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#2551 |
Registered User
Join Date: Jun 2016
Location: Visalia California
Posts: 891
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Re: Crusty Rusty Leaky Squeaky 67 Step
Try unplugging the mass airflow sensor and take it for a drive see if it makes a change
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#2552 |
Registered User
Join Date: Jun 2016
Location: Visalia California
Posts: 891
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Re: Crusty Rusty Leaky Squeaky 67 Step
If your filter is a type that requires oil sometimes that oil will get on the mass airflow sensor and skew the reading you can also try cleaning the mass airflow sensor with brake cleaner and Shop air
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#2553 | ||
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Location: Kansas City, MO
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Re: Crusty Rusty Leaky Squeaky 67 Step
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I'm going to make another run and record data with the MAF unplugged. With it plugged in, STFT's were 25% on B1 and 28.1% on B2. Timing looked stupid too.
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Victor 57 Chevy Wagon - California Dreamin'"Mecum'd" 9/2022 Dallas, TX Crusty Rusty Leaky Squeaky 67 Consigned 4/2019 Dresden, Germany Maybelline - my '57 Ford 2dr Sedan "Mecum'd" 3/2016 Location unknown Silver Streaker "Mecum'd" 4/2013 Somewhere in Texas |
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#2554 |
Proprietor of Dale's Corner
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Location: Vacaville , CA
Posts: 16,099
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Re: Crusty Rusty Leaky Squeaky 67 Step
I sure hope it's something simple.....all this computer stuff is beyond me.
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"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man |
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#2555 |
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Join Date: Jun 2016
Location: Visalia California
Posts: 891
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Re: Crusty Rusty Leaky Squeaky 67 Step
I think the majority of your issue is with the tuning. I would still clean the mass airflow sensor and blow it out there I don't think you have a bad sensor
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#2556 |
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Join Date: Aug 2015
Location: Jackson Al
Posts: 70
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Re: Crusty Rusty Leaky Squeaky 67 Step
what size is the intake tube? The tune needs to be modified if it is larger than stock size.
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#2557 | |||
Senior Member
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Location: Kansas City, MO
Posts: 2,011
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Re: Crusty Rusty Leaky Squeaky 67 Step
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The second test drive with the MAF disconnected predictably set a DTC and the CEL was on the entire time but the truck drove great at all speeds and conditions. The trip to the tuner is 33 miles. I was planning to drive there if the truck would cooperate. Is there a downside to driving it without the MAF connected?
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Victor 57 Chevy Wagon - California Dreamin'"Mecum'd" 9/2022 Dallas, TX Crusty Rusty Leaky Squeaky 67 Consigned 4/2019 Dresden, Germany Maybelline - my '57 Ford 2dr Sedan "Mecum'd" 3/2016 Location unknown Silver Streaker "Mecum'd" 4/2013 Somewhere in Texas |
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#2558 |
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Join Date: Jun 2016
Location: Visalia California
Posts: 891
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Re: Crusty Rusty Leaky Squeaky 67 Step
No it will be fine driving it. The ecm will compensate for lost signal as you can see with the fuel trim. It sounds like it runs to lean with maf connected. Keep us posted on the tune.
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#2559 |
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Join Date: Apr 2003
Location: Indep, MO
Posts: 5,893
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Re: Crusty Rusty Leaky Squeaky 67 Step
Not for nuthin- but it seems theres a bit of a block to the mount could it be the actual sensor isnt out in the airflow enough? Just a WAG from the peanut gallery
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#2560 | ||
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Location: Kansas City, MO
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Re: Crusty Rusty Leaky Squeaky 67 Step
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![]() However, if that were a contributing factor, my mill could easily shorten up that pad. I'll see what Bryan has to say next week.
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Victor 57 Chevy Wagon - California Dreamin'"Mecum'd" 9/2022 Dallas, TX Crusty Rusty Leaky Squeaky 67 Consigned 4/2019 Dresden, Germany Maybelline - my '57 Ford 2dr Sedan "Mecum'd" 3/2016 Location unknown Silver Streaker "Mecum'd" 4/2013 Somewhere in Texas |
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#2561 |
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Join Date: Apr 2003
Location: Indep, MO
Posts: 5,893
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Re: Crusty Rusty Leaky Squeaky 67 Step
If it won't fit in the vise, I have one it will. Holler if you need anything.
