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Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 9675
Experience:  worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
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Mack ch613 one morning will start,then goes dead

Customer Question

Mack ch613 one morning will start,then goes dead 1/2second,even if you hold key to start pos.
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Wayne replied 1 year ago.

Hi I'm Wayne

I will help you with this

are you saying it shuts down and goes dead , no cranking

Customer: replied 1 year ago.
The truck will crank over good,and start running for about 1/2second and stop running,even if you continue to crank on it
Customer: replied 1 year ago.
1994 Mack ch613 E7-350 engine ,computer controlled inj. pump no air coming from return line,just fuel. Ben running good,Thursday morning just would not stay running.
Expert:  Wayne replied 1 year ago.

Thank you for that

I suggest to replace the crankshaft sensor

this is a known issue

Wayne

Customer: replied 1 year ago.
Replaced crankshaft sensor and had Gulf coast truck,Mack dealer come check truck,they could not get codes from check engine light,they recommended that i have the pump rebuilt because of stuck rack ? I removed pump and took to Test calibration they replaced seals checked all ele.,including sensor on pump,installed pump ,same problem cranks great,goes dead immediately .
Expert:  Wayne replied 1 year ago.

Thank you for that

So you have a real issue here

need to heck to see if you are getting fuel at injectors

What you are describing is a Faulty ECM

not putting fuel to injectors , but that should trip a code of some sort

your next step is to have the ECM checked

Wayne

Customer: replied 1 year ago.
I am waiting for Mack to come to me with laptop to try pulling codes off Ecm.next week.
Expert:  Wayne replied 1 year ago.

OK

Thank you

please remember to rate my answer

Wayne