vortec 350

  1. B

    Weird engine stumble / misfire

    Sorry if this is the wrong place to put this thread I’m new to the forum and only really use facebook groups. This is kind of a long one but my truck was running good until I switched over to an mpfi spider injector system (a “reman” acdelco unit from a guy on eBay) and after installation the...
  2. id3f

    '98 L31 Cam Suggestions?

    I've got a 1998 L31 and I'm looking for recommendations for a cam and supporting mods or kit (+ lifters?). I made a post previously asking about this but never got a response so I'm dumbing it down some. Looking for more power but also something daily drivable. Probably around the 350-400hp...
  3. id3f

    1998 L31 Build Q's

    I have a mostly stock 1998 5.7L in my 1997 C1500. Recently swapped this motor in after purchasing the truck from the previous owner who has blown up the old one. The dash read 90k miles on the truck the motor came from. Accurate? Not sure. It has long tubes into a Y into a side dump with no cats...
  4. R

    Instrument panel dash wiring harness and dash fuse box

    Hi, I have a 1997 Sierra C1500 with the 5.7 Vortec engine. A few days ago, it started having several electrical problems. Today, while checking it, I came across something that shocked me; all the wires in the instrument cluster harness are completely exposed. It's as if the insulation has...
    • Rimeldo Quinto
    • Thread
    • c1500 dash electrial issues gmc gmc c1500 harness vortec 350
    • Replies: 2
    • Forum: Electronics
  5. S

    94 carbed 350 to 96-2000 350 swap

    I have a 94 c1500 that originally had a tbi 350. Carb swap was done ran for a bit now need a motor. I’m looking at the atk stage 3 vortec 350 on summit (HP99C) I believe I have the correct setup already for fuel delivery as I have a carb. I am mainly concerned about accessories and pulleys...
  6. Redneck250033

    how to get a 350 TBI Vortec to run in a 91 without the crank positioning sensor?

    I know that in late 1994 they started putting the TBI vortec in the trucks and I’m trying to figure out how to make it run in a 91 Chevy Silverado being at the 91 Chevy does not have the wiring for a crank positioning sensor. And the 91 Chevy was dependent on the pick up coil in the distributor...
  7. RP95

    5.7 Vortec CMP Retard Adjustment *SOLVED*

    Hey all 1999 K3500 188,000km 5.7 Vortec Had the P1345 code and the truck was dog slow and drinking fuel like crazy Replaced the distributor and attempted to dial in the crank retard but with the distributor rotated as absolutely far as it will go we cannot dial it in any lower than 9 degrees...
  8. HighRoadZ71

    Misfire, 60-70mph at Cruise

    Hi all, relatively new to the forum but spend a good amount of time lurking. I have a 1999 Tahoe Z71 5.7 Vortec. I bought the truck last February, and around September it developed a misfire at highway speeds, but only when ascending a hill trying to maintain 65-75mph. The truck had roughly 183k...
  9. V

    1998 K1500 blowing white vapor, but no coolant loss

    A few days ago my truck began tremendously loosing power. After arriving home I noticed it was blowing white vapor out of the exhaust. My original assumption is it’s a cracked head, blown head gasket, or some other gasket. However I have not lost any coolant, the oil looks just fine, and it...
  10. BrownDogg

    Engine passed away after true dual install

    I need you super smart fellas to help me figure this out. I have a 95 that I installed a 96-00 vortec in. Had the chip reprogrammed and everything was running pretty good for about a year. I decided I wanted true duals and had them installed. The day of the installation, riding home I noticed it...
  11. OhmanSWE

    Help getting a oil pressure gauge installed

    Hello! I have a Cadillac deville 1966 where the previus owner engine swap to a 5.7L vortec 1997. I would like to install a oil pressure gauge, where can i install it and how? I have read it could be behind the oil filter where i should be able to screw in a nipple and get the tube from the gauge...
  12. OhmanSWE

    Cadillac with a 5.7 vortec

    bought a cadillac not too long ago, previous owner put in a L31 5.7L 350 vortec from a chevrolet express van 1997. The previous owner put it in just to test and see if everything works. Now it's time for me to clean it up in the engine bay and make it look nice. Anyone have any tips on what...
  13. Alan M

    L31 Intake Spacer

    Hello group, I'm looking for a Taylor Cable 11011 Vmax Intake Spacer. If there is anyone that has one and like to sell it I'm willing to buy it. Thank you
  14. B

    No-Start Vortec 350

    Hello everyone! This is my first time posting in a Forum like this, I would usually just find the information I need and it ends up working out for me. Anyway, I have a Vortec 350 (L31) out of a 1997 K1500 and put it into my 1986 c10. This was my first time working on a vehicle so YouTube was a...
  15. N

    98 5.7 Vortec Rough Idle and stumbles after running down the road for 20 mins

    Hey everyone I have a 98 Chevy C2500 with the automatic transmission and my truck starts up perfectly fine and runs fine but as soon as I drive it for I'd say about 20 mins easy it decides to idle rough and shake the cab at 550 rpm and if I push the gas it struggles then runs perfectly fine...
  16. xXxPARAGONxXx

    Refurbishing Throttle Body

    For the Vortec 5.7L (L31), what all would be involved in refurbishing the throttle body to a like new condition? I can replace the sensors. I can spray it thoroughly with throttle body cleaner. I am looking at some photos online, and there appears to be a bearing that the butterfly throttle...
  17. Jesse_Wenting

    Running a Vortec 5L with a 5.7 PCM..

    Been using the PCM from the parts truck the 5L was in for a few months now, but it thinks I'm geared to 3.73 and am running 254/75R16s (30.5s). The 5.7L PCM (which is now back in the truck with the 5L engine and running) obviously thinks the engine is bigger, but is correctly programmed for the...
  18. wyn97

    '97 Vortec to Holley EFI

    I am eyeballing a future project involving a 4bbl L31 intake and a Holley Terminator 4bbl kit with transmission control, and even adding in the Holley ignition parts if I don't feel like integrating the Vortec distributor. That should take care of the engine and the transmission control. What I...
  19. Jkenney_

    97 vortec running rough, need help

    Looking for some advice, I had an intake manifold gasket go bad so took it apart to replace them. Ran fine before I did this, put in new fuel filter, distributor cap and rotor, plugs and wires while I had it apart, now it won't idle and sounds like theres a bad misfire. I can get it started and...
  20. 9

    5.7 Vortec cold tap/knock HELP!

    So about a year ago, my head gasket blew on my 99 Classic. Had the heads professionally redone and had the lifters, rockers etc out. Fixed it up nice. Since then I have had a real bad cold start tap/knock. Engine didnt exceed 100⁰C when the gaskets went. The truck has about 330,000km (about...
  21. S

    96 C2500 dies after 10 minutes then never starts..

    Hey all! I am actually posting this for my neighbor. He has a 96 C2500 ECLB with the 350. He bought it cheap with a blown motor, put another one in it, got it running. Well a couple of times it would randomly cut off, then start right back up. Now, it only runs for about 10 minutes after letting...

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