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03-21-2018, 02:48 PM | #1 |
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Location: Redmond, WA
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Re: 6.0 runs and quits
But who cares about the HPT proprietary stuff for a naturally aspirated pickup like this? Are you saying he needs any of that?
I'd unplug the MAF and drive it. The speed density tune is excellent, at least in the LS3. And to be honest I'd trust GM's SD tune a lot more than I would HPT, all else being equal.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
03-21-2018, 04:17 PM | #2 | |
meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: 6.0 runs and quits
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And the Enhanced SD is actually great for N/A motors, specifically those with significant cam. GM's SD and HPT's SD aren't the same, so all things are not equal. My intent isn't to debate SD efficacy, we can do that in another thread if you want. I'm simply saying its unlikely to be the OP's problem on his tune being SD-only, since that in and of itself, is less likely to start. If I'm wrong and his tuner did that, then so be it, at least his problem gets solved.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD
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03-21-2018, 07:59 PM | #3 |
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Join Date: Jun 2003
Location: ga
Posts: 630
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Re: 6.0 runs and quits
I have not heard back from the tune guy yet . I did try another maf sensor that I had laying around and as soon as I pluged it up the engine stublemed and just cut off again . so that tells me something is not wired rite or tuned . I have another truck with a 2006 6.0 and it has the maf and runs fine. and I am gona try to unplug it and see how it runs with it unhooked I will try it tomorrow and post how it does with the maf unplugged its been a long cold and windy day in ga.
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03-31-2018, 03:47 PM | #4 | |
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Re: 6.0 runs and quits
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4x4k30 if trouble was money i would have plenty |
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03-31-2018, 05:56 PM | #5 |
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Location: Manchester, CT
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Re: 6.0 runs and quits
Open exhausts,eh? How close to the openings are the O2 sensors located? I'll bet they are seeing all that fresh air on reverse pulses, causing them to "see" a lean condition, then giving the PCM a rich command to the injectors, creating the over-rich gas smell and stumble. You need to look at live data and see what the O2's are doing
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03-30-2018, 03:30 AM | #6 | |
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Location: Bay Area, Ca
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Re: 6.0 runs and quits
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Take this in to consideration. GM's fall back SD mode puts you in a low timing table with most ECU's. Commanded timing in this "low" timing table has anywhere from 10-15* of advance pulled. In addition every one I have forced in to SD by either unplugging the MAF or failing it through the tune has required VE table clean up. They are no where near stoich at idle/light throttle and are heavily relying on the factory narrow band O2 sensors to compensate which are not tied in to WOT fueling which should absolutely be addressed.
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------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49 |
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03-30-2018, 10:48 AM | #7 | |||
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Join Date: Aug 2006
Location: Redmond, WA
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Re: 6.0 runs and quits
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Quote:
You'd want to fix the fallback timing table and clean up the VE if that's true, though I haven't actually encountered either, I'm by no means familiar with every GM ECM. You guys are sorta funny - I've been daily driving the car you guys are afraid won't even run this whole thread! What doom and gloom! Of course I can only claim this for the LS3 but it works great. Quote:
Stop cleaning and replacing your MAF, there's nothing wrong with it!
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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03-30-2018, 12:16 PM | #8 | |
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Join Date: Nov 2007
Location: Bay Area, Ca
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Re: 6.0 runs and quits
GM never intended a MAF based vehicles fail safe SD system to be the main program to run from. It is intended to get you off the freeway and home safely, then to get it fixed.
I have done my fair share of disconnected MAF driving, I am not afraid of any near term issues. However contrary to popular belief, a severely retarded tune up couple with excess fuel causes damage. It might not be right away but over time things can get ugly. Washing cyls down Excessive fuel IE Rich condition can cause predetonation Add predetonation to fuel seeping between the rings and well so much for ringlands Fuel in the oil I am a big proponent of SD tuning, but not what is in the stock tune. May I ask how long you have been "tuning" GM ECU's? I am always learning and have been doing it since 2001. The truck I race is in HPT 1bar SD mode 95% of the 200 cars I have tuned are in SD mode or i started there. Quote:
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------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49 |
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