Mack truck stops

showcrop · Oct 12, 2016

The 2005 Mack Granite with 280,000 miles that I drive occasionally, stopped for a split second one day last week. I was driving down the road when it just stopped running for maybe 2/3 of a second. Being in gear and moving, it restarted itself. The lightning bolt icon came on but went out after a few minutes. Now, upon first start in the morning, the same icon comes on along with another, as well as the whistle, they stay on well after air pressure has come up, and they won't go out until you have moved the truck some fifteen feet. I can see that this is eventually going to put me beside the road. A friend who has sold heavy trucks for many years says that it is a sensor or sensor connection. Any ideas?

wjytexas · Oct 12, 2016

does that engine have a cam sensor?

Hendrik · Oct 12, 2016

... or possibly a crank sensor (for the rotational position of the crankshaft)?
I've had my engine cutting out at some highly inconvenient instances :-(. Sometimes a couple of times a day and then many days without any hint of trouble. Very annoying and no codes thrown. Crankshaft sensor was replaced and not a lick of trouble since.

John M · Oct 12, 2016

Does that one have that sensor on the flywheel? We dont have any Granites here at work, but we do have Macks, and one died
recently and the flywheel had to be replaced, or it was faster to do so, so they did that. I just remember the mechanic being
upset that he forgot to time it and had to take the flywheel back off.

Buddy · Oct 12, 2016

Try plugging it into a scanner, and see if it has set a code.

JD Seller · Oct 12, 2016

Check all the battery connections. Some of the newer trucks have a separate small harness for the ECM. I have had this corrode and cause the type of trouble your having.

Al Baker(pumpman) · Oct 12, 2016

I have seen hick ups when damp or raining. Was it foggy or raining?

Gchase24 · Oct 12, 2016

Good friend of mine has 11 Mack dumps . I drive them on occasion to help when a driver is out sick or can't or won't show up for
work.Several times I had the same situation occur.Most of the time it was a low water sensor or an actual low water level. One
truck had leaking liners that was just begining and was very slow water loss.Mack found the problem by pressure checking the
cooling system.

showcrop · Oct 12, 2016

(quoted from post at 11:36:23 10/12/16) I have seen hick ups when damp or raining. Was it foggy or raining?

It was dry at the time, so it looks like I need to check the connection for the low water sensor first and if it looks good ask them to get a new sensor. Thanks, guys.

showcrop · Oct 12, 2016

(quoted from post at 11:36:23 10/12/16) I have seen hick ups when damp or raining. Was it foggy or raining?

It was dry at the time, so it looks like I need to check the connection for the low water sensor first and if it looks good ask them to get a new sensor. Thanks, guys.

ohiodick · Oct 12, 2016

when mil. is on check blink code. turn cruise switch off press set resume switch light goes out release switch count blinks will be a two digit number.

showcrop · Oct 12, 2016

(quoted from post at 18:34:42 10/12/16) when mil. is on check blink code. turn cruise switch off press set resume switch light goes out release switch count blinks will be a two digit number.

What is mil. ? Is it the shut engine down light?

ohiodick · Oct 12, 2016

the lightning bolt.

4play · Oct 12, 2016

What is mil. ? Is it the shut engine down light?

MIL = Malfunction Indicator Lamp

showcrop · Oct 13, 2016

(quoted from post at 19:25:46 10/12/16) the lightning bolt.

Is the lightning bolt lamp same as MIL?

MARK ROBKE · Oct 13, 2016

The correct way to diagnose this is with a diagnostic computer.You need to read the code(s),and follow the fault tree.If the MIL(lightning bolt) light came on it should have a fault code.It CAN be a low coolant problem,or the sensor.Some engines can be programed to shut down,derate,or just turn on the MIL light for a low coolant fault.Low coolant is the first,most likely scenario,BUT,it can be a lot of other things,too!For example this could be losing ignition power for a moment.This would not log a fault,but,it would change the key on/off count,which the computer keeps.Or another thing,loss of battery power which does make a fault code.Or an oil pressure fault-the list goes on.
Check the basics-coolant level,oil pressure,electrical connections,but don't throw parts at it without diagnostics.Mark

showcrop · Oct 13, 2016

(quoted from post at 07:45:58 10/13/16) The correct way to diagnose this is with a diagnostic computer.You need to read the code(s),and follow the fault tree.If the MIL(lightning bolt) light came on it should have a fault code.It CAN be a low coolant problem,or the sensor.Some engines can be programed to shut down,derate,or just turn on the MIL light for a low coolant fault.Low coolant is the first,most likely scenario,BUT,it can be a lot of other things,too!For example this could be losing ignition power for a moment.This would not log a fault,but,it would change the key on/off count,which the computer keeps.Or another thing,loss of battery power which does make a fault code.Or an oil pressure fault-the list goes on.
Check the basics-coolant level,oil pressure,electrical connections,but don't throw parts at it without diagnostics.Mark

On my way home from my regular job today I texted the owner of the truck and told him to check the coolant. I am starting with the easy things. Thanks.

Mack truck stops

showcrop

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wjytexas

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Hendrik

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John M

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Buddy

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JD Seller

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Al Baker(pumpman)

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Gchase24

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showcrop

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showcrop

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ohiodick

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showcrop

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ohiodick

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4play

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showcrop

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MARK ROBKE

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showcrop

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