Question about 1993 Suzuki Sidekick

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1993 Suzuki Sidekick fast idle 3200 cold, 2000 hot. What do I check?

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Automatic idle control valve. probably sticky. might need cleaning.

Posted on Jan 04, 2017

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Older post.
actually it's many causes.
Guessing is silly , no> once you've fixed the all in 55 years.

i cant see car to fix it, so will list all possibles.
G16a is not same as G16b and not stated, 8v or 16valves.
(totally opposite EFI systems) ill guess 8v. and respond!

1: throttle cables, not set with 10mm slack, there can be 3 cables.
1: 1-a/t , 1 -throttle and 1 -cruise,1,2,3.

2: throttle plate TV has gunk under it and blocking it open. TV jam its called.

3: IAC in base of throttle body bad, or water flow not flowing in it or water never gets to 180f due to bad thermostat.
IAC is Idle air controller, or thermal cold start high idle valve. (what it does)

4: ISC idle speed controller, stuck, (2 wires valve on right side of throttle body jammed,. open, they all do that.

5: vacuum leaks. (takes hard work to find them all)
6: hacking, someone played with that air bleed screw, the bad guy. or worse can advise here.

7: the 8v TB has a Dashpot vacuum slave there.
if it fails engine screams. for sure.
it must retract after 15sec. engine started
or its bad, 100% full retracts(eyes see it easy)

all vacuum leaks cause fast idle on all G16a made. 8v

what i do is ,defeat IAC/and ISC (hoses pinched )
and if idle drops to 400-500 they are bad.
if idle races now, its got for sure Vacuum leaks.
bad hoses, or even that brake booster can leak.

Example 1: 8valve EFI TBI injected.
the method to find this is a bit complex.
vacuum leaks ARE. that.

I toss coin
do i blame vacuum or TB first.? (mythologies)
say coin lands on TB.
Throttle body.= TB, will use TB now)

i look in air horn (TB main opening)
TV 100% closed, ? it must, cables loose good.
TV means throttle valve brass butterfly plate.,
then i pinch the ISC air hose, races now?>
(no? then , ISC is stuck) clean it ?

yes races, i then block the IAC air ports(ask for photos ,have 1000s)

race now? no, IAC is bad, for sure, or water not hot or blocked water hose or thermostat bad, and water is 145f temp. oop, it's a Thermostat bad.
one guy had the hose blocked, found IAC hoses cold.
ALL G16a race of water never gets hot.
ALL DO. the coolant must reach 180f hot and hold. (IR gun thermal tests easy check)

races now Iac ok,? yes, with IAC tested good.,.
we now know TB is OK. so.........

you have vacuum leaks.
we now know the TB is not the CAUSE
it's below. in the vacuum plenum side leaking.

(we might use the smoke machine now but takes super skills to uses, we have those skills)
(knowning what leaks normally is tricky , ask)

1: we do the hose pinch test.(for RPM Drops)
we pinch all hoses, every one but the FPR hose
and the MAP hose. and DP hose,
those hoses are hand vacuum tool tested.
and map tested same way for leaks,
DP tested for leak down.
no vacuum hose can leak end to end, that means
the objects on the end too.
Brake booster can not leak.
ok all that passes, hose and friends. ok.
what can it be now, yes, the hard row to hoe.
called gaskets. (tb base and manifold>head)

lots of gaskets, if you get this far, the gaskets are bad.
8v only,
if you have 16valve, longer posts.
16v is MPI with 4 injectors(yes they can leak air too)

see?,no guessing only testing.

Posted on Mar 13, 2017

  • 1 more comment 
  • _-__-___-_
    _-__-___-_ Mar 13, 2017

    the real suzuki forum we have a post for all 30+ ways this can fail.!!
    is your engine with a black steel top
    or silver, aluminum top "16 valves"
    cast in to valve cover.,
    we can not guess engines. ever.
    but is one of 2 in usa. for sure.

  • Anonymous Mar 13, 2017

    with photos

  • _-__-___-_
    _-__-___-_ Mar 14, 2017

    OP learns EFI is not simple
    it's not your Fathers, 1960 Oldsmobile,
    not in the least.


