Yet again my b18c swap has run into trouble. (b18c block, p72 head, oem type r style TB/MI, AEM CAI, oem exhaust manifold, P73 ECU)
Last time it was leaning out horribly STFT (maxing out at +45.9%. Now at idle the STFT will range between -16% to -24%.
Now the ECU is having to remove fuel.
I managed to get the car to pass smog (CA). Yet on the HC's I barely passed by reaching the maximum allowed 60ppm during the 15mph portion of the test.
Things that I have checked;
-TPS: about 9.8% w/engien off
-Ignition timing: 16BTDC
-MAP: at idle less than 10.5 Hg" (2.9V)
-Valve timing: IN 0.007 & EX 0.008
-Spark plugs just replaced (NGK iridium)
-Cap & Rotor replaced
-Both oxygen sensors have been replaced
-Removed catalytic converter: no signs of contamination or damage
-IAT: same as ECT in the morning (~48 degrees) 2.6V
-ECT: same as IAT in the morning (~48 degrees) 2.6V
-Last engine compression: about ~230psi results in all 4 cylinders
-Removed fuel rail (engine off key on) no injectors leaked
-Spark plug wires are MSD super conductors about 6yrs old
-Fresh fuel
-PVC valve; shake, can hear clicking
The only thing I have began noticing on the dash is that the coolant temperature tends to stay below "normal" or the middle level. It used to stay right in the middle an now it sits a little lower.
Yet I also upgraded the cooling system (racing rad+fan+thermostat+fan switch+rad cap) with mishimoto/mugen parts
But even thought I did modify the cooling system maybe the temperature sending unit or the ECT is going bad??? thus the rich condition?? idk
Iv'e wondered if it might be a vacuum leak causing this problem; excess air=more fuel, but have been able to find nothing
Sorry about the long story but I think it is relevant information to the problem and a possible solution.
Please advise & Thank you
Last time it was leaning out horribly STFT (maxing out at +45.9%. Now at idle the STFT will range between -16% to -24%.
Now the ECU is having to remove fuel.
I managed to get the car to pass smog (CA). Yet on the HC's I barely passed by reaching the maximum allowed 60ppm during the 15mph portion of the test.
Things that I have checked;
-TPS: about 9.8% w/engien off
-Ignition timing: 16BTDC
-MAP: at idle less than 10.5 Hg" (2.9V)
-Valve timing: IN 0.007 & EX 0.008
-Spark plugs just replaced (NGK iridium)
-Cap & Rotor replaced
-Both oxygen sensors have been replaced
-Removed catalytic converter: no signs of contamination or damage
-IAT: same as ECT in the morning (~48 degrees) 2.6V
-ECT: same as IAT in the morning (~48 degrees) 2.6V
-Last engine compression: about ~230psi results in all 4 cylinders
-Removed fuel rail (engine off key on) no injectors leaked
-Spark plug wires are MSD super conductors about 6yrs old
-Fresh fuel
-PVC valve; shake, can hear clicking
The only thing I have began noticing on the dash is that the coolant temperature tends to stay below "normal" or the middle level. It used to stay right in the middle an now it sits a little lower.
Yet I also upgraded the cooling system (racing rad+fan+thermostat+fan switch+rad cap) with mishimoto/mugen parts
But even thought I did modify the cooling system maybe the temperature sending unit or the ECT is going bad??? thus the rich condition?? idk
Iv'e wondered if it might be a vacuum leak causing this problem; excess air=more fuel, but have been able to find nothing
Sorry about the long story but I think it is relevant information to the problem and a possible solution.
Please advise & Thank you