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Old 09-26-2015, 11:11 AM   #1
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sluggish accelerator, power surge

My 2006 Endeavor with 400ISL Cummings engine is very sluggish for about 2 seconds when accelerating from a stop, then there is a power surge which usually results in easing off the throttle.
Any experience or suggestions as to the problem ??

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Old 09-26-2015, 11:22 AM   #2
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Turbo lag?
Our ISC and ISX do the same thing. Almost totally cured the ISC when I put a Banks kit on it.

2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
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Old 09-26-2015, 12:26 PM   #3
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Originally Posted by john1712 View Post
My 2006 Endeavor with 400ISL Cummings engine is very sluggish for about 2 seconds when accelerating from a stop, then there is a power surge which usually results in easing off the throttle.
Any experience or suggestions as to the problem ??

It's been said that diesels don't accelerate as much as they "gather momentum". The more you drive your coach, the more you will embrace that concept. Turbo lag has been minimized in modern engines but it's still there. Remember, you are most accustomed to a vehicle with about 10-20 pounds per horse power and moving to one with maybe 100 pounds per horse power. Never the twain shall meet.

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Old 09-27-2015, 10:03 AM   #4
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Start by changing the primary fuel filter. A lag in fuel delivery will have symptoms like that.

Do you change your fuel filter on a regular basis, maybe year or two, or every 10,000-15,000 miles? It's a good idea that will help avoid fuel delivery problems. Even so, one re-fueling from a dirty diesel source can quickly clog up the primary filter. Or bring a lot of water into it (it is also the water separator).
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Old 09-27-2015, 10:40 AM   #5
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They run them lean when you first step on the pedal, so they don't blow out black smoke, like in the old days.

Once the turbo starts producing some usable boost, to senses that and sends more fuel to the injectors.

We had 2 Cat V12 engines. One mechanical at 800 hp and the newer one 1000 hp with electronic injection.

When we throttled up the mechanical, it looked like an old locomotive taking off.

The electronic, wound up a bit slower, but not a puff of smoke and made more power.

I wouldn't change a fuel filter unless I had a power loss, with a load on, like getting up to speed. Thats when they use the most fuel.
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Old 09-27-2015, 11:25 AM   #6
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If it has always done this then like said above that is more or less normal. If it something new then I would change fuel filters and see if that cures it.

Is it sluggish after you are accelerated and driving down the road, on hills etc? If it is sluggish all the way through and seeming to have loss of power I would say it may be a loss of boost. Check all your hoses and clamps on hoses going from turbo to cac etc.
Other than that you may need a good diesel shop to trouble shoot.

Dennis & Marcie & Hook The Jack Russell, 2001 HR Imperial 38wds 350 Cummins, 07 Chevy Trailblazer/Blue Ox/Ready Brake, 04 Dodge 3500 Cummins,
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