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Old 06-22-2010, 06:21 PM
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AC codes and stock tuning

hello guys , i have a question that i hope i can get some help with. last week my truck went into the shop to have a new oil pan installed. my old one had started to leak badly. so while the engine was out of the truck i had the shop install new AC codes. today i got a call that everything is back together with the new injectors but the engine is running terrible. i told them that i had left the banks chip in the ecu thinking that maybe that would affect the tuning in some way. i thought that AC codes would run fine in a stock truck or with any kind of tune? i orderd wildman tunes last week to get the full potential of all my mods. am i missing something or do i need to take time off work to make sure the shop didnt miss something. thanks
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Old 06-22-2010, 08:12 PM
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other than not purging all of the air out of the oil galley, what would make the engine not run smooth? thanks for your help.
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Old 06-23-2010, 05:48 AM
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Nothing as long as the nozzles are the same size as stock.

It should run just fine once all of the air is out of the HPO system.

Drive it a while.
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Old 06-23-2010, 01:44 PM
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If it doesn't get better over time, check the IDM. With my truck i know i have 2 weak injectors. But it's ran extremely rough and like crap since i bought it. Friday the IDM went out and shut down the passenger side bank. I'm now running a good IDM, and my truck runs really smooth and really good. So if possible, just swap in a known good IDM and see what happens. It only takes 5-10 minutes at the most on these trucks, and its a easy way to rule it out. And when we were diagnosing my truck, we never even thought of the IDM.
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Old 06-23-2010, 08:28 PM
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thanks for the replies guy's. truck is coming home tomorrow, so i'll drive it and see what happens. purging the air out was what i was thinking was causing it to run rough. thanks again
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Old 06-24-2010, 03:47 PM
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One of ther very first things I did to my 96 was install new AC injectors. I had no other mods at the time other than maybe intake and downpipe. It ran way better after they were installed. So........if your problem doesn't clear up in an hour or two of running (which I avoided by the way I purged the air before starting it) they you have a problem caused by or agrivated by the installation of the new injectors, or even an oil pickup tube suction leak. DO NOT let anyone tell you the change of injector codes is the cause. Were the injectors new or reman? Even new parts can be defective so if allowing time for the air to purge doesn't clear it up, stop assuming and guessing and start diagnosing.
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Old 06-24-2010, 06:43 PM
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thanks for the feed back garbage mechanic. my wife was supposed to pick the truck up today, but the shop said it wasnt quite ready and it was still running rough and they are still adament that the injectors are wrong for the truck. so my wife is gong to pick the truck up tomorrow and ill drive it around and see what happens. the shop told me they purged all of the air out of the oil lines, but i dont think they have driven the truck. would driving it help purge the air out faster?
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