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  1. studigggs

    GMT400 - Community Scan Tool

    Truck running rough? Maybe you want to throw some parts at the 'ole girl to make it right. But which part? There are so many. Perhaps you were in the driveway with the hood open, intensely staring at the engine to telepathically coerce it into functioning again when your neighbor stops by. His...
  2. studigggs

    Aux Cooling Fan Install

    Truck is a 1990 k1500 with the 5.7. Goal for this project was simply to help out the A/C while stationary when the coolant temp is between 195 and 210 (thermal clutch engages). You'll need: GM Aux Fan GM GENUINE 158686 Pigtail, GM OE PT723 30A relay 20A inline fuse holder Buttsplices...
  3. studigggs

    MT2500 Demo on 1990 5.7L TBI

    I see a lot of posts regarding which scan tool to buy, and I'd just like to post some videos of a snap-on mt2500 interfacing with my 1990 K1500 5.7L to help guide those decsions. Besides data the PIDs, one of the biggest benefits of the snap-on scanners is the troubleshooter. For a beginner, the...
  4. studigggs

    Learned something new...

    Driving this thing since '93 and never knew the underhood light had a magnet in the base...not an item I use often, but when needed I always used the cord to snag an edge above where I'm working. Anyone else NOT know this?
  5. studigggs

    Question on YCC Grille

    Body shop near me is clearing out stock and says they have an "OEM Grille" for my 1990. The picture he sent shows a "YCC" brand in the box. For anyone thats used them, are YCC any good and is YCC an OEM manufacturer? Seems sketchy. Thanks.
  6. studigggs

    Adding Factory Trans Oil Cooler

    Adding Factory trans oil cooler to trucks that never had it. Parts: Cooler (1): 15990593 - Amazon Cooler Line (1): 15982923 - RockAuto Cooler Line (1): 15990062 - RockAuto Cooler Quick Connect: GM 15718023 - Amazon Nylon Hose Clip (2): 15738800 - eBay Bracket, Lower (1): 15974696 - eBay...
  7. studigggs

    PSA: Prime Day for Delco Parts

    RockAuto is my goto parts shop, but there are some pretty good deals on Amazon today. To avoid knockoffs I stick to the "AC Delco" storefront on Amazon. Filter by "Prime Day Deals" and you can find a lot of OEM parts for 20% off. I stocked up on an extra ICM, O2 sensor, cap, rotor, plugs, etc...
  8. studigggs

    Upper Transmission Cooler Bracket

    Wanted, upper transmission cooler bracket as shown below. Thanks in advance.
  9. studigggs

    POS/NEG/PORT EGR Valve

    Hope all are doing well. My 1990 5.7L under 8500 GVWR requires a Negative Backpressure (NEG) EGR valve according to my service manual. From what i can tell, a mechanic installed a PORT EGR valve on my truck 10+ years ago which leaks down when vacuum is applied. Anyone have any insight on this...
  10. studigggs

    1997 Hardcopy Service and Repair Manuals - Great Condition

    Sure, we all have the digital versions, but having the book is so much nicer. Includes the Service (book 1 and 2) and Unit Repair manual (with Supplement) and A/C manual. Looks to be used sparingly. No grease marks, a few small tears on the covers. Writing on one cover. $120 shipped via media...
  11. studigggs

    Had Some "Fun" Today

    1990 K1500 5.7. I have never felt good about setting base timing. Always felt like I was just getting it close and going with it. This is probably fine, but it never sat right with me and I always questioned if my base timing was really at 0deg. Well, today I believe I got it right. I connected...
  12. studigggs

    MT2500 Red Brick Scan Tool with Version 7.2 (US/Asian through 2006)

    Album: https://imgur.com/gallery/rleCs36 Version 7.2, Vehicle coverage from 1980 - 2006 Asian and Domestic only. This is a fairly rare cartridge to have. Will perform functional tests (ABS Bleed, Power Balance, EVAP, CKP Learn) Includes CAN1B adapter and K20 which allows you to scan CANBUS...
    • studigggs
    • Thread
    • abs bleed scan tool scanner
    • Replies: 1
    • Forum: For Sale
  13. studigggs

    TBI Rough Idle when warm

    So I noticed my '90 K1500 5.7L was idling rough in closed loop a couple weeks ago. Hooked up the scanner today and see that at warm idle, my IAC was dropping to 7-13 whereas I recall it generally stays around 30-40 at warm idle (been a little while since I've scanned this truck). In closed loop...
  14. studigggs

    R4 Scroll Compressor Experience

    I know by writing this I will have doomed my compressor to fail, but here goes. I've been through five R4 compressors in the last 6 years (tried New Delco, New 4Seasons, Reman 4Seasons) and all of them failed in a similar manner... upon restart after a heat soak in the desert summer (105+ deg)...
  15. studigggs

    1990 Stepside, Which hitch?

    Need some help. Is there an aftermarket class III (or higher) hitch out there that will fit my 1990 stepside AND allow me to carry a full-size spare? If someone has one, please let me know what model you are using. etrailer was no help. The one they recommended looked great, but sat too far...
  16. studigggs

    350 TBI: Scanner Shows Knocking on Acceleration

    1990 5.7 TBI. So I just picked up an MT2500 scanner and have been playing around with it. I notice that the knock sensor is going off whenever I accelerate (even with mild throttle). Is this normal? Engine runs smooth, no CEL, no modifications from OEM. I'm guessing this is the way its supposed...
  17. studigggs

    Tech 2 - What does it do?

    Considering buying a tech 2 knockoff to tinker with my '90 5.7 4WD. I specifically want to activate the ABS and see if it even works/get a more robust pedal, but would also like to have a more in-depth diag tool around so I can learn more about the truck. The cheapo websites state that their...
  18. studigggs

    To replace the pellet Catalytic converter or not?

    I have a 1990 5.7L @160k miles with the original pellet cat still on it. I still pass emissions and am satisfied with the way the truck scoots around. I would like to ask those that have swapped out for a newer honeycomb cat if you noticed an increase in pep, MPG etc? I have a newish Walker...
  19. studigggs

    Grommet for Spare Tire Lowering Hole

    If anyone is interested in a replacement for the plastic grommet that protects the chrome where the jack handle enters the bumper to lower the spare, I've found this Amazon item works great: uxcell Wire Protective Rubber 30mm Inner Dia Double Sided Grommet...
  20. studigggs

    Where to find plastic radiator hose strap

    looking for a replacement upper radiator strap. LMC/rock auto didn’t have for my year. 1990 350. Thanks!
  21. studigggs

    1990 Z71 intro

    Greetings. been browsing GMT400 for a few months now and the info has been great as I'm cleaning up my '90 Z71. I've had this truck since 1993. It was my daily driver through 1997 when I went full-on Dodge and It shacked up at my parents garage in Texas from 1997 - 2010. I moved it back to...

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