air built up or lock it out of OD and let the rpm's build. And my truck doesn't puff smoke while its lugging either. Its to much fuel and not enough air.
 
Mine does it as well with 150's stock lines and big tubes. I just keep the rpms up above 1500 and its fine,been this way for 3 years you will learn to drive around it. Doesn't seem to do it nearly as bad since i put the twins on it.
 
yea sounds like you guys are on the same page! I'm thinking injectors as well! I'm gonna try and get the pop pressure changed! Usually theres very little boost down that low in the taller gears! I'm running stock lines .0120 cross tubes!
 
Mine always did it to. I just figure it was the turbos( 66 71 66 74) and the low rpm 1500 -1000 it would buck like hell unless you floored it or got outa it.
 
yea mine has gotton worse like ur saying. I haven't even gotten to bigger turbo or huge injectors yet. It is alot worse with adrenaline, my juice wasn't bad when backed down.
 
All i can say is have fun and welcome to the old world i lived in. Sure hope you didnt end up with the exact same problem. You by chance didnt notice if the electronics under the pump cover had already been tapped????
 
I don't think turbocharging has one thing to do with this. This is a fuel management problem...

The pump is trying to supply enough fuel for ____rpm based on where your foot is at when cruising. And I'm betting your foot is right at the beginning of the pedal travel in these situations.

It sounds like with the increased injection rates the pump is unable to accommodate this low injection quantity needed for unloaded cruising at low rpm after you install injectors with such a higher injection rate.

Isn't this whole show controlled by a centrifugal governor with springs? I can't help but wonder if some portion of that governor couldn't be altered to recalibrate the pump so that it works again with the higher injection rates the bigger nozzles are creating.

I seems like the pump simply can't accurately meter such a low fuel output demand. What for the pump used to be nearly no fuel injected at all, now with larger nozzles results in enough fuel to drive the truck along fine. Meaning you lost resolution down low.

That's just me.
 
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