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Van keeps losing all power randomly?
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#729785 - November 14th 2017 10:36 am Van keeps losing all power randomly?  
Joined: Sep 2017
Posts: 45
nomadgames Online content
newbie
nomadgames  Online Content
newbie

Joined: Sep 2017
Posts: 45
Denver, CO
Anyone got any ideas? 78 g20 with stock 350. Runs great except that randomly, one of two things will happen. I'll come out to it and it won't start. Starter motor sounds fine. Has a new alternator and battery and belts. It just won't start. Then I'll come out to it 15 mins or an hour later and it'll start right up.

Then the really irritating one: when driving at low speeds, particularly when making tight low speed turns like a u turn, it will just cut off. Loss of power to the engine but not to the lights etc. Again, if I wait and keep trying to start it, it will start again just like normal. Sometimes 5 mins later, sometimes 20, sometimes 2 hours later.

The only thing I can figure is a loose wire somewhere. At some point someone put a security system in it which is not currently hooked up. Any ideas?

Last edited by nomadgames; November 14th 2017 10:37 am.
#729787 - November 14th 2017 11:11 am Re: Van keeps losing all power randomly? [Re: nomadgames]  
Joined: Jun 2010
Posts: 12,653
frscke1 Offline
frscke1  Offline


Joined: Jun 2010
Posts: 12,653
Van Diego California
Battery cables & ground straps ...


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
#729790 - November 14th 2017 1:14 pm Re: Van keeps losing all power randomly? [Re: frscke1]  
Joined: Nov 2013
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Wedgy Offline
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Wedgy  Offline
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Joined: Nov 2013
Posts: 759
West Texas
In a points distributor, a bad condenser will cause a no start. I know GM had HEI long before 78. Not sure if there is one in there or not.

Check for spark when it's not starting.
Plus the basics, like frscke1 said.

I know on the later models, there is somd kind of funky failure in the column.
Good Wrenching Nomadgames!


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#729797 - November 14th 2017 3:09 pm Re: Van keeps losing all power randomly? [Re: frscke1]  
Joined: Sep 2017
Posts: 45
nomadgames Online content
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nomadgames  Online Content
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Joined: Sep 2017
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Denver, CO
Originally Posted by frscke1
Battery cables & ground straps ...



I'll check. It doesn't lose power to the lights or dash or starter tho. Just to the engine.

#729801 - November 14th 2017 6:52 pm Re: Van keeps losing all power randomly? [Re: nomadgames]  
Joined: Jun 2010
Posts: 12,653
frscke1 Offline
frscke1  Offline


Joined: Jun 2010
Posts: 12,653
Van Diego California
There is a broken or corroded wire or connection somewhere .... it might look good outside but inside not so much. Start it up go under the hood & move some wires. Check the wiring at the starter.

It may be your fuse box ...

Get a multi meter start pokin around

Last edited by frscke1; November 14th 2017 7:27 pm.

SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
#729802 - November 14th 2017 8:00 pm Re: Van keeps losing all power randomly? [Re: nomadgames]  
Joined: Sep 2017
Posts: 45
nomadgames Online content
newbie
nomadgames  Online Content
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Joined: Sep 2017
Posts: 45
Denver, CO
Will do.

#729803 - November 14th 2017 8:19 pm Re: Van keeps losing all power randomly? [Re: nomadgames]  
Joined: Jun 2010
Posts: 12,653
frscke1 Offline
frscke1  Offline


Joined: Jun 2010
Posts: 12,653
Van Diego California
It could be your ing switch .... is the key on the column or dash ? The column has more chance of error than the dash type.


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
#729804 - November 14th 2017 8:52 pm Re: Van keeps losing all power randomly? [Re: nomadgames]  
Joined: Mar 2016
Posts: 238
Hasan Ben Sobar Offline
enthusiast
Hasan Ben Sobar  Offline
enthusiast

Joined: Mar 2016
Posts: 238
Tucson,Az.
Get a spare coil. When it won't start, check for spark at the plug. if none, wiggle/retighten all wires associated with the coil. If still nothing, swap the coil. THe internal windings can do funny stuff.

Last edited by Hasan Ben Sobar; November 14th 2017 8:53 pm.

Tucson-it's a dry heat...like an oven
#729805 - November 14th 2017 11:07 pm Re: Van keeps losing all power randomly? [Re: nomadgames]  
Joined: Sep 2016
Posts: 20
Vanereal_Disease Offline
stranger
Vanereal_Disease  Offline
stranger

Joined: Sep 2016
Posts: 20
Illinois
Also check for corrosion any where there is a connector.

I’ve chased similar gremlins all over a vehicle only to figure out some moisture got into a group of connectors and corrosion gave it an intermittent problem. Clean the connections and apply dielectric grease.

#729807 - November 15th 2017 12:52 am Re: Van keeps losing all power randomly? [Re: frscke1]  
Joined: Sep 2017
Posts: 45
nomadgames Online content
newbie
nomadgames  Online Content
newbie

Joined: Sep 2017
Posts: 45
Denver, CO
Originally Posted by frscke1
It could be your ing switch .... is the key on the column or dash ? The column has more chance of error than the dash type.


Dash

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