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  1. S

    P0300 won’t go away!!!

    Which chip did they have on yours? Mine has a hurricane chip that in cab has a little black box that has an on and off switch with a turn dial. It attaches to the ambient air sensor on the intake tube. I'm hoping this thing is what is giving me headaches.
  2. S

    Having a bad issue with my 5.7 Vortec

    You need to adjust the cam retard on the scan tool while holding RPMs at $1,000 and it needs to be within 2° negative or positive of zero. I was having the same issue reading it off of ignition timing and not Cam retard. You can read Cam retard with a Bluetooth scanner and the dash command app...
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    P1345 code assist. Questions. 1996 GMC K1500

    I'm pretty sure you're distributor is off one tooth. The timing light won't do anything for you You need to use the OBD2 adapter along with the dash command app and the extra PID that gives you cam retard position. Just like you read the cam retard position needs to be within 2° of positive or...
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    1999 5.7 350 vortec P0304 cylinder 4 misfire

    Wow this is a great breakdown! Yeah I am new here but I've been doing automotive work for better part of 25 years since before I was able to drive. I've been running a part-time automotive shop out of my garage for more than a decade so I'm pretty good with a lot of different vehicles. I know...
  5. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    How mechanically inclined are you? Those intake gaskets take aren't bad to change yourself and there's a few videos showing it. I totally get them not thinking that was it cause I did all those same tests multiple times and they checked out. The little bit of bubbles in the radiator really make...
  6. S

    New-to-me truck first tune-up 5.7L vortec

    I know that feeling all too well
  7. S

    96 GMC K1500 - P1345 code - No scanner

    Buy a Bluetooth scanner on Amazon for around $20 then get Dashcommand from the app store and purchase the extra pids for your truck from Dashcommand. There's an option in there for cmp correlation so you can set the distributor. The engine has to be warm and idling at 1000 rpm the the...
  8. S

    New-to-me truck first tune-up 5.7L vortec

    Congrats on the easy mis fix. I chased mine for 3 years.
  9. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    Okay I hope they're right!
  10. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    The amount of residue on your radiator is alarming for sure Is that rust? The stuff on your radiator cap looks like oil. I hope you don't have a bad head gasket. The stuff on your intake is probably coming from your intake gasket.
  11. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    Looking at these fuel trims I'm like 90 percent positive you need the intake gaskets replaced
  12. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    Hey sorry it takes me a while to get as. I haven't figured out how to get notifications of replies yet. Technically you could get both oil or coolant leaking from the bad gaskets. My bad gaskets looked like they were leaking coolant internally but not externally. If the shop has any questions...
  13. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    Being that you have all those codes check all your electrical connections again and grounds. It's hard to diagnose a bad ECU. If you can change those intake gaskets yourself it could save you a lot of money that way being that they are so cheap and narrow out that part of it being that such a...
  14. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    You can see in the photos where the gasket failed. The failure of those gaskets cause internal vacuum leaks that you won't see with a smoke test.
  15. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

  16. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    I'm really leaning towards it being your intake manifold gasket. I chased all this5 numerous times before doing the intake gasket since it had been done ten years prior. See what that shop wants to do it while they have it in there again. Go with the felpro or mahle metal gasket upgrade.
  17. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    Did you get this sealed up yet?
  18. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    You need to block off the air filter when you do it. I would pull the clamp on a intake hose closest to the air filter then take a plastic bag and put it in between the hose and the piping on the air filter so it's tight like Saran wrap that put the hose back on and tighten the clamp. Then...
  19. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    You should delete the extra banks in dash command that are showing fuel trims. You only need them for banks 1 and 2 short term and long term.
  20. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    Those ft numbers should still be closer to zero. Do you know how to do the test with a cigar?
  21. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    You can do a smoke test really easy with a cheap cigar.
  22. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    I use Dash command also. Did you purchase the extra pods for your truck that Dash command has available? I would like to see what your other scanner shows for fuel trim readings. The pictures you posted from it last week tell me that you need to do the intake gaskets. Like another person says...
  23. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    Have you done a smoke test?
  24. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    Do your smoke test and if What app are you using for those readings? It's showing way too many banks.
  25. S

    1999 5.7 350 vortec P0304 cylinder 4 misfire

    That's exactly what mine was doing. It's caused by an internal vacuum leak. I'm not a gambling man but I would put money on it that it's your lower intake gasket. I chased this on mine for 3 years

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