my heart sanked !
Thread Starter
Pro
Joined: May 2006
Posts: 536
Likes: 0
From: Humble Texas
my heart sanked !
Just got my car running 2 days ago.after overheating and warping the heads,car has ran great untill tonight !!!
I pulled into the drive afterwork, was sitting in my car turning off my "change oil Light" and puttin air in the tires the tires so the lowtire light would go out..
I CRANK UP MY CAR TO CHECK IF ALL THE LIGHTS WERE OFF, THEY WERE, WHILE IDLING IT DIED,WOULD NOT START, CHKD FUEL PRESSURE,IT WAS OKAY,DID THE QUICK THING AND SPRAYED STARTER
FLUID INTO IT IT, CRANKED BRIEFLY BUT HAD SEVERE VALVE CLATTER..I IMEDIATELY TURND IT OFF....
WHAT HAPPENED ???? ANY IDEAS. 1996 LT1 150,000 MILES
I pulled into the drive afterwork, was sitting in my car turning off my "change oil Light" and puttin air in the tires the tires so the lowtire light would go out..
I CRANK UP MY CAR TO CHECK IF ALL THE LIGHTS WERE OFF, THEY WERE, WHILE IDLING IT DIED,WOULD NOT START, CHKD FUEL PRESSURE,IT WAS OKAY,DID THE QUICK THING AND SPRAYED STARTER
FLUID INTO IT IT, CRANKED BRIEFLY BUT HAD SEVERE VALVE CLATTER..I IMEDIATELY TURND IT OFF....
WHAT HAPPENED ???? ANY IDEAS. 1996 LT1 150,000 MILES
Last edited by ol school; Nov 4, 2009 at 09:19 AM.
Melting Slicks
Joined: Feb 2002
Posts: 2,699
Likes: 2
From: The Black Hole LA
The car needs three things.... air, fuel, and spark. Unless you are on the moon then you have air, and the fact that it started with an alternate source of fuel tells me that you have fire. So, you are missing the fuel part. I realize that you checked the pressure, but are your injectors pulsing? Noid light would help here. If they are not pulsing I'd start checking wiring and ecm. The ecm sends the signal to pulse after recieving a signal from the CCM. If its not getting the CCM signal most likely the starter enable relay is not working and it will not turn over either, not positive on that, I don't have the electrical diagram here to verify.
EDIT: Also, pull a couple plugs to see if they are fouled out. The starting fluid is much more pure than gas so if they were fouled it might start with the starter fluid, but not gas. Maybe that you are getting spark, but not enough to fully ignite the gas.
Last edited by hz900; Nov 4, 2009 at 03:44 PM.
Racer
Joined: Aug 2009
Posts: 289
Likes: 1
From: Tucson Arizona
Sounds to me like an oil pressure problem. On my '86 you need a minimum of 4 psi to close the switch that provides fuel pump power. Starting the vehicle only operates the fuel pump for 2 seconds until the oil pressure switch closes.
Steve
Steve
Race Director
Joined: Jun 1999
Posts: 14,924
Likes: 9
From: Merritt Ils Fl
Not really. I sang this song for years but its the wrong tune. 4 psi is actually an over ride that will keep the pump running is the normal delivery system fails. ECM does initislly pressureize the system, bout 4 seconds worth.
Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
When one just dies like that, most likely an Electrical issue.
OP states that he over heated the car.......overheated and burned which wires in the process?
Picture a cooked wire housing dropping on something metallic and blowing a fuse in the process
He's from Umble Texas.....no not Humble....they don't use that "H" for some reason....it's just there for window dressing.
But who am I to say anything, I'm from Youston.....No no Houston. Only folks from elsewhere say Houston.
Last edited by jhammons01; Nov 5, 2009 at 12:13 PM.
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Race Director
Joined: Aug 2006
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From: D / FW
Did you use a gauge to check fuel pressure ? Do you hear the fuel pump start when you turn on the key ?
