Question about 1988 Volkswagen Cabriolet

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Fast idle idles fast around 2000rpm from cold start to warm-up it never idles down

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  • Anonymous Mar 23, 2014

    Warm hard to start ,fast idle

  • Anonymous Mar 25, 2014

    it has just started doing this idles at 1500 revs

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I have a similar problem which seems to stop ,if after 20 mins of driving or warmed up engine if you stop for 10 mins the revs die to a more normal 1500 revs! it is a spanish car now living in theUK I think the problem is choke related.

Posted on Dec 14, 2008

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Not an uncommon issue for one to idle fast while cold but , 2000 rpms is a little higher than normal. May want to check the engine coolant temperature sensor for proper voltage and the coolant level. Also, check for small vacuum leaks around the throttle body gasket.

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It likely has EFI (electronic fuel injection) and an idle air control valve that regulate idle speed. They can get gummed and fail to have a fast idle when cold, or get stuck the other way, and have a too fast idle all the or regularly take its time slowing down after you take your foot off the gas. An engine temp sensor can also cause a lingering high idle if it reports the engine as still being cold after warm up.

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My 1994 samurai idles really high when I first crank it, but later slow down. is there anyting I can do to ?


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Hi there,

When cold, modern EFI engines are designed to idle higher, until the engine warms to operating temperature. The idle should then return to around 700rpm.

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In this case, your vehicle's computer will have stored the appropriate fault code/s. Have your codes read by your local Renault dealer to determine which circuit is the cause.

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When I start the car it stays at 2000rpm for a few moments then drops down. I'll drive for a few minutes then put it in park and it revs up and down.


idle air control valve is bad replace it. at start up choke control runs till warm up while driving throttle opening controls engine at idle ,the idle air control valve.

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maybe slow,cold start,air control valve or,possibly normal for temp in morning,I live in Australia and cars can take ages to slow down in winter eg1 to 3 deg cel...and very quickly warm up in summer..eg....idle slows down in 1/4 time,have a look at the car if you can park it in warmer conds... to see if its quicker as Toyotas do this normally for fast warm up,lastly has it been well serviced...looked after??

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You need a 10 mil and 8 mil spanner, carb cleaner and mabie some wd40.
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remove the battery negative terminal and leave it off for 30 minutes, this will reset the ecu to factory settings.

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THE COOLANT LEVEL IS LOW

on the older hondas even the newer ones idle speed is coolant temp controlled.

when the engine idles up the electronic coolant temp sensor is submerged in coolant and reads warm, so the engine computer idles the car down. the coolant level if low than drops from around the coolant temp sensor and it says the engine is cold, so the engine computer idles the car up.

which results in the constant rise and fall in engine rpm.

ADD COOLANT TO THE RADIATOR AND WATCH THE CAR MAGICALLY FIX ITSELF.

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