94RedGt
Member
Hey guys, so my 94 GT has been having problems for a while, its mostly Idle related, i almost have it running well now after all the trouble it has given me, i went to check the ECM and found out it had a chip installed , its a Chipmaster Revolution from Diablosport, i took it off to see if my car ran better and yes it does, the engine is mostly stock with no internal work done to it so i dont see how a chip would be usefull, car now reaches proper operating temp, it has a bit better topend pull also.
So i took the car to my friends shop because some codes came on after the chip was removed, the chip was blocking whatever was setting off the codes and thats why the Check Engine didnt not turn on before, he hooked up an OBD1 scanner that also has the ability to tell u pretty much everything while the engine is running. For some reason the scanner did not get any codes so i might try the old jumper method later and see what i get, anyways while he had the scanner on he went to the Data page were it shows volts, rpms O2 readings etc, and heres what it got,
The car was operating at Closed Loop.
Idle was mostly around 680 to 720 it would jump around that.
Maf was reading .88 volts
Spark Advance was 21 to 22 at idle
TPS was at .92 volts
Now the oxygen sensor readings is what bothered me,
O2 # 1 was constantly reading 245-270 mV
O2 # 2 was reading all the way to 720 mV then it came back to 10 then slowly went back to 700ish the back down so on,
My buddy told me that O2 # 1 is the one not working properly and its causing my passanger side bank to run leaner then the drivers side, is this correct ? Should i replace the #1 O2 sensor or should i check other things before ? And if i have to replace it wich one is the number 1 O2 ? Number 1 cylinder is on the passanger side so could it be the right side O2 Sensor ? This could be the solution to my bad idle problems , car has a tendency to miss a bit on idle making it seem like it has a loopy cam but it does not have an aftermarket cam im sure of that because while the car is cold or in open loop the idle is smooth and a loopy cam would be heard at idle no matter what.
So i took the car to my friends shop because some codes came on after the chip was removed, the chip was blocking whatever was setting off the codes and thats why the Check Engine didnt not turn on before, he hooked up an OBD1 scanner that also has the ability to tell u pretty much everything while the engine is running. For some reason the scanner did not get any codes so i might try the old jumper method later and see what i get, anyways while he had the scanner on he went to the Data page were it shows volts, rpms O2 readings etc, and heres what it got,
The car was operating at Closed Loop.
Idle was mostly around 680 to 720 it would jump around that.
Maf was reading .88 volts
Spark Advance was 21 to 22 at idle
TPS was at .92 volts
Now the oxygen sensor readings is what bothered me,
O2 # 1 was constantly reading 245-270 mV
O2 # 2 was reading all the way to 720 mV then it came back to 10 then slowly went back to 700ish the back down so on,
My buddy told me that O2 # 1 is the one not working properly and its causing my passanger side bank to run leaner then the drivers side, is this correct ? Should i replace the #1 O2 sensor or should i check other things before ? And if i have to replace it wich one is the number 1 O2 ? Number 1 cylinder is on the passanger side so could it be the right side O2 Sensor ? This could be the solution to my bad idle problems , car has a tendency to miss a bit on idle making it seem like it has a loopy cam but it does not have an aftermarket cam im sure of that because while the car is cold or in open loop the idle is smooth and a loopy cam would be heard at idle no matter what.
