Stroock639

i cleaned the air mix path as best as i could, sprayed air intake cleaner right into the two big holes for awhile while the car was idling as per yamae's instructions. had to give a tug on the throttle cable every so often to keep it from stalling, and it actually did stall twice. i also reset the ecu and gave it a decent thrashing and it really didnt seem to make any difference, if not a slight improvement directly after cleaning it. now its pretty much the same as it was before. next i wanna take off the throttle body and thoroughly clean it as best as i can, and not leave that job to someone else this time.

Legender

I think you'll find the biggest difference in cleaning the throttle body... I had a low idle problem that would sometimes stall when exiting the freeway and coming to a stop. Would start up fine... but cleaning the throttle body fixed my problem. It was on a 95... didn't clean the air mix path at all... only the throttle body. Good luck.

Doc Yota

I have the same issue. Cleaned the throttle body well and changed the temp sensor. Didn't help.

sha4000

iTrader: (1)

I have the issue also and have not run it down yet. I removed the throttle body and cleaned it thoroughly during my TB/cam/crank seal job and it idles right sometimes while in drive but drops to about 400 sometimes. I'm kind of annoyed at myself for not changing the fan bracket while I was in there since I now believe it is bad. I wonder if that could affect the RPMs? I did OEM motor mounts last summer too.

Doc Yota

Luckily I get no vibration, just the 400-450 rpm idle. Also, if I reset my ECU it will idle around 200-250 rpm with no vibration, very quiet and you would think it would die but it doesn't. It carries on like that for about an hour and goes back to 400ish with no lights or a/c and 600ish rpm with.....Strange.

SynicalVip

iTrader: (2)

My 98 is the same as well it idles low but when turn on the light one click it smooth out and feel normal idling. I've change the plugs, pcv, checked for vaccum leak and clean the throttle body but yet still the same not sure what else to change now

Stroock639

so i looked inside the throttle body and it was pretty clean, I sprayed some throttle body cleaner and cleaned inside with a rag and cleaned the air mix path again and it made no difference of course. it's never about to stall, just kind of low and there'll be a slight vibration when it's warm unless I turn the lights at least 1 click or turn on the A/C

scRuss

Has anyone fixed this problem?
Im encountering the same problems
Thanks

mattylex77

I am having the same issue. i pulled the codes and i got p1400 (sub TP malfunction). This is the one for the traction control and consequently the more expensive of the two. Ill be doing the replacement soon and will have an update

Doc Yota

I have cleaned the air mix path and throttle body and have the same issue. Still looking.

Stroock639

does anyone suggest a particular method for finding a vacuum leak? my throttle body and air mix path are clean, and before replacing any sensors i want to be able to completely rule out (or discover) a vacuum leak

Yamae

So you still have the problem. The next step you might try is to check the fuel injector professionally using a sound scope.

A skilled mechanic can distinguish a bad injector with it. A needle valve in the injector sometimes sticks and causes the problem and this can be checked by the sound scope if he is experienced. Sometimes only a clogged injector causes the problem. In any case, the waveform of the injector sound and the FFT(Fast Fourier Transform) results can help you to identify the poorly working injector without removing it.

sha4000

iTrader: (1)

Has anyone had any luck running this issue down? My RPMs were bouncing around while driving and idling. I disconnected the battery for a lil and that speed the bouncy needle. Yamae has a good suggestion about the injectors though. While the needle was bouncing the car was lacking for take off power and felt to me like it was not getting any fuel.

Odzsee

Hi,

I was looking for the PCV valve, but could not find. There is the PCV valve VVTi engine 99?

I like replace.

THX

sha4000

iTrader: (1)

The PCV is on the drivers side of the engine in the area of front of the valve cover.