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Open Roads Forum  >  Tow Vehicles

 > Cummins engine barely starts

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mexicanpiloto13

Phoenix

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Posted: 09/07/21 04:13pm Link  |  Quote  |  Print  |  Notify Moderator

Years ago we had an issue with a fuel cut off solonoid for our Cummins engine model 6C 8.3. It would it be difficult to start and I replaced the solonoid and it would start right away. now when we got to Fort Worth the engine would not start and barely kick over. Cranking very slow.. after 2 hours we got it to start and I'm wondering if it's just a bad engine battery. I did couple the coach batteries together with the engine battery and it's still kicked over very slow . We have a mobile mechanic coming tomorrow and I'm wondering if it sounds just like a bad engine battery. Voltage reads 12.8 in the coach but that could be a a surface charge. Any thoughts? It's been hard to start for a while, never kicking over fast. I hope it's not a sticky cutoff solonoid because there are none left in the US!

Ranger Smith

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Posted: 09/07/21 04:43pm Link  |  Quote  |  Print  |  Notify Moderator

Could be the batteries, starter or bad ground. Batteries need to be load tested. Did you ever change the engine batteries?? How old are they?? Clean the grounds from the engine battery


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wolfe10

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Posted: 09/07/21 05:25pm Link  |  Quote  |  Print  |  Notify Moderator

Before spending $$$ on someone else, check both positive and ground connections between chassis battery and engine.

Also, while someone else is cranking the engine, monitor chassis battery voltage at the battery and then at the starter with your DIGITAL VOLTMETER.


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wing_zealot

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Posted: 09/07/21 05:38pm Link  |  Quote  |  Print  |  Notify Moderator

How old is the starter?

Grit dog

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Posted: 09/07/21 05:54pm Link  |  Quote  |  Print  |  Notify Moderator

No fuel vs cranking too slow are most likely totally different issues.


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Grit dog

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Posted: 09/07/21 06:22pm Link  |  Quote  |  Print  |  Notify Moderator

To better describe, differentiate “kicking over slow” from “cranking slow.”
One says low voltage, or bad batteries or bad cables or possibly starter motor on its way out.
The other says it takes a long time to get fuel.

mexicanpiloto13

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Posted: 09/07/21 09:24pm Link  |  Quote  |  Print  |  Notify Moderator

Original equipment. 1998. 126,000 miles. You have been very helpful.

jdc1

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Posted: 09/08/21 08:16am Link  |  Quote  |  Print  |  Notify Moderator

Phoenix? Batteries don't last long in 120* temperatures.

Grit dog

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Posted: 09/08/21 09:46am Link  |  Quote  |  Print  |  Notify Moderator

OP has stopped providing diagnostic breadcrumbs, so time to move on apparently.
Sounds like it’s a P pump ISC, so about as simple as they get and bulletproof engine (in a RV anyways) with as low of miles/hours on it.
Fuel, air and good power to the starter is all she needs.

mexicanpiloto13

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Posted: 09/08/21 10:24am Link  |  Quote  |  Print  |  Notify Moderator

Thanks to all for your help.A diesel mechanic came to the unit this morning said the batteries are sufficient although old. He recommends cleaning the terminals he thinks the starter solonoid is going out because there's a slight hesitation when engaging the starter. I have a call into Cummins to see if they have a solenoid or starter so I can have the whole package put on there I appreciate everybody's help.

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