Question about 1993 Honda Civic 4 Door

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Fast Idle above 2000 rpm during warmup & electrical issue

I have a 1994 Honda civic LX with 1.5, carburetor-type engine. Two things actually: 1) the fast idle is above 2000 rpm during warm up and down to 900 rpm after around 30 seconds of warm up. 2) the stationary idle varies when electrical loads kicks in (i.e. stepping on the brakes and brake lights turn on, headlights on, AC compressor on). What could be causing these two separate problems? Beed your advise please.

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  • Honda Master
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If it's not vacuum leaks, it will be you idle control sensor.

Posted on May 08, 2009

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I have a Honda civic LX 2009 and the RPM is 700. I understand that the normal RPM is 900. What could be the reason of the lower RPM on my car? Thanks in advance for your comments


I think the idle, in gear, should be about 750 rpm, definitely not 900. If you are looking at the tachometer, it isn't that accurate visually. a scanner should be connected to get an accurate reading. A little vibration at idle is not abnormal. But you might try adjusting the engine mounts to eliminate it.

Sep 17, 2014 | 2009 Honda Civic LX

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Why a 1997 honda civic engine surges at idle


which engine, options there are many.???
cant fix any engine, until you know what it there.
a civic not Tacoma. as posted.
see end for engines ????

surge 101 (running gasoline?)
it caused by 2 things. (and lots of reasons)
1: engine running lean. all engines lean surge. fix that first.
hint use a scan tool see live data........?????
2: ISC system is faulting, the idle speed controller can fail for #1
or for itself. (it can stick) clean in.


wiki list of engines. (which one???????????????)_
The sixth generation featured engine options were available along with their first Natural Gas Powered Civic, the GX. From 1996-2000 the Civic was sold under the CX, DX, EX, EXR, HX, LX, and for Canada, SE, and Si trims; all base models were made with 1.6L engines. The EX-CX are all SOHC (Honda D engine). The CX, DX, and LX all have D16y7 non-VTEC engines; whereas the EX has a D16y8 VTEC, and the HX has D16y5 VTEC-E. The USDM Si and Canadian SiR came with a DOHC (B16A2 VTEC). The first civic SI coupe EM1 was introduced in 1999 until 2000. Europe saw a DOHC 1.6 VTI hatch and sedan and a DOHC 1.8VTI engine was available for the Domani related five-door liftback and esta
end quote.
I CAN NOT GUESS>!!!

Jul 01, 2014 | 1997 Toyota Tacoma

1 Answer

2003 honda civic lx will start but no power trying to drive down driveway and antitheft light is on


that's a good one,
is engine RPM above or below, 2000 RPM in the A/T Drive selected
if cant get there, weak engine
if goes way highter, that is transmission slip.

the RPM is key
in the FSM see page on A/T for transmission stall test
it takes 1min, to setup, pass or fail (test is 15sec. max , never more. )

Jan 15, 2014 | 2003 Honda Civic

1 Answer

Throttle surge at idol


surge, great post, what engine displacement.
open hood (my answers are USA only) look up, see big white
sticker that is the engine vacuum and type engine sticker)
surge hot or cold? engine.
if it surges hot, that means :
1: ISC system out of control , it job is to stop surge and 5 more things.
2: the engine is way lean and cause ISC to loose control

just 2 reasons, and can be 50 things. wrong.
is the CEL lamp out running> if not, pull the DTC codes and post them. (all)
as a mech ,we find out which it is.
(i make sure my engine can hold closed loop at idle , if not and lean it will surge. (may)
we make sure the ISC works ok (not sticking, clean it)
and then test to see , that if by my forcing it closed, by hand (ask)
i can get way below 800 RPM. most do 500 but 600 is ok.
if rpm stays above 800 closed, that means you have huge
vacuum leak or TV blackage (too thight throttle cable?)

finding vacuum leaks can be horrific, task .
there are many tricks (and tests) to do this, ask.

see that logic above, If I the mech, can not drop rpm below 800
by hand, then no ISC on earth can. not now or ever.
and proves the induction has huge air leaks
or some dolt set the spark timing 20 degrees advanced.
see it.
so as always , a tuneup is first, then as always , i always check timing,and for proper advance rates.
advances engines at idle race way too fast and the iSC will just go NUTS.

ISC = Idle speed controller , that valve that has wires.
the IAC is a thermal device and no wires and it too can stick open
when the IAC sticks open the ISC goes , yes, nuts,
nuts can be surge (ECU is hunting it)
or just racing way too fast hot, say 1500 rpm.
a slow RPm can be a stuck open EGR (50k service point)
lean will cause too low.
too rich , misfires and too low
the ISC is the last thing to work right, all else must be good.

what does your CEL lamp do?

PS: most cars, if the ECU/PCM enters Limphome, it cuts all idle controls. again, the CEL lamp. glowing while running.../????

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1 Answer

1998 Honda civic rising and falling idle


the timing could be off you may have to have it checked and fixed hope this helps

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I have a 1994 chevy pickup, 2500, witha 5 speed manual transmission. The idle is about 2000 RPM until warmup but is still too high @ 1200 RPM. What should i do? Note: 329,000 miles.


what engine would be more helpful. but just guessing i would say the engine is just tired and rings are worn and valves arent seating and you have a vacum causing the high idle from nothing seating properly.

Apr 07, 2010 | 1994 Chevrolet C1500

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