Why is my bus engine surging?

Scott & Heather · March 12, 2017, 11:44:08 AM

8v92TA DDEC II surges like this when I let off the throttle driving slowly through the city. Is this a setting somewhere in the DDEC computer that we can adjust? See video below:

https://goo.gl/photos/sz7qDFNj864VhtcF7

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Geoff · March 12, 2017, 02:14:17 PM

When it does this are your Jakes on?

--Geoff

ol713 · March 12, 2017, 02:40:17 PM

Hi;
Also check your air cleaners. How long has this been going on?
Merle

eagle19952 · March 12, 2017, 07:11:50 PM

cold oil

Scott & Heather · March 12, 2017, 08:51:24 PM

Geoff: no jakes

Merle: coach has been doing this since Ken and I adjusted the ECM fuel tables.
Don: it does it when completely warmed up. Driving down the road and lifting the throttle while coasting to a stop it does this.

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Iceni John · March 12, 2017, 10:04:06 PM

Is it throwing any codes?

John

eagle19952 · March 12, 2017, 10:04:48 PM

Quote from: Scott & Heather on March 12, 2017, 08:51:24 PM
Geoff: no jakes
Merle: coach has been doing this since Ken and I adjusted the ECM fuel tables.
Don: it does it when completely warmed up. Driving down the road and lifting the throttle while coasting to a stop it does this.

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coach has been doing this since Ken and I adjusted the ECM fuel tables.....
then my guess is you needs to tighten some part of this parameter...tho it sounds to me like it is not an "all cylinders/all injectors problem".. if it is rythmic..then it is the same miss/stumble as in the same cylinder/s...

Scott & Heather · March 13, 2017, 05:14:28 AM

John, that's the rub. I won't know until I get it on a prolink. Idiot lights are wonky. I've been fixing dash electrical stuff little by little.

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uncle ned · March 13, 2017, 07:53:43 AM

Scott I bet Ken will be getting in touch with you soon.

uncle ned

B_K · March 13, 2017, 08:00:50 AM

I can't view the video (problem w/my laptop) but I'm sure it probably has something to do with the settings you guys did on the DDEC.

I'm also with Ned, if Ken knows there is a problem he will go to great lengths to learn about it so he can correct it.
I have always been impressed with Ken's work and totally confused by his computer knowledge.

BK

luvrbus · March 13, 2017, 08:05:48 AM

It could be the turbo sensor trying to figure out what is going on with new setting, Arnold will figure it out the DDEC 11 is a strange animal