misfire

  1. D

    1997 5.7 Vortec misfire/stumble

    Hello everyone I have a 1997 Suburban that's giving me a fit. Generally can diagnose anything but after thinking for a few weeks and trying a few things I'm interested to hear some ideas outside the box. Truck only has 120k original miles. The issue I have is when it warms up and goes into...
  2. rickwolhoy

    5.7 vortec random misfire HELP

    Hey all, I've been grappling with a random misfire for a while now. I have a 2000 chevy tahoe z71 with the 5.7 vortec, currently at 322k miles. About a year ago I had a bad misfire at idle on cylinder 3 and after a leak down test I found that the exhaust valve was leaking way beyond spec. I...
  3. S

    1997 K1500 5.7, new cylinder heads and gaskets, started and ran for a short while now wont start at all

    Hello, I have a 1997 K1500 5.7 Vortec. About a month ago, I was driving my truck and it was running beautifully. The engine was smooth, the transmission was shifting nice and the AC was blowing ice cold. It was a great day. I was driving down a road when suddenly I felt like the engine was...
  4. 0

    2000 454 rough idle and acceleration while cold

    I’m stumped and hope someone can help. 2000 454 k2500, hard starting, will crank forever unless you give it some gas and it’ll stumble to start, but once it does it idles at 750-850 rpm (normal?) but seems to have a misfire and you can smell gas out the exhaust. While it’s still cold (100-120 on...
  5. 2doortahoetoby

    Best choice for MPFI

    Long time viewer and reader of the threads here but I just want any possible new ideas or information on the topic. I know a lot of people recommend the mpfi conversion, and I have been needing to put a new spider in. I have been having a misfire code that won’t go away. I did my intake gaskets...
  6. George Schreffler

    Request help: L31 5.7 Cylinder 5 Misfire

    Looking for help with ideas to diagnose and fix my 1998 Chevy K1500 5.7L L31 misfire. The situation and actions I have taken to date appeaser below. Any thoughts on where to go next would be appreciated. Symptom - Cylinder 5 misfire at all engine speeds - P0300 DTC; no other DTCs. Diagnosed...
  7. obswill

    1994 c1500 350tbi surging idle

    1994 Chevy c1500 5.7 TBI I’ve been chasing and intermittent misfire and loping idle with my truck. I replaced and tested the Engine coolant temp sensor New EGR and solenoid. New MAP sensor New IAC New TPS Replaced all fuel lines, new pump, rebuilt throttle body (with gaskets) new...
  8. J

    1992 K1500 misfires under load

    Truck idles fine but runs like garbage on the road. I have replaced the fuel pump, fuel filter, injectors, rebuilt the TBI, replaced the coil, and map sensor. Please help. No check engine light
  9. J

    Please help with my first truck

    I bought a 1998 Silverado 2 days ago knowing it had some “misfire” problems but I didn’t know the causes, I’ve replaced the rotor cap and rotor and nothing really changed, sometimes it take 3 cranks to start up and sometimes it fires right up. I’ve put a video of it running, it won’t go past...
  10. OwenArkwell

    engine misfiring under load

    Im new to this Whole forum thing so I apologize in advance if this is in the wrong spot but I have an issue, I have a 1997 2 door Tahoe with the 5.7 vortec and I can not figure out how to stop it from misfiring under load, have done plugs, wires, whole new distributor, updated fuel injection...
  11. 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...
  12. T

    Misfire and voltage drop caused by instrument cluster

    Hello all, I have been chasing an issue on my 1993 C1500 5.7, engine and trans are out of a 1990 c1500. New parts include: Reman ECM, IAC, TPS, MAP, Ignition Coil, Plugs and wires, Coolant Temp Sensor, Oil Sensor., All grounds. I have been having a misfire issue, and whenever the turn signals...
  13. I

    1996 GMC Yukon 5.7 4l60e 4x4 multiple misfires but no check engine light

    I have been trying to find the cause of some performance issues. Using Dashcommand I see that most of my cylinders are having a couple misfires on my drive to work but I am not getting a check engine light. On my drive to work I got 4 misfires on cylinder 1, 1 on cylinder 2, 1 on 3, 0 on 4, 2 on...
  14. S

    Expensive trouble shooting

    I have a 2000 k2500HD with 7.4 vortec. 3 weeks ago while leaving work, like 5 miles away, I down shifted, nv4500 manual, to get into the on ramp of a highway. Immediate misfire, shaking, sputtering, loss of power, and became a massive fuel dumper as well. No engine light, throwing passenger side...
  15. S

    At my wits end.. Looking for any idea.

    Okay, this may be a long post so apologies in advance. I have a 94 1500 with the 350 TBI. I have owned this truck a little over a year now. I bought it with a blown motor because P.O decided to run it hot and then put water in the coolant and it froze and busted the block. Regardless, found a...
  16. D

    2000 Yukon Denali misfiring on cylinders 1 and 7.

    I have a 2000 yukon denali with the 5.7 vortec, that my dad stored outside for 5 years, I am trying to get it into running shape. When I first got it, I changed spark plugs and sprayed fogging oil into the cylinders, new battery, had to put in a new starter, checked the fluids, etc. At first it...

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