just bought used rx7..and needs help about my cars idle

[Kurojishi Rio]

hello there,im currently studying in japan but im from perlis.I just bought my dream car..FD3s rx7..it runs smoothly and fast but when it comes to idle,it keeps on hesitating betwen 1400~1700 rpm..what could be the problem?is it the TPS??

fd3s 1500 idle problem - YouTube

 

[adamckc]

the engine timing is so fucking high.. lower the timing bro..

 

[Kurojishi Rio]

the engine timing is so fucking high.. lower the timing bro..

how do I lower the timing?sorry Im a bit noob when it comes to tuning..

 

[malimsiao]

u're in japan, the automotive land with sooo many master in rotory and u are seeking help from malaysia? are u kidding?

anyway from the video, i did notice it is a cold engine from the water temp meter. It is normal with that level of idling if u are having a cold start. Same as my car.

 

[Kurojishi Rio]

u're in japan, the automotive land with sooo many master in rotory and u are seeking help from malaysia? are u kidding?

anyway from the video, i did notice it is a cold engine from the water temp meter. It is normal with that level of idling if u are having a cold start. Same as my car.

If u r in my shoes I believe u will also seek help from internet first bcos people here in japan doesn't really understand or know how to speak english~and eventhough Im an engineering student here,there is still so much japanese engineering terms that I dont understands..thats why im seeking help from all of you~~

yeah its a cold start but even when the engine is warmed up the rpm wont drops..it stays there at 1500 rpm and then its start to hunt between 1400~1700 rpm...

 

[phat7]

Couple of issues start reading the sticky's on the site and rx7forum.

start with grounding, make sure its secured correctly.

i would adjust tps or at least check the tolerances.
TPS Adjustment

The other thing to adjust is the screw under the intake manifold. there are numerous write ups here and on the big forum. check that.

 

[Kurojishi Rio]

thanks phat7~I'll be sure to check all those things~I'll post the result if it works~

 

[woaychee]

what ECU installed in the car?

 

[Kurojishi Rio]

hey I tested the TPS with a voltmeter and here is the readings.
with the red lead connected to the 3f ECU connector: 1.04v
with the red lead connected to the 3g ECU connector: 0.4v
both tested with closed throttle.

does the TPS needs to be adjusted?

---------- Post added at 04:48 PM ---------- 6 hour anti-bump limit - Previous post was at 12:44 PM ----------

what ECU installed in the car?

I believe its a stock one that came with 93 fd3s..never checked the ECU..

 

[Kurojishi Rio]

just fixed the problem~it seems that there is no problem with the TPS neither the idle screw but it was a vacuum leak.the idle controlling bulb was stuck opened by something unknown.cleaned it and my FD is as good as new~