Hi!

Sorry for my english

RX-8 2003 USA manual 6-speed

I bought a second PX 8 with a bad engine and idle jump

I replaced with a working RX8:
- engine
- fuel pump
- fuel inj
- plastic intake collector
- BHR coils
- new spark plug NGK
- new air filter
- new oil & filter
- knock sensor
- ESS sensor
- MAF sensor
- temp sensor
- lambda
- throttle

Delete cat and rear lembda and air pump

CEL codes: rear lambda error, P0171, U0155

Problem video:

 

Looks like an AFR problem, and having a +25% short term fuel trim is certainly supporting that. Have you reset the NVRAM yet?

 

yes, i reset NVRAM


an hour drive LTFT set 25%

 

It looks like your MAF is low. I think I saw 4.2g/sec. Vacuum leak?

I would check your injector wiring and look for vacuum leaks while you're in there. the combination could explain your High trim.

 

Today I use a smoke machine and take a photo of the wires

 

I had troubles with injector wiring. The colors get faded no the ends. you need to remove the tape and look at the wire. That way you can see the color of each wire very well.

 

New check p0506

 

Hello. I am owner this car. My name is Dasha. And I very very really beg you that you helped me. For two weeks, we can not find the cause. We don't just write you about my problem. I cry all the time. This is very serious for me. One hope remains only for you. Help me please ...

 

Post your IDLE MAF g/sec. Also check the system for vacuum leaks and if you find none, then check your injector wiring.

If you do not try the basic problems then there is no reason for us to try helping.

 

idle 3.8g/s

sensor changed from another machine, so it gives the same 3.8

 

I'd say you have a HUGE vacuum leak somewhere.

 

I have been seeing maf rates like that when cranking, so I'll vouch for the vacuum leak too. Test with a vacuum tester if you have one at hand. You can also try spraying starter fluid on the intake manifold to find possible leaks.

 

I squirted spray. did not find the leak.
I want to try the smoke machine

 

With STFT that bad and MAF that low, I'd going to be a pretty big leak. Like the intake manifold service port caps are missing or there is a complete gasket missing somewhere, or the intake isn't seated correctly, etc...

 

Hi!

I used a smoke machine - no leaks
Check the wires on the injectors - all right


If you disable the MAF, the machine works well but heard misfiring

 

Did you peal back the cover and check the wires or did you just check the ends?

 

I replaced the motor wires for reliability on other

 

I am alone with this problem?

 

I do not understand what you mean about replacing the wires.

 

I replaced the wire from another machine and the problem persists

 

Transfer my theme in Series I Trouble Shooting
There can help =(

 

What is the vacuum must be at idle?

 

UP up

 

Problem solved!
The reason was in front grid dirty of the MAF !

 

Idle longer jump.
Error P0171 still and MAF sensor how 3.8 g/s