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Rough Idle and under load at certain speeds.

Discussion in '1st Gen. Tacomas (1995-2004)' started by the sQuirrel, Jul 30, 2015.

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  1. Jul 30, 2015 at 7:31 PM
    #1
    the sQuirrel

    #1
    the sQuirrel [OP] Active Member

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    '99 Taco Limited TRD
    1999 V6 Toyota Tacoma 3.4
    294,681 miles

    -New wires and Plugs, with Coils
    -New Fuel Filter
    -Oil good
    -Timing Belt is good
    -Air Filter good

    up til 3 weeks ago, my truck ran great.
    one day in traffic it started shaking real bad. (felt like misfiring)
    -day was super hot and stop and go traffic
    did tune up, and the idle is NOT as bad but still present.

    Shop said, random misfire. need to inspect more.
    -I can't keep throwing parts on their guessing. Any suggestions? As I took over the job and changed out the Ignition Coils myself (learned from YouTube)

    CEL come on spurratically at certain RPM's and usually up hill when it gets rough

    Idle is not as rough but still present.

    please help, I've read thru a lot of threads and that's where I got the idea to replace my Fuel Filter. lol, yea... after I gassed up too. (rookie move)
     
    Last edited: Jul 30, 2015
    the sQuirrel, Jul 30, 2015
    #1
  2. Jul 30, 2015 at 8:17 PM
    #2
    akuma1975

    #2
    akuma1975 Well-Known Member

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    After a good drive check the brakes. See how hot they are .You might be rubbing . If you have no check engine light . Mine was super hot . And I change the master cylinder. And re greased the bolts . My problem was fixed.
     
    akuma1975, Jul 30, 2015
    #2
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  3. Jul 30, 2015 at 8:59 PM
    #3
    the sQuirrel

    #3
    the sQuirrel [OP] Active Member

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    lol, thanks but i believe that's an answer for someone else
     
    the sQuirrel, Jul 30, 2015
    #3
  4. Jul 30, 2015 at 9:08 PM
    #4
    Steves104x4

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    Steves104x4 Well-Known Member

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    BUCKLE UP! It makes it harder for Aliens to pull you out of your Truck.
    I dunno maybe try a new engine coolant temp sensor first then maybe try and find a lower mileage ignition control module but I could (and probably am) waaay wrong.
     
    Steves104x4, Jul 30, 2015
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  5. Jul 30, 2015 at 9:11 PM
    #5
    akuma1975

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    akuma1975 Well-Known Member

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    No really I have a few cars that had bad master cylinder a Honda that brake pedal would sink to the floor. Or the Eclipse that would leak inside the car . Now it brings me to the Tacoma I have thrown just as much as you have I even put a fuel pump in . But I took off my front wheel and had my girlfriend hit the brakes and it would not release . That's when I starting to look at the back and the front. I bought a master cylinder my problem was fixed .
     
    akuma1975, Jul 30, 2015
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  6. Jul 30, 2015 at 9:16 PM
    #6
    akuma1975

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    akuma1975 Well-Known Member

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    Did you clean the maf also ?
     
    akuma1975, Jul 30, 2015
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  7. Jul 30, 2015 at 11:22 PM
    #7
    the sQuirrel

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    the sQuirrel [OP] Active Member

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    akuma: I will check the Brakes. i'M willing to investigate.
    also, define: MAF please.

    steve: thaNks for ur input.

    brainstorming is why I aM here
     
    the sQuirrel, Jul 30, 2015
    #7
  8. Jul 31, 2015 at 12:10 AM
    #8
    the sQuirrel

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    the sQuirrel [OP] Active Member

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    MAF: MassAirflow

    thaNks! i'M on it in the morning
     
    the sQuirrel, Jul 31, 2015
    #8
  9. Jul 31, 2015 at 2:46 PM
    #9
    the sQuirrel

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    the sQuirrel [OP] Active Member

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    MAF clean and it runs smoother but lite still comes on under load at certain RPMs.

    I'm now leaning towards a vacuum leak.

    usually I take to the mechanic. however times are time right now so here I am.

    CEL is not always on and idle feels a bit ruff. I'm stumped.
    I'm in the East Bay, California area if anyone wants to troubleshoot with me for delivered pizza and beer. (just pretend we are neighbors) I can drive to you.
     
    the sQuirrel, Jul 31, 2015
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  10. Jul 31, 2015 at 2:52 PM
    #10
    Taco me elmo

    #10
    Taco me elmo Here, Eat some paint. Drink some Bleach.

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    How old are your upstream and downstream O2 sensors?
     
