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I have a 2003 megane cabriolet that has not been driven more

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Hi I have a 2003...
Hi I have a 2003 megane cabriolet that has not been driven more than 50klms in 3 years (been in storage). Started it a couple of weeks ago - running rough, replaced 4 coils. Drives fine but is idling high, around 2200rpm when in park or neutral. Wondering if it is the idle control valve or throttle or something else?
JA: Does the engine turn over? How old is the battery?
Customer: Yes, drives fine. I replaced battery as well.
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Yes, I've already written what I've done
JA: Anything else you think the mechanic should know?
Customer: I don't think so
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Renault Mechanic about your situation and then connect you two.
Submitted: 1 year ago.Category: Australia Car
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Answered in 1 day by:
7/9/2016
AU Auto Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Australia Car
Satisfied Customers: 23,265
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer!

It's possible that you have an idle air control issue but the throttle blade may be not be physically closing, you could have an inaccurate throttle position sensor signal, or it could be a vacuum leak. A vacuum leak is a very common cause of a high idle.

Have you checked for fault codes?

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Customer reply replied 1 year ago
I dont have access to a diag computer. Can you tell me what would be highest likelihood, then 2nd then 3rd etc? Can I diag vacuum leak without a computer and if so what do i check?
AU Auto Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Is the engine light on?

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Customer reply replied 1 year ago
No.
From cold start idles around 1100 for about 5 mins until engine warms up then all of a sudden keeps creeping up to around 2100 and doesnt drop when accelerator touched like usual..
AU Auto Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

You can check to make sure the throttle blade is physically closing and do a visual inspection of all vacuum lines to make sure they're intact and in place. If nothing can be seen then carb cleaner can be sprayed at any suspected leak areas such as the intake. If the idle changes when spraying a certain area then you've located a leak.

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Customer reply replied 1 year ago
Ok, ill give that a go when i get home
AU Auto Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Great!

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sprinkles08
sprinkles08
sprinkles08, ASE Certified Technician
Category: Australia Car
Satisfied Customers: 23,265
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Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience

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