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taco will not run please help

Discussion in '4 Cylinder' started by dooredtaco, Mar 29, 2012.

  1. Mar 29, 2012 at 10:05 AM
    #1
    dooredtaco

    dooredtaco [OP] Well-Known Member

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    hi ok everybody first i will tell you what all i have replaced in the past month:
    spark plugs and wires from the factory, mobile1 high mile full syn. oil with factory oil filter, PCV valve, front o2 sensor, fuel pump, fuel filter, ran seafoam through the vac. line

    a few days ago the truck ran hot and was running bad so i seen that it was my alternater belt pretty much had no teeth/groves anymore and figured that was why the truck overheated cause the water pump wasnt being able to spin right so i fixed that and it fixed the overheating but truck was running like crap then two days after that truck broke down so now i have tried another fuel pump- no results, i have swapped the fuel rail and injectors from my other truck but still no results. i have good compression 160 psi on each cylinder i have cheaked for spark with a screw driver sticking out of the end of wire but had good spark. all fusses are good. oil still looks great and coolent looks great.

    ok so here is what the truck is doing after sitting for a long time truck will start and run very bad and die when put into gear. then it wont start back up and it just soakes down the spark plugs and the crazy part is i can unplug the MAF sensor and the truck will crank back up and idle perfect and rev up perfect but
    will spit and sputter if try to drive it over 2000 RPM (still while having MAF unplugged) and then as soon as try to plug MAF back in truck will instantly die. WTF


    i have cleaned the MAF- no result and i have checked with starter fluid many times and cant find any vacume leaks. there are five wires that go to the MAF harness and 4 out of the 5 ohm out with the ground and the one that doesnt is the gray with red strip wire.
    thanks for any help i am about to go crazy here
    also the truck is a 98 2.4L auto
    __________________
     
  2. Mar 29, 2012 at 10:05 AM
    #2
    dooredtaco

    dooredtaco [OP] Well-Known Member

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    also could it have jumped timing from the belt not grabbing the pulley?
     
  3. Mar 29, 2012 at 10:11 AM
    #3
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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    You have a chain and they typically won't jump teeth unless they are damaged. You showing any codes?
     
  4. Mar 29, 2012 at 10:11 AM
    #4
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    FlimFlubberJAM
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    You dont have a timming belt. It has a chain. So the likelyhood of it jumping a tooth or so is unlikely. What engine codes are you throwing?
     
  5. Mar 29, 2012 at 10:17 AM
    #5
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    Mere seconds Ben.....mere seconds.....:cool:
     
  6. Mar 29, 2012 at 10:18 AM
    #6
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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    Still quicker............:cool:
     
  7. Mar 29, 2012 at 10:28 AM
    #7
    dooredtaco

    dooredtaco [OP] Well-Known Member

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    yeah i thought that was not very likley to happen to a chain also but hey i just been trying to think of any possible thing it could be. on the codes dont have any as of now cause i cleared them and can only get it to run with the MAF unplugged so of course then it popped up the MAF malfuntion codes and a TPS malfuntion code but when i had it running the night before last with the MAF plugged in it only had the system bank 1 running too lean codes which has been popping up the whole time i have ever had this truck (over a year)
     
  8. Mar 29, 2012 at 10:31 AM
    #8
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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    You should stop unplugging the MAF. You can damage it and or blow the EFI fuse. I would suggest looking at the EFI fuse right now.
     
  9. Mar 29, 2012 at 10:35 AM
    #9
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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    Here's the basic list to look at regarding that code, which I assume is a P0171.

    It sounds like you're not getting enough gas.

     Air induction system
     Injector blockage
     Mass air flow meter
     Engine coolant temp. sensor
     Fuel pressure
     Gas leakage in exhaust system
     Open or short in A/F sensor (bank 1 sensor 1) circuit
     A/F sensor (bank 1 sensor 1)
     PCV valve and hose
     PCV hose connection
     EFI main relay
     A/F sensor heater and relay circuit

    But what troubles me is that it was overheating. Have you pulled the plugs and inspected them since it over heated?
     
  10. Mar 29, 2012 at 10:43 AM
    #10
    dooredtaco

    dooredtaco [OP] Well-Known Member

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    yes i have looked at plugs there new but you know from getting soaked from trying to crank so i have cleaned them best i could and gonna get new ones o nce figure this out the overheating was from the water pump not being able to spin efficiently but now it dont overheat
     
  11. Mar 29, 2012 at 10:45 AM
    #11
    dooredtaco

    dooredtaco [OP] Well-Known Member

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    could the Engine coolant temp. sensor cause it to run bad the other day i remember a code that popped up and said Engine coolant temp. sensor malfunction
     
  12. Mar 29, 2012 at 10:47 AM
    #12
    dooredtaco

    dooredtaco [OP] Well-Known Member

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    im on my way to my shop now and i will try a new EFI main relay from my other truck its the green one under the dash right?
     
  13. Mar 29, 2012 at 10:51 AM
    #13
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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    I had the ECT sensor code on my first gen before and it never ran like you described. The panel cover should tell which relay is which. I forget which is which. Double check that EFI fuse too.
     
  14. Mar 29, 2012 at 10:53 AM
    #14
    dooredtaco

    dooredtaco [OP] Well-Known Member

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    ok thanks i will let you know as soon as i get there
     
  15. Mar 29, 2012 at 10:58 AM
    #15
    dooredtaco

    dooredtaco [OP] Well-Known Member

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    im gonna stop and get a engine coolant temp. sensor on the way also
     
  16. Mar 29, 2012 at 10:58 AM
    #16
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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    Definitely won't hurt.
     
  17. Mar 29, 2012 at 2:38 PM
    #17
    dooredtaco

    dooredtaco [OP] Well-Known Member

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    Hey good news the old engine temperature sensor was melted new one in and she is singing lol thanks so much for the replies
     
  18. Mar 29, 2012 at 2:52 PM
    #18
    wolftree

    wolftree Well-Known Member

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    Good job.
     
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