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3.4L Bogging/Flooding when Accelerating HELP

Discussion in '1st Gen Tundras (2000-2006)' started by Jonah H, Apr 21, 2020.

  1. Apr 21, 2020 at 5:08 AM
    #1
    Jonah H

    Jonah H [OP] New Member

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    2002 Tundra 3.4L 5-sp
    2" Suspension lift, 2004 Facelift, Bilstein 5100, Locker, Hellwig leaf kit
    Alright, so I have a very unique issue with my 2002 Tundra (3.4L) 4x2 and I could use some insight. I started up my truck to go to work the other day, and the engine pegged 3,000 RPMs right away and then stalled out almost immediately. I thought it was strange, and started it up again with no issue. As I left my house, I immediately noticed that the truck bogged down to about 250 RPMs, choked and backfired once when I touched the throttle. It doesn't stall completely but it runs like hot garbage and loses all power over 10-15% throttle input. It still runs and drives below about 15% throttle and doesn't throw a CEL or codes. It puffs black smoke and I average about 8 MPG when driving. It will NOT accelerate up hills, above 2500 RPM or in 4th gear. I have to milk the throttle and clutch and I have an absolute top speed of about 45 MPH downhill (after a solid minute of acceleration).

    I have searched for a week now on possible causes but I haven't seen any others with this issue.
    BLUF:
    The truck is a 2002 Tundra V6 4x2 with a manual 5-speed transmission. No issues in the past, 135,000 Miles.
    New: IAC valve, MAF sensor, air cleaner, coils, wires, plugs, ignitor, TPS, injectors, fuel filter, intake gaskets, clutch/flywheel, camshaft and crank position sensors and timing belt WITH pulleys tensioners and belts (replaced at 133,000 miles).

    Symptoms: irregular idle, piss poor acceleration and power, occasional backfire when bogging, small puffs of black smoke from the exhaust, only idle power up to 15% throttle, and flooding at normal acceleration.

    I have taken it to shops, replaced everything in the system but my truck still chokes out. The black smoke and crap MPG suggest engine flooding and potentially a timing issue- even with no codes. My crankshaft has no lateral play (reference Timmy The Toolman on YT), but I suspect my crankshaft timing gear might be stripped from the woodruff key. I don't have time to tear everything down just to inspect yet. Has anyone ever had this issue or can provide any advice at all? I'm frustrated and angry that I can't figure this out. Any help is appreciated. Thanks guys.
     
  2. Apr 21, 2020 at 5:19 AM
    #2
    TX-TRD1stGEN

    TX-TRD1stGEN Privileged

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    Seth
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    If no codes I would check timing and make sure it didn't jump or get it of wack.
     
  3. Apr 21, 2020 at 7:41 AM
    #3
    speedtre

    speedtre New Member

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    I had a 5vz (same motor) in a Tacoma that jumped timing. It never threw a code either. His symptoms are the same as mine only worse, so I think you are on the right track, but maybe his jumped timing worse than mine did...?

    Bad tensioner maybe (even though it's new, could be defective). I didn't see mention of a new water pump....leaking water pumps have been known to help 5VZs jump timing...so has driving threw water deep enough to cover the lower part of the timing belt area.
     
  4. Apr 21, 2020 at 7:53 AM
    #4
    Lovetrucks

    Lovetrucks Member

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    I had 2 Fords with the symptoms you’re describing , 1 was a vacuum leak and the other was the carburetor which in your case would be the throttle body .
     
  5. Apr 21, 2020 at 7:56 AM
    #5
    Rex Kramer

    Rex Kramer Vinyl Spinner

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    Did you clean the throttle body?

    Are the cats clogged up?
     
  6. Apr 21, 2020 at 9:22 AM
    #6
    tundratim

    tundratim New Member

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    mass air flow sensor will create all these problems and not throw a code
     
    Jonah H[OP] likes this.
  7. Apr 21, 2020 at 9:33 AM
    #7
    Rex Kramer

    Rex Kramer Vinyl Spinner

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    Yes, that would be the first thing to check but he said it's new.
    Maybe it's not an OEM Toyota MAF?
     
