wngrog
03-28-2007, 04:15 PM
I have a 1997 3rz in my rock buggy.
About 6 months ago, I began having problems with the engine running rich periodically.
It would be running fine and then all of the suden, it woud run rich as if the computer was telling it to turn on the choke or something.
It first, it would happen just when the engine hit 180* and the fan would come one. I thought it was the temp sending unit, so I changed that.
That did not work so once when it did it, I unplugged the throttle body plug and replugged it and it ran great. That fix soon did not work either.
I have scanned the motor with a good OBD-II scanner and it does not throw any codes. Mind you, the wiring harness has most everything programmed out of it. I run a manual temp guage and the idiot light is only for oil pressure so I don't know if the computer will even remember a code or not.
One really wierd thing is once it was running rich and I was winching and it just killed the motor. THat made me think the car was not getting enough juice to run the computer.
I got a good charge on the battery and it still did this sporadically.
It has never stopped running with this problem until the last time out.
Last time out, the buggy died 2 times after running rough for 5-10 minutes and then it would not crank again until it cooled off. I though maybe the fuel was vapor locking the pump since it was hot that day. I changed the filter in front of the pump and it did not quit the next day, but it did still run rough at times.
The fact that it is sporatic is what is so infuriating. Any clues to what to do next?
I am about to replace the battery and the O2 sensor and see what that does.
About 6 months ago, I began having problems with the engine running rich periodically.
It would be running fine and then all of the suden, it woud run rich as if the computer was telling it to turn on the choke or something.
It first, it would happen just when the engine hit 180* and the fan would come one. I thought it was the temp sending unit, so I changed that.
That did not work so once when it did it, I unplugged the throttle body plug and replugged it and it ran great. That fix soon did not work either.
I have scanned the motor with a good OBD-II scanner and it does not throw any codes. Mind you, the wiring harness has most everything programmed out of it. I run a manual temp guage and the idiot light is only for oil pressure so I don't know if the computer will even remember a code or not.
One really wierd thing is once it was running rich and I was winching and it just killed the motor. THat made me think the car was not getting enough juice to run the computer.
I got a good charge on the battery and it still did this sporadically.
It has never stopped running with this problem until the last time out.
Last time out, the buggy died 2 times after running rough for 5-10 minutes and then it would not crank again until it cooled off. I though maybe the fuel was vapor locking the pump since it was hot that day. I changed the filter in front of the pump and it did not quit the next day, but it did still run rough at times.
The fact that it is sporatic is what is so infuriating. Any clues to what to do next?
I am about to replace the battery and the O2 sensor and see what that does.