You need a gauge to check pressure as I found out the hard way.
Check codes and fuses if pump isn't working.
Also weak voltage will cause it not to start.
Computer has to have full twelve volts when cranking engine or it will not fire up.
Keep with it and do the common sense things first and keep asking for help.
That's one of the great things about this site.
You need a gauge to check pressure as I found out the hard way.
Check codes and fuses if pump isn't working.
Also weak voltage will cause it not to start.
Computer has to have full twelve volts when cranking engine or it will not fire up.
Keep with it and do the common sense things first and keep asking for help.
That's one of the great things about this site.
Racer
Joined: Aug 2009
Posts: 289
Likes: 1
From: Tucson Arizona
Steve
Initial Crank Action:
If you then rotate the key to the start position (assuming the anti-theft system has not disabled the starter), the engine will rotate.
Once the oil pressure has reached 4 PSI, the oil pressure switch will close allowing the fuel pump to run. (Note that you should have a black oil pressure switch/sender. It is mounted behind the distributor on the driver’s side and if it is not black, it is suspect due to a run of bad units that stayed in the GM parts pipeline for some time).
The distributor will send a string of pulses to the ECM (Engine Control Module) in response to the engine being rotated by the starter. These pulses continue as long as the engine turns (both starting and running) and if they are not present, the engine will not run.
ECM Reaction:
If the ECM sees oil pressure greater than 4 PSI and the reference pulses from the distributor, it will energize the injector drivers which will begin pulsing the injectors on for 4 ms (milliseconds) periods. (In the L98, all injectors on one side of the engine fire at the same time followed by all injectors on the other side firing at the same time. On the LT-1, the injectors are fired individually at the appropriate time).
The ECM will also pull in the fuel pump relay in effect paralleling it electrically with the oil pressure switch. (If the fuel pump relay fails, you can still normally get the car to start and run unless you can’t make at least 4 PSI oil pressure. This is a “limp home mode” feature put in place to allow for a fuel pump relay failure).
Thread Starter
Pro
Joined: May 2006
Posts: 536
Likes: 0
From: Humble Texas
Did you use a gauge to check fuel pressure ? Do you hear the fuel pump start when you turn on the key ?
You need a gauge to check pressure as I found out the hard way.
Check codes and fuses if pump isn't working.
Also weak voltage will cause it not to start.
Computer has to have full twelve volts when cranking engine or it will not fire up.
Keep with it and do the common sense things first and keep asking for help.
That's one of the great things about this site.
You need a gauge to check pressure as I found out the hard way.
Check codes and fuses if pump isn't working.
Also weak voltage will cause it not to start.
Computer has to have full twelve volts when cranking engine or it will not fire up.
Keep with it and do the common sense things first and keep asking for help.
That's one of the great things about this site.
Can fire thru the sparkplug wires be detected using a TEST LIGHT?
Race Director
Joined: Jan 2002
Posts: 12,261
Likes: 85
From: O'Fallon Missouri
Thread Starter
Pro
Joined: May 2006
Posts: 536
Likes: 0
From: Humble Texas
Thread Starter
Pro
Joined: May 2006
Posts: 536
Likes: 0
From: Humble Texas
Its going to do that with starter fluid, usually no worries with that as long as you didn't run it to long.
The car needs three things.... air, fuel, and spark. Unless you are on the moon then you have air, and the fact that it started with an alternate source of fuel tells me that you have fire. So, you are missing the fuel part. I realize that you checked the pressure, but are your injectors pulsing? Noid light would help here. If they are not pulsing I'd start checking wiring and ecm. The ecm sends the signal to pulse after recieving a signal from the CCM. If its not getting the CCM signal most likely the starter enable relay is not working and it will not turn over either, not positive on that, I don't have the electrical diagram here to verify.
