The next thing to look for is bad vacuum hoses or components. Vacuum
leaks cause a lot of higher than normal idle problems.
-SP
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
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