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  1. D

    In desperate need of help

    It was either me turning on my headlights or the gauge cluster fuse. But I turned on head lights and change gauge cluster fuse and it fixed just for her to burp a piston and rod out the oil pan this morning cylinder one. So she’s gonna be getting a engine
  2. D

    In desperate need of help

    It runs perfectly fine without the 175 amp fuse the problem ended up headlights. When I turned my headlights on I started seeing 14 volts... the truck threw the cyl 1 piston out the bottom of the oil pan.
  3. D

    In desperate need of help

    is it possible to run a jumper wire to ign fuse to the alternator connector?
  4. D

    In desperate need of help

    I think so i hooked a test light into connector of the alternator. Didn’t get anything. What is the function of the brown wire that goes images the connector
  5. D

    In desperate need of help

    I think it may be a resistor wire? Idk My alternator is fine I went and got it tested battery is also fine.
  6. D

    In desperate need of help

    yessterday my truck ran out of power so I went a bought a battery, a alternator and a serpentine belt. I cannot get alternator to charge the battery. All of my connections are decent I ran a multimeter test from negative side post to the positive bolt on alternator and got 12.5 v and I ran a...
  7. D

    Spider injectors

    looking for steps on how to determine if the regulator or the fuel pump is bad? I’m getting fuel to the fuel rail and every time 59psi it fires up but stalls after about 3 secs everytime. I replaced fuel pump and filter. I’m feeling like it’s the regulator because prior before this I was getting...
  8. D

    Good info wanted

    I have a 5.7 vortec L31 in my yukon. looking to rebuild the whole bottom end. What would be the best overhaul kit to purchase? what are things that are a absolute need to replace. Im getting all of my overhaul rebuilding instructions from haynes overhaul manuals, youtube and general knowledge...
  9. D

    Is it possible

    Is there anyway to check for compression while engine is out of vehicle. I have a 1998 Yukon 5.7 vortec L31. And looking to purchase a used engine because I’m running low on money.
  10. D

    After Installation

    so if I wanted to pull a motor from the junkyard the only way to know if it’s good is it pull the oil pan and inspect it?
  11. D

    After Installation

    I have a 98 Yukon with 5.7L L31 I’m planning to replace the engine out with another used 5.7l. I have a few questions that need to be answered before I get started. I’m good on removing and installing but after installation will there be any electronic procedures like a tune or would I need my...
  12. D

    What are thes high performance parts?

    I stole this pic from ig. Does anyone knows what’s going on here it’s the first time I’ve seen an L31 like such. Is that cold air intake idk? I want to know?
  13. D

    Head Replacement

    I did the compression test today. I’m guessing the engines going to have to get replaced because #cylinder 4 wasn’t going past 10. First try at crank I got 60Psi and 2nd try at crank I got a little over 90psi.
  14. D

    Head Replacement

    Ok I’m going to do that when I get home today
  15. D

    Head Replacement

    I checked the the opposite side of cylinder 4 I got 120
  16. D

    Head Replacement

    Is that compression any good
  17. D

    Head Replacement

    I’ve replaced the distributor, cap and rotor I have newer injectors, spark plug and wires, crankshaft sensor, cam shaft sensor. I hooked up a spark plug tester to see if the spark to the plug and i did see spark. Here’s misfire data.
  18. D

    Head Replacement

    5.7l Vortec L31
  19. D

    Head Replacement

    I have a 1998 GMC Yukon with 230000 miles. It’s running a cylinder 4 Misfire. Me and my buddy at work looked inside cylinder 4 spark hole and seen a tiny spot of rust on the right side valve so we’re thinking it’s a stuck because the other side was pretty wet. I’m pretty low on money so I’m...
  20. D

    Help!

    I’m also getting codes C0281: Stoplamp Switch Circuit P0719: Brake switch Circuit- Low input
  21. D

    Help!

    I have a 1998 Yukon. My problem is the passenger side brake light doesn’t work and a rapid blinker when turning right. I have new bulbs a new circuit board and I made a new clean ground in the rear under the gas entry. I tested both connectors with a test light on both sides in the rear and the...
  22. D

    NEED HELP

    Thanks!! That was definitely the problem It was the Ground towards the back of the engine block. I have more questions if you wouldn’t mind helping me. I have a p0304 code. I have new injectors new wires and plugs, new cap and rotor. I pulled the plug and it was a bit oily. I bought a...
  23. D

    Electrical issue

    m having a electrical issue. When I pull my truck out of park my hatch unlocks When I turn the dome overide switch on for my lights. The gauge lights up my both turn signals and highbeam lights are on and solid. When I’m driving I see the temperature on my rear view mirror turning off and on ...
  24. D

    NEED HELP

    I’m having a electrical issue. When I pull my truck out of park my hatch unlocks When I turn the dome overide switch on for my lights. The gauge lights up my both turn signals and highbeam lights are on and solid. When I’m driving I see the temperature on my rear view mirror turning off and on...

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