The car i have ticks over normally but then drops to nearly stall, then revs back up to the norm. and does this constantly. even if you rev it up to say 5000 rpm, it still does it. I have changed,
idle control valve
any help would be great.
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Re: 94 L reg clio 16v 1.8 tickover irregularities
Sounds like idle air control valve sticking. If i remember correctly, the idle air control valve is built into the throttle body. This is the part that connects between the air filter and inlet manifold. take this off and clean thoroughly with carb cleaner. if this does not work, then renew part.
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You can in most cases repair this by cleaning the engine throttle valve and the idle speed control valve using a product called CRC Spray Throttle valve cleaner. Spray the cleaner into the air intake of the engine with the hose removed from the throttle body, the engine will try to stall so hold up the idle speed manually. Once you have used up about 1/2 can of the cleaner stall the engine out while spraying and turn the key off, disconnect the negative battery cable for 5 minutes and then reconnect and drive the car for a about 25 miles of varied driving modes. If this doesn't cure the problem you may need the fuel injectors professionally cleaned by the dealer service dept.
the engine tickover is too slow when the engine is cold its running on cold start, ie:choke,, after it warms up the engine slows down this is what is causing it to stall in gear,, get some one to hold the brakes hard on and with the engine running in gear ajust the tick over till its reving at 750 - 850 rpm the revs will go up a bit when its out of gear,, before you pick a gear to go into push the foot brake down to stop the car lurching,,,
Well the same thing happened to me a few months back with the exact same car but what i noticed was when i was changing the spark plugs one of the HT leads had come off the spark plug so i fitted new spark plugs and re-fit the HT leads properly - Problem solved :D