pssss on my ca18det

[Simon]

Hi i finaly got my car with ca18det engine (its nissan 200sx made in 1992), and i need your help. 3 days a go my normal rpm was 1500 when the car was standing and the engine was cold.Today i saw that i got 800 rpm when car stands and the engine is cold. Is it corect that i got 800 rpm ??On the left side of the engine i heare something pssssssss its an air or something i dont know what is doing that noise.( i know that there is turbo but is it working on 800 rpm??).On the right side i heare tick tick tick is it corect ?My car needs 10 min. to get his optimal temperature ( and again i dont know if it is goog or bad).Please help me becouse i dont know this car and its my first car. :help

Thx for your help:)

[themadscientist]

the ticking could be the injectors firing, Nissan ones are notoriously loud. The hissing is weird though. Your car should idle around 750 RPM so 1500 was way off. Maybe somebody set the idle real high and the hose that feeds around the back of the engine over to the boost control solenoid by the turbo popped off. That would account for the hiss and the dropping idle.

[chezina]

On a cold day the engine idles a bit higher after the first startup(@ 1300-1500RPM) for some time(at least all 3 i rode) so i guess that's normal. When the engine has temp the idle should be 850 +-50 RPM(says my Nissan Werkstatthandbuch).The hissing noise could be a vacuum leak(like TMS said), check esspecally the small vacuum hose coming from the back of the intake plenum going to the control solonoid(on some cars this hose is pierced from rubbing against the master brake cylinder) and check all the pipes and conections from the turbo to the intake for leaks.

[Simon]

What should i do with it??Can i drive it or shoud i leave it alone becouse i dont have money. When i was buying that car the persone witch was seling cheated me. That mother f....... said that there is everything ''OK'', after that i had to buy new turbo new engine and many many new things after that i paid the mechanics becouse i am a noob and as i said ''i dont know this car''

[chezina]

Check this things i mentioned(look at them for holes are they loose).By the way, when u say your engine has it's optimal temp do you refer to the original Nissan water temp gauge( cause the oil needs a lot more time to get it's temp than the water), u need an oil temp gauge to tell if the engine has it's optimal temp.

[Simon]

Yes i was waching on the orginal Nissan temp gauge and it takes about 10 min. is it normal ???

[chezina]

Yes this is normal, but like i said your engine is not at it's optimal temp although the Nissan say:Yes, but this is only for water, not for the engine oil.

[Simon]

Chezina and Themadscientist thank you very much tomorrow i will check all pipes

[slw240sx]

while on the topic of idle RPMs, my car wont cold idle! i mean when cold its idle is around 800-900, it wont idle higher, but once the motor is warm and even after driving it for a hour or so, the idle is at 1000-1200 staying closer to 1000or 1100, when i tap the gas it rasies an drops to 500 an goes right back up to the previous rpm ! is anyone else have this happen ?

[chezina]

Don't know if this helps, just unplug the AAC valve(when the motor is warm) and check the idle(RPM =800?), if it's off adjust it to 800, plug the AAC back in give it a try.BTW maybe taking apart and cleaning the whole AAC-FICD valve assembly is also a good idea.

[slw240sx]

haha i took the AAC out and a buch of plastic crap fell out of it maybe i should look into getting a new one, oh by the way that was before i got the car running,

[chezina]

slw240sx, yeah u should get another one if yours is already gone. This should solve your idle problem, cause the AAC is designed to do that:) .

[slw240sx]

yeah i tried to adjust the idle via the idle screw and nothin i disconnected the aac and nothing happens, i lowerd it a little via the TPS but its still sitting around 1000 when warm.