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Allegro Bus with a cummins 8.3...time the stop engine light comes on

Customer Question
I have a Allegro Bus...
I have a Allegro Bus with a cummins 8.3. From time to time the stop engine light comes on. It is very quick and goes right out. What triggers this light?
Submitted: 9 years ago.Category: Heavy Equipment
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Answered in 2 hours by:
9/28/2008
Technician: Rudolph Diesel, ASE ,Master Heavy Truck Technichian replied 9 years ago
Rudolph Diesel
Rudolph Diesel, ASE ,Master Heavy Truck Technichian
Category: Heavy Equipment
Satisfied Customers: 1,942
Experience: 25 YEARS OF HEAVY EQUIPMENT REPAIRS
Verified

Hello

Welcome to JA!

Here is what will trigger the light.

low coolant

low oil

high coolant temp

high oil temp

low oil presser

id go threw check the fluid levels

if there is good oil presser and fluids are full

then

 

 

Most of the time its a faulty low coolant level switch

i would go threw and unplug then plug in the sensors and switches

 

Let me know if i can help more!

Hart

Rudolph Diesel
Rudolph Diesel, ASE ,Master Heavy Truck Technichian
Category: Heavy Equipment
Satisfied Customers: 1,942
Experience: 25 YEARS OF HEAVY EQUIPMENT REPAIRS
Verified
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Customer reply replied 9 years ago
The answer I recived is not right and I need to ask again and add some more info.
Technician: Rudolph Diesel, ASE ,Master Heavy Truck Technichian replied 9 years ago

Ok

How can i help you.

Hart

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Customer reply replied 9 years ago
Ok I made sure all fluids were full, and bypassed the coolant level switch. The alarm continues to go off. I obsereved this weeked that it sounds when excelerating whe climbing a hill or hard excelleration from a dead stop. The alarm goes of when letting off of the throttle. I wonder about fuel pressure problem?
Technician: Rudolph Diesel, ASE ,Master Heavy Truck Technichian replied 9 years ago
Give me 10 minn ill see if the fuel system will trigger the buzzer
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Technician: Rudolph Diesel, ASE ,Master Heavy Truck Technichian replied 9 years ago

Hi there is nothing on the fuel system to tiger a warning buzzer

is there a sensor on the oil pan?

 

Hart

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Customer reply replied 9 years ago
I do not know, but the Stop Engine alarm reacts to the throttle and a sensor on the oil pan would not react that quickly. I wonder about air flow to the intake, maybe dirty air filter?
Technician: Rudolph Diesel, ASE ,Master Heavy Truck Technichian replied 9 years ago

The only thing other then my original posting on the trigger of the alarm would be the TPS throttle possion sensor, But there showing a hard code with the buzzer and light,

Could very well be a intermittent problom so it wont hold a code.

Hart

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Customer reply replied 9 years ago
Yes the light and buzzer come on.
Technician: Rudolph Diesel, ASE ,Master Heavy Truck Technichian replied 9 years ago

My wording was wrong on that sorry

yes on the buzzer and light but a check engine light would stay on even with the buzzer off, ,,,,,,,,,,,,,, but if its a intermittently problom like the brass contact on the TPS then i don't think it will hold a code, I would check that.

Hart

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Customer reply replied 9 years ago
I dont think it can be an intermittent problem as it always stops when I get off the throttle.
Technician: Rudolph Diesel, ASE ,Master Heavy Truck Technichian replied 9 years ago

If it were a hard code for the tps it would have a check engine light on all the time.

and have a code showing 33-145,

A soft code is when it don't last long enough to store in the ecm example is a bad spot on the brass on the ecm so at a certain time during throttle presser it will flash a check engine light and buzz, when you move the peddle it changes the voltage on the tps so all you get is a quick flash of a code,

Hart

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Customer reply replied 9 years ago
Ok Thank you
Technician: Rudolph Diesel, ASE ,Master Heavy Truck Technichian replied 9 years ago

Let me know if your still having problems!

Hart

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Rudolph Diesel
Rudolph Diesel, ASE ,Master Heavy Truck Technichian
Category: Heavy Equipment
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