Check Engine Light - P0104 - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Problems and Service Talk about any mechanical problems you are having

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post #1 of 41 (permalink) Old 09-23-2012, 10:45 AM Thread Starter
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Check Engine Light - P0104

P0104, if you try to reset it, it comes back on within 5 seconds. (Perhaps a pending code keeping it on?)

Read up on the code and did the following:
-Verified that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires.
-Inspected for any air leaks near the MAF sensor.
- Tried MAF Sensor cleaner.
- Tested old MAF Sensor with Ohmmeter.
-Replaced the MAF sensor.
The light still stays on and I'm running out of time to get it fixed before I have to do the yearly emissions test in which they fail you if you have any CELs.

The balt' still runs great, but I have noticed a little less gas mileage driving 500 miles a week.

Any thoughts/tips.

I don't mind keeping my car free of CELs, but I feel emissions testing that forces me is a little overkill.

Nonetheless and rants to the side, I could use some brain power on this now that I'm already $50 in and still have a CEL even after testing.
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post #2 of 41 (permalink) Old 09-23-2012, 11:40 AM
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Did you check the connection at the ECM? The MAF wires go directly to one of the ECM connectors. Remove spray clean and re-install. Disconnect battery first.

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post #3 of 41 (permalink) Old 09-23-2012, 12:28 PM Thread Starter
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removed both ECM connectors, cleaned and re-installed after disconnecting battery, no luck.

Thanks for the idea though, hadn't thought of that, any others?
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post #4 of 41 (permalink) Old 09-23-2012, 02:15 PM
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Yeah try what cost nothing first, sorry it didn't work for you.

You will need to trace wires, check an make sure intake hasn't seperated from throttle body.

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post #5 of 41 (permalink) Old 09-23-2012, 03:24 PM Thread Starter
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- Double checked to make sure, intake has not seperated from throttle body, did let me know that my throttle body hasn't been cleaned in a while and what 20k miles can do, lol.
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post #6 of 41 (permalink) Old 09-23-2012, 03:51 PM
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So no air leaks hummm!!! What about crankcase ventilation tube or where it hooks up to on the intake.

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post #7 of 41 (permalink) Old 09-23-2012, 04:13 PM Thread Starter
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Checked that when I toke it off and made sure it was leak free when I put it back on.

Its an odd one.
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post #8 of 41 (permalink) Old 09-23-2012, 04:44 PM
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Mass air flow is obviously working because you would get a different code than P0104. This code is telling us that the amount of air going by the mass air flow sensor doesn't match the other means of measuring like the "MAP" and amount of fuel. So it either has to be a leak or an obstruction like a very dirty air filter, but this would bring down your mpg and should give you codes other than P0104. Was your throttle body on tight? Did you ever remove your throttle body, was the gasket in good condition? Do you hear a hissing sound while engine is running?

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Last edited by Coby7; 09-23-2012 at 04:50 PM.
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post #9 of 41 (permalink) Old 09-23-2012, 05:55 PM Thread Starter
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I have noticed a very slight drop in mpg, but i've also been running a 3k rpm shift point instead of 2.5k, Throttle body was on tight, I haven't removed the throttle body in a year and I didn't take it off fully when I was just cleaning it after I got the car and the gasket was in good condition. I do not hear any hissing sound unless it's a very small one but I've tried to rule out as much as possible.
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post #10 of 41 (permalink) Old 09-23-2012, 06:08 PM
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This is a long shot but since leaves have started to fall maybe your inlet box picked up some leaves or like one member on here had a beehive under the filter. I see you removed the first part of the inlet.

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