1996 Chevy Blazer Vortec 4.3L V6 engine. Question = While driving on the highway my blazers engine just shut off. I pull over, wait a minute, then start the engine and continue down the highway again. A minute later the engine shuts off again. This happens 7 or 8 times. Everything is fine for a week then it did it again. Why is the engine shutting off?
No warning lights come on and all the gauges are normal. I got the garage to look at it and they said no codes were coming up. So the blazer starts fine and runs fine just shuts off whenever it feels like without warning.
Answer: This may be a problem of a failing fuel pump in your truck. This is pretty common on this truck. Normally this would cause the truck to sort of stumble before it stalls. If it just instantly shuts off like you are turning the key off, then it may be a problem in the ignition switch in the steering column, or an ignition control module.
It may be hard to find, especially if it starts right back up. You would need to have a fuel pressure gauge on the engine and watch to see if it drops as it stalls, and if it is low when trying to restart- and it won't.
Pressure needs to be at least 55 PSI. You can also try tapping on the ignition switch to see if you can cause it to stall. The lower steering column cover would need to come off to the access the switch.
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