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Old 10-22-2015, 10:42 AM   #1 (permalink)
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Unhappy high idle

o5 alto 1.1 engine.
runs great but idle 2000rpm
seems to be sucking air through idle hole in throttle body at an extreme rate.part blocking hole reduces tickover but now i have to wait for engine to warm up before idle is stable
any ideas
replaced throttle body but exactly the same.
dont know how to edit last post
thanks
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Old 10-24-2015, 08:53 AM   #2 (permalink)
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Sorry for the lack of response, but there doesn't seem to be many Alto owners on here and for what ever reason very little information on the net about them.

Can I assume the replacement throttle body came with the idle air valve fitted rather than swapping yours over. Can't really think of much other than see if it's throwing any codes.
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Old 10-25-2015, 11:42 AM   #3 (permalink)
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Quote:
Originally Posted by cjswan View Post
o5 alto 1.1 engine.
runs great but idle 2000rpm
seems to be sucking air through idle hole in throttle body at an extreme rate.part blocking hole reduces tickover but now i have to wait for engine to warm up before idle is stable
any ideas
replaced throttle body but exactly the same.
dont know how to edit last post
thanks
Hi there,

Mine is the same, idles at high revs on first start(haven't looked how much), I thought it was running fast to get to optimum engine temperature quicker which is what an engine wants and is supposed to do with thermostat closed and high revs on initial start up??

OR a problem with Air flow meter misinforiming engine of air but I think the high revs is normal, coinsidence mine does the same!! Textbook ish answer would be when it's cold, combustion requires much more fuel in the ratio because it does not sufficiently vaporize from liquid gasoline into a gaseous form (liquid gasoline, for the sake of this discussion, does not burn). The problem is, too much fuel through the engine at a low speed bogs down the engine as the unburned liquid fuel will kill the spark and cause it to stall. The RPMs are bumped up to push this fuel out more quickly until a more desirable temperature is attained. Once warm enough, the fuel vaporizes as it should, the computer dials back the fuel mixture (or the carburetor opens the choke) and the RPMs can come down. Thermostat opens and allows coolant to circulate for cooling, hope that makes sense.

Sorry if I have misunderstood your query. Thanks John

Last edited by Hendred; 10-25-2015 at 12:04 PM.
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Old 11-12-2015, 07:28 AM   #4 (permalink)
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hi thanks for replies all electrics were on throttle body, no codes thrown up . revs do not alter when warm thanks
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Old 11-12-2015, 07:29 AM   #5 (permalink)
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hi thanks all electrics changed with throttle body and no codes thrown up
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