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SES Flashing, Lean bank 1, Misfire #6 running poorly

This is a discussion on SES Flashing, Lean bank 1, Misfire #6 running poorly within the General Help forums, part of the LSx Technical Help Section category; As state above the SES Flashing, Lean bank 1, Misfire #6 running poorly... Anyone with suggestions? All new o2's about ...

  1. #1
    Member bhunter0830's Avatar
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    Angry SES Flashing, Lean bank 1, Misfire #6 running poorly

    As state above the SES Flashing, Lean bank 1, Misfire #6 running poorly... Anyone with suggestions?

    All new o2's about 10k ago, WB o2 reading 17.9 and --- and sounds like it's starving and shaking badly. New plugs and wires EGR and AIR was deleted when the LTH's, ORY and SLP Exhaust installed about 10k ago as well.
    2000 Trans Am - Sold
    BBK LT's, ORY, SLP LM2, SLP Cold Air Intake, Wide Band O2, American Racing Torq Thrust 2's, Founders STB, LCA's, LCA Relocation Brackets, Adjustable PHB, BMR Lowering Springs. Deleted AIR & EGR & Tuned By Frost. 1 of 23 MRM with options.

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    Spaz is My Mentor SMWS6TA's Avatar
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    check fuel pressure at the rails. At idle should be around 50 psi.

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    Member bhunter0830's Avatar
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    Don't have a fuel pressure gauge...

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    Smiles for 9.5 Years cammed goat's Avatar
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    Did you check the wire on coil number 6? Could be loose. Check your coil pack for that cylinder as well. For a start anyway.

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    Senior Member Too Fast's Avatar
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    When did you last clean your MAF? Usually that shows up as lean on both banks, tho, like a fuel pressure problem would. Any vacuum leaks? Is your injector firing? You could swap it out to another cylinder to see if the missfire follows, if you've already ruled out an ignition problem.

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    Spaz is My Mentor SMWS6TA's Avatar
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    gauge you can pick up at parts stores for around $20

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    Member bhunter0830's Avatar
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    Come to find out it seems to be a back coil pack on #6. The tech also stated that they are firing way to high. Should be between 10-12k and are firing around 15-18k. Is this something that could have happened during the tune? I'll pull the plugs on it tomorrow and take a look and see if they are white. If that is the case, should I not run the car until it is retuned to make that adjustment? If so, I am going to take my lashing for not using Frost.

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    Member bhunter0830's Avatar
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    Quote Originally Posted by bhunter0830 View Post
    Come to find out it seems to be a back coil pack on #6. The tech also stated that they are firing way to high. Should be between 10-12k and are firing around 15-18k. Is this something that could have happened during the tune? I'll pull the plugs on it tomorrow and take a look and see if they are white. If that is the case, should I not run the car until it is retuned to make that adjustment? If so, I am going to take my lashing for not using Frost.
    The fuel pressure reads good across the board also. So fuel pump is out and pressure regulator.

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    Smiles for 9.5 Years cammed goat's Avatar
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    Your tuner could have made the computer run too lean.

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    Member bhunter0830's Avatar
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    Quote Originally Posted by cammed goat View Post
    Your tuner could have made the computer run too lean.
    That is entirely true! Do I dare drive it and run the risk of the same issues or just send it to Frost?

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    I would NOT drive the car with it running that lean. You are asking for detonation to occur.
    It's on jackstands.

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    Smiles for 9.5 Years cammed goat's Avatar
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    Ditto on what Jon said. Put the car away and send your PCM to Frost for a tune. Let him work his magic.

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    None Shall Pass Knight's Avatar
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    I'm also with Rich and Jon. Don't run the car until the issue is fixed.

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    Member bhunter0830's Avatar
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    Replaced the coil pack on #6. AFR is back to reading between 14.5-15 at idle and driving. It is also correcting itself where it couldn't before. The #6 plug was also replaced and doesn't look bad. Still a small misfire but noting too noticeable. Will replace rest of plugs when engine is cooled down. Any additional thoughts? It was tuned almost 3 months ago and have put 7000 miles on it with out a problem until then. I know I need a tune by Frost, but is it safe to drive now?
    Last edited by bhunter0830; 06-09-2012 at 12:01 PM.

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    Member bhunter0830's Avatar
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    I stand corrected. Back to the same issue with running too lean and choking out. Here's a short clip of what the AFR gauge is reading. Sorry my hands a little shaky.


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    Member bhunter0830's Avatar
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    Please let me note that it is lean on Bank 2 not Bank 1 as stated in the subject, that was my error.

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    If it lean on bank 2 then it sounds like a stuck closed injector
    2002 tahoe 5.3L CAI, tr224 112lsa cam, ls6 springs, 10.4mm plug wires, monster trans stall converter 2,300-2,500 rpm, cat delete, flowmaster exhaust, custom tune by wayne hartwig

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    Member bhunter0830's Avatar
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    All of the fuel trims read normal when on the diagnosis reader at the shop on Friday. i'll have to go buy one I guess. I don't want to drive it in the event I cause more issues.

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    Switch the injector to the other bank an see what happens

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    Member bhunter0830's Avatar
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    Quote Originally Posted by Wfolsom View Post
    Switch the injector to the other bank an see what happens
    I will try that. I am going to be replacing the OPSU as it's cracked and leaking along with cleaning up the mess it's created. I am also replacing the intake seals and gaskets. I am also going to clean the MAF and TB.

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