1993 Chevy 1500 4x4 5.7, abruptly quit running going down the road. no hesitation or cough, just died like you flipped a switch. popped the hood and found that the vacuum line that runs from the vacuum pod to the throttle body was off the nipple on the bottom of the throttle body. and broke in half midway down the hard plastic part of the hose or tube. rigged it with a straw from a fast food cup but wont start. guess we should have taped the straw at both ends???
Cars & Trucks - Chevrolet - 1500 - 1993 Chevrolet K1500
Answers & Comments
A small vacuum line leak would not kill the engine while running, nor prevent it from starting. Unless the "pod" sent the vacuum signal to a critical part, but I cannot think what that would be. At any rate you should fix that with a different hose. Any vacuum line or hose would work good, doesn't have to be the hard plastic like yours, just as long as it fits snugly at both ends and doesn't leak.
Stopping quick like that sounds like the ignition system abruptly quit. Buy a cheap spark tester and check for a blue, snapping spark on a spark plug wire or two. You would not have to use the tester to check, but it prevents the possibility of getting shocked by holding the wire end close to metal, or ground. If spark is not strong and blue, suspect an ignition failure, possibly the ignition control module; or the crank position sensor or pickup coil-whichever one your truck has.
If spark is good, check fuel pressure for a possible fuel pump failure.
Good luck. Post back with what you find.
It was the ignition coil under the distributor cap. Thanks for all the help
Glad you found it. Good news!
Are you talking about the MAP sensor ? Small black box with a wiring plug and a vac hose ? If you are, the hose has to be open to allow the sensor to measure engine vac. It should start with the sensor unplugged tho.
Do you have spark to the plugs and fuel pressure ?