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high rpm stumble

Discussion in '1st Gen. Tacomas (1995-2004)' started by Ryanp, Feb 27, 2012.

  1. Feb 27, 2012 at 6:22 PM
    #1
    Ryanp

    Ryanp [OP] Member

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    hey hows it going im having a strange issue with my tacoma its an 01 3.4 5spd
    the problem happens when im at full throttle in second gear and up it will run fine until 4 grand then it feels like a rev limiter is kicking in and it stumbles and falls on its face if i do the same thing at like 3/4 throttle its fine. so far ive done the plugs and the tps and now im kinda stumped. any help is greatly appreciated
     
  2. Feb 28, 2012 at 1:13 PM
    #2
    Ryanp

    Ryanp [OP] Member

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    TTT...
     
  3. Feb 28, 2012 at 1:31 PM
    #3
    derekp

    derekp giddy up!

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    Have you cleaned the MAF sensor? My 2000 3.4 had an issue similar to this, although not at RPMs that high.
     
  4. Feb 28, 2012 at 1:51 PM
    #4
    Ryanp

    Ryanp [OP] Member

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    Yeah I've checked and cleaned it
     
  5. Feb 29, 2012 at 2:59 PM
    #5
    Ryanp

    Ryanp [OP] Member

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    Anyone else have anymore ideas
     
  6. Feb 29, 2012 at 3:04 PM
    #6
    BrokenTusk

    BrokenTusk I support a velociraptor free workplace.

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    Marcelasaurus
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    Your having a stumble at WOT? (Wide open throttle)

    Sounds live a fuel delivery issue, could be a number of things, check around anywhere for any fuel leaks (It's easy to smell gas) Or your fuel filter itself might be clogged, how many kilometres are on the vehicle??

    Also, I'm not positive on 1st gens, hopefully one of our 1st gen pros can chime in
     
  7. Feb 29, 2012 at 4:07 PM
    #7
    hossmaster

    hossmaster Well-Known Member

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    Could be the Air Fuel Ratio Sensor going south, but not enough to throw a code. Is your tailpipe sooty?
     
  8. Feb 29, 2012 at 4:27 PM
    #8
    Wild Card

    Wild Card Truck yeah!

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    Ignition system can also be a culprit. How are your plugs and wires looking?
     
  9. Feb 29, 2012 at 8:41 PM
    #9
    Ryanp

    Ryanp [OP] Member

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    the trucks got 295,000km (183,000miles). ive changed the fuel filter, and ive checked the resistance of the coils and they check out, im gonna pull the a/f sensor if i can get the time tomorrow and check it out.
     
  10. Mar 1, 2012 at 6:06 AM
    #10
    Wild Card

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    Resistance of the coils isn't what I'm worried about. I'm worried about high-voltage arcing from your wires to your block/intake when the RPM's are up. Therefore, the engine stutters, as the sparks lose their power source. Wires do get small, microscopic cracks in them after so many years and heat cycles...
     
  11. Mar 1, 2012 at 7:44 AM
    #11
    Ryanp

    Ryanp [OP] Member

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    On the way to work this morning I noticed that now there's a couple new symptoms to this it started bucking under slight acceleration once in a while not just at wot anymore and my idle has shot up to about 1500 rpm. Could it be the Iac sticking open.
     
  12. Mar 1, 2012 at 9:58 AM
    #12
    skytower

    skytower Well-Known Member

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    WIRES. To confirm this: In the dark, with the engine running, spray a light mist of water on the wires, look for arcs.
    You should also be able to find fine grey lines of dusty looking deposits on the wires. This is where the arcs are travelling.
    IMO, you wated money on the TPS by not checking/replacing the most common source of ignition problems, the wires. Start with the cheap stuff and work your way up to the more expensive stuff. Troubleshooting the problem instead of throwing parts at it will save you money too.
     
  13. Mar 2, 2012 at 6:07 PM
    #13
    Ryanp

    Ryanp [OP] Member

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    well skytowers test showed no results there was no arcing or anything. even so i ended up changing spark plug wires since they are a maintnence item and may of helped fix the problem but they didn't, so now i really dont know where to look next.
     
  14. Mar 2, 2012 at 7:09 PM
    #14
    skytower

    skytower Well-Known Member

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    Check for vaccum leaks, pull the egr and clean/look for carbon deposits, clean the iac. Check all the electrical connenctions, and engine grounds for corrosion. Does your engine have coil on plug? Check the boots for cracks and arc marks.
    The low speed stuble sounds like iac or egr.
     
  15. Mar 3, 2012 at 1:01 AM
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    Ryanp

    Ryanp [OP] Member

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    yeah its coil on plug the boots are in great shape, ive checked for vac leaks. tomorrow i'll try to get around to checking all the grounds again and then try cleaning out the iac. im pretty sure my truck doesnt have an egr cause i cant seem to find it.
     
  16. Mar 3, 2012 at 7:04 AM
    #16
    skytower

    skytower Well-Known Member

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    All of my concerns about plug wires were misguided. You don't have any. The boots have the same problem as plug wires. Unfortunately, you can't do the spray test on them. You might be able to see arc marks on them, but with 185k on them, and a misfire problem, i'd replace the boots.
    Ignition problems don't always set a code, but fuel/air delivery problems usually do. I'm back to looking at no spark again.
     
  17. Mar 3, 2012 at 7:08 AM
    #17
    skytower

    skytower Well-Known Member

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    The comment from the op about the rev limiter like power drop is what has me stuck on spark loss. That's a very specific feel/sound. Fuel injectors, egr, iac, problems don't act like that.
     
  18. Mar 8, 2012 at 9:25 AM
    #18
    Ryanp

    Ryanp [OP] Member

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    First off hanks to everyone for all the help so far.

    Ok so now an update, I pulled the throttle body off took of the iac and cleaned the hell out of everything. Put it all back together and it's gotten rid of the rev limiter feeling at 4k rpm which is great. But it's still I idling at 1500 rpm which is much better than 2000 but not right yet, it also likes to stumble under light acceleration once and a while.
     
  19. Mar 8, 2012 at 9:37 AM
    #19
    skytower

    skytower Well-Known Member

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    If there was no change when you cleaned the IAC, I'd say keep looking. Now you know what the problem is. Replace the IAC.
     
  20. Mar 9, 2012 at 6:08 PM
    #20
    Ryanp

    Ryanp [OP] Member

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    so turns out when i cleaned the iac it fixed the problem.but it was masked by the fact that i had purchased a faulty tps sensor now that thats been swapped for a god one the truck is now running great.
     
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