SES light codes 32,44 HELP!

Discussion in 'The Garage' started by 89K5guy, Oct 19, 2005.

  1. 89K5guy

    89K5guy 1/2 ton status

    Jul 11, 2005
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    I have an 89 K5 with approx.111000 miles.After driving for about 15 -20 minutes the dreaded SES light comes on.The codes 32 and 44 are supposedly
    the culprits.The 350 has headers and dual exhaust with the O2 sensor on the
    drivers side.No air pump.I have taken the EGR valve off and cleaned it but it looked pretty good when it came off.I removed the O2 sensor and it looked
    a little black.It seems to run okay even after the SES light comes on.Any ideas on a plan of attack?I just finished putting all new floors in this thing and
    need to get it ready for winter mechanically.Any help would be greatly appreciated :D
  2. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

    May 23, 2005
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    back home in Houston
    Can you tell me what the codes 32 and 44 actually are in the book?
  3. Russell

    Russell LLY Escalade Status Premium Member GMOTM Winner

    Jun 23, 2000
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    Edmonton, Alberta
    32 = EGR failure:

    A egr failure will set this code. Either a faulty egr valve, egr temp. switch or the egr control solenoid. . When the egr solenoid is operating properly, the ecm will activate it, allowing vacuum to open the egr valve, this in turn will allow the hot exhaust gases to circulate through the egr valve, and the egr temp. switch will heat up until it reaches its activation temperature, will close and send s grounded signal back to the ecm telling it the conditions have been met. If the switch is closed on start up or does not close when the operating parameters are met, this code will be set.

    44 = Lean Exhaust Condition:

    This code will be set whenever the ecm perceives a lean exhaust condition. The main causes for this is a grounded O2 sensor, low fuel pressure, restricted injectors, contaminated fuel, exhaust leaks or bad air switching valve. The condition met to set the code is a low O2output voltage (less than 0.2V)around a minute with the ecm is closed loop.

    This is from a TPI site, so the EGR does not operate the same way, but I am pretty sure that the codes mean the same thing between the two.

    With my TBI truck, I had to actually remove the intake, and shoot my sandblaster down the EGR bore to clean the carbon out. It didn't work prior to that, and it looked ok too. If you go that route, be 100% sure that you get ALL the sand and dust out of the intake before you consider bolting it back on, and make sure that the EGR is cleaned up. Also, replace the solenoid, it may be faulty as well -- You can find it on the passenger's side of the engine, by the spark module.

    Your lean condition is probally caused by the headers. They do one of two things -- First is help the engine breath better, which means that it needs more fuel, and second, by the time the exhaust gases get to the 02 sensor, they are usually too cool for the 02 sensor to work correctly.

    Also it could be just the 02 sensor getting old. With age, they stop working as well, and eventually produce so little voltage that the ECM percieves a lean condition, and pours more fuel than is needed into the engine (would explain why your 02 sensor is black, it should be a nice golden brown color) Don't get any typical parts house 02 sensor when you replace it. Get an AC-Delco heated 02 sensor. They are the best you can get, and have an internal heater so they get into closed loop faster (or in the case of headers, at all)

    Just gotta hook the two coil wires up to ground, and an keyed ignition source, and the third wire to the stock 02 sensor wire to the ECM.

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