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  #1  
Old 01-08-2013, 12:05 AM
dbezzek524 dbezzek524 is offline
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Default Maintenance Troubles, please help!

I am noticing a loss in power, with a drop in mpg, with a knocking or kind of sounds like its misfiring under the truck. I can also feel the tapping in my seat and it only occurs when the truck sits in park and the trucks idle drops to 500 rpm when it is usually around 610. Also at time when I first run the truck it has problems shifting from 4th to 5th. Please help thanks.
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Old 01-08-2013, 12:09 AM
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Any codes in the PCM?
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Old 01-08-2013, 03:38 PM
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No codes at all I keep checking and still no codes. So far I have replaced the MAP sensor and the PCV valve and no improvement.
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Old 01-08-2013, 03:52 PM
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I'd be inclined to look at the data for the O2 sensors and see if they're sluggish and need replacing.
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Old 01-08-2013, 07:02 PM
dbezzek524 dbezzek524 is offline
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I took the O2 sensors off and tried to clean them but is there anyway I can test them to check their performance or to see if they are even working.
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Old 01-09-2013, 08:33 AM
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You can if you have a scan tool that will show you the live data stream. You can watch the voltages and switching rates to see what they're doing.
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Old 01-09-2013, 06:20 PM
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I have a regular code reader not a scanner so is there any other ways to know if the o2 sensors are going bad?
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Old 01-09-2013, 07:18 PM
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Not really, other than throwing a code.
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Old 01-09-2013, 10:30 PM
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Besides the o2 sensors what else do you think the problem could be?
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Old 01-09-2013, 10:35 PM
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A broken flex plate could cause the cam/crank signal to be out of whack and you'd have these symptoms. This is actually a better fit than the O2 sensors because this would explain the knocking noise. Reading a large difference (more than 5 degrees) in the cam/crank difference in the data stream will tell you if you need to pull the trans and check the flex plate.
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