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transmission/vacuum/idle problems in automatic 1986 corolla seca hatch 1.6L
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kurtis_sasagi
New User
Jul 17, 2010, 9:30 PM
Post #1 of 2
(1298 views)
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transmission/vacuum/idle problems in automatic 1986 corolla seca hatch 1.6L
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hi,
Transmission forums seemed the best spot for my problem. If any more info is needed, please don't hesitate to mention and I'll tell you everything I can. Hope you guys can help, I'm pretty car unsavvy.
I have a problem with my automatic 1986 Corolla Hatchback 1.6L.
When I start after not driving for a while, such as overnight(isn't a cold start issue), the idle will sit at it's optimal 1050-1100rpm, and gradually go down to about 500rpm after a couple of seconds. If I start just after running the car, it will essentially start at the low idle. Then, in every gear (again, automatic) when stopped it sits at a very low idle, and about half the time when i'm stopped whilst in drive with pedal brake on(eg at lights) it stalls. Note that if I'm moving at whatever speed and go into neutral, it idles low straight away too. It starts to low idle when i get down to about 1500rpm as i'm slowing down, and i've even tried rolling slow and stopping with park brake to see if it's a vacuum problem. It does the same low idle every time i slow down or am parked, without fail. The only driving solution i have at the moment is to keep my foot on the gas a bit as i'm driving even when i'm slowing down to a stop, so i have to two-foot drive. Once again, if any more info is required just ask, I'll help you help me as much as I can.
Kind Regards,
Kurtis-Personal info deleted
(This post was edited by Hammer Time on Jul 18, 2010, 1:19 PM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 18, 2010, 10:44 AM
Post #2 of 2
(1294 views)
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Re: transmission/vacuum/idle problems in automatic 1986 corolla seca hatch 1.6L
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Hmmm? The idle should be controlled even in 1986 via an IAC (intake air flow) or perhaps a motor sensing temp and load to set idle speed. Load is generally sensing intake manifold vacuum and converting it to an electric impulse to tell idle to stay proper and possibly knows the RPM it went to.
Vacuum leak possible. IAC if equipped possible. Vacuum leaks are possible as well amoung things that come to mind,
T
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