    Taco me elmo, Jul 31, 2015
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  11. Jul 31, 2015 at 4:22 PM
    #11
    the sQuirrel

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    the sQuirrel [OP] Active Member

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    hMmm... good question. I'll research them now as I really don't know what they are. thanks:)

    a code of random misfiring was given when the shop did a computer readout.

    would these trigger a code specifically?
     
    the sQuirrel, Jul 31, 2015
    #11
  12. Aug 1, 2015 at 9:34 PM
    #12
    the sQuirrel

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    the sQuirrel [OP] Active Member

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    misfire: cyl 1... now I'm thinking injector?

    how is one to kno, without throwing parts at the damn truck:-/

    troubleshooting gets expensive:(
     
    the sQuirrel, Aug 1, 2015
    #12
  13. Aug 1, 2015 at 10:12 PM
    #13
    CodeSeven

    #13
    CodeSeven LOC: 33.781461, -115.867251

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    there's too many issues that could cause this. your cam/crank sensors could have broken off inside for all we know. but because they still read, they could still "missfire" and cause the truck to run semi properly.

    in the mean time run some chevron gas or gas with techron additive. maybe some high octane. ALSO, full or empty tank of gas makes NOT difference in changing the fuel filter. don't worry. just wear safety glasses as there is pressure built up and it can get in your eye.

    double check the plugs, wires, and coils. something may have slipped since they were installed. did you get the right plugs? are they double electrode at least? was a plug not properly tightened and did the combustion cause pressure to slip by and pop a coil/boot out of place (very unlikely, im being silly)?
     
    CodeSeven, Aug 1, 2015
    #13
  14. Aug 1, 2015 at 10:16 PM
    #14
    CodeSeven

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    CodeSeven LOC: 33.781461, -115.867251

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    MAKE SURE THE WIRES AREN'T TOUCHING ANYTHING THAT'S GROUNDED! after a recent flood from a storm, i drove my truck around town and through some deep puddles. after getting out of them my truck ran like crap and i could hear ticking from the engine. the wires were shorting out on something. ran fine minutes later after it dried. still runs perfectly fine couple weeks later btw

    also, im assuming that your CEL only comes on rarely and showing a misfire on cyl 1. right?
     
    CodeSeven, Aug 1, 2015
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  15. Aug 1, 2015 at 10:36 PM
    #15
    the sQuirrel

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    the sQuirrel [OP] Active Member

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    yes. misfire happens when uphill or at idle.

    the sweet spot seems to be 68 and runs smooth.

    anything else is rough.

    I APPRECIATE ALL THE INPUT:)

    yes, I checked all wires, plugs and Coil Packs.

    no vacuum leaks found.
     
    the sQuirrel, Aug 1, 2015
    #15
  16. Aug 1, 2015 at 10:39 PM
    #16
    the sQuirrel

    #16
    the sQuirrel [OP] Active Member

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    I was reading I can place a long screw driver onto the base of the injector to "hear" constant clicking... and to compare with others to see if it is at least working.

    What I should've disclosed FIRST is I used a Seafoam Additive prior ALL THIS MESS:(

    I'm wondering if it clogged my injector on Cyl 1
    I used it because my buddy did on a similar truck and it worked wonders he said.

    I'm here because I am running out of money and I need to pass smog for my past due registration:(
     
    the sQuirrel, Aug 1, 2015
    #16
  17. Aug 1, 2015 at 11:06 PM
    #17
    Caligula

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    Caligula Well-Known Member

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    Youre throwing parts at the truck, but you have not even determined why the CEL is on? o_O
     
    Caligula, Aug 1, 2015
    #17
  18. Aug 1, 2015 at 11:14 PM
    #18
    the sQuirrel

    #18
    the sQuirrel [OP] Active Member

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    misfire led me to believe sparks/ wires and coils. so I eliminated them as the culprit...

    needed a tune up anyway and threw in the fuel filter as a bonus.

    when all said and done, the Cyl1 is still misfiring. leading me to believe it's the injector corresponding to cyl1.

    yes... I. starting to feel that I'm throwing parts because if the misfire still exists, then the Coils DIDNT need to be included in the turn up and I just wasted 300 bucks:-/
     
    the sQuirrel, Aug 1, 2015
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  19. Aug 1, 2015 at 11:16 PM
    #19
    the sQuirrel

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    the sQuirrel [OP] Active Member

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    yes, this is what I get for DIY to TRY and save money by going to a mechanic.
     
    the sQuirrel, Aug 1, 2015
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  20. Aug 1, 2015 at 11:40 PM
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    Caligula

    #20
    Caligula Well-Known Member

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    How do you know cylinder 1 is misfiring. Do you know what codes are stored.
     
    Caligula, Aug 1, 2015
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