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injector duty cycle & pulse width spike after gear shifting

Posted: Wed May 07, 2014 5:58 pm
by sangai
please help with the highlighted graph..
car bogging when shift gear..

Re: injector duty cycle & pulse width spike after gear shift

Posted: Thu May 08, 2014 6:55 am
by Hondata
Air temperature is 7 degrees? O2 sensor is enabled but heater is disabled? Duty cycle is 100% - you're at the limit of the injectors, but then the low IAT is adding a lot of fuel. Ignition timing is very high - again I think from the low IAT.

Re: injector duty cycle & pulse width spike after gear shift

Posted: Thu May 08, 2014 9:23 am
by excaliburcombo
IAT temp too low.

Re: injector duty cycle & pulse width spike after gear shift

Posted: Fri May 09, 2014 10:45 pm
by sangai
thanks for the reply..about the IAT thing its could be the sensor problem? because its only happen after shifting when i floored the pedal.."O2 sensor is enabled but heater is disabled" <--- my bad..will do a run n update.. thanks.. :)

Re: injector duty cycle & pulse width spike after gear shift

Posted: Sat May 10, 2014 1:04 am
by excaliburcombo
Maybe your IAT sensor bad. IAT show low temp across the datalog. Also you can observe IAT compensation add 13%. That why your duty cycle hit 100% and ignition timing running higher from ignition table.

Re: injector duty cycle & pulse width spike after gear shift

Posted: Sun May 11, 2014 10:40 pm
by aaimada
Try shaking/ wiggle the wires at the IAT sensor all the way back to the ecu and monitor the IAT voltage. Watch for any drop outs. Its possible while shifting, your motor torques and causes the wires to move around for that spit second then returns to its normal position. Does this also happen while driving over bumpy roads?

Re: injector duty cycle & pulse width spike after gear shift

Posted: Mon May 12, 2014 6:49 am
by Hondata
The normal cause of a bad IAT is plugging the IACV into the IAT by mistake.