Question about 2001 Toyota Tacoma

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99 4runner po302 code

Today i changed back to original plug wires and switched coil pack 1 to 3....i cleared all codes drove to the store with scan tool hooked up...ran fine to store no codes... when i came out and started it, i noticed it was stumbling again, it tru only one code this time po302....i believe the wires i put in were bad or i mixed up cylinders..i think this because i have the original code i started with before changing wires....could it still be the coil pack as to it is showing a code for only one cylinder and the coil connects 2-5 cylinder? im at a lose at the moment and back at ground zero....any advice would be great...thanks

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  • 25 more comments 
  • kosmindtrip Dec 28, 2008

    really, the code stayed the same...wouldnt it move with the move of the coil? i hope its the coil...would an ohms test help before changing out? to see if its within specs?

  • kosmindtrip Dec 29, 2008

    i dont think its the coil...wouldnt it throw 2 codes because the coil fires 2 cylinders at once? im thinking its the injector...is there any way to test the injectors on 2,4,6 cylinders without taking off the plenum? thanks

  • kosmindtrip Dec 29, 2008

    should i check fuel pressure as well?

  • kosmindtrip Dec 29, 2008

    well im at a rock and a hard place at the moment...no cash,none i do have time though...is there a way to test the injectors without taking off the plenum???auto stores want from 35$-120 for a compression test kit...i do have a noid light and an ohms meter...

    what gaskets would need to be replaced when taking off the plenum to get at the injectors if need be?

  • kosmindtrip Dec 29, 2008

    ok sounds like im going to take off the plenum,

    so once i get the plenum off and get to the injectors.how do i test for resistance with engine cranked or key off?? i know i check with noid with key on..right???

  • kosmindtrip Dec 30, 2008

    tested 2,4,6 injectors they were way low 2-60psi,4-65psi,6-75psi...looked like oil leak starting at 2 cylinder...odd side cylinders were like 190psi -200psi...blown head gasket?

  • kosmindtrip Dec 30, 2008

    correction,i ment valve cover leak....not head gasket...would that cause misfire and low compression?

  • kosmindtrip Dec 30, 2008

    i was very supprised to see the compression so low im going to recheck it later today.. could have did somthing wrong as to we didnt have the manual handy...but it for sure looks like the valve cover is leaking starting at the # 2 cylinder...it has never overheated stays at midrange as far as heat goes...coolant level is good,not getting anything weird coming out of the exhaust...

  • kosmindtrip Dec 30, 2008

    im waiting for my buddy to get home so i can do a compression test...the leak looks like it starts at cylinder 2 under oil fill cap....valve jobs are pretty expensive arent they....would it be any cheaper if i took off the head and took it in for theim to adjust the valves? anothether question should i get both heads done at the same time or can i get away with just doing the bad valves if that turns out to be the problem...tonight plan on doing a leak down test as well to get a definitive answer on if its the valves or rings or whatever?

  • kosmindtrip Dec 30, 2008

    just got a new code p1300 igniter circuit mafunction no.1

    i thought the igniter was in the coil packhttp://www.parksoffroad.com/tacomamods/m...

  • kosmindtrip Dec 31, 2008

    i was thinking the same thing about the compression...im going to rent one from the auto parts store...im going to try to test all the injector voltage at the ecm...should that test let me know if the injector is bad if the voltage varies from the others?

    im not sure why i got the igniter code? wouldnt run if it were bad...im going to reset the ecm an see if it comes back...off to test..

  • kosmindtrip Jan 01, 2009

    today i got a stethoscope..i listened to all the injectors all were clicking quite well exept the # 2 cylinder..i could just hear the enging running no click...im thinking its the injector? taking off the plenum shouldnt be too bad...is the none clicking an indication of the injector not working?

  • kosmindtrip Jan 02, 2009

    i cannot get to the injector with a noid light,can barley get to it with the long stethescope...maybe i can clip an extension on the noid to reach the injector...the injector clicks when cold but warm does not click?

  • kosmindtrip Jan 02, 2009

    i cannot get to the injector with a noid light,can barley get to it with the long stethescope...maybe i can clip an extension on the noid to reach the injector...the injector clicks when cold but warm does not click?

  • kosmindtrip Jan 02, 2009

    i just bought a used working injector 25$ going to tear down intake sat hopefully...ill keep you you updated...should i get any other gasket besides the plenum gasket?

  • kosmindtrip Jan 02, 2009

    lube with gas or just a dab of grease.?..im tracking a plenum gasket down now...

