Question about 2001 Volkswagen GTI

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Erattit Idle ansd Loss of Power

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?

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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

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Hi,
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.

Cheers, D.

Posted on Jul 11, 2008

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HOT and cold engine,
Is hot idle speed RPM right near 800 and steady,not racing fast?

power loss, is the CEL lamp glowing running, yes,scan it.
post engine type exactly. one of these?
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Hello and welcome to FixYa!

If that's the case then the problem will be on the MAF (mass air flow) sensor. If the MAF is faulty the car tends to loose power and erratic idle may occur. One good reason why you are having this issues. I strongly suggest that you have it replaced to resolve the problem.
Hope this helps and thank you for using FixYa! Have a good one!

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