Also, there's a related reply in my Big Black thread- http://67-72chevytrucks.com/vboard/s...d.php?t=767247 hope it helps.
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#2562 |
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Join Date: Jul 2012
Location: Rosenberg, Texas
Posts: 3,506
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Re: Crusty Rusty Leaky Squeaky 67 Step
Since you're talking about it, and I had a different but slightly similar issue when I first got my swap running, I'll throw this out there for you.
My STFT (short term fuel trims) were WAY off. I mean WAY WAY WAY off. They stored a 30-34 through all cells of my LTFT just to get my STFT in the 24-28 range. This is showing a severely lean condition. BUT... It smelled super rich. All things pointed to a vacuum leak, a bad connection to the O2 sensors, bad O2 sensors, or a bad MAF (although I could only fine one reference to a MAF sensor issue). I replaced the MAF and had no change. Cleaned the old one and again, no change. Couldn't find a vacuum leak anywhere either. So, I talked with my tuner, told him I had a larger intake (3.5" tube) than the van the motor came from, and wondered if he could play with the MAF tables to get it working. His first attemt was to bump it by 20% (so he told me) and it changed, but still in the low 20s for STFTs. 4 more revised tunes and I'm now at a LTFT of -3 to +4 (most at 0 to +1) and STFT of -4 to +11, most at about -3 or +5, depending on load. All of my research said if you have fuel trims beyond a +/- 15, there are some major issues. Now, that's not to say you can't drive it, but the longevity of the engine would be compromised, however slightly. Talking with a local hotrod shop, they told me as long as I had my STFT in the high teens or low 20s I'd be okay for a short period, but definitely get it checked out before your first oil change. I say all of this because you may very well have a tuning issue where the intake is allowing more air into the engine than the MAF can register due to the parameters in the tune. You may just need a good tuner to make some adjustments to the MAF tables and it COULD fix your issues. Good luck!
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#2563 |
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Location: Kansas City, MO
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Re: Crusty Rusty Leaky Squeaky 67 Step
Thanks, Duane! I printed off a copy of your remarks and will add it to my list of topics to discuss with the tuner.
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Victor 57 Chevy Wagon - California Dreamin'"Mecum'd" 9/2022 Dallas, TX Crusty Rusty Leaky Squeaky 67 Consigned 4/2019 Dresden, Germany Maybelline - my '57 Ford 2dr Sedan "Mecum'd" 3/2016 Location unknown Silver Streaker "Mecum'd" 4/2013 Somewhere in Texas |
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#2564 |
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Location: Kansas City, MO
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Re: Crusty Rusty Leaky Squeaky 67 Step
Took CRLS to have a new tune done at LSXkilr in Bonner Springs, KS this past Wednesday evening. During the Q&A before Brian got started, he speculated that the previous tune was problematic due to the fuel regulator issue. It was likely that the hard starts and other issues were traceable back to the adjustments made when the regulator was already under stress from the wrong size fuel pump. At least that was the working theory.
Brian hooked up the original MAF sensor and loaded a basic 2010 Camaro LS3 tune into the ECM and fired up the engine. It started on the first try and very quickly began to idle normally. He let it run at idle for a while so the ECM could run various diagnostics and begin learning. Ran it up to city speeds on the dyno and made some adjustments then did the first pull. Several more adjustments and three more pulls and we were done. He took it for a 20 minute test drive and I think maybe made some minor adjustments to the shift points and it was ready for me to take home. Drove like a dream with no popping and banging, surging or stalling. The numbers weren't all that impressive partly because the IAT was above 140 degrees for the last two runs and the ECM was pulling about 10 degrees of timing out under load. Still it made 333HP@5400 rpm which is a tad better than the 325HP@5400 it made at Justune. Not sure if the comparison is valid since the equipment and conditions were different, but what the heck... it's a work truck. ![]() Just a couple of more things to do. Hook the AK pushbutton start back up and install the new billet door handles. Will post up when they're done.
