Mk2 1.8 idle drop
Discussion
Some may have seen me post before about this but I haven't been getting anywhere. Been driving the car with this problem for 6 months or so now and it's no massive issue, mechanic says the car looks just as solid still - but it's annoying. I have a problem where when slowing and revs falling (i.e. not in gear basically) the rpm drops to around 400/500rpm before boosting up again to where it should be around 800 (give or take 50 either side). Almost like it's about to stall, although it never does.
I've had it in the garage and checked all the hoses but doesn't seem to be an air leak anywhere. Also replaced knock, cam, crank and MAF sensors.
Final thing I've done is followed this guide to set the base idle.
It seemed to be a little low, so I upped it - but the idle kept dropping down to around 500rpm for a second then back up to where I set it at about 800rpm for 7 or 8 seconds, then back again for a second and so on. No idea what could be causing this but it seems the idle drops even when trying to set it's base setting. Any further ideas of what this could be?
I've had it in the garage and checked all the hoses but doesn't seem to be an air leak anywhere. Also replaced knock, cam, crank and MAF sensors.
Final thing I've done is followed this guide to set the base idle.
It seemed to be a little low, so I upped it - but the idle kept dropping down to around 500rpm for a second then back up to where I set it at about 800rpm for 7 or 8 seconds, then back again for a second and so on. No idea what could be causing this but it seems the idle drops even when trying to set it's base setting. Any further ideas of what this could be?
You could try cleaning the Mass Air Flow sensor.
Just give it a quick spray with some Air Sensor Cleaner. You can get a can of that for less than £5.
E.g.
http://www.motoelectrical.co.uk/crc-shop/crc-air-s...
Just give it a quick spray with some Air Sensor Cleaner. You can get a can of that for less than £5.
E.g.
http://www.motoelectrical.co.uk/crc-shop/crc-air-s...
Just bought a Mk2 1.8 for some summer fun (and a couple of track days). Different issue but idle related....
Cold start idles at 2k revs. After a run or go near the throttle car idles at 1600rpm. If I leave throttle alone for 20 seconds it'll drop and sit at circa 900rpm. Car pulls cleanly. Doesn't chunter in town, hasn't yet stalled. Just annoying as I roll to a stop and it sounds like Ive still got my foot on the accelerator. Any easy solutions?
Cold start idles at 2k revs. After a run or go near the throttle car idles at 1600rpm. If I leave throttle alone for 20 seconds it'll drop and sit at circa 900rpm. Car pulls cleanly. Doesn't chunter in town, hasn't yet stalled. Just annoying as I roll to a stop and it sounds like Ive still got my foot on the accelerator. Any easy solutions?
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