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Hesitating and Missing but computer says not misfiring

Discussion in '1st Gen Tundras (2000-2006)' started by cardiac, Feb 25, 2021.

  1. Feb 25, 2021 at 3:15 PM
    #1
    cardiac

    cardiac [OP] New Member

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    So this started a few weeks ago on my 2003 V6 250K.
    When I put my foot down, even slightly in normal driving, like pulling away from lights it's missing like crazy. If I just touch the pedal and be really gentle it's OK.
    My friend put his computer on it and it's not showing any issues at all. It feels like a coil and when it's stone cold it doesn't happen which makes me think it's a coil but he knows what he is doing on the computer and it shows nothing at all. BTW I changed the MAS just incase and that made no difference. Any ideas?
     
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  2. Feb 25, 2021 at 3:24 PM
    #2
    Tundra2

    Tundra2 Zoinked

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    Did you use the correct Denso MAF?

    I ordered mine from Densoproducts.com
    Website part number (SKU) 197-6020

    Denso MAF Sensor 22204-21010

    Could be a grounding issue also. I'm not sure if that would trigger a Check engine light. (CEL)

    Check battery connections too to eliminate easy stuff.

    Could also be spark plugs I suppose.

    Here's a link to the ones I used in my V6.
    Link.

    Any other work done recently?

    Here is a link to a download able version of the service manual.

    You can use this to help troubleshoot.
     
    Last edited: Feb 25, 2021
  3. Feb 25, 2021 at 3:29 PM
    #3
    Rex Kramer

    Rex Kramer Vinyl Spinner

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    Tundra2 likes this.
  4. Feb 25, 2021 at 4:33 PM
    #4
    cardiac

    cardiac [OP] New Member

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    Thanks for the replies, plugs were changed a while back.
    I personally did the valve cover gaskets about 3 or 4 months ago using all Toyota parts as it was weeping a bit of oil.
    I'll check the battery and ground in the morning. Alternator was changed about a year ago.
    One other thing I did notice recently is the charging indicator in the dash is sitting 3/4-7/8 way up to the top line. I don't remember it ever sitting that high before.
    BTW I have owned this since 2004 and it was Toyota serviced up until about 2 years ago (I had free tires for life deal when I bought the truck - boy did they get pissed every time it needed tires he he)
    Maybe Ill just throw a set of coils and wires on it to see if that helps, it's just weird the computer didn't show anything. Maybe he didn't know what he was doing!!!
    I am a British bike enthusiast and I know from decades of experience when failing coils or magnetos are cold they can function well but as they heat up they start messing up and that's what this feels like. After about 2 miles this issue starts.
     
  5. Feb 25, 2021 at 4:42 PM
    #5
    cardiac

    cardiac [OP] New Member

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    There a 3 pack of Drivestar coils on Amazon for $39 are they worth a try or just pure garbage?
     
  6. Feb 25, 2021 at 5:29 PM
    #6
    Tundra2

    Tundra2 Zoinked

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    I bought Denso coils from Amazon back in July. I changed my OEM coils to these densos back then around 316K miles.

    Here's a product link.
    Link.


    About the coil wires, I got frustrated during my searching. I couldn't find who made them for toyota. I ordered genuine toy oem wires from Amazon.

    Link.

    In hindsight, it was great that I ordered the OEM wires because they came with the little clips, and wire separators. I didn't have to reuse anything, and it was no muss or fuss. Ease of install.
     
  7. Feb 25, 2021 at 6:09 PM
    #7
    Pucks18

    Pucks18 Fleabit peanut monkey

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    I had a similar issue once when I first got my truck. Turned out to be a dirty ass air filter. Phew
     
  8. Feb 25, 2021 at 7:06 PM
    #8
    assassin10000

    assassin10000 New Member

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    If the voltage is that high is it measure 15-16v or more? Ecu could be shutting off to save itself.

    This would be a bad alternator.
     
  9. Feb 25, 2021 at 7:39 PM
    #9
    Filthyphil

    Filthyphil Lions Not Sheep

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    Intake gasket possibly, my truck would idle fine at cold then miss and sound like shit once warm. Took until it got really bad before it threw a code.
     
  10. Feb 25, 2021 at 7:56 PM
    #10
    cardiac

    cardiac [OP] New Member

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    Wondering could it be that, I had all that off when doing the valve covers a few months back but I did use new Toyota gaskets and torqued the bolts evenly. On the bikes we would drench the intake joint with WD40 to see if the revs changed and that would indicate a leak but sure you can't get near it on one side on this motor. Maybe it's something to try though. Thanks for the info.
     
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  11. Feb 25, 2021 at 7:57 PM
    #11
    MS22

    MS22 New Member

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    I had the exact same issues that you described on my 02 except it's a V8. Turned out to be a bad ignition coil.
     
  12. Feb 27, 2021 at 7:48 AM
    #12
    cardiac

    cardiac [OP] New Member

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    Well I found the culprit this morning thankfully. One plug has split the porcelain.
    I guess the computers don't know where the spark was going and are just happy that it's sparking somewhere :)
     
  13. Feb 27, 2021 at 8:01 AM
    #13
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    How many miles on these plugs and what brand? I read above you said you replaced them ‘a while back’. Glad you figured out the problem. Hope you put in some nice Denso or NGK.
     
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  14. Feb 27, 2021 at 9:27 AM
    #14
    Filthyphil

    Filthyphil Lions Not Sheep

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    Nice!! Quick east cheap fix that’s what we like brother! And like Hand Model said go to Toyota and spend the $2 a plug for oem.
     
  15. Feb 27, 2021 at 9:31 AM
    #15
    Pucks18

    Pucks18 Fleabit peanut monkey

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    Glad to hear it was a non serious issue
     
  16. Feb 27, 2021 at 10:04 AM
    #16
    cardiac

    cardiac [OP] New Member

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    Thanks for all the pointers guys, are forums just the best thing. A world of knowledge.
    I have another issue with the sway bar but I will start a new thread for it.
     
  17. Feb 27, 2021 at 10:10 AM
    #17
    Jack McCarthy

    Jack McCarthy Truck repair enthusiast; Rust Aficionado

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    Hopefully it’s a defect and not caused by something that a bigger problem.
     

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