After having searched, I tried adjusting my TPS but it didn't work. I'm with this problem since june 08, I don't know where it comes from. When I put the A/C on, the bouncing idle stops (but is still very high: 1,500 RPM). If I disconnect the boost sensor, the idle is great (1,100 RPM), but there is a lot of black smoke...

Anyone?

 

I also made a video... http://www.youtube.com/watch?v=KlQwRp3-3VU

The weird sound that we hear at 0:25 is the air pump... still plugged but is definitively broken.

 

How do you know for sure the air pump is broken? DO you see the clutch spinning? Or the pulley surrounding it is just spinning and not the clutch?

Also, have you checked the IAC (idle air control), its right behind the upper intake manifold.

My suggestion is plug the map sensor back, make sure you have the correct TPS voltages and go from there. Dont jump from one thing to another, you'll get nowhere and you'll create more headaches.

 

Have you checked for vacuum leaks, unplugged hoses etc?

thewird

 

A bouncing idle is often caused by a too lean condition, or if the computer cannot achieve the correct idle speed due to the throttle body being out of adjustment, or if the IAC or BAC (whatever you want to call it) is not functioning properly. The computer will try to achieve the set target idle and will hunt if it is unable to do so. A vacuum leak will normally result in a high idle.

 

The pulley surrounding it is just spinning and not the clutch. I checked the IAC. The voltage of the TPS is perfect.


Yes I did. I'm really tired of that problem! The performance of the car are all perfect...

But hey, I don't know if that helps: When I get to 4k RPM (end of the 1st turbo), I hear a VERY little sound of air "psssst" during 0,1 second.... I don't know if that can be the vaccuum leak? I don't know how to check for this vaccuum leak... I just can't unscrew everything to see if there's a broken hose !?!?

Thanks guys!

 

i had a high idle not too long ago and after months of trying to figure it out i found out that it was the throttle linkage that was getting stuck because the springs wherent closing the throttle all the way to the adjustment screw. if that makes any sense lol

 

5 minutes ago...

I put the A/C on to stabilize the idle, then I turned it off, and the idle won't bounce anymore ?! But I have a very high idle of 2,400 RPM!

 

try pushing the linkage down with your finger as if you where closing the throttle body to see what happens.

 

You mean, if I push the throttle? -> Goes up to about 2,800 RPM, down to 1k RPM and back to 2,400 RP

 

Mine sounded exactly like that, I had a small vacuum leak, but what was causing it to do that was my blown lower intake manifold gasket. Like super blown right out of the car, with gasoline running down the outside of the block. It was bad. But replacing the gasket fixed the car right up.

 

A broken lower intake manifold gasket is really possible, how do I do to see if the gasket is broken?

 

spray some soap where you suspect it to be leaking

 

The bouncing idle came back, but could a broken gasket/vaccuum leak cause a bouncing idle ?? It's non-sense... I heard that it can be a jammed throttle cable, or a faulty map sensor ??? The throttle cable looks okay, but how do I do to see if the map sensor is okay too ?

 

Up !!!!

 

Are you on the stock ECU?

 

Yes I am with the stock ECU. Do you think that if I buy the Power FC, the problem should stop? (I'll buy the Power FC when the FD will be repaired anyway)

 

Have you tried pulling ECU codes yet?

https://www.rx7club.com/3rd-gen-archives-73/there-any-chance-read-ecu-codes-without-ecl-238994/

 

I have a JDM, I don't know if it's the same thing? But I'll add that to my "To do" list, thanks!

 

I had similar problem years ago and it was the LIM.

 

I am not an expert yet, but I would suggest you get the car is good running order before you replace the ECU with a PFC...just to eliminate more headaches before new ones start. I have had some issues with my car having a little bounce to the idle...I have a stock intake/turbos/IC, but full exhaust and no emmissions...that could be part of my problem...but it is 23 degrees and I am not into starting it right now or driving it to figure it out...

Trev

 

Yes this is why I don't want to buy the PFC now, I want to fix everything because I don't think this mod is Plug & Play !!!!

 

The PFC does not eliminate idle problems usually. It still takes a good tune, all engine electronics working, and proper throttlebody adjustment to keep the idle stable under all conditions.

 

Ok I retrieved engine codes.

13: Pressure sensor - Intake manifold

 

Your map sensor might be dead although I've never heard of that happening. Check the wiring going to the map sensor.

thewird