Hesitation at 2500-4000 rpm code 20 code 41
01-02-2005, 08:03 AM
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Hesitation at 2500-4000 rpm code 20 code 41
Allright guys I have a 92 gs-r and it has a hesitation at 2500-4000 rpm. It is only part throttle hesitation and ti is caused by a lean condition (16.5-17.5 a/f on the wideband)
ecu p72 gs-r ecu
1st gen b16a motor with obd-1 sensors, injectors, distributor
things I have replaced to fix it.
plug wires
cap
rotor
3 diffrent distributor
another good working ecu
gs-r wiring harness
seperate known to be good o2 sensors.
codes 20 eld and 41 o2 heater.
From what I have seen in my searches the code 41 and 20 with this exact problem are related. My stock b17a ran just fine, my 2.0 ran just fine except for one time I had a low rpm stutter which ended up being a cracked spark plug. I pulled out my 2.0 vtec and I swapped in this b16a. My stock wiring harness had a few butt connections on it so I decided to use another stock wiring harness that ran fine in the car. I know the g2 tegs are not supposed to have an ELD on them but with 1200 miles on my other motor and this ecu p72 gs-r this is the first time I have gotten a code 20.
So what would the ecu look for at 10% throttle or under at 2500-4000 rpm that would cause it to lean the car out? The other thing if your gonna say O2 sensor, yes I am getting the code for the heater on the o2 but 1 I know all 3 O2's I have tried worked fine before this swap and I just use the O2's to keep the ecu happy because the actual O2 input the ecu reads comes out of the wideband. Before anyone says that is the problem it worked perfect before this swap.
Other things I have looked at or fixed. I have cleaned and tested all the grounds from the motor to the battery, I have rechecked every wiring harness plug and it is in the correct place. The tps is dead on .5 and 4.5 at wot. Ignition timing is 18 degress and the timing belt is on tdc.
ecu p72 gs-r ecu
1st gen b16a motor with obd-1 sensors, injectors, distributor
things I have replaced to fix it.
plug wires
cap
rotor
3 diffrent distributor
another good working ecu
gs-r wiring harness
seperate known to be good o2 sensors.
codes 20 eld and 41 o2 heater.
From what I have seen in my searches the code 41 and 20 with this exact problem are related. My stock b17a ran just fine, my 2.0 ran just fine except for one time I had a low rpm stutter which ended up being a cracked spark plug. I pulled out my 2.0 vtec and I swapped in this b16a. My stock wiring harness had a few butt connections on it so I decided to use another stock wiring harness that ran fine in the car. I know the g2 tegs are not supposed to have an ELD on them but with 1200 miles on my other motor and this ecu p72 gs-r this is the first time I have gotten a code 20.
So what would the ecu look for at 10% throttle or under at 2500-4000 rpm that would cause it to lean the car out? The other thing if your gonna say O2 sensor, yes I am getting the code for the heater on the o2 but 1 I know all 3 O2's I have tried worked fine before this swap and I just use the O2's to keep the ecu happy because the actual O2 input the ecu reads comes out of the wideband. Before anyone says that is the problem it worked perfect before this swap.
Other things I have looked at or fixed. I have cleaned and tested all the grounds from the motor to the battery, I have rechecked every wiring harness plug and it is in the correct place. The tps is dead on .5 and 4.5 at wot. Ignition timing is 18 degress and the timing belt is on tdc.
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