Finally got the old heap back on the road but the MOT tester said there was an issue with emissions - rich at idle and lots of hydrocarbons, he let it go anyway as he said it wasn't a prob for a jap import and especially at that age. He did say it had a prob of some kind though to make emissions that bad.
I've been messing about with it this evening and found a couple of things which I'm not sure about, the AAC is reading partially open all the time and varies with RPM - is this correct? Secondly, the MAF is usually around 1.26V at idle but occasionally dropping to zero volts.
I'm pretty sure the MAF is ok as the car still revs ok, is an occasional zero reading to be expected?
Last thing, I logged the boost curve as I suspect I may still have a leak somewhere, I've not attempted 1 bar yet as I need to set the car up properly first. For a constant throttle setting the boost ramps up ok, levels off and then begins to drop gradually. Is this normal behaviour? If so I can compensate for it with an increasing duty cycle v RPM, or is it indicative of a boost leak?
Finally got the old heap back on the road but the MOT tester said there was an issue with emissions - rich at idle and lots of hydrocarbons, he let it go anyway as he said it wasn't a prob for a jap import and especially at that age. He did say it had a prob of some kind though to make emissions that bad.
I've been messing about with it this evening and found a couple of things which I'm not sure about, the AAC is reading partially open all the time and varies with RPM - is this correct? Secondly, the MAF is usually around 1.26V at idle but occasionally dropping to zero volts.
I'm pretty sure the MAF is ok as the car still revs ok, is an occasional zero reading to be expected?
Last thing, I logged the boost curve as I suspect I may still have a leak somewhere, I've not attempted 1 bar yet as I need to set the car up properly first. For a constant throttle setting the boost ramps up ok, levels off and then begins to drop gradually. Is this normal behaviour? If so I can compensate for it with an increasing duty cycle v RPM, or is it indicative of a boost leak?
Cheers
RobH