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sputtering in low rpm range

This is a discussion on sputtering in low rpm range within the General Help forums, part of the LSx Technical Help Section category; Will do goat, going to see if autozone will let me borrow their scanner today....

  1. #21
    Stang Killer TransAmFanatic's Avatar
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    Will do goat, going to see if autozone will let me borrow their scanner today.
    SLP LT's, ORY, Flowmaster Catback, MTI Clear Lid, TB bypass, LS6 Intake,PP TB, Ram Air Mod, Tune, 3:73's, Deleted Cats, Deleted EGR/AIR

  2. #22
    Stang Killer TransAmFanatic's Avatar
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    Ok bought a code reader from autozone hooked it up and this is what I got.
    Po135
    Po405
    Po412
    Po418
    Po300.
    Trying to find the code chart on here, but can't find it.

  3. #23
    Senior Member JayTA98's Avatar
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    Quote Originally Posted by TransAmFanatic View Post
    Ok bought a code reader from autozone hooked it up and this is what I got.
    Po135
    Po405
    Po412
    Po418
    Po300.
    Trying to find the code chart on here, but can't find it.
    P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
    P0300 Random/Multiple Cylinder Misfire Detected
    P0405 Exhaust Gas Recirculation Sensor A Circuit Low
    P0412 Secondary Air Injection System Switching Valve A Circuit Malfunction
    P0418 Secondary Air Injection System Relay "A" Circuit Malfunction

  4. #24
    Senior Member JayTA98's Avatar
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    405,412 and 418 are the ones related with AIR/EGR delete so those are not the issue. Now PO135 can cuase problems. That is your driver's side up stream O2 sensor. Before the cats.

  5. #25
    Senior Member JayTA98's Avatar
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    1st of all look underneath the car and make sure the wiring for the o2 sensor is not frayed or melted. If you have headers and the downstream sensors have been deleted you will need to get a new sensor. If you don't have headers and your exhaust is stock what you can do is unplug the sensors and switch the o2 sensor after the cat (downstream)with the upstream one on the same bank(side). If the sensor after the cat is good it should improve your idle and you will now have a code for a o2 bank1 sensor 2 because you swap it.

    Then all you need is to either leave it like that or buy a new sensor. The downstream sensors let you know when you are having issues with the cats.
    Last edited by JayTA98; 12-26-2012 at 12:26 PM.

  6. #26
    Stang Killer TransAmFanatic's Avatar
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    ok just finished taking it for a ride, and threw more codes UGH!!!!!!
    po0302
    po0405 times 2
    p0152
    p0158
    p0302 again
    p0412
    p0418

    havent had the rear 02 sensors deleted when i got the car tuned.

  7. #27
    Stang Killer TransAmFanatic's Avatar
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    and for some reason it stopped throwing the 135 code, also i deleted the codes, and the car started running rough again.

  8. #28
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    po0302 - cylinder #2 misfire
    po0405 - egr (ignore)
    p0152 - Drivers front O2 sensor
    p0158 - Drivers rear O2 sensor
    p0302 cylinder #2 misfire
    p0412 - air pump ignore
    p0418 - air pump ignore (in fact pull the fuse from the fuse box)

    The O2 sensors on the drivers side are causing your issues. Are you able to do what Jay suggested?


    What he posted is the same as what I would have suggested also.


    Check the wire harness and swap O2 sensor.

  9. #29
    Smiles for 9.5 Years cammed goat's Avatar
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    Keep us posted. Damn, that's a lot of codes!

  10. #30
    Stang Killer TransAmFanatic's Avatar
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    Ok will keep yall updated, and going to swap them out today, just wondering if that will fix the misfire issue.....

  11. #31
    Senior Member JayTA98's Avatar
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    One thing at a time bud. It could resolve the multiple misfire issue. You could have more than one problem.

  12. #32
    Senior Member JayTA98's Avatar
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    Deleting the codes with a scanner is not going to fix the problem. The codes eventually will come back.

  13. #33
    Stang Killer TransAmFanatic's Avatar
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    I gotcha just asking for future reference. going change the sensors rite now.

  14. #34
    Stang Killer TransAmFanatic's Avatar
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    ok swapped the 02 sensors, guess what, no more sensor codes popping, but i still have these codes.
    p0405
    p0412
    p0418
    p0405
    p0412
    p0418
    p0300 random misfire multiple cylinders
    p0302 misfire cylinder 2

    i know the 400 codes are the egr and air codes.
    i also took a video of the engine bay when the engine started shaking, you cant see much of the shaking until i rest my arms on the car, at one point it started shaking, then stopped, then started shaking again....

  15. #35
    Senior Member JayTA98's Avatar
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    Ok i pm you more suggestions. You fixed the o2 sensor issue. Check your #2 cylinder wire, then coil and spark plug like i explained to you.

  16. #36
    Stang Killer TransAmFanatic's Avatar
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    Ok pulled the spark plug out the #2 cylinder, and found that it has 2 cracks in it, going to buy a new one possibly tomm morning when I get off work, kinda strange thatcracked, I just hope it fixes the misfire issue...if not gonna swap my coils around like jay said and see where that goes.

  17. #37
    Senior Member JayTA98's Avatar
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    Start with the spark plug 1st before you swap anything. That is an obvious problem since it is cracked.

  18. #38
    Spaz is My Mentor SMWS6TA's Avatar
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    don't forget anti-seize for the plugs.

    The plug cracked most likely from over tightening. They don't need to be super tight, a good snug fit.

  19. #39
    Stang Killer TransAmFanatic's Avatar
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    Ok went to AutoZone, and got a set of 4 plugs, they are not ngk like I had, but they are iridium, only thing is that they didn't have ngk, only autolite, and they are xp103 with a heat range of 3, the ngk plugs had a heat range of 5....will that hurt to run a colder plug on one side of the motor for now or should I just wait to get all the same plugs....my old plugs are ngk tr5 Ix plugs.
    Last edited by TransAmFanatic; 12-31-2012 at 10:34 AM.

  20. #40
    Senior Member JayTA98's Avatar
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    Im not sure about all the heat rating but i will get a plug to at least replace #2 and see if the problem goes away. Even a regular ngk gaped properly to check it out. I would just replace #2 for now and see if the code goes away and your idle improves. Then if it does you can replace all the plugs if you want.

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