2003 4g64 Idle Problems
As for adjusting the TPS I tried your suggestion but the lowest value I could get was 60%. That's why I'm thinking even this new TPS is bad. Or something else is causing it to have a high reading.
Were the parts you replaced new, refurbished or used? New parts can be defective so that's a possibility.
Also check for damaged wires, bad ground connections and such. If you had to splice anything that could very well cause these issues.
Also check for damaged wires, bad ground connections and such. If you had to splice anything that could very well cause these issues.
thats crazy about your coolant temp, on cold start you should be down around 60 degree and work up to around 180 degree at running temp. is the factory gauge showing the temp that high? As far as checking the voltage, I doubt you need that special tool. The way i adjusted one on my mustang. i took a pin and put it thru the wire that has the signal and connected that to the positive lead. then i took the neg on the multimeter and connected it to a bare spot on the car. I left the connection plugged in. least doing it this way, you can see if the problem is at the TPS or if the ECU is getting the wrong info. When you were scanning the car and got 60% was that with the car running or just on auxiliary? If you're having multiple problems with data, maybe your ECU is ready to crap the bed
The car was running while getting the 60% reading. I kind of doubt the ecu is getting ready to die. I do think it is possible that the temp sensor could be bad. I'm also considering the possibility of the upstream O2 sensor being bad. This morning driving in to work I noticed that when the car would hesitate the O2 was showing very rich. But if it were rich but within .8 volts. So maybe the O2 is sending wrong info?
I'm also concerned about the fact that the car won't go into closed loop. Not sure what sensor is causing that. I wonder if it is time to connect my laptop to the ecu and see if I get more info or something torque won't tell me.
I'm also concerned about the fact that the car won't go into closed loop. Not sure what sensor is causing that. I wonder if it is time to connect my laptop to the ecu and see if I get more info or something torque won't tell me.
Last edited by jforward5; Jan 23, 2014 at 08:26 AM.
I just looked at my log. I'm at 13.3% tps at idle. o2 sensor reading at idle is .039, coolant temp starts at 93 degree and runs at 185 degree.
I know with the TPS for the 4g94, in the instructions, you can check the resistance of the sensor itself to see if the sensor is working properly.
I know with the TPS for the 4g94, in the instructions, you can check the resistance of the sensor itself to see if the sensor is working properly.
I just looked at my log. I'm at 13.3% tps at idle. o2 sensor reading at idle is .039, coolant temp starts at 93 degree and runs at 185 degree.
I know with the TPS for the 4g94, in the instructions, you can check the resistance of the sensor itself to see if the sensor is working properly.
I know with the TPS for the 4g94, in the instructions, you can check the resistance of the sensor itself to see if the sensor is working properly.
Yea I did have to use the connector from the donor car for the TPS. Later today I will trace the wire and see if there is a short. And since I got 3 tps now I will try each of them. Hopefully one of them works.
Last edited by jforward5; Jan 24, 2014 at 07:55 AM.
How right you were RaCh3T8G! I went back over my splice and the instructions from darkmitsu's how to and found my problem. 2 of the wires were backwards! Now the car is finally idling properly after 3 years! Now I'm looking into some of the other sensors since it is now idling within proper range.


