1988 T5 305 O2 Sensor Problem Background info - Stock 305 with Heddman headers and midpipe, installed Michigan Motorsports TBI heated O2 sensor adaptor. Power is coming from the additional ignition-on ports on the fuse block and it is grounded on the fender. Drove the car for about a month then the power wire came loose under the pedal and was crushed by the clutch and shorted. I replaced the wire, and started experiencing bogging under load when in closed loop. I tried replacing the entire adaptor and O2 sensor with the same model as well as another brand to no avail. I borrowed my friends diagnostic tool and took a ride to see that the brand new O2 sensor was reading under 100mV when I am experiencing the bogging. These sensors are supposed to operate within 100mV and 900mV. I have attached a pic of the diagnostic tool when the car is bogging. I'm not sure where to go from here, can anyone give me any advice? https://cimg0.ibsrv.net/gimg/www.thi...748815fd2b.jpg |
Re: 1988 T5 305 O2 Sensor Problem O2 sensor is showing WAY lean. Question is whether this is real, or false information. Short- and long-term fuel trim numbers are both neutral (128) so overall the computer thinks the fuel trim is good under this driving condition. I don't understand why you need to add a heated O2 sensor, when GM thinks the non-heated unit is going to work just fine. Where does Heddman put the O2 bung? |
Re: 1988 T5 305 O2 Sensor Problem
Originally Posted by Schurkey
(Post 6252371)
O2 sensor is showing WAY lean. Question is whether this is real, or false information. Short- and long-term fuel trim numbers are both neutral (128) so overall the computer thinks the fuel trim is good under this driving condition. I don't understand why you need to add a heated O2 sensor, when GM thinks the non-heated unit is going to work just fine. Where does Heddman put the O2 bung? |
Re: 1988 T5 305 O2 Sensor Problem Still looking for some help here guys if anyone knows anything on this. |
Re: 1988 T5 305 O2 Sensor Problem I would suspect that there is a fuel delivery issue. RBob. |
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