    Jonah H[OP] and TX-TRD1stGEN like this.
  8. Apr 30, 2020 at 7:55 PM
    #8
    Jonah H

    Jonah H [OP] New Member

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    2002 Tundra 3.4L 5-sp
    2" Suspension lift, 2004 Facelift, Bilstein 5100, Locker, Hellwig leaf kit
    Thanks everyone for the replies. I just got around to tearing down to the timing belt. It’s been a year since I replaced it (and yes- I did the tensioners, pulleys and water pump) and everything is still in time with each other. The crankshaft timing pulley isn’t stripped out like I thought.

    FAFB8DFA-DFD4-4AF9-A8F6-80EFD11B6E86.jpg BE363F49-5F92-4799-9ED8-3C94B8B430E0.jpg

    Everything seems normal but when I drove it this week, it developed a hard bucking when I let off the gas/engaged the clutch.

    I did notice the MAF is an off-brand that’s not DENSO, so I purchased the OEM brand and now I’m waiting for it to get here though the mail. (I’m in Guam so things take weeks to get here).

    In the meantime I’ll check the cats and vacuum for leaks. Much appreciated!
     
  9. Apr 30, 2020 at 8:14 PM
    #9
    55kcement

    55kcement New Member

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    Check the air intake pipe for cracks or leaks after the mass air flow sensor between it and the throttle body . It will cause strange issues if it’s cracked . my land cruiser did something similar and the tube was broken at the bottom side of the flexible section and you couldn’t see it . Extra air that’s not registered by the mass air flow can cause strange issues .
     
    Tundra2 likes this.
  10. Apr 30, 2020 at 8:17 PM
    #10
    55kcement

    55kcement New Member

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    I also had an issue with water getting into the O2 sensor connector , cause s a strange problem also both caused not codes or engine light .
     
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  11. May 1, 2020 at 6:16 PM
    #11
    Jonah H

    Jonah H [OP] New Member

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    2" Suspension lift, 2004 Facelift, Bilstein 5100, Locker, Hellwig leaf kit
    Okay- I keep digging to try and solve the issue and I noticed something else. When I shut my truck down, there is a loud hissing for about 5 seconds under the hood. It sounds like a vacuum leak originating from the brake booster (The evap canister is fine with brand new lines). It seems to come from under the booster, but I can’t find or feel the leak but it’s super audible. There’s no issue with my brakes at all, so my question is: Would a brake booster vacuum leak effect the idle speed or engine performance? And has anyone had similar issues with bad boosters or vacuum leaks in that area?
     
  12. May 1, 2020 at 6:18 PM
    #12
    jeremyd

    jeremyd 2014 Crewmax SR5

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    I would suggest a smoke test, Leaks can be hard to find..

    You can probably find a shop to just hookup the smoker and tell you where the leak is to keep the cost minimum. Hope that helps. We still have a 3.4 liter in the family so I'm watching this thread..
     
    Jonah H[OP] likes this.
  13. May 15, 2020 at 5:36 PM
    #13
    Jonah H

    Jonah H [OP] New Member

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    2002 Tundra 3.4L 5-sp
    2" Suspension lift, 2004 Facelift, Bilstein 5100, Locker, Hellwig leaf kit
    Alright, I know it’s been a while but the parts came in the other day and I was able to figure it out. The check valve on the brake booster was leaking real bad, one of the vacuum lines leading to the intake was leaking. I also replaced the MAF sensor again, this time with the manufacturer spec Denso unit. I resealed the vacuum check valve with RTV and replaced the cracked vacuum hose- which helped significantly but didn’t fix the issue 100%. Once I installed the Denso MAF, it ran perfectly. I’m not sure what the difference between the new MAFs were, but maybe the no-name brand unit was bad from the start. The Tundra runs and drives amazingly now and it’s got more power than I’ve ever experienced before out of the 3.4L.

    0013BD79-E022-4B45-A442-5D05D03CCFC5.jpg
    5DC552DD-152D-4025-B814-79AD07D27C3B.jpg

    Here’s a photo of the unit and the check valve in case anyone isn’t familiar with what I’m referring to.

    -Side note: I also replaced the camshaft plugs to stop an oil leak, and did the deck plate mod on the air box while I waited for the parts in the mail.
    (More on those by request)
     

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