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383 starts and dies

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Old 02-14-2013, 11:16 PM
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Originally Posted by swift700
Charlie is a good tuner but getting everything right in a mail-order tune without logging anything is a pretty big crap shoot. I'd be surprised if 20 percent of all mail order tunes ran decently with that many mods. You need to get it to a tuner who can work with the car in person.
Old 02-15-2013, 12:25 AM
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the dealer sold me the wrong damn plug. so again its still not running. oh well. Synergy in Fremont, CA is doing my tuning next friday. they are doing my break in and all pulls until im maxed on power for 600.
Old 02-15-2013, 09:38 PM
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ok so i got the connector i needed of a wrecked 07 cobalt. installed and hooked it up. same exact issue. it made no difference. the only thing i notice is in the 3 seconds it does run i have to constantly keep the throttle open above 1/4 and even then she dies no matter what. but damn is she running rich. it burns my eyes in the garage. i think my fuel tables are way off??? any thoughts? i hooked up my obd2 scanner and the only codes i get are for the evap system and its not hooked up and i plan to tune it out. i hear no air being sucked in from the intake indicating a large vacuum leak so it should in theory run. but its not. please help. shes headed to the dyno friday and i need to get her on the trailer.
Old 02-15-2013, 09:41 PM
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Does your OBD2 scanner show STFT and LTFT?

If you feather the throttle, can you keep it running or does it just automatically die after "3 seconds"?
Old 02-15-2013, 09:44 PM
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i can keep it running but i dont like running a new engine with no run time above 3000 and im not sure give me a min ill check
Old 02-15-2013, 09:46 PM
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it shows long and short fuel trim correct?
Old 02-15-2013, 09:55 PM
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wheatley just emailed me and said the safe tune is stock except he bumped up the idle airflow
Old 02-15-2013, 09:57 PM
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I'd say the tune is out by a fair bit. I'm afraid you won't get much done until you get that tune fixed up. You don't have the tools to change it, so you'll have to somehow get it to a pro.
Old 02-15-2013, 09:59 PM
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Originally Posted by swift700
I'd say the tune is out by a fair bit. I'm afraid you won't get much done until you get that tune fixed up. You don't have the tools to change it, so you'll have to somehow get it to a pro.
i am ok with that being the issue. ill winch her on the trailer and let my tuner do his magic. i just want to make sure when i drop her off its not an issue on my end that he charges me more for to get it running.
Old 02-15-2013, 10:04 PM
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Yea that is a lot of changes for a stock tune file... Hopefully you didn't pay for that. If you could keep it running with the pedal just above idle, then you could watch the fuel trims and see if they help enough to get the thing to idle


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