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  • 469 Answers

Automatic idle control valve. probably sticky. might need cleaning. Computer Mouse Slow Mouse Reaction AmanStino

Posted on Jan 04, 2017

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1 Answer

Fast idle cold to hot

to fast hot and too fast cold that it?
well here is normal, its a G16 engine, a Vitara with Sidekick badge.
G16 in cold weather, start and race idle at about 1500 rpm
or more if in ALASKA, you never said that or how cold it is.
the IAC valve is thermal, it and opens more colder, a fact.
the 8valve engine (black steel top) is faster. cold idle
then drops in a few seconds, to 1500rpm
at this time, the ECU brain does NOT control idle speeds at all.
the the engine warms up by virtue of the thermostat
as it warms to 150F to on way to 180f stock temp.
the ECU then takes control of the idle speeds.
got that so far?
so at 180f the idle is 800 rpm (800 is hard coded in the ECU,
ad ECU regulates this, unless you turn on the A.C , and if that happens 1000rpm is called up.
if not the ECU cant control it or the ECU is in limphome mode or worse.

if you insert the diagnostic jumper
does the CEL lamp flash 12s
it must.
see this paper clip this is your only scan tool.
it is crude but that is all you get until 1996.

Jan 04, 2017 | 1993 Suzuki Sidekick

2 Answers

93 Sidekick 1.6 16v fast idle cold to 3200rpm hot 1500 to 2200rpm

Check that throttle linkage isn't sticking or bad return spring. Spray lube the linkage if sticking. don-ohio

Jan 04, 2017 | 1993 Suzuki Sidekick

1 Answer

A 89 suzuki sidekick ideal fast when cold when it warm up ideal slow down is this normal

Yes you car chokes itself and runs more gas and less air as the air expands more when cold which makes your car idle higher if it didn't do this it would actually die.

Dec 13, 2013 | Cars & Trucks

1 Answer

Engine idles high cold or warm. I have checked the crank key-way and all is good.

too fast idle. it is too high right?
but how high? the 4wd model has
a dash tachometer. post that reading.
this has long list of cause.
The hot engine ,idles at 800 rpm A/C off.
the ECU controls that, if it dont idle a 800 hot.
then , : (im skipping cold due to harder to diagose and rpms not stated)

1; Is the coolant temp,
180F min, to 200F max , is it?
if not all EFI cars fail idle her.e.
2: next, is IAC or ISC failure.
the IAC must only be open cold.
the ISC is electric and operates under ECU control
and a 2 fast idle means the ISC has lost control.
it can lose control any time you have air leaks in the intake.
the main page on idle is here

the 98 specific page is here26 ways to fail. here.

even a loss distributor base clamp (bad service)
can cause idle to fail.
1: ISC(electric) dirty, clean it.?
2: bad thermostat.
3: IAC (a pure thermo device) stuck open. (my 96 was)

Sep 12, 2013 | 1998 Suzuki Sidekick

1 Answer

Engine idle speed

state a question, that is a statement.
is this a:
1: idle too fast or slow.?
2: idle not right speed, cold or hot.?
3: i want to change mine, hot or cold or both?

May 03, 2013 | Suzuki SX4 Cars & Trucks

1 Answer

When car is cold idle is fine when car warms up it keeps stalling

Sorry no solution; however, I have the same problem Wondering if you resolved yours and how


Sep 11, 2010 | 1993 Suzuki Sidekick

1 Answer

I have a 1987 Susuki Samurai, 1.3 engine. Cold start is idles at 2000 rpm up to 2200 rpm. Is this normal? Its seems a little fast. How do you adjust the cold fast idle speed? Thanks, Randy

Yeah it sounds kinda high. There is no adj except for the idle screw on the throttle, the computer does the rest, if it has one. If not, then you can adjust it some how. If carbureted, check for 2 little screws in the front, and check the choke, If throttle body, then just the idle screw, the idle should be around 1000. Hope this helps.

Jul 03, 2010 | 1987 Suzuki Samurai

1 Answer

1993 suzuki sidekick 4 door has a rough idle. all 6 injectors are fine. problem is worse when engine is cold . Problem is also worse when the engine is warm and the air conditioner is on.

Check or change plugs and wires, and check timing. Aim a timing light at the mark on the crank. If the mark jumps around, your belt has slipped.

Nov 27, 2009 | 1993 Suzuki Sidekick

1 Answer

Idle 1993 suzuki sidekick

replace the o2 censor,located in exhaust header pipe

Mar 14, 2009 | 1993 Suzuki Sidekick

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