Hi,
first sorry for bad english.
My car : 2004 4 port/192hp. 130000km freshly resealed engine now on it 1000 km.

Symptoms : low power above 5000 RPM it hardly speeds above 5500.
The torque is much lower then in low RPM ( 3000 rpm).
Secondary o2 sensor is showing around 0,950 volt(running rich) around 5000 and above on full throttle ( what is highest i saw on this car). In low rpm its running completely normal o2 is shoving normal around 0,6-0,8 full throttle.

ITs not stalling, cold starts without problem only when realy hot have to wait a 5 minutes to start it up. But i think its normal i have slow starter around 170 rpm.

I changed primary o2 sensor today nothing changed.
New plugs coils wires.
Had only 2 dtcs : high voltage primary o2 so i changed it that disapeared now only secondary air injection is showing up now. The fan is running at cold startup so i dont know whats wrong with it.

Checked the intake valves (SSV and VDI) both are movable easily by hand and when somebody pushing throttle i was able see them opening and closing.

I am out of ideas what can be doing this...
I guess is something with lack of air in engine...

Realy need help.

 

what is the code for the second code that you had, the air injection thing?

 

P0410 Secondary Air Injection System

Just came back from drive... It looks like the p0132 O2 sensor circuit high voltage (bank 1 sensor1 ) pid has reapeared. So its not the cause of the problem just a consequence.

I am betting its clogged cat. I will take it down and try a car without it.

 

It's not in limp mode is it?

Did you reset the Eccentric shaft sensor? ( 20+ brake stomp one )

 

Try unplugging the O2 sensor and see if that helps.....

 

It did 20 brake push but some time before repleacing o2 sensor after that i havent done it. I havent felt its needed.

What?

Both or only primary one?

 

I would do both...and see if it responds. It will put it in Open loop.

 

Just red about limp mode and it is not in limp mode. its normaly drivable in rpm below 4,5k rpm.
I go try it without o2 sensors once its cooled down little bit its still hot i cant unplug them.

 

Just came back from test drive with unpluged o2 sensors and 20 push brake.
It was same or worse.

Acceleration stops completly at 7000rpm..

Here is a video of drive : https://www.youtube.com/watch?v=5iiu...ature=youtu.be

 

Today i drived 6 port 2006 rx8. I can say my 4 port rx8 has more power from 1000 to 5000 rpm.

 

Could be your cat or air filter is clogged.

 

Cat was bad replaced it... tested it with opened filter and new cat.
It is doing the same just gained little power in low rpm due to new cat.

For my it is looking like some kind of limp mode or such a thing.
When full throttling on second gear the rpm raise stops at 7000 rpm and torque lowers much above ~4,500.

 

I changed the primary o2 sensor as i wrote. I have put in an universal bosch o2 sensor and after 5 minutes of driving i got same cel code p0132.

I was consulting this with my friend and he told me these universal o2 sensor are crappy.
Could be a car with p0132 loosing all the power in high rpm due to running in open loop??? Dont forget its a 4 port engine = no apv valve.

Or maybe something with ignition?
Because the more power i loose the more richer mixture is reported by secondary o2 sensor. If i understand it right high voltage on o2 sensor is rich, low voltage or 0 volt is lean. Can somebody confirm this or i did somewhere great mistake..
So maybe plugs are too much wet and they fail to spark when so much rich mixture is used. (something like flooding the engine in high rpm).

Or maybe secondary injectors are putting in too much or little.
case 1: with disconnected 1 secondary injector (does not matter which side) i get lean report from o2 sensor with nearly same much power lost above 5000 rpm
case 2:running all injectors it feels nearly same a very little more power gained compared to case 1 above 5000 rpm and o2 reports very rich mixture above 5000 rpm. In practice : the higher i rev it (over 5000 rpm) the more rich mixture is reported and the more power is lost.

So those are my theories can somebody confirm or reject them.

