VinhZXT Posted April 23, 2005 Share Posted April 23, 2005 My 280ZXT doesn't have any sensor on the intake. All it has is the temp head sensor. I want to bypass this sensor so that the ECU always thing the car is warmed up every time I drive it. The reason for this is I only drive this car in nice weather only. Since I don't have all the air regulator, AAC and EGR etc... I can't compensate for the extra fuel. Therefore my car will run rich on warm up. I would like to eliminate this by hook up a 200 ohm resistor accross the temperature head sensor. Anyone got any solution for my problem? Thanks for any info. Quote Link to comment Share on other sites More sharing options...
pjo046 Posted April 29, 2005 Share Posted April 29, 2005 Your car will NOT run rich, if you have removed the coldstart-injector. This is the only thing that adds extra fuel when the engine is not warmed up. And I assume you have removed this one along with the air regulator, AAC and EGR etc. Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted May 5, 2005 Share Posted May 5, 2005 280zxt did not have a cold start injector like na motor.it wont run rich.if the o2 sensor and proper thermostat is in place the ecm will correct itself.the ecm does not have a monitor system for the aac valve being disconnected-removed.the ecm doesnt care.if you put a low temp thermostat in it the ecm will run on open loop-meaning no control by o2 sensor.put a 180 or 192 thermostat in it and make sure 02 sensor has proper output.car will run fine. Quote Link to comment Share on other sites More sharing options...
VinhZXT Posted May 5, 2005 Author Share Posted May 5, 2005 Randy, Thanks for the info. I've tried it and no difference and I've figured it out. During the warm up period like you said it is in the open-loop mode and it dumps a certain amount of fuel in the engine and it assumed that the air regulator would compensate for the amount of air to get the RPM higher for a faster warm up. Well I took the air regulator off so there is not enough air going into the intake and therefore it's running rich during the warm up period. The thermostat should have nothing to do with this. The warm up cycle for the O2 sensor not the coolant because it is back to normal after the O2 sensor starts sending signal to the A/F mixture gauge. If I want to get rid of this I have to get a heated O2 sensor that will speed up the warm-up cycle for the O2 sensor. That will inturn unrich the mixture sooner. Quote Link to comment Share on other sites More sharing options...
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