Engine stalling and not responding to throttle
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Teching In
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Engine stalling and not responding to throttle So the other day i was out for a drive in the ol 99 Z28 when the car all of a sudden started to sputter like it was out of gas while i was going about 50 mph. the car slowed a bit and i down shifted and gave it gas but it wasn't responding. so i pulled off to the side of the road and had a buddy come trailer it to his shop. when we got there i tried to start it again and it died almost instantly. after about the fourth attempt to start it it turned over.it kicked up like normal but sputtered and was almost completely unresponsive to the throttle. i changed the fuel filter but that was no help at all. when i turn the ignition to on i can hear the fuel pump kick on and ive checked the schrader valve and there is pressure, but i am unsure as to how much pressure is supposed to be while the engine is off. i did manage to get the engine to stay on while intermittently giving it some throttle, but it revs up to about 3 grand maximum. it also will not hold a consistent rpm at any given amount of throttle i give it. Any suggestions as to what may be wrong? ive also tried swapping the MAF sensor and TPS sensor without much change in its condition.
EDIT: also, the check engine light isnt on, so i dont believe it is throwing any codes
EDIT: also, the check engine light isnt on, so i dont believe it is throwing any codes
Last edited by Playr; Feb 17, 2010 at 10:28 PM. Reason: additional info
Thread Starter
Teching In
Joined: Apr 2009
Posts: 15
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Car has 120k on it and as far as I know the fuel pump has never been changed. Haven't had a chance to check the fuel pressure yet but will soon
So the other day i was out for a drive in the ol 99 Z28 when the car all of a sudden started to sputter like it was out of gas while i was going about 50 mph. the car slowed a bit and i down shifted and gave it gas but it wasn't responding. so i pulled off to the side of the road and had a buddy come trailer it to his shop. when we got there i tried to start it again and it died almost instantly. after about the fourth attempt to start it it turned over.it kicked up like normal but sputtered and was almost completely unresponsive to the throttle. i changed the fuel filter but that was no help at all. when i turn the ignition to on i can hear the fuel pump kick on and ive checked the schrader valve and there is pressure, but i am unsure as to how much pressure is supposed to be while the engine is off. i did manage to get the engine to stay on while intermittently giving it some throttle, but it revs up to about 3 grand maximum. it also will not hold a consistent rpm at any given amount of throttle i give it. Any suggestions as to what may be wrong? ive also tried swapping the MAF sensor and TPS sensor without much change in its condition.
EDIT: also, the check engine light isnt on, so i dont believe it is throwing any codes
EDIT: also, the check engine light isnt on, so i dont believe it is throwing any codes
You need to get a scan with a real OBDII scanner so you can actually see things operating while the engine is running. Like 02 sensors switching properly.
Could be a bunch of things, like a failing 02 sensor(s) or a failing Crankshaft position sensor.
But I'd definitely start with checking that fuel pressure at the rail.
.
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Teching In
Joined: Feb 2010
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From: Rochester NY
hey it could be your 02 sensors. my 02 sensor got loos when i took my formula to the car wash and i got the under spray my 02 sensors got wet and gave it a slow respons and it would do run really bad and shut off like that. and LS6427 is right bc i used one of them dumb scaners it was junk i towed my car to my tuner and he hooked up his lap top to it and got a better idea bc even the 02 sensor was bad the maf didnt run ither so i would check out the sensors and your fuses too.
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