I don t know how to test the ignition in high revs same i don t know how to check flow in secondary injectors when the problem appears.
I would need some kind of technical data about what should be reported by sensor in correctly working rx8. Can somebody suggest something?

 

Could it be SSV valve that is stuck closed? I would expect this to make engine run rich, and also loose power above 4kRPM. worth a check.

 

The ssv closed would cause a power loss, but it should not affect afr since the amount of fuel injected is based on air intake.

If anything i think it might be lean since you have another injector pumping fuel and the air is not picking it up.

 

Forgot to mention i am using Re8c-L and re9b-T plugs, maybe Re8c-L are making this. Or not?

If it would not be picked up it would not be running this rich.

 

Did you replace wires and coils with your rebuild? Do you have a flashing cel?

I don't think it is this, but are you sure your injectors are wired correctly?

 

Wires coils replaced. Yes i have p0132 primary o2 sensor.

I am sure injectors are wired correctly. I was messing with them many times. I connected them as it is in official electrical manual.

In this order :
Front Primary --- Light Green /Red wire --- White/black
Rear Primary --- Light Green /Black wire --- White/black
Front Secondary --- Green/Red --- White/black
Rear Secondary --- Black/Blue --- White/black

 

Check out the sock in the fuel pump. Could be clogged.

 

Its clean.


I speaked today with a mechanic from mazda service. We were speaking about my engine rebuild. My 8 is doing this since rebuild. I used in my engine rear rotor and rear housing from other engine because my was seized ( could not take out apex seal holder on 1 side). He told me if i mixed up rotors it may be the problem. Maybe i used front rotor not rear and that is making problems with air intaking.

Yesterday another thing appeared. It is doing a knocking sound (like horse on concrete). It is well hearable from somewhere near flywheel. Its hearable only when engine decelerates or in idle. It does not disappear when clutch pushed. nO difference in engine power.
Here is the recording link : http://vocaroo.com/i/s0c4jNtK96mf

 

Well... rotors were mixed up. Front was front but rear was front rotor as well.
Still the problem persist but its now doing from 6k rpm higher.
I am betting on o2 sensors will see what happens when i changed them.

 

Today changed front O2 sensor.
Result:
more power in low rpm
mid rpm same
high rpm (above 6000) same low power

No error dtc codes
Dashboard showing no warning lights.

Selling the car no idea whats wrong with it.

Found out when i am in rpm area where the problem occurs (6000+) when i use less throttle at about 50% the car stops doing ghaaaa sound and continues to rev up normally until the limiter.

Test with 100% throttle rev from 3k to max rpm:
While testing it i found out the the mixture on full throttle is nearly same all the way from 3k rpm to maximum. So i consider it is normal mixture on 100% throttle.
But spark advance is acting strange. Full throttling from 3k to 6k rpm advance rising. At 6k rpm Advance stops rising at about 23°. Does not rise at all until it stops reving higher at 7k rpm.

Test with about 50% throttle rev from 3k to max rpm:
Car acts more normal in 6000+ rpm the spark advance is at about 32° and moves with throttle little pushed or lifted up. Was able to rev it to limiter with decent power while checking my foot on pedal not to push too much.
Mixture same.

Does anybody know what the hell may be the problem with my cursed car?

 

I am just letting you know that solved my problem, for people with similar problems.

What i did: i changed all 4 injectors from other (working) rx8 and the plastic part of intake (where the vacum selenoids are).

I dont know which thing of these two helped but could be either one. My intake was missing 1 plastic cup on rear side of vacuum selenoids (those ones with mitsubishi brand on them) and check valve on hose to vacuum selenoids. I had there just straight line to vacuum selenoids.

But may be my injectors were clogged.

Tomorrow i will put back my intake. Will see what happens.

 

Looks like injectors were OK. I placed back plastic part of my intake and problem is back.
So now what can cause it: one of selenoids, missing cup, or check valve.

 

who built the engine, what was used ?

have u check the engine itself