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2004 Megane erratic idle & over revving

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Old 18th June 2011   #1
bloobloo
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2004 Megane erratic idle & over revving

Hi everyone. As the title says I have a problem with my wifes Megane over revving and erratic idle. I have took off the throttle boy and given it a clean, but noticed that the throttle itself doesnt close fully. How are these throttle bodies meant to be? I have put it all back together and it still has the same problem, but also noticed that if i manually turn the throttle with the tip of a screwdriver i can stop the erratic idle. It seems as if the motor on the opposite side isn't actually closing the throttle enough. Will this be the problem or is that how it is meant to be?

Kind regards

Mike
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Old 18th June 2011   #2
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Re: 2004 Megane erratic idle & over revving

I'd imagine it should not completely close or you would get no air to the TB.

If it is over revving, then it is getting too much air, check that there are no leaks prior to the TB.

It is possible that your MAP sensor is busted, worth getting checked.
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Old 21st June 2011   #3
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Re: 2004 Megane erratic idle & over revving

Quote:
Originally Posted by ourcar View Post
I'd imagine it should not completely close or you would get no air to the TB.

If it is over revving, then it is getting too much air, check that there are no leaks prior to the TB.

It is possible that your MAP sensor is busted, worth getting checked.

Hi, I have done a search over the last few days, looking for info on why my Megane is over revving and surging at idle.
Up to now I have found various posts but none that are the same prblem as mine, or that have been solved.
When the car is started, the car idles around 1600 - 1800 rpm, no misfires or any other problems. Once driven the car still idles at high revs, but also surges from 1000rpm upto 2800rpm.
So far I have removed and cleaned the throttle body, checked and improved the throttle body to manifold seal, tried a different MAP sensor, tried a different set of coil packs, checked for any other air leaks on the intake system. All to no avail.

I have ordered an ELM 327 diagnostics able and software to check any fault codes and that should arrive tomorrow, my galletto arrived today!

Any help greatly appreciated

Forgot to mention its a 2004 1.4 16v megane, 54,000 miles

Mike
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Old 21st June 2011   #4
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Re: 2004 Megane erratic idle & over revving

Did you replace the seals that go between the upper and lower inlet manifold?
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Old 21st June 2011   #5
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Re: 2004 Megane erratic idle & over revving

No, I took out the seals and gave them a good clean. The first time i took it apart I used a gasket sealant but that made no improvement. I then went to the breakers yard and got another inlet manifold for 4.00 just in case the other one was cracked etc. I then took off the 1st inlet manifold, scraped and cleaned all the other gasket sealant off the lower inlet and replaced the top manifold. I will order new seals tomorrow and try that.
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