Hey guys I have a 98 GSR, all stock other than header and test pipe, and i am having some problems with it. My idle is messed up. Itll idle around 1500 on start up, then when it starts to warm up it'll drop to 750 like normal, but then after about 30 seconds it'll jump up to around 1500 for around 5 seconds, then down to 500 and right back up to 750. Im sorry if this is confusing but i couldn't find an easier way to describe it. Also my car will not run with the iacv valve unplugged. ive bled the coolant system so no problems there, and changed out my iacv with a known good one and it still has the same problem. If anyone has any ideas please let me know.

 

TPS. Also clean you IACV and FITV.

 

so it only does this on start up, then everything's normal? or does it keep loping?

 

It keeps loping even after starting but only every once in a while. And I've already changed the iacv valve with a known good one.

 

i'd lean towards a vacuum leak. especially since it dies with the iacv disconnected.
check for vacuum leaks with a can of quick start.

other possibilities are engine coolant temp sensor. you can test resistance of it first cold, then hot. see if it falls within spec.
another possibility is the fitv. test/clean it.
also, check ignition timing

 

I believe OBDII teggys do not come with FITV, automatic integra's have a FITV though. How long did you let it bleed out for? Mine took long as 30 mins AFTER running operating temperature to fully finish bleeding.

Check your tps as stated above, you might even have a bad thermostat.

Most likely sounds like a vacuum leak. Do a vacuum leak test, some shops do it for free.

EDIT: Is your car pulling any codes? You did not say if there were any.

 

^^^ahhh yes. forgot it's 98. no fitv. pcm uses the ect sensor, among others, for fast idle

 

Ok, so i replaced the tps sensor to no avail, the only code it's pulling is for the cat. I tried bleeding mine for about 15 minutes but then it just started boiling and spewing everywhere, i live in ohio which is very very cold right now, and ive never overheated. I don't know what this boiling over means? Any ideas?

 

vacuum leak check?

 

What code is it pulling for the cat? 15 mins is not long enough. Its not so much as trying to get it to warm up, its trying to get the coolant to circulate throughout the motor so that all the air bubbles escape and don't re-enter. When it starts going down you will need to fill it up just a lil not so that you cannot close the radiator cap without overflowing.

When your fans turn on your car is about normal operating temp. Bubbles still appear aroung this time. Make sure you have the heating system at full blast on HOT air so it will help circulate better. Try doing it in the garage with the door opened just a little so you don't get carbon monoxide poisoning.

Get a overleak bottle (something like that) so that you won't over boil or your coolant won't boil out of the radiator. Patience is the key here.

 

pull a vacuum hose off, if nothing happens, its a vacuum leak. if it idles even more erraticlly, no vac leak... look into something else

 

then whats wrong with mine, it will idle surge 700-1400 every now and then, but it will only surge 3-4 times then idle high for 1 second then drop to normal..should i check my ficv?

 

if it happens from a cold start, ficv would be a good start.

 

yea, i saw ericthecarguy said just open it up and title back down the little plastic ring just enough and that should help it

 

ericthecarguy lol thats my mans no homo... hes given me plenty of helpful tips

 

but if there were a vac leak, wouldn't pulling a line off cause even a greater drop in vacuum, thus causing more of an erratic idle? i've never tried that trick, so i'm not sure. but in theory, i would think it wouldn't be effective.

another trick though is to pull the intake boot off and cover the throttle body completely. if it doesn't die, it's pulling vacuum through a leak

it could also be a collapsed line, in which hunting for leaks won't help

 

you rite...

 

I have checked vacuum leaks and found none. And with the whole bleeding my system, my fan never seems to come one, but i never overheat. Also i do live in ohio which is about 10 degrees right now. So i dont know how to get all the way up to operating temp just sitting there. Any ideas?

 

Your not trying to "overheat" your car, just trying to get it to normal operating temperature.

Ohio? Then sounds like its gonna take longer to heat up. Drive it around till you see needle go up a little then park in the garage and it should heat up much faster.

Just make sure you slowly open the radiator cap. Then do exactly as i posted earlier.