the car will run with a packed up PCV valve, (oil leaks spring out)
if cracked it sucks in dirt. THE PCV is not it. unless the valve it self is split in half.
fast idle is easy to find.
1: close the idle stop, screw, (see air gap it closed)
2: Dash pot not active (look)
3: block isc, , still race now. not isc or ecu influenced.
4:block the IAC with clah.
1,2,3,4 do so sequential , stopping up each normal path,you do..
if it still races?, you have an intake manifold leak, for sure.
racing means over 800 rpm hot,
yes clay i use, but be creative, rolled up duct tap wad, what ever works
i have box of small rubber corks, and vast numbers of vacuum line caps.
yes, add them up. ( do you want to know why its leaks ? only testing finds that)
not $1000 in parts, it can be something dump, like the P/S over load wire grounded out. find the cause then fix that. guessing rarely works on old cars.
close the throttle plate, 100% , you can view it with a flash light, sure can..
100% , you said it races closed, that is a hard fail.
so, leave it closed
and pack the ISC closed, make it so the path is BLOCKED, its just a simple air valve. (leave it like that packed, then...)
last pack up the IAC.
at the end, all sources of air are gone and plugged, etc. ( a goal)
or if the idle goes to 400 or zero.(stalls) which ever happens first?
make your own gaskets. Napa sells the raw supplies.
that gasket will be destroyed after a 20 long year, planted and cooked.
sure will, but luck happens.
i guess you never called suzuki before?, and asked for a part.?
they have them and no , this car most parts are not sold. (after market new)
like custom fit hoses. as you mentioned.
i can get the numbers and we can look them up for available. (ok i did)
yes, find one bad MAP in 4 years here, lots changed, not one proven bad.
its very rugged, it is. last one was broken down the back side, so can blame it or
that. its easy to test with any voltmeter and a hand tool ,easy and proof of working corrctly.
the o-rings can fail at anytime, all those can be had. there are sources.
good a real code 2 Canada car. from Cami ,not japan. good.
this car is old. you wont find throttle bodies in Autozone.
we can find used parts here, and at car-parts.com and ebay and craigs.
i bought whole assemblies cheaper like a whole induction system.
but if the wrecker removes 1 part its like gold to them. oddly.
there are no parts on this car that are optional , under hood.
sure a noisey ISC can be ignored.
or as some do block paths for ever. in the TB.
how you fix any car is you call, hack, fix, new,,used, rebuilt. or ?
each has a cost and down time.
one guy here, had a leak (fast idle post of 1000s)and after 50 posts the photo of a cracked in half EGR
remember we are blind here, cant see the obvious;at all. not ever.
it's pretty much for sure after 20 years, all gaskets are bad and 0-rings
or just waiting to crack , at the slightest touch. all cars.
it's called atrophy.
one company still sells the body gasket kit, SMP does.
suzuki does. but not the center piece.
the key parts are
the injector, there is a great injector cleaner service for $20 and comes with
the vary hard to find or-ings. witchunter.com (rockauto has thees rings too)
ISc bad, is expensive, find one on fleabay
TPS bad, good luck finding good used one. hard. and are like $200
but all parts are scrounge-able.
Fpreg is easy. sold all over.
have you ever looked at rockauto.com?
have you looked there under Air/fuel.
$192 ISC. (tb right side , 2 wires) (i bet your's is good, if not jammed or open coil)
fixing cars is easy finding parts , no so..... (not fast)
the hoses near the TB. are very hard to source ,read the TSBs for 89/90
and the revised them many times.
but the 90 had 2 PCV hose sets one a Y mold and one with metal Tee pipe
i looked those 2 hoses at suzuki now, and both show up. and are $23 or one and $6 the other, then the IAC 3 screw gasket
that one is $5 pn 13442-61A00 ,
so they have the parts. at suzuki, only it takes 3 extra days to get them.
ok , time to sleep.