  • kosmindtrip Jan 02, 2009

    roger that vaseline...i have a gasket on order 27.00$ will be at store in a couple of hours...too bad my digi camera batterys are dead...would like to take pics to document all steps taking out the plenum...i plan to use masking tape and number each side of each part that is taken out..so hopefully can have a quick assembly...any tips would be great?thanks

  • kosmindtrip Jan 02, 2009

    i hope it runs great too...ive been testing and testing,i see now why the techs get paid the money they do....though thru the process ive been diagnosed with crohns disease and reacently got out of the hospital from being infected with samonilla...still have the iv in my arm and have to inject antibiotics every day,,so ive had to work on the truck whenever ive felt good, so its taken twice as long...i appreciate all your help...im sure ill need more...

    they wanted 500$ just to test and put in one injector...

  • kosmindtrip Jan 02, 2009

    i hope it runs great too...ive been testing and testing,i see now why the techs get paid the money they do....though thru the process ive been diagnosed with crohns disease and reacently got out of the hospital from being infected with samonilla...still have the iv in my arm and have to inject antibiotics every day,,so ive had to work on the truck whenever ive felt good, so its taken twice as long...i appreciate all your help...im sure ill need more...

    they wanted 500$ just to test and put in one injector...

  • Toyota Ed May 11, 2010

    If the igniter was bad, the vehicle would not start.



    Valve jobs ARE expensive.



    You cannot "adjust" the valves; the valve clearances are set by choosing and inserting different thicknesses of valve shims.



    You need definite compression results before you start ripping the heads off.

  • Toyota Ed May 11, 2010

    WIth compression readings as you posted, the vehicle would hardly run. If the readings are true (and I seriously doubt it), you may have a deteriorated cylinder head gasket, at #4 cylinder area.

    Again, you would not just fire a P-0302 with a head gasket issue. If you moved the coils, and the misfire did not change, you may have a burnt valve, or a chipped valve, whatever, which would def give you a #2 cyl misfire. I hesitate to pronounce the injector bad without a good compression reading.

  • Toyota Ed May 11, 2010

    I would be leaning to head gasket, but I tend to think not, you mention no overheats. I am guessing valve issues. Those compressions are way too low, and you should have p0302 0304 0306 with those readings.....

  • Toyota Ed May 11, 2010

    The noid light will tell you if the injector is getting a pulse, but it will not tell you if the injector is firing. Check the resistance of the injector and get back to me. You are goit to need the plenum gasket at the least.

  • Toyota Ed May 11, 2010

    fuel pressure is not important

  • Toyota Ed May 11, 2010

    Before you start pulling the plenum, get the compressions checked on cyls 2-4-6. Don't bother with 1-3-5...Then get back to me.

  • Toyota Ed May 11, 2010

    The coil pack is the culprit, replace it and the wire.

  • Anonymous Mar 24, 2014

    I have replaced the wires, plugs and a coil pack and the code p0305 come back

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  • Toyota Master
  • 1,861 Answers

Yes. No clicking indicates a bad injector; you mentioned you had a Noid light; does it pulse?

If you remove the plenum to replace the injector, buy new plenum gaskets. You should not reuse them.

The graciousness of a FixYa rating for my assistance would be appreciated.

Posted on Jan 02, 2009

  • 2 more comments 
  • Toyota Ed Jan 02, 2009

    It should click 100% of the time. Looks like you need an injector.

  • Toyota Ed Jan 02, 2009

    No other stuff, just make sure that you lube the o-ring before you insert the new injector into the head.

  • Toyota Ed Jan 02, 2009

    Lube it with vaseline. Not oil, not gas.

  • Toyota Ed Jan 02, 2009

    Just make sure that you don't mix up the plenum bolts. I think a couple may be longer than the others, I forget right now. You will be fine. I wish you the best of luck. Looking forward to hearing that it runs great.

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modelgirl
  • 7 Answers

SOURCE: 99 4runner 3.4

Ok this is sort of where I started with same problem, which at moment is not solved. You are on the right track as I also just changed my wires, although the readings from wires were ok, We also tried the coil & igniter which is simple to put in as connected by plug ins, I will warn you as I went to a Toyota parts yard $50. and they made the mistake of cutting one of the wires, to which my mechanic had to weld it together. It is held on by two bolts and plug ins so there is no need to cut! I was not getting power to cylinder 2. Thats when I can tell you that my back yard mechanic put in the injector, just to give you an indication in Vancouver, Canada it was $75. then 1hr to put in. It is a little tricky to install, and watch out for the vacuum hose for the fuel regulater as my mechanic didn't tighten it and it came loose! I have gone through a succession of things, latest being A new Coolant Temp Sensor which sends signals to fuel compression etc. It's tempermental in missing and running ruff. I am on here to try and get solutions before I take it to Toyota....arg

Posted on Jan 17, 2009

6ya6ya
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Posted on Jan 02, 2017

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