Re: ke3 not going into closed loop properly (ziddey)
This is the clue. It's adapting more fuel in. This could be for a couple of reasons. If there really was too little fuel then it's trying to add more to reach stoich. If there is too much air, from say a vacuum leak or exhaust leak, then it would also try to add too much fuel. It almost sounds like the O2 sensor is not switching rich/lean. In closed loop the KE-Jet brain will deliberately march the DPR current up until it sees a switch rich, then march the current down until it switches lean. In this manner stoich is maintained. This cycle should take about 3s or so at idle. So it sounds like the O2 sensor might not be switching to rich, so the brain keeps adding more and more fuel until it reaches what sounds like a max value of 20mA.
| Quote, originally posted by ziddey » |
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. |
This is the clue. It's adapting more fuel in. This could be for a couple of reasons. If there really was too little fuel then it's trying to add more to reach stoich. If there is too much air, from say a vacuum leak or exhaust leak, then it would also try to add too much fuel. It almost sounds like the O2 sensor is not switching rich/lean. In closed loop the KE-Jet brain will deliberately march the DPR current up until it sees a switch rich, then march the current down until it switches lean. In this manner stoich is maintained. This cycle should take about 3s or so at idle. So it sounds like the O2 sensor might not be switching to rich, so the brain keeps adding more and more fuel until it reaches what sounds like a max value of 20mA.
