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Ian, you have been getting good advice on the other board, too. Keep in ming that 'lean to the AF meter', lean in reality and what the LH system thinks is lean can be different things depending on how good the connections are and how well the system is working. the feedback signal from the o2 is a low voltage signal and a bit of resistance can throw off the whole system. My suggestion is to diagnose the system instead of looking for a potential part to hang. Use a DVM (do not rely on the inaccurate A/F meter). The diagnosis will lead you to a fix. It may be a simple as a bad ground somewhere. Unfortunately yours is an LH 2.2 aqnd does not store codes or I'd ask what the codes are. Read out the values from the 3 pin connector that Anders suggests. Does it show the same thing you read at the o2 sensor lead (with your ground reference the battery negative post)? The LH system can only reference what it sees. If its ground reference (on the head) is different from battery negative, it will not know what to do. so in summary: check the values with the ground reference the battery negative with a digital volt meter. Look at the O2 lead and watch it from a start. it will show 0.6v then will start to oscillate. The values will go from 0.2 - 0.8 and it should have an average about 0.5. this will take either an oscilloscope or a creative 'yes, that looks about right'. Check to see what the LH thinks it sees (from the 3 pin plug in Ander's post) If they agree, the system is grounded fine and you have more work. Do this and let us know. The TPS is very easy to check (center pin to aft is idle (i think ) and the other position is WOT. You should get a continuity across 2 of the pins at idle and the other 2 at WOT. Look at the voltage of the AMM and compare it to teh LH faq. Check this to battery negative and to the ground point on the head. Are they the same?
posted by 66.245.1...
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