My 1997 chev astrovan has a 4.3 and automatic and air. when driving along perfectly norman it will just suddently shut down and not start again for a few minuts then it will start and run like nothing happened untill the next time it decides to shut down.
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Re: unexplained and shutdown.
Electrical control imbalance
or a ground not grounding properly
these are first things i would look at
the next is the levels of coolant in system and how bad the canister is clogged it has a filter in it
then the mechanical the bearings are getting ready to lock up
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We had this same problem with a 1997 Z71. After putting 3 ignition switches in it in 6 months, We finally figured out that every time we used the 4 wheel Low side of transfer case the ignition would go out immediately. The electric motor that engaged the transfer case was bad & would short out ignition every time we used 4 wheel low. It was VERY expensive to repair. I fixed ignition one last time and got rid of it. Good Luck.
This may be a faulty overload switch for the lights ( automatic resetting thermal switch). Check the system for shorts and correct size bulbs or faulty lighting module . IT appears that the current draw for the lights is exceeding the thermal switch capacity and that is why the lights are going off and then back on after the switch cools down.
Similar problem due to wiring on ASD (automatic shutdown relay) not connected tight to terminals on underside (fuse box under hood). I encountered this problem repeatedly after a mechanic (national chain) kept removing this wire for some reason (eventually causing computer to fry). Also related problem misfiring/backfiring/bogging down under certain driving conditions I traced to the battery sliding into computer wiring harness and disrupting sensor input/output signals. Placed 1" spacer on rear clamp to push battery forward, which cured this problem.
Sat on the hood and pulled the outside hood release lever. The air filter case was causing the air supply hose to the intake to hit on the bottom of the hood. Looking from the side of the fender, you could see that the air filter case and hose was above the fender causing the obstruction. Pulled air filter case away from fender monut 1/2 inch and had hood clearance.
Its right in back of the break pedal its a black box you wont be able to see right away its about 4 inches by 4 inches the top pulls forward and down there you will see the fuses and the extra fuses and a puller tool (white plastic) and a diagram of where the fuses go. Good luck
I HAD THE SAME PROBLEM. I LOOKED IT UP IN THE HAYNES MANUAL IT SAID YOU HAVE TO JACK THE CAR UP LEVEL, AND THERE IS A PLUG ON THE SIDE OF THE TRANSMITION, YOU TAKE IT OUT IF FLUID COMES OUT THEN YOU ARE GOOD.