Question about 1993 Suzuki Sidekick
Automatic idle control valve. probably sticky. might need cleaning.
Posted on Jan 04, 2017
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.
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
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Posted on Jan 02, 2017
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