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Puzzling Engine Issue

This is a public forum to discuss Eagle related technical issues. If you are having a problem with your Eagle, this is the place to find help.
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Florida Eagle
Posts: 34
Joined: Sat Sep 03, 2016 8:32 am
FMCA #: F463073
Bus Model: 1989 Silver Eagle/Model 20

Puzzling Engine Issue

Post by Florida Eagle »

Hi guys,

I have a puzzling (to me) problem with my 1989 6v92T that began about 6 weeks ago. It follows the same pattern each time. Engine starts fine and runs great/normal for about 15-20 minutes. Then the engine loses power and seems to “miss” somewhat. Speed decreases to 25-30. Will not go faster no matter what I try. This period lasts for about 10 minutes. Then the engine seems to resolve the problem and bus slowly picks up speed to normal and thereafter runs fine for remainder of trip. Next day, pattern repeats. Thoughts?

Steve
Steven
1989 Silver Eagle, NJT Model 20
Detroit Diesel 6V-92TA
(Converted NJ Transit Bus)
Bus & Car
Posts: 161
Joined: Sun Dec 08, 2013 7:59 am
Bus Model: 2011 Fiat Van, my daily driver.

Re: Puzzling Engine Issue

Post by Bus & Car »

Automatic or manual?

If automatic, DO NOT TRY THIS!!!

If manual, next time this happens and it is safe to do this (at least 50 MPH on an open flat straight road in highest gear plus little traffic), put gearbox in NEUTRAL. Release the clutch and turn engine off but leave ignition on. Let it coast for at least 15 seconds and restart engine. Coast at idle for at least ten more seconds and put her in gear.

If nothing changed, you have most likely an electronic problem somewhere, like in the engine management computer or a sensor sending bad info to the computer. Oil pressure and coolant temperature sensors are good places to start looking but don't forget things like the throttle position sensor and the mass airflow sensor.. Understand this is NOT a cure and does not normally solve the problem that causes this behavior. It's just a way to make your driving easier until you get the problem resolved.

If automatic, is it a DDEC (electronic) engine and gearbox? It may be going into a 'limp mode' for awhile, likely for a bad sensor as above.

In both cases, replacing the bad sensor or computer will likely solve the problem. Worse yet, it may expose other elcetronic problems.


Good Luck!!!
Stay Fine As A Porcupine!!!///Reste Trés Bien Comme Un Porc-Épic!!!
Florida Eagle
Posts: 34
Joined: Sat Sep 03, 2016 8:32 am
FMCA #: F463073
Bus Model: 1989 Silver Eagle/Model 20

Re: Puzzling Engine Issue

Post by Florida Eagle »

Thanks! It is an automatic. A sensor issue of some type is a good place to start. Appreciate your thoughts and time!
Steven
1989 Silver Eagle, NJT Model 20
Detroit Diesel 6V-92TA
(Converted NJ Transit Bus)
User avatar
luvrbus
Club Member
Club Member
Posts: 2981
Joined: Mon Oct 13, 2008 12:50 pm
FMCA #: F262917
Bus Model: 05

Re: Puzzling Engine Issue

Post by luvrbus »

That is a 748 in NJ Transit if you suspect a limp mode just pull over and turn the switch off and it will clear the limp mode but check your fluid
Florida Eagle
Posts: 34
Joined: Sat Sep 03, 2016 8:32 am
FMCA #: F463073
Bus Model: 1989 Silver Eagle/Model 20

Re: Puzzling Engine Issue

Post by Florida Eagle »

Thanks for reply. How & where would I turn off switch?
Steven
1989 Silver Eagle, NJT Model 20
Detroit Diesel 6V-92TA
(Converted NJ Transit Bus)
thomasinnv
Posts: 22
Joined: Mon Mar 05, 2012 10:44 am
Bus Model: 1998 MCI 102-DL3
11.1 Series 60 w/ Allison B500

Re: Puzzling Engine Issue

Post by thomasinnv »

Master switch...shut engine off and restart

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Florida Eagle
Posts: 34
Joined: Sat Sep 03, 2016 8:32 am
FMCA #: F463073
Bus Model: 1989 Silver Eagle/Model 20

Re: Puzzling Engine Issue

Post by Florida Eagle »

Roger!
Steven
1989 Silver Eagle, NJT Model 20
Detroit Diesel 6V-92TA
(Converted NJ Transit Bus)
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