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SES Light flashing

This is a discussion on SES Light flashing within the General Help forums, part of the LSx Technical Help Section category; Here is another cause from the service manual: intake manifold that has a vacuum leak may cause a misfire. Inspect ...

  1. #21
    Member edbird's Avatar
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    1999 trans am convert

    Here is another cause from the service manual:

    intake manifold that has a vacuum leak may cause a misfire.

    Inspect for the following:

    Improperly installed or damaged vacuum hoses
    Faulty or improperly installed intake manifold and/or gaskets
    Loose Exhaust Gas Recirculaton (EGR) valve pipe or damaged or missing O-ring seal
    Cracked or damaged intake manifold Inspect the areas between the intake runners.
    Improperly installed or damaged Manifold Absolute Pressure (MAP) sensor housing (located at the rear of the intake manifold)
    Improperly installed or damaged MAP sensor housing O-ring seal
    Improperly installed MAP sensor or vacuum hoses The sealing grommet of the MAP sensor should not be torn or damaged.
    Improperly installed throttle body or damaged gasket
    A loose EGR valve pipe assembly or damaged or missing O-ring seal
    Warped intake manifold
    Warped or damaged cylinder head sealing surface

    Might try to check for cracked hoses as I heard guys complain about this many times.Good Luck!

  2. #22
    R/A T/A SS/CETA's Avatar
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    2002 Pontiac Trans Am CE

    Thanks. I'm sure hoping it's not any of the list posted above. ^^ I'm a little past broke right now and can't afford to fix anything requiring new top-end parts like the manifold or O-ring seal.
    1996 Chevy Impala SS
    Puck Mod
    Street Trends Ram Air Hood & Euro-Style Bumper
    Pioneer Deck
    Power Acoustik Components,PW3 12's, 2200w Amp
    2002 Pontiac Trans Am Collector Edition
    Shorty headers
    cam
    Full 3" exhaust
    dual-intercooled tips

  3. #23
    R/A T/A SS/CETA's Avatar
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    I've already stated I've done all I know. I apologize for coming on here and not having my parts price rolodex out and my vast knowledge of the LS1 on hand. Honestly, if I had the foggiest clue what was wrong, do you think I'd bother posting a thread with my problem? I'd think that thread would be a walkthrough on how to fix the problem.

    Smart ass. Gas prices here are 2.53. Sucks to be you if you're still paying that much.

  4. #24
    grand poobha james schofield's Avatar
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    tan
    1999 trans am

    I have a few manifold o-rings laying around if you need em, just let me know and I will throw them in the mail.

  5. #25
    grand poobha james schofield's Avatar
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    tan
    1999 trans am


    have you over rev'd it ?? I did on my ta and it was misfiring on number 8 due to a bent valve. all the injector codes were going off like yours.

  6. #26
    R/A T/A SS/CETA's Avatar
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    I had the car looked at with one of those $10,000 diagnostics machines yesterday and I've got a blown 02 sensor on bank1 sensor1. It was reading 78 degrees when he tested it.

    He reset the codes and they stayed off until I took it for a drive. The SES light comes on and flashes in 3 minute increments for about 20 seconds, then goes off and the car runs fine. It finally just stayed on solid after 15 minutes of driving, but I didn't notice any loss in power like I did with it blinking for 20 seconds every 3 minutes.

    Is that due to the computer sending a reading to that sensor and receiving news that it's going bad?

  7. #27
    old timer blue02Z's Avatar
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    2002 Z28

    i dont see how you were getting p0200 and 308 codes if it was just the o2s. o well, i guess replace it, they are heated so they can get into closed loop faster, the heater circuit is a common problem to go south on 02s

  8. #28
    R/A T/A SS/CETA's Avatar
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    The 02 sensor is bad, but I used the OBDII again today and it's the P0200 injector code. The car's running normal, though.

  9. #29
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    2000 Camaro SS

    I have a couple of O2's that I extended the wiring for headers. they worked fine when pulled. You pay for shipping and they are yours. I have held onto them b/c they still work fine, but replaced with 13111 sensors. PM me if you want them. I also have a couple sets of stock injectors. If you'd like a set, pay shipping and they are yours. I hang onto my stock stuff for people that need it and usually give the stuff away.

  10. #30
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    Ok thanks. Let me know how much shipping is for them. And these are stockers? Sensor 1 Bank 1 is bad.

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