Running rich 12afr

1989toyotasupraandpickup · 06-16-2012, 08:31 AM

Ya i didn't want to start a new thread but no one was chiming in quick enough on the other one. I thank you for chiming in and helping when i need it. Your very knowledgeable on the supra. The wideband gauge goes to the gauge only and not to the ecu. Already checked. Will check the power and ground to the sensor and remove it to calibrate it to see if its malfunctioning. ECU temp sensor is new. My electric fan is probably turning on to early keeping the engine a little cooler.

Took the narrowband sensor out and it tested fine with the propane torch .988v with the flame and .012v with no flame. The on car diag Vf1 and e1 indicates the sensor is not working correctly. It does not fluctuate 8 times in 10 seconds. I will take pictures of the spark plugs and post them here. If you get time take a gander at the video. You will see where the a/f ratio sits. Even when i rev the engine. Does not move barely. Im going to take the manifold off today and seal it with copper rtv gasket sealer and see if that helps. The only thing i can think of that would cause my rich running condition. Does it act like a boost leak if the intake gasket has a leak? Its worth a shot and i am going to clean my injectors to make sure they are not leaking or clogged.

Saw on youtube a nice injector cleaner setup. Cant test the flow but you can clean the gunk out of them. Looks like it works good. i went to school for electronics and know how to diag electronics but the manual gives you nothing on how to diagnose the problems. like you said the manual is a broad repair method. My brother is a mechanic but he has no time to help me out. The AFM may even be toast but no code. Engine wont rev with
AFM unplugged but will idle. no code with oxygen sensor unplugged either. When i unplug the AFM i get a code along with the ecu temp sensor when thats unplugged.

Sorry to hear about the puppy. I hope he gets better. My puppy broke is back 2 legs when he ran out the door and into the main road. Doing good now all healed and happy to be alive. Thanks for the help i appreciate it.

06-16-2012, 08:31 AM	#3
1989toyotasupraandpickup Stock Join Date: Jun 2012 Location: ny Posts: 26	Ya i didn't want to start a new thread but no one was chiming in quick enough on the other one. I thank you for chiming in and helping when i need it. Your very knowledgeable on the supra. The wideband gauge goes to the gauge only and not to the ecu. Already checked. Will check the power and ground to the sensor and remove it to calibrate it to see if its malfunctioning. ECU temp sensor is new. My electric fan is probably turning on to early keeping the engine a little cooler. Took the narrowband sensor out and it tested fine with the propane torch .988v with the flame and .012v with no flame. The on car diag Vf1 and e1 indicates the sensor is not working correctly. It does not fluctuate 8 times in 10 seconds. I will take pictures of the spark plugs and post them here. If you get time take a gander at the video. You will see where the a/f ratio sits. Even when i rev the engine. Does not move barely. Im going to take the manifold off today and seal it with copper rtv gasket sealer and see if that helps. The only thing i can think of that would cause my rich running condition. Does it act like a boost leak if the intake gasket has a leak? Its worth a shot and i am going to clean my injectors to make sure they are not leaking or clogged. Saw on youtube a nice injector cleaner setup. Cant test the flow but you can clean the gunk out of them. Looks like it works good. i went to school for electronics and know how to diag electronics but the manual gives you nothing on how to diagnose the problems. like you said the manual is a broad repair method. My brother is a mechanic but he has no time to help me out. The AFM may even be toast but no code. Engine wont rev with AFM unplugged but will idle. no code with oxygen sensor unplugged either. When i unplug the AFM i get a code along with the ecu temp sensor when thats unplugged. Sorry to hear about the puppy. I hope he gets better. My puppy broke is back 2 legs when he ran out the door and into the main road. Doing good now all healed and happy to be alive. Thanks for the help i appreciate it.