Motor starts and then dies? Sounds like VATS, but....
08-06-2011, 06:26 PM
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Motor starts and then dies? Sounds like VATS, but.... Need some help here guys - I'm stumped!! This spring I pulled my running 2004 LS1 from my '69 camaro to install a brand new LS6 crate motor with a magna charger. The car sat for 3-4 months with the battery unplugged.. I finally got the motor in and all hooked back up and went to fire it up today, it runs and idles perfectly for 3-5 seconds and then dies like you cut a wire! No spittin, no sputterin' - just dies! The motor will even rev up if you do it within the first couple seconds!!
It will usually start back up and run for a few more seconds and dies again. Then it wont fire unless it sits for about 5-10 minutes and then it does the same thing again. Runs perfectly for 3-5 seconds and then dies.. Sounds exactly like VATS from what I read on here, but I dont understand as the car ran great this spring with he '04 LS1 in it? I had the harness reworked and computer flashed by Speartech a year ago. I was going to call John on Monday and pick his brain.
I checked all my connections, injectors, fuel pump, fuel pressure, grounds, fuses and everything seems to be hooked up right.. Is there anything else I am missing that might cause this? About the only thing different was the magna charger, which has no electrical connections. The only new electrical that I hooked up was the water pump for the intercooler and it runs fine.
Appreciate any help or ideas! Thanks, Jason.
It will usually start back up and run for a few more seconds and dies again. Then it wont fire unless it sits for about 5-10 minutes and then it does the same thing again. Runs perfectly for 3-5 seconds and then dies.. Sounds exactly like VATS from what I read on here, but I dont understand as the car ran great this spring with he '04 LS1 in it? I had the harness reworked and computer flashed by Speartech a year ago. I was going to call John on Monday and pick his brain.
I checked all my connections, injectors, fuel pump, fuel pressure, grounds, fuses and everything seems to be hooked up right.. Is there anything else I am missing that might cause this? About the only thing different was the magna charger, which has no electrical connections. The only new electrical that I hooked up was the water pump for the intercooler and it runs fine.
Appreciate any help or ideas! Thanks, Jason.
08-07-2011, 07:10 AM
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Couple other things I can think of is when I was hooking up the battery, the + terminal arc'd pretty good a couple times when trying to hook it up and I couldnt figure out why? Later I found that the + terminal on battery cable at the starter end had rubbed through the shrink wrap tubing and was grounding out on the starter case. I'd wondered at the time if I had done damage to the starter solenoid or possibly the CPU? No fuses ever poped and the stater works fine and everything else seems to be working ok - just wont stay running. Just a thought.
Last, I don't have the IAT sensor in the supercharger hooked up becuase I wasnt running an IAT sensor with my old set-up, but I dont see how that could effect anything. Again, appreciate any help. Thanks, Jason.
Last, I don't have the IAT sensor in the supercharger hooked up becuase I wasnt running an IAT sensor with my old set-up, but I dont see how that could effect anything. Again, appreciate any help. Thanks, Jason.
08-07-2011, 10:06 AM
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only code it is throwing is a P0102 - mass air circuit low. The MAF is new and worked ok with the other motor. The motor starts and runs for 3-4 seconds with or without the MAF plugged in. For what that's worth..?
08-07-2011, 02:42 PM
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http://youtu.be/CDZLfw0rEZE
Got her running.. I guess just unhooking the battery a couple times and letting it run long enough to re-learn? Seems to be running and starting fine now. Took her on a short trip around the block. Didnt lay the wood to it, but just a couple quick 1/2 throttle squirts - OMG wicked... :-)
Got her running.. I guess just unhooking the battery a couple times and letting it run long enough to re-learn? Seems to be running and starting fine now. Took her on a short trip around the block. Didnt lay the wood to it, but just a couple quick 1/2 throttle squirts - OMG wicked... :-)
