engine dies immediately but fires off great.
08-12-2007, 10:08 PM
#1
engine dies immediately but fires off great. OK guys. I did a quick search but simply don't have the time to do a thorough search, so please be patient with me.
2000 5.3 swap running in SD. The engine fires off instantly but dies instantly as well. It doesn't stumbled or stutter. It's being turned off some how. I have some codes but only one catches my eye and that is 1626 which refers to the anitheft fuel cutoff circuit.My fuel pressure stay right at 60 the whole time. Also, my tuner checked and he has turned off VATS. Could he have missed something? Admittedly the wiring is not complete because of time constraints. The forward O2s are not wired in nor is low coolant, low oil, or oil pressure. Supposedly I do not need those. The computer will be programmed to run in open loop only for my immediate needs. This of course will be changed.
I'm at a loss right now trying to figure this out. I have only a couple days to get this thing drivable so it can move on its own and I have just spent 13 hours with it so I'm exhausted. Any help is greatly appreciated.
EDIT: the engine and ECM are 2000 not 2001. I doubt that matters but just to be sure I have everything correct I changed it
EDIT: Also this engine has a cable operated throttle body
2000 5.3 swap running in SD. The engine fires off instantly but dies instantly as well. It doesn't stumbled or stutter. It's being turned off some how. I have some codes but only one catches my eye and that is 1626 which refers to the anitheft fuel cutoff circuit.My fuel pressure stay right at 60 the whole time. Also, my tuner checked and he has turned off VATS. Could he have missed something? Admittedly the wiring is not complete because of time constraints. The forward O2s are not wired in nor is low coolant, low oil, or oil pressure. Supposedly I do not need those. The computer will be programmed to run in open loop only for my immediate needs. This of course will be changed.
I'm at a loss right now trying to figure this out. I have only a couple days to get this thing drivable so it can move on its own and I have just spent 13 hours with it so I'm exhausted. Any help is greatly appreciated.
EDIT: the engine and ECM are 2000 not 2001. I doubt that matters but just to be sure I have everything correct I changed it
EDIT: Also this engine has a cable operated throttle body
Last edited by Snow Dog; 08-13-2007 at 12:41 PM.
08-12-2007, 10:32 PM
#3
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Off the top of my head it sound like an IAC problem with it starting up and immediately dying but since you have a code for the sec. syst. .... 
Can you get it to run playing with the gas pedal? Holding it 25-50% open and trying to start it?
Can you get it to run playing with the gas pedal? Holding it 25-50% open and trying to start it?
08-12-2007, 10:36 PM
#4
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Sounds like either A) VATS is still enabled, or B) one or more of the power lines is only hot in START and not START+RUN. It'd really help to throw a scan tool on it and see what the computer thinks is going on...
08-12-2007, 11:44 PM
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possibly a crank pos. sensor have to put a scan tool on it and see if its reading any rpm,if not i would start there and if its reading rpm i would check fuel system
08-13-2007, 07:41 AM
#6
Thanks guys.
Sometimes I could get it to rev once or twice very quickly but it would still die in the same manner.
What specific things should I look for on the scanner in regards to VATS or whatever else you are thinking of Rodder.
Thanks
Sometimes I could get it to rev once or twice very quickly but it would still die in the same manner.
What specific things should I look for on the scanner in regards to VATS or whatever else you are thinking of Rodder.
Thanks
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08-13-2007, 01:24 PM
#10
OK I am using a Snap On tech one, so consequently they may use different abreviations. Here is what I have found
All sensors that are hooked up are working. Low coolant, oil pressure, and oil level are the only ones not hooked up. I am going to go through and manually check that each sensor has voltage to it.
Here is what I found on the scanner that I am unsure of.
FT diag inhibit yes
VTD toggles between on and off with the ignition simply turned on
PCM VTD Fail no
IGN Fuel VTD no
All sensors that are hooked up are working. Low coolant, oil pressure, and oil level are the only ones not hooked up. I am going to go through and manually check that each sensor has voltage to it.
Here is what I found on the scanner that I am unsure of.
FT diag inhibit yes
VTD toggles between on and off with the ignition simply turned on
PCM VTD Fail no
IGN Fuel VTD no
08-13-2007, 01:55 PM
#11
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If it comes down to it... and you're not 100% positive that VATS is completely removed, you can build a VATS disable box to test with pretty cheaply. Plans are in one of the stickies of this section.
08-13-2007, 02:12 PM
#13
OK more info or testing I have done. The fuel pump is s being turned off after the car dies. So it's not fuel. Also, I held on to the start switch longer than you're supposed to. I did this to see if I had a wiring problem where a sensor or wire was going dead in on but being powered in start. Engine still dies. I'm leaning towards a VATS problem at this point. The only other issue is that the engine is running in SD. I am not getting any MAF codes but there might be something going on there still. My tuner is using FlashScan and the ECM is still programmed as a truck.
08-13-2007, 02:44 PM
#14
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Was there any tuning done at the same time? I'm no tuner, but I remember hearing about a start up enrichment table. Does the car act like it's being turned off at the key, or does it slowly die?
08-14-2007, 01:39 PM
#17
I was going to suggest it wasn't seeing the right fuel in the tune or the tune got corupted. When I recently fired my 63 P/U it was too lean and would fire and die just like you are describing. I added some fuel down bottom of the tune and It ran great for a few days while I was dialing in the VE. Then something happened making some changes to the VE and the tune got corupted. I couldn't get it to stay running nor move. I put an older tune back in it, A OK again.
