4.8 starts then dies
07-15-2011, 10:33 PM
#1
Staging Lane
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4.8 starts then dies Hey guys. I am about to be swapping a 2007 4.8 LR4 into my s10. I am running it with an 02 fbody ecu and modified harness. Has an ls1 intake, throttle body, and injectors from the same 02 f-body. Also has Lq4 coils. I had the ecu flashed with a 4.8 base tune from Speed inc. Also had them remove vats, post cat o2 sensors, egr, evap, a/c and low oil level sensor.
Right now I have it set up to run on the engine stand. Every time I start it, it runs for about two seconds and then shuts off. The only sensors I don't have hooked up are the front o2 sensors. I have tried starting it without the maf plugged in and this made no change. Any ideas or suggestions you have would be appreciated! Here is a vid of what its doing when I try to start it. Don't mind the hose nozzle plugging the egr hole lol. Its all I could find on short notice. It does not leak at all though.
Right now I have it set up to run on the engine stand. Every time I start it, it runs for about two seconds and then shuts off. The only sensors I don't have hooked up are the front o2 sensors. I have tried starting it without the maf plugged in and this made no change. Any ideas or suggestions you have would be appreciated! Here is a vid of what its doing when I try to start it. Don't mind the hose nozzle plugging the egr hole lol. Its all I could find on short notice. It does not leak at all though.
07-16-2011, 12:30 AM
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Hey Anthony, I'm not sure you could ran the ecu without the front o2 sensors, you should ask the tuner you know about this, and it looks like is something very simple.
07-18-2011, 07:59 PM
#3
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Got it fixed. Ended up being the VATS still enabled. Speed inc got it fixed for me on the spot. Tried the new tune today and it fired up first try, and idled perfectly.
