adjust idle or retune?
07-31-2012, 05:17 PM
#1
Staging Lane
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adjust idle or retune? I've got a mail tune in mt 67 lsx swap, the tune that was loaded to get me up and going is hard to start and idle. Idles ok at first and gets worse as it warms up and wont star at 178 degrees or so. The motor is stock ls1 bottom and prc 5.3 heads with ms3 cam. I explained this when the ecu was programed and was told this tune would get me around till I had a tuner finish but I cant get out of the driveway. I have hp tuner and looked at the idle airflow and its the exact same as the stock 02 camaro. Can I fix this or send it out and try again?
thanx
Kevmac
thanx
Kevmac
07-31-2012, 05:32 PM
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If you've already licensed your PCM in HPT...and you're ready to do some reading....you should be able to get it going. Do you have a Wideband installed?
Also....post the tune file if ya can, and maybe some suggestions can be made.
Also....post the tune file if ya can, and maybe some suggestions can be made.
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08-02-2012, 12:24 AM
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It appears to be running so lean (judging by the O2s) that I'm surprised it's running at all. I see no evidence of any fuel trims even kicking in, as you're not even running long enough to get it to closed loop. EDIT: Looks like STFT is pegged near the end of the log. Open headers are probably not helping the narrowbands much either, but should be workable. Weird....even with STFT pegged, there is no change in O2 readings...they are hovering around 200mv. Thinking you either have dead o2's....or a wiring issue. Any chance you'll be installing a wideband soon?
PM Sent.
Ps....I'll try looking.over the tune in the am.
PM Sent.
Ps....I'll try looking.over the tune in the am.
Last edited by salemetro; 08-02-2012 at 01:29 AM.
08-02-2012, 09:48 AM
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Injector flow rate vs kpa does not appear to be correct from what I can tell. Other than that, nothing sticks out as terribly wrong. Timing looks to be very conservative, as would be expected in a startup tune. What injectors are you running....and tell me more about the fuel system (ie; regulator,etc.....)
08-02-2012, 02:19 PM
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That's what I was referring to as it being less than ideal (depending on how close to the end of the collector they are).....but I would think that they should at least switch above 200mv. They currently never do. I'm guessing that the car is going pig rich in all reality once the trims kick in and command maximum enrichment due to the o2's reading so lean.
08-02-2012, 02:41 PM
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You'll need an open loop tune if you're running open headers. The O2 sensors are way too close to the atmosphere to work appropriately unless you're constantly under heavy or WOT.
08-04-2012, 01:11 AM
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Under the Open and Closed Loop tab in HPT, select "ECT vs IAT", and change all values in this table to 285. The car will now never get warm enough to allow closed loop to enable.....meaning that STFT and LTFT will never add fuel. You will basically be running strictly off of the Primary VE table now.
Be EXTREMELY careful. I know that you said that you just wanted to be able to get the car on to the trailer under it's own power. Hopefully, this will help you out. But I can't stress this enough; Without working o2s...or ideally a good wideband o2, you're playing with the devil here. You have no way of KNOWING if the car is running rich, or running lean (other than smell....which can be misleading). If it works, just get the car on the trailer and shut it down. Better yet, do what it takes to get your narrowbands working/registering correctly and leave STFT/LTFT enabled....much safer this way.
If you need any help, you still have my number
-James-
Be EXTREMELY careful. I know that you said that you just wanted to be able to get the car on to the trailer under it's own power. Hopefully, this will help you out. But I can't stress this enough; Without working o2s...or ideally a good wideband o2, you're playing with the devil here. You have no way of KNOWING if the car is running rich, or running lean (other than smell....which can be misleading). If it works, just get the car on the trailer and shut it down. Better yet, do what it takes to get your narrowbands working/registering correctly and leave STFT/LTFT enabled....much safer this way.
If you need any help, you still have my number
-James-
08-04-2012, 05:08 PM
#17
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Am i in open loop? The startup scan show the stft going up to 50 plus after 2 min or so, I adjusted the temps to 285 across the board but i keep getting the stft's what gives?
thanx
thanx
