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  #1  
Old 07-27-2008, 11:51 AM
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P0170 P0173 Error codes Definitive test on AMM

2000 C280 with 63m. I have been getting an intermittent CEL that is now on all the time. Error code is P0170 and P0173. Is no power at 4000RPM and WOT a definitive indication that the AMM is kaput? Power seems fine at 4000 rpm and hard acceleration. Tried a spritz of CRC sensor cleaner but light comes back on within 20 miles. Just had a previous code P0150 and changed left front o2 sensor. Just changed plugs and wires to cure a rough idle. And I am due for a fuel filter change.

glenmore
2000 C280
1991 300CE
1990 LS400
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  #2  
Old 07-27-2008, 01:26 PM
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The definitive test would evaluate fuel trims data or viewing calc load on OBDII during the event.

But since I buy them by the bushel I'd just throw one at it and view the results to save a step.
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  #3  
Old 07-27-2008, 06:46 PM
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Steve, are you saying to look at the calc load "snapshot" data stored when the code happened? What do you look for?
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  #4  
Old 07-27-2008, 07:03 PM
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No, I'm saying to look at the calculated load pid when the engine falls on its face at 4000+rpm full throttle.

Calculated load should be over 80% in such conditions. Calc load is calculated from AMM output. If the output calculates to 40-60% then it obviously is under reporting such a condition.
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  #5  
Old 07-27-2008, 09:07 PM
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http://www.picoauto.com/automotive-oscilloscope-guide/lambda-sensors.html

One of my favorite videos... guy is articulate , too.
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Last edited by Arthur Dalton; 07-27-2008 at 09:25 PM.
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  #6  
Old 07-27-2008, 09:10 PM
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change your MAF
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  #7  
Old 08-01-2008, 09:15 AM
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So far so good. Replaced the AMM insert and no CEL so far. After cleaning and clearing the codes last time, the CEL came back on after a day or so.

Thanks all,

glenmore
2000 C280
1991 300CE
1990 LS400
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