Need Major HELP?
Thread Starter
Teching In
Joined: Mar 2008
Posts: 15
Likes: 0
From: Arlington Tx
Need Major HELP? 
ok guys here's the deal i have a 94 corvette and apparently i have a serious problem somewhere or something if you start it, it will run for about 30 seconds and then die and i have checked the computer it is not throwing any codes and it also just dies going down the road and when you are at stop lights
s i have replaced the dist,coil,wires and just about every damn sensor on this thing and iam at a loss, no codes and everything new it acts as if it dies either bc it has air from somewhere or no fuel
HELP iam at a loss
TECH Regular
Joined: Aug 2007
Posts: 418
Likes: 0
From: Cypress, TX
if you start it, it will run for about 30 seconds and then die and i have checked the computer it is not throwing any codes and it also just dies going down the road and when you are at stop lights
i have replaced the dist,coil,wires and just about every damn sensor on this thing and iam at a loss, no codes and everything new it acts as if it dies either bc it has air from somewhere or no fuel
i have replaced the dist,coil,wires and just about every damn sensor on this thing and iam at a loss, no codes and everything new it acts as if it dies either bc it has air from somewhere or no fuel
you've tested any of the related circuitry. I would also include fuel-system
related checks. A Haynes manual will have all the troubleshooting checks.
It's quite possible there is a short in the system - check all the wiring for
continuity.
Does the car die after a very specific amount of time? Or does it die under
a very specific condition? Does it die under idle and throttle?
My brother's exhibited similar behavior and it ended up being dirty battery
terminals connections at the battery, which disallowed proper current.
Thread Starter
Teching In
Joined: Mar 2008
Posts: 15
Likes: 0
From: Arlington Tx
yes components were check everything says ok and i have a service manual from chevy and have trouble shot just about everything but there was a few vacum leaks but i ran new vacum line and still iam at a loss even the fuel system checks out
and it dies under any condition like ac on or off driving or just sitting it the driveway if its running it wouldnt be for like longer then a minute or so but if i can get to the highway and cruise then it will roll just fine, in fact if there are no red lights i make it to I-20 up here and blast toward 360 and it does ok but during traffic or stop lights it is hell
and it dies under any condition like ac on or off driving or just sitting it the driveway if its running it wouldnt be for like longer then a minute or so but if i can get to the highway and cruise then it will roll just fine, in fact if there are no red lights i make it to I-20 up here and blast toward 360 and it does ok but during traffic or stop lights it is hell
TECH Regular
Joined: Aug 2007
Posts: 418
Likes: 0
From: Cypress, TX
yes components were check everything says ok and i have a service manual from chevy and have trouble shot just about everything but there was a few vacum leaks but i ran new vacum line and still iam at a loss even the fuel system checks out
and it dies under any condition like ac on or off driving or just sitting it the driveway if its running it wouldnt be for like longer then a minute or so but if i can get to the highway and cruise then it will roll just fine, in fact if there are no red lights i make it to I-20 up here and blast toward 360 and it does ok but during traffic or stop lights it is hell
and it dies under any condition like ac on or off driving or just sitting it the driveway if its running it wouldnt be for like longer then a minute or so but if i can get to the highway and cruise then it will roll just fine, in fact if there are no red lights i make it to I-20 up here and blast toward 360 and it does ok but during traffic or stop lights it is hell
it is fuel related, but you've checked that. But it does sound fuel-related.
What about the O2 sensors? Have you checked those? It's possible the PCM
is getting some invalid O2 feedback and is changing the fuel mixture in the
rwong direction.
One of the best investments I've made is TunerCat, interface cable, and
various logging software. Obviously, this stuff is for the DIYer, but it does
allow someone to capture data over a period of time, in the search for
some anomaly such as this.
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had very similar problem and ended up being an oxygen sensor one time ....and a bad splice on my maf extension wiring another time. yeah and tunercat and freescan is a huge help and under 140 bucks. what about oil pressure? if it gets too low the sender can cut the pump off if its low enough. just a couple of things to check...it would probally help alot if you could find out if its doing this when switching to closed loop mode.
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