EDIT: Also, pull a couple plugs to see if they are fouled out. The starting fluid is much more pure than gas so if they were fouled it might start with the starter fluid, but not gas. Maybe that you are getting spark, but not enough to fully ignite the gas.
The car needs three things.... air, fuel, and spark. Unless you are on the moon then you have air, and the fact that it started with an alternate source of fuel tells me that you have fire. So, you are missing the fuel part. I realize that you checked the pressure, but are your injectors pulsing? Noid light would help here. If they are not pulsing I'd start checking wiring and ecm. The ecm sends the signal to pulse after recieving a signal from the CCM. If its not getting the CCM signal most likely the starter enable relay is not working and it will not turn over either, not positive on that, I don't have the electrical diagram here to verify.
EDIT: Also, pull a couple plugs to see if they are fouled out. The starting fluid is much more pure than gas so if they were fouled it might start with the starter fluid, but not gas. Maybe that you are getting spark, but not enough to fully ignite the gas.
and 3 codes..po 300 , po 400 , p1133, dont know if these have anything to do with killin spark , but thats where im at right now.
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
Yes , It is wrong. The ECM doesn't see oil pressure. The ECM will happily pulse the injectors with or without oil pressure.
Is this L98 information from the Corvette Action Center not applicable to the LT1?
Steve
Initial Crank Action:
If you then rotate the key to the start position (assuming the anti-theft system has not disabled the starter), the engine will rotate.
Once the oil pressure has reached 4 PSI, the oil pressure switch will close allowing the fuel pump to run. (Note that you should have a black oil pressure switch/sender. It is mounted behind the distributor on the driver’s side and if it is not black, it is suspect due to a run of bad units that stayed in the GM parts pipeline for some time).
The distributor will send a string of pulses to the ECM (Engine Control Module) in response to the engine being rotated by the starter. These pulses continue as long as the engine turns (both starting and running) and if they are not present, the engine will not run.
ECM Reaction:
If the ECM sees oil pressure greater than 4 PSI and the reference pulses from the distributor, it will energize the injector drivers which will begin pulsing the injectors on for 4 ms (milliseconds) periods. (In the L98, all injectors on one side of the engine fire at the same time followed by all injectors on the other side firing at the same time. On the LT-1, the injectors are fired individually at the appropriate time).
The ECM will also pull in the fuel pump relay in effect paralleling it electrically with the oil pressure switch. (If the fuel pump relay fails, you can still normally get the car to start and run unless you can’t make at least 4 PSI oil pressure. This is a “limp home mode” feature put in place to allow for a fuel pump relay failure).
Steve
Initial Crank Action:
If you then rotate the key to the start position (assuming the anti-theft system has not disabled the starter), the engine will rotate.
Once the oil pressure has reached 4 PSI, the oil pressure switch will close allowing the fuel pump to run. (Note that you should have a black oil pressure switch/sender. It is mounted behind the distributor on the driver’s side and if it is not black, it is suspect due to a run of bad units that stayed in the GM parts pipeline for some time).
The distributor will send a string of pulses to the ECM (Engine Control Module) in response to the engine being rotated by the starter. These pulses continue as long as the engine turns (both starting and running) and if they are not present, the engine will not run.
ECM Reaction:
If the ECM sees oil pressure greater than 4 PSI and the reference pulses from the distributor, it will energize the injector drivers which will begin pulsing the injectors on for 4 ms (milliseconds) periods. (In the L98, all injectors on one side of the engine fire at the same time followed by all injectors on the other side firing at the same time. On the LT-1, the injectors are fired individually at the appropriate time).
The ECM will also pull in the fuel pump relay in effect paralleling it electrically with the oil pressure switch. (If the fuel pump relay fails, you can still normally get the car to start and run unless you can’t make at least 4 PSI oil pressure. This is a “limp home mode” feature put in place to allow for a fuel pump relay failure).
Thread Starter
Pro
Joined: May 2006
Posts: 536
Likes: 0
From: Humble Texas
