[Western1]

My buddy has a 97 1/2 ton chevy with a western unimount plow on it. He developed a problem plowing the other day. When lifting the plow in gear it will kill the truck. But when it is in neutral it won’t. Thoughts of what to go after to fix? He’s done normal things plow related like motor and cables.

 

[Randall Ave]

Is it idling wierd? Remove and clean the mass airflow sensor in the air intake. Otherwise need to do some electrical draw tests.

 

[kimber750]

In drive and idling or while moving in drive? Your idle speed will actually be a bit a lower when in gear. Low rpm and weak alternator could cause the plow to draw enough to kill the truck if voltage is dropping far enough. This is assuming it has a slush box.

 

[Western1]

I’ll have to ask. Thanks!

 

[Western1]

He just got a check engine light today for mass air. It was happening well before this tho.

 

[kimber750]

He just got a check engine light today for mass air. It was happening well before this tho.

Bad MAF can cause it idle below normal also.

 

[Philbilly2]

does it snuff it out like stalling or is it like it shuts the key off?

 

[Western1]

Like stalling.

 

[Randall Ave]

Go to the auto parts store and get some MAF cleaner. There are you tubes on how to clean it. It is not hard to do.

 

[Western1]

Turned out to be a one year old Delphi fuel pump that was at bear minimum fuel pressure when tested. Replaced fuel pump and all seems good. Thanks for all your help and thought!!!