p0300

  1. P

    Serious ‘01 Tahoe Misfire Issues for over a month

    2001 Tahoe 5.3L V-8 202,000 miles I have been battling misfire issues for the over a month now. I first changed plugs and wires (routine maintenance) about 2-3 months ago. When I did that I noticed a slight misfire and trouble shot it down to 2 bad coils. I replaced all 8 to be safe and...
  2. P

    What is left to try?

    I have a 05’ tahoe w/5.3L, 4x4, & 300,000 original motor. “All” of my fuses are good, and battery is 1yr old and fully charged! I have replaced prior to my issue the; ignition coils, plugs, wires, timing chain w/sprockets, oil pump, water pump. Truck was in working order for yrs and started...
  3. J

    2008 Tahoe 5.3L Flex P0300 Help

    I could use some help from the group. I’m getting the P0300 misfire code with a rough idle and seems to be dumping fuel in the right bank. Ive done a significant amount of work with no results. - pulled heads and replaced AFM lifters and trays. Old lifters showed no damage. New valve seals and...
  4. A

    2001 GMC Yukon SLT 5.3L getting P0171, P0174, P0300

    Hello, first time posting. My brother in-laws Yukon started getting the P0171 and P0174 codes the other day so we cleaned the MAF sensor and the throttle body as well as replaced the engine air filter but the codes came back (he cleared them). Then he got the P0300 code soon after. The car runs...
  5. ouch_my_L4L5

    My Experience so far with 2007 Yukon. Idle issues after cam swap, P0300, P0420, tuning.

    Hello everyone! First post on the forum so here goes! Thanks for all the great information I’ve found on this forum already and I hope that this post contributes in some small way. This may be a long post and apologies in advance if this turns into a rant. Writing this out helps me organize...
    • ouch_my_L4L5
    • Thread
    • btr nsr stage 1 camshaft cam swap diablo sport idle problem idle tuning p0300 p0420
    • Replies: 16
    • Forum: Performance
  6. CruelJung

    Rough Idle @ Cold Crank (Worse in Cold Weather) + Fluctuating RPM in Drive

    I have seen other posts about similar issues to what I'm experiencing, but I haven't been able to glean any solutions from them as of yet. However, I've been doing what I can and collecting information over the past month, so hopefully the process of elimination has a head-start. Issue In...
    • CruelJung
    • Thread
    • cold start cold weather diablo predator 2 p0171 p0174 p0300 rough idle
    • Replies: 23
    • Forum: Engine & Drivetrain
  7. K

    TPS reading zero voltage

    Cruising on the highway today and CEL sets. Hooked up my scanner and its p0300. Looking at data the rest of the way home I notice my TPS has ZERO voltage via scanner. Also misfires on cylinders #1 (2 misfires), cylinder #4 (826 misfires) and cylinder #7 (3048 misfires). Truck does hesitate and...
  8. C

    99 5.7 4x4 Yukon Intermittent Run Issue

    Hey all, So I have read through several threads and see similar issues but nothing quite the same so appreciate any help. The truck will start cold just fine, and will run for 15-20mins while parked and then just cut out. It doesn't sputter at all, its just a clean cut out. Once the truck dies...
  9. E

    Broken intake valve at 113,000 miles

    Hey all! New member here and I really appreciate all of the threads on various issues. Has helped me tremendously on previous repairs. I have a 2007 Escalade AWD with the 6.2L. Recently while getting on it and accelerating on the freeway the engine straight up popped and had instant loss of...
  10. C

    2017 Chevy Tahoe chirping noise (P219B, P0306)

    I have a 2017 Chevy Tahoe that was taken in the the dealer for a misfire on cylinder #6 with code P0306 and once they replaced that one fuel injector we now got a code P219B which is a fuel/air ratio imbalance. The dealership has no clue what the problem is. First it was an issue with the other...
  11. T

    P0101 + P0300 = ?

    Hi all: I have a 2001 Chevy Tahoe with about 125K miles that doesn't get driven much. It has shown me a couple of codes over the past two months. It started with a P0101 (Mass Air Flow Circuit Range/Performance), so I replaced the MAF sensor (even I can do this without bloodshed!). It felt...
  12. Cornelius

    Chasing a P0300

    Long time lurker, seldom poster here. 2003 Yukon, 5.3l, 4wd, 215k A few months ago it popped a p0300 It runs fine, pleanty of power, good throttle response, no other codes except for the p0300 I'm starting to run out of inexpensive parts to throw at it, and so far what I've done is what is...
  13. J

    P0300, Service stabilitrack and rough idle.

    I’m at a loss. I have a 2011 Tahoe z71 that we purchased a month ago. Truck has 165k miles. It started running rough at idle and seemed to be getting bad fuel mileage. On cold starts it seems to run great and after warming up it gets a slight rough idle. Seems to lighten up when placed in park...
    • Joe W
    • Thread
    • engine idle misfire p0300 performance rough idle stabilitrak tahoe voltage z71
    • Replies: 4
    • Forum: Engine & Drivetrain
  14. K

    2002 chevy-suburban 5.3 4wd p0300 Problem Need help

    Hello all i am new to this forum and am looking for some help. 2002 chevy-suburban 5.3 4wd p0300 Problem Parts That we have replaced with new OEM. All Spark Plugs All Spark Plug Wires All Ignition Coils All Fuel Injectors Fuel Filter I had not done those and the car has 200k Miles so i...
  15. sgosa

    Misfire and no power....

    2003 Yukon, 5.3 flex fuel, 200K miles. CEL came on, but it still ran fine. A week or so later it started fluttering or missing when accelerating to merge with traffic. Within the next 10 miles it lost almost all power. Had to be towed home. Now it will barely idle. Runs very rough, seems to have...

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