misfire

  1. M

    2019 Yukon Stumble / Misfire, no codes

    5.3 6 speed with 80,000 miles. At light throttle there is a noticable stumble that smoothes out with RPMs.. no codes thrown. Just changed the plugs and wires - they were shot. feels like it runs a little better, but the stumble is still there. Based on some forum posts, I decided to change...
  2. Jeffs5-3

    03 GMC Yukon P0300 misfire 5.3

    Hello everyone I have an 03 Yukon with 5.3l L59 171k miles on it and it’s been a love hate relationship with the truck tbh. I have a dreaded misfire that’s just been kicking my ass and i want to address it because I want a reliable daily. I bought the truck about 2 months ago the truck had given...
  3. D

    Yukon xl misfire

    2005 gmc yukon xl Vin z, was driving up a hill in the mountains here in az started bucking and poping through the exhaust, pulled over shut the truck off waited 5 min ran fine. 4 days later same thing. Went home pulled the plugs they were orange, new plugs wires and mass air flow sensor, new...
  4. 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...
  5. C

    2013 GMC Yukon Denali 6.2L random misfire

    Hey all. I have a 2013 Yukon XL Denali with about 120K miles on it. I have it serviced about every 4-5k miles or so. Basically one day it felt like there was a misfire and before long check engine light came on. The cheaper code readers would say misfire in cylinder 3 but the fancier code...
  6. T

    Random misfire

    Ok so when I bought the truck a few years ago I would randomly get a p0300 code I'd feel it occasionally but not bad enough to be concerned. Plus I had alot of other repairs and maintenance to do. Well when I got my truck back from the trans shop I noticed the miss alot more and it's been...
  7. 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...
  8. C

    P0102 p0113 p0304

    Hi everyone im new on here i have a misfire on cyl 4 have not been able find, i replaced the air filter to a cold air intake setup as well with new MAF sensor was ok had p0171 p0174 did not pick up on my obd scanner only on my plugin from tmobile so i did not worry to much, a week or so after...
  9. 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...
  10. D

    Dielectric grease applied to both ends of ignition wires

    So, I'm a moron. It's been years since I've changed plugs and wires. This week, I installed new Delco platinum plugs and new Delco wires on my 2003 GMC Yukon 5.3L 2wd with Delphi coils, about 150k on the motor. Everything went well with getting the old plugs out and new plugs in. Then, I...
    • dukbludvl
    • Thread
    • delphi coils dielectric grease ignition coils ignition wires misfire plugs spark plugs stall wires
    • Replies: 26
    • Forum: Engine & Drivetrain
  11. Alan H Stott

    Low Idle and running lean

    Hey all so I am hoping someone here knows what is going on and how to fix it. Recently My engine has started to run lean and I am seeing the idle extremely low. My dad does not think it is a vacuum leak and told me to clean the intake and clean the filter. I run the code it says it is an O2...
  12. C

    2008 Tahoe STILL has misfire. Please send help

    Hey Y'all, March 2020 we installed a new motor and ECM ($3500) in our 2008 Tahoe LTZ 5.3. Took it to the dealership to have the computer programmed and they also changed an actuator in the transmission. (Got locked into park while it sat during motor install) ($2100) Dealership also told us...
  13. Mrfix71

    Finally - P0107 code

    For a couple weeks now, my '07 Tahoe 5.3 would lurch or stumble after restarting and leaving the store or something. Cold start would be just fine, only would act up when accelerating after the first stop. However, it would not indicate anything on the dash or throw a code when a scanner was...
  14. 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
  15. Eric De Carteret

    6.2 Hesitation

    Hey guys, I've got an 09 Yukon Denali that seems to have a slight hesitation/putter every once in a while when leaving a stop sign or a slow roll from idle. It almost feels like there might be a brief misfire but no codes are thrown. Engine temperature doesn't seem to be a factor since it...
  16. jcb2

    ‘07 Yukon 5.3L misfires in cyl. #s 2 & 7

    My ‘07 Yukon suddenly shows misfires in #7. And cylinder #2 shows about a third as much misfires. First I threw parts at it(plugs and coils) with no difference. That was just a stupid waste of money. Then I replaced the oil pressure sensor and the infamous oil screen below it. I’ve done this...
  17. R

    5.7 Engine Misfire (P0300)

    Hello, I have a 2000 Tahoe z71 classic (2000 model year, 1999 body style) that I'm having a misfire issue on. It started as a P0303 code, now it's the random p0300. The issue isn't constant, but seems to be more pronounced if I'm going uphill and I'm light on the throttle I'll get a vibration...
  18. O

    08 Tahoe ltz afm or fuel pump issues???!?

    hello I picked up my Tahoe awhile back and had all kinds of issues. Replaced the ecm and wiring harness now all is well except when it switches from v8 to v4 mode it shakes and misfires pretty bad until the check engine comes on and flashes. The check engine will turn off after 15-30 seconds and...
  19. O

    08 Tahoe ltz afm or fuel issues??!?

    hello I picked up my Tahoe awhile back and had all kinds of issues. Replaced the ecm and wiring harness now all is well except when it switches from v8 to v4 mode it shakes and misfires pretty bad until the check engine comes on and flashes. The check engine will turn off after 15-30 seconds and...
  20. 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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