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Old 10-17-2010, 06:23 PM
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I have a 98 jetta 2.0 and i just replaced the pcv valve. When i did this i removed the valve cover to replace the pcv. i went through and completely cleaned everything the air filter(K&N), MAF, throttle body and the top part of the intake manifold. All of the gaskets were replaced. When the car starts the idle will go to 1500 rpms and then will slowly make its way to about 900rpms. when i drive the car and push in the clutch the idle will go to 1500 rpm and will stay there untill the car stops moving. When it stops the idle will slowly make its way to 900 rpm. Does anyone know what is causing this problem?

Also the car had some problems with the idle before this work was done , actually i was hoping what i did would fix it. After long trips the car would idle rough when started after the trip. Rough enough to make the CEL go off. the idle did the same thing described above but the idle would start at 1100 rpms not 1500.

Does anyone know what is causing this problem?
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Old 10-18-2010, 09:31 AM
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Try cleaning your idle control valve. There may be debris inside that is causing your idle to stick. Its an easy job and only takes 15-20 minutes.
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Old 10-18-2010, 08:15 PM
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Actually my jetta doesnt have an IAC valve. I was able to fix the problem. I simply disconnected the battery cables and the touch both the cables together for about a minute then reconnected the battery. After that the car idles perfectly. I spent alot of time researching the problem on the internet and on this site and it seems like the problem I had is common after someone cleans their cars throttle body. So if anyone has the same problem with a high or fast idle after cleaning their throttle then they should give what I did a try.

Thanks for the reply JettaSetta.
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Old 10-18-2010, 08:46 PM
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you might have messed up your throttle butterfly valve positoning when messing with the intake. This can cause an erratic idle.

You need to check all of your vacuum hoses too.
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Old 10-18-2010, 10:27 PM
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Mine does the exact same thing but im really not worried about it. Mine doesnt quite go as high as 1500 RPM. Its not big enough of a issue for me to be bothered.

And why did you remove the valve cover to replace PCV? Its not needed.
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