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Old 29th October 2006, 10:10   #1
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Default LTFT , Ignition advance in Vtec

Guys,
1] My D16Y8 Vtec is running with a LTFT of more than zero, it shows a constant reading of 1.6 , anything more than zero is a problem.
2] The ignition advance varies between 10 to 30 degrees.. this again is too high ?

What problems should I be looking for considering that I have just got the ignition timing checked.
any suggestions what to look for ?
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Old 29th October 2006, 12:24   #2
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Quote:
Originally Posted by chetanhanda
Guys,
1] My D16Y8 Vtec is running with a LTFT of more than zero, it shows a constant reading of 1.6 , anything more than zero is a problem.
The Long Term Fuel Trim should be 1 ideally. The value greater than 1 means you are running leaner. And for D16Y8 the operating value is +/- 20%.

Quote:
Originally Posted by chetanhanda
2] The ignition advance varies between 10 to 30 degrees.. this again is too high ?
The ignition advance at operating temperature and at idle should be 12 +/- 2 degrees BTDC.
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Old 29th October 2006, 14:59   #3
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slight correction from my side ...
Its actually running with a ignition retard of 10 to 28 degrees and not advance of 10-28 degrees as reported in my earlier post
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Old 29th October 2006, 15:11   #4
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Quote:
Originally Posted by Pankaj401
The Long Term Fuel Trim should be 1 ideally. The value greater than 1 means you are running leaner. And for D16Y8 the operating value is +/- 20%.
I thought the base value of LTFT should be ideally zero, LTFT is incremented if the STFT crosses the +/- 10% threshold for extended periods.
Not sure if it is 1, plz correct me if I'm wrong
..Also my STFT bank1 is indicating variation between -5.5% and +5.5 %

Quote:
Originally Posted by Pankaj401
The ignition advance at operating temperature and at idle should be 12 +/- 2 degrees BTDC.
OK
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Old 29th October 2006, 19:13   #5
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Quote:
..Also my STFT bank1 is indicating variation between -5.5% and +5.5 %
+/- 20% on STFT would be the limit. You can find all this information in the civic repair manual available on Honda Hookup forum.
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Old 30th October 2006, 23:55   #6
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There are no trouble codes given by the ECU.. but after I still reset the codes.. the LTFT resets to zero.
It remains zero till I give it some 30-40 degrees of throttle.
It comes as 2.3 and and then goes down to a constant 1.6

Experts at TBHP have suggested I get the o2 sensor checked/AFR checked.
Could the lean condition be caused by dirty injectors.. ?
Will the following help ?
1] Put a new O2 sensor
2] Get the injectors decarbonized
3] Get the valve clarances checked
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