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post #1 of 11 Old 02-20-2011, 05:59 PM Thread Starter
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Codes Please Help.

I was driving home and the CEL came on. Scanned it at a gas station. p0401 EGR flow low and p1102 MAF is within limits, but lower than expected. Had no codes before. The only thing I can think of is I got water on the MAF during my coolant flush. Would that do it?


03 F250 CC/SB 4x4
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post #2 of 11 Old 02-21-2011, 05:58 PM Thread Starter
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Took superchips towsafe off and loaded stock in. EGR p0401 went away but code p1102 still comes up. Whats up?


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post #3 of 11 Old 02-22-2011, 05:57 PM Thread Starter
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All the smart guys on here and nobody knows how to fix a p1102.


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post #4 of 11 Old 02-22-2011, 06:15 PM
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If it were mine, I'd inspect the Mass Airflow Sensor on the air Intake duct for connections and loose wires. Perhaps cleaning the circuit path with a chemical cleaner that would eliminate moisture or corrosion if you think it had something to do with the flush... The code intakes low flow right?
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post #5 of 11 Old 02-22-2011, 06:41 PM Thread Starter
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Yeah 401 egr flow low. I am really stressed over these codes. I cant concentrate on anything but fixing my rig.


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post #6 of 11 Old 02-22-2011, 07:16 PM
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Remove and clean your EGR valve. There are instructions on any of a number of sites online. Should have you fixed up. Takes about 30 minutes. Good luck.
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post #7 of 11 Old 02-22-2011, 07:35 PM Thread Starter
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It is clean as a whistle and no change. Just the p1102 still.


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post #8 of 11 Old 02-22-2011, 07:50 PM
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Is it a P1102 by itself, or are there other codes as well? Is it an early-build 2004 or late-build 2004? Assuming it's a late-build 2004, the pinpoint test to diagnose a P1102 by itself is very straightforward. But to do this, you will need a scan tool that can read live data so that you can access MAF volts. At engine idle, you should see between 1.2 to 1.8 volts. With engine speed increased to 2500 RPM, you should see 2.4 to 3.0 volts. With a hard P1102, you will likely see lower values. Do you have an aftermarket air filter? If so, and the values observed are less than listed above, try repeating the test with the air filter removed. If the values improve to the range listed above, re-install the factory air intake setup and retest. If the circuits check out good, but you still see lower than expected readings, replace the MAF sensor. For what it's worth I have yet to replace a MAF sensor or PCM on one of these trucks.

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post #9 of 11 Old 02-23-2011, 03:45 AM Thread Starter
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yeah i am getting 1102 alone mostly. once with 0401.


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post #10 of 11 Old 02-23-2011, 03:17 PM Thread Starter
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cleaned all sensors with maf cleaner. no codes now.


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