bkay

My engine has started surging very so slightly. Not enough to really affect the tach, but I can hear it. I thought my ears where playing tricks on me but have listened several times over the last 3-4 days. With 99,500 miles I hope it isn't the injector pump. I was thinking maybe the Crank position sensor. Fuel pressures are good. Can't sense a change in power. Anyone have any ideas?

Dodgezilla

I was having a slight surging in my truck up until last weekend when it suddenly stopped! The problem is that it stopped when I put my new lift pump in!! $165.00 and all is well and I have a little extra power now too.... What are your pressures? When is the last time you replaced your fuel filter?
Good luck..

bkay

15 at idle, 12 at cruise, 9 wot. 4.549 miles since last filter change.

Kimrey

Mine has been surging for awhile now. You can feel it at a certain strain of the motor. Not to the floor but just enough to climb a slight grade or something. It's even worse when your towing. It will go away when your floor it. It's just at a certain strain on the motor and you ever so lightly press the pedal. There are all kinds of cures, but it just depends on whats wrong. In other words I haven't figured mine out yet. I have kinda learned to live with it. :'(<br><br>Kimrey

Haulin_in_Dixie

My truck is greatly affected by temperature. On the 40's days it has less power, less economy, and sounds a little less than great. Let it warm up to high 60's and it all changes. Same fuel, etc. Cold I get that idle miss and warm out I do not. Probably have a bad sensor somewhere, but I am too busy to fool with it right now.

wildolman

Might be able to help out after tommorrow,mine does about the same. Coming home last trip,my mpg dropprd to 14.5. Showing codes 0216 and 1693. Fuel pressure fine.<br>Going into Schied Diesel at Lafayette tommorrow.will let you know what I find out.Good luck

bkay

Just to clarify mine is when the truck is at an idel. Also I can detect it in the tach(I said I couldn't in my first post). It also comes and goes. Most of the day yesterday it ran smooth, then during the afternoon it started again. According to the tach there is about a 75 to 100 rpm change when it is surging. ??? There is no surging when driving or pulling.

BigBlue

From day one, my truck has always had a bouncy idle. Just the crankshaft sensor reading the rpms. Bouncy idle as in the tach doesn't sit still, it bounces about 50-75 ro so rpms.

rich

mine had that problem till i cleaned my throttle position sensor then it seemed like it quit after that or i just haven't noticed it

farmerd

My truck was surging at idle as well, i checked fuel pressure i had 10 at idle, 6 cruising, 4 WOT......a fuel filter and fuel pump cured my problem.... I talked to one of the mechanics for Cummins and he said that i was to make sure my throttle linkage wasn't haning up, as this would cause it to surge at idle if it didn't return all the way. There is a recall on throttle linkage on some models.

bkay

This has gotten worse over the weekend. while running down the highway plenty of power everything runs good. Stopped for a light and the engine starts surging about a 200 rpm change. I ideled the truck up and it goes away, let of the accelerator it comes back. It will not do it under a load, ideling in 2nd gear. Fuel pressure are still good. Could it be my Crank Position Sensor?