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Discussion Starter #1
Hi

I have a 1999 156 1.8 TS and it proved to be a real gas guzzler, it spends about 15 - 16 litters for every 100 kilometers(city). I tried all the usual stuff to fix it(new MAF,spark plugs,replacing bad thermostat, alignment...), but I didn't get an results.I've had one consistent issue that won't go away, the car when on the move and in neutral revs unevenly, it goes from 600 to 1500 rpm. I cleaned throttle body and idle control valve, and it seems to give me results for only 5-10 minutes of driving, after which it goes back to erratic idle. I think that idle control valve might be bad, but i still don't know if this is the reason for bad gas mileage...

Does anyone have any experience with this, or suggestions?
 

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Poor idle is often the valve in the oil breather stuck open.
It is located just after the throttle body.

When it sticks open it makes an uncontrolled air path that bypasses the throttle.
 

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Discussion Starter #5
Poor idle is often the valve in the oil breather stuck open.
It is located just after the throttle body.

When it sticks open it makes an uncontrolled air path that bypasses the throttle.
Is that the little hose that goes from engine cover to intake hose between MAF and throttle body?
 

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Is that the little hose that goes from engine cover to intake hose between MAF and throttle body?
That is the other oil breather.
The one with the valve connects AFTER the throttle body.
 
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