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Victor 57 Chevy Wagon - California Dreamin'"Mecum'd" 9/2022 Dallas, TX Crusty Rusty Leaky Squeaky 67 Consigned 4/2019 Dresden, Germany Maybelline - my '57 Ford 2dr Sedan "Mecum'd" 3/2016 Location unknown Silver Streaker "Mecum'd" 4/2013 Somewhere in Texas |
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#2565 |
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Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: Crusty Rusty Leaky Squeaky 67 Step
Awesome news! Maybe next year you can drive CRLS to Washington for Goodguys!
![]() Actually I thought your exhaust would be a bit louder but i'm sure it was muffled a bit by the dyno.
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#2566 |
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Join Date: Mar 2011
Location: Kansas City, Missouri
Posts: 3,541
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Re: Crusty Rusty Leaky Squeaky 67 Step
That’s great to hear Vic!!
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#2567 |
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Join Date: Jun 2016
Location: Visalia California
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Re: Crusty Rusty Leaky Squeaky 67 Step
Great news and makes sense why first tuner was compensating for fuel delivery issues.
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#2568 |
Proprietor of Dale's Corner
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Re: Crusty Rusty Leaky Squeaky 67 Step
Glad it's running good again. It sounds great.
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"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man |
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#2569 |
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Join Date: Apr 2003
Location: Indep, MO
Posts: 5,893
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Re: Crusty Rusty Leaky Squeaky 67 Step
Glad Bryan got you fixed up. He seems to be a good cat.
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#2570 |
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Join Date: Jul 2012
Location: Rosenberg, Texas
Posts: 3,506
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Re: Crusty Rusty Leaky Squeaky 67 Step
Great news Vic. Hopefully it'll get even better as the ECM learns and you can just jump in and enjoy CRLS like you're meant to.
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-Duane C/10 Club Texas member 1971 Chevy C10 "Brutus" SWB Fleetside 2016 6.0L (L96) 6L90E (driver/project) 1965 Pontiac GTO "Royal Goat" 400/TH400 w/AC (my baby) |
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#2571 | ||
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Location: Kansas City, MO
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Re: Crusty Rusty Leaky Squeaky 67 Step
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Thanks, Scott! Quote:
Thanks, Dale! Yes he does, Chip. He said more to me in the first couple of minutes than the first guy did the entire time I was in his shop. Main thing for me was that he seemed to really know his stuff and didn't get sidetracked by my theories. ![]() Thanks, Duane. Kathy and I took it to the car show over in Bonner Springs last Saturday and it ran like a champ all the way there and back home. We have some more cruise in's coming up and Kathy has some remodeling plans for the house so I'll take some snaps of it in the Lowe's parking lot.
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Victor 57 Chevy Wagon - California Dreamin'"Mecum'd" 9/2022 Dallas, TX Crusty Rusty Leaky Squeaky 67 Consigned 4/2019 Dresden, Germany Maybelline - my '57 Ford 2dr Sedan "Mecum'd" 3/2016 Location unknown Silver Streaker "Mecum'd" 4/2013 Somewhere in Texas |
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#2572 |
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Join Date: Apr 2014
Location: Azle,Texas
Posts: 2,248
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Re: Crusty Rusty Leaky Squeaky 67 Step
Super pumped for you sir! That's what we all want when we go to such lengths of work. Glad you're able to enjoy the fruits of your labor man! Yall enjoy.
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#2573 |
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Join Date: Oct 2012
Location: mountain home, AR
Posts: 794
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Re: Crusty Rusty Leaky Squeaky 67 Step
Man I've been hanging by a thread every day to see what the fix was going to be. Sounds like you got it nailed down. The shake down miles are always the nerve racking ones.
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#2574 |
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Location: Papillion, Ne
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Re: Crusty Rusty Leaky Squeaky 67 Step
That's great news, Vic! I knew you'd get it sorted out and start really having fun!
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#2575 |
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Join Date: Oct 2013
Location: Oklahoma City Okla
Posts: 196
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Re: Crusty Rusty Leaky Squeaky 67 Step
Glad to see you getting to enjoy the truck.
Dwight |
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