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Puzzling Engine Issue

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Puzzling Engine Issue
Mon Mar 05, 2018 10:43 am


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 Model 20
Detroit Diesel 6V-92TA
(Began life as NJ Transit Bus)
Florida Eagle
 
Posts: 16
Joined: Sat Sep 03, 2016 8:32 am


Re: Puzzling Engine Issue
Mon Mar 05, 2018 12:31 pm


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!!!
Bus & Car
 
Posts: 120
Joined: Sun Dec 08, 2013 7:59 am


Re: Puzzling Engine Issue
Mon Mar 05, 2018 3:11 pm


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 Model 20
Detroit Diesel 6V-92TA
(Began life as NJ Transit Bus)
Florida Eagle
 
Posts: 16
Joined: Sat Sep 03, 2016 8:32 am


Re: Puzzling Engine Issue
Wed Mar 07, 2018 8:42 pm


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
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luvrbus
Club Member
Club Member
 
Posts: 2940
Joined: Mon Oct 13, 2008 12:50 pm


Re: Puzzling Engine Issue
Tue Mar 13, 2018 9:19 am


Thanks for reply. How & where would I turn off switch?
Steven
1989 Silver Eagle Model 20
Detroit Diesel 6V-92TA
(Began life as NJ Transit Bus)
Florida Eagle
 
Posts: 16
Joined: Sat Sep 03, 2016 8:32 am


Re: Puzzling Engine Issue
Tue Mar 13, 2018 9:52 am


Master switch...shut engine off and restart

Sent from my SM-G930T using Tapatalk
thomasinnv
 
Posts: 22
Joined: Mon Mar 05, 2012 10:44 am


Re: Puzzling Engine Issue
Tue Mar 13, 2018 12:05 pm


Roger!
Steven
1989 Silver Eagle Model 20
Detroit Diesel 6V-92TA
(Began life as NJ Transit Bus)
Florida Eagle
 
Posts: 16
Joined: Sat Sep 03, 2016 8:32 am



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