Question about 2001 Volkswagen GTI
Golf GTI 1.8T 20V 150Bhp 2001
Suffering from erratic idle and loss of power. Got worse to the point that the engine would almost stall. Plugged out the Mass flow sensor and the engine ran perfect. ASR light and Engine Emissions light came on. Installed new Mass Fow Sensor and the problem improved significantly but is still not running as smooth as when it was plugged out. THe ASR light went off but the Emisions light has remained on.
Has anyone any suggestions as to what the fault could be? What is my next move?
Try cleaning out the throttle body located to the front left in the engine compartment. It has a big rubber pipe attached to one end and the engine on the other. Remove big pipe, undo four bolts, hose on top and electric plug to rear. Remove the whole unit from the engine. It will be full of carbon and oil build up. Use a degreaser to clean it (I used WD40) pay particular attention to the rim of the circular valve (you can open the valve by hand to clean). It is the gap between the valve and its outer (when closed) that needs to be clear for the engine to breath when idle. If the valve wont open smoothly because of deposits this can also cause power loss.
You probably need to reset engine light.
Posted on Feb 22, 2009
I think the only way forward is to get the fault codes read, cleared, and then read again to see what is currently wrong. I'm not a petrol engine wiz but some people have put leaded fuel in a car designed for unleaded, and that has degraded the lambda sensors, which then messes up the timing and mixture as the computer tries to correct something which isn't wrong.
Hope this helps. If this "fixes ya", I'd appreciate a rating for my reply, If not, please delay the rating and add a comment with any extra info you have and I will try to think of something else.
Posted on Jul 11, 2008
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Posted on Jan 02, 2017
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