motsco_ wrote:
> Gib Bogle wrote:
>> For some time my daughter's 1985 Civic SI has had an intermittent idle
>> problem, and now it has become much worse, to the point that it can't
>> be ignored. At idle the engine speed cycles up and down between about
>> 1000 rpm and 2000 rpm, about twice a second. It is almost as if the
>> engine cuts out when the revs get up to 2000, then cuts in again when
>> it drops below 1000 rpm. Now the condition seems to have become
>> permanent (funny how problems like this never seem to get better) and
>> it affects low speed driving, e.g. in heavy traffic. While driving if
>> the revs are about 2000 with little throttle the engine does the same
>> cycling, making driving very difficult (once was enough for me to
>> convince myself not to do it again).
>>
>> Perhaps someone can tell me what is likely to be the problem. Does
>> something need to be cleaned, or is it a matter of replacing a sensor
>> or valve? Otherwise this car still runs very well - very s****ty - and
>> I'd hate to junk it. Thanks in advance for all suggestions.
>>
>> Gib
> ----------------------
>
> First thing to check for AIR in the cooling system. Top up the reservoir
> and the rad, then do it again next morning (cold engine). The engine
> uses hot coolant so set various functions and the idle is one of them.
> Use premix coolant, not tap water.
>
> Re****t back.
>
> 'Curly'
Thanks Curly. I will re****t back, but it will be a few days before I
have time to try this.
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