millenniumtree
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| posted on 29/3/06 at 07:56 PM |
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Sticky throttle
1989 Civic 1.5, Fuel Injection.
Doesn't happen so much when it's cold... And only gets bad when I've warmed it up, shut it down, then started back up again. If it
warms up without a shut-down, it seems OK mostly.
Pulling up on the accelerator pedal brings it back to idle.
It's not terribly serious, because it doesn't go crazy, just a bit of a high idle. Enough to slowly travel around by slipping the clutch
without pressing the accelerator. (good for parking lots, but still quite annoying)
It's got 134,000 miles on it. It seemed to happen a few weeks after replacing the head gasket, which involved taking off the intake manifold.
Replaced a few gaskets and o-rings in there too. Any ideas?
I oiled the little half-wheel that the cable tugs on, but it is still doing it.
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britishtrident
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| posted on 29/3/06 at 08:54 PM |
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Hondas are very prone to throttlebody gunging --- good spray with carb cleaner and rub with an old toothbrush also unbolt the idle control valve and
give it the same treatment.
Do a google it should come up with full instructions -- loads of Civic sites on the net.
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iceman26
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| posted on 29/3/06 at 09:18 PM |
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check vac hoses and the 1 way valve in the vac hose this can cause this problem
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millenniumtree
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| posted on 5/4/06 at 07:46 PM |
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Fixed!
Here was the clue:
"Pulling up on the accelerator pedal brings it back to idle"
I should have realized that meant the problem was somewhere in the linkage.
There was no slack on the pedal AT ALL, so as soon as my foot touched the pedal, the revs would increase...
The cable had been adjusted improperly somewhere along the line (probably in all my fiddling with the intake manifold, head gasket, etc.) So I
slackened off the cable slightly and whammo, no more sticky revving.
Thanks guys for the tips. However much I wanted to rip open the intake manifold (again), I'm glad I didn't have to. 
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