I've been working on a neighbor's car recently. It's a 85/86 gli with a lot of ghetto rigging. It's got the stock ke3, but at some point, someone changed in a vac adv dizzy. Whatever. It's the least of the car's problems.
She's trying to pass smog at the moment, and it's running pig rich. So I watched the DPR from a cold start. Everything is normal, slowly dropping down to 10ma. Then it oscillates around 10ma for few seconds, and then climbs up to 20ma, where it holds.
If I unplug the o2 sensor, it'll drop back down to a stable 10ma. Plug it back in, and it slowly goes up to 20ma again.
So I set the mixture based on o2 readings (via voltmeter). The best I could do was around 0.7v at idle. The smallest turn lean will result in the reading going to 0.1v.
Revving it in neutral, I'll see the o2 sensor lean out, showing 0.1-0.3v. Exhaust smells real lean as well.
For the time being, I've unplugged the o2 sensor for her. Obviously, it won't pass smog as is.
Basically, with the o2 sensor plugged is, the ecu responds the same as if the lambda wire was grounded out. I'm getting about 0.55v from the ecu lambda wire to ground.
Bad o2 sensor?
She's not interested in really spending any money at all in the car. As is, she needs a new battery. It's losing coolant and oil out of everywhere. Lifters clacking something fierce, even topped off with 20w50. If she can get it to pass smog on the cheap, she'll keep it. Otherwise, it's probably back to GM for her.
She's trying to pass smog at the moment, and it's running pig rich. So I watched the DPR from a cold start. Everything is normal, slowly dropping down to 10ma. Then it oscillates around 10ma for few seconds, and then climbs up to 20ma, where it holds.
If I unplug the o2 sensor, it'll drop back down to a stable 10ma. Plug it back in, and it slowly goes up to 20ma again.
So I set the mixture based on o2 readings (via voltmeter). The best I could do was around 0.7v at idle. The smallest turn lean will result in the reading going to 0.1v.
Revving it in neutral, I'll see the o2 sensor lean out, showing 0.1-0.3v. Exhaust smells real lean as well.
For the time being, I've unplugged the o2 sensor for her. Obviously, it won't pass smog as is.
Basically, with the o2 sensor plugged is, the ecu responds the same as if the lambda wire was grounded out. I'm getting about 0.55v from the ecu lambda wire to ground.
Bad o2 sensor?
She's not interested in really spending any money at all in the car. As is, she needs a new battery. It's losing coolant and oil out of everywhere. Lifters clacking something fierce, even topped off with 20w50. If she can get it to pass smog on the cheap, she'll keep it. Otherwise, it's probably back to GM for her.
