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#301 |
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Re: 97 3500 454 4x4 project
Thanks Liz!
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76/77/78 Cheyenne 1997 K3500 454 soon to be 496 |
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#302 |
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Re: 97 3500 454 4x4 project
I've been checking my mileage and it has been consistently 9mpg.
I suspected my fuel pressure regulator diaphragm was leaking too, it randomly would stall while driving, sometimes starting back sometimes requiring several hours, so I ordered new injectors from 5O Motorsports and a new AC Delco fpr. Spent half a day changing them out, I didn't break any of the tabs on the rail thankfully. Got her back together and sounded awesome. Ran to town for gas and a test ride then noticed a lope at idle when I pulled into the station. On the way home it died the same way as before. Suppose I am going to have to buy a decent code reader.
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76/77/78 Cheyenne 1997 K3500 454 soon to be 496 Last edited by mingoman; 08-14-2020 at 05:26 AM. |
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#303 |
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Location: Northeast KS
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Re: 97 3500 454 4x4 project
Good pick on the injectors.
Are you sure its not a bad/dying fuel pump? For a code reader, I use the TorquePro app on my phone with a bluetooth elm reader that plugs into the OBDII port. My 454 'burb with 4.10s gets around 11.2mpg, back and forth to work. I did make 13.12mpg the other day running up the interstate to Iowa with a generator in the back at 72mph.
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1999 GMC Suburban K2500 SLT, 454/4L80E 1991 Z/28, 6.0L/T56 1949 GMC 250, S10 Frame, 6.0L/4L80E Instagram @aceshighspeedshop |
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#304 | |
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Re: 97 3500 454 4x4 project
Quote:
I did install a new Delco fuel pump while the bed was off, but I'll check the pressure just in case. Sure it wouldn't be the first time a new pump is bad.
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76/77/78 Cheyenne 1997 K3500 454 soon to be 496 |
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#305 |
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Re: 97 3500 454 4x4 project
That sucks. Do you have any codes being set though?
The only time I ever got 9mpg with my 97 454 (4.10’s) was puking a trailer with the surge brakes sticking on.
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1972 K10 1986 K30 crew cab dually 2002 Z06 2007 Escalade |
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#306 |
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Re: 97 3500 454 4x4 project
I've not had a chance to check yet. I just started the first of 6 nights. I'll check them when I'm off next and post what shows and hopefully a fix.
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76/77/78 Cheyenne 1997 K3500 454 soon to be 496 |
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#307 |
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Re: 97 3500 454 4x4 project
x2 on the 5-oh injectors, great choice. I've witnessed two sets of them fix rough running/starting 454s. I have a set waiting to go in mine. Also a 0411 w/Blackbear tune. Just need the time.
You may have solved any fuel issues you had and now something else is showing, the distributors on these things will notoriously wear out and cause the timing to jump around. There is a procedure for setting them, I'd have to look it up if you're not already familiar.
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Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 |
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#308 | |
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Re: 97 3500 454 4x4 project
Quote:
Just have to chase down the gremlin now.
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#309 |
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Re: 97 3500 454 4x4 project
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#310 |
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Re: 97 3500 454 4x4 project
I'll have an update soon. Both of my in law's passed away within a month and a half of each other plus my wife and I caught the Wuhan flu.
It's definitely fuel pump related I just haven't had a chance to pull it. I should have changed the in tank harness when I installed the new pump or maybe a bad pump. It was a Delco however.
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#311 | |
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Re: 97 3500 454 4x4 project
Quote:
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#312 |
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Re: 97 3500 454 4x4 project
Thanks! We're both fine now. She was a pretty sick girl for about 10 days while I only ran a fever parts of three.
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76/77/78 Cheyenne 1997 K3500 454 soon to be 496 |
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#313 |
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Re: 97 3500 454 4x4 project
Condolences for your loss, glad you guys are on the mend!
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1999 GMC Suburban K2500 SLT, 454/4L80E 1991 Z/28, 6.0L/T56 1949 GMC 250, S10 Frame, 6.0L/4L80E Instagram @aceshighspeedshop |
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#314 |
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Puking pulling it's all the same isn't it?
At least when the phone spell incorrector steps in to say what I'm really trying to say. It was pretty awful either way.
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1972 K10 1986 K30 crew cab dually 2002 Z06 2007 Escalade |
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#315 | |
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Re: 97 3500 454 4x4 project
Quote:
Not trying to pry but was that the cause of passing for your in-laws? ![]()
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1972 K10 1986 K30 crew cab dually 2002 Z06 2007 Escalade |
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#316 | |
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Re: 97 3500 454 4x4 project
Quote:
He was a vietnam vet and a great guy. Until the last few years he was always ready to pack up and go whenever I asked him. We made a lot of swap meets and such. My mother in law was wonderful too. I don't believe she cared for me that much 41 years ago, but I grew on her.😅
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#317 |
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Re: 97 3500 454 4x4 project
Thanks!
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76/77/78 Cheyenne 1997 K3500 454 soon to be 496 |
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#318 | |
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Re: 97 3500 454 4x4 project
Quote:
I know life is too short but at least you got to spend a good many years together.
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#319 |
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Re: 97 3500 454 4x4 project
I've had her up and running for a while now. I changed the whole fuel pump and sending unit assembly out and no more problems.
Having some fun in the ❄.
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76/77/78 Cheyenne 1997 K3500 454 soon to be 496 |
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#320 |
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Re: 97 3500 454 4x4 project
Sweet! Glad you got it sorted out.
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1972 K10 1986 K30 crew cab dually 2002 Z06 2007 Escalade |
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#321 |
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Re: 97 3500 454 4x4 project
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#322 |
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Re: 97 3500 454 4x4 project
Your rig is looking great!
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1999 GMC Suburban K2500 SLT, 454/4L80E 1991 Z/28, 6.0L/T56 1949 GMC 250, S10 Frame, 6.0L/4L80E Instagram @aceshighspeedshop |
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#323 |
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Re: 97 3500 454 4x4 project
Thanks all. I still need my bedliner and I want to ditch the single exhaust. Also, the 8.1l will go in at some point after the 454 gives up. As of now it runs like a top with 60psi oil pressure warmed up.
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#324 |
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Re: 97 3500 454 4x4 project
No updates in a while I see. My Air system had a leak, I'm pretty sure at least the line from the compressor was bad. Someone had fixed it with 4 hose clamps in the past. Regardless I changed everything out, but the evaporator. Wished I'd thought about that when the dash was out.🙄
Ran a vacuum on it today, charged her up and we have cold ac! 454 is running great still so the 8.1 will have to wait, especially with the way gas has gone.😅
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