hey guys..

i got a euro spec 91 N/A FC

and need some help.. most of the americans have a hard time helping me cuz of the model differences (dizzy etc)


i'm having a secondary injector problem.. they just don't fire...

i don't have a map sensor to unplug to simulate load... so i dunno how to trouble shoot it...

i dunno if it's the grounding?
some say it could be the injector resistor box?
could it be the AFM?


is there any hints or tips that u guys could give me?

having a powerband to only 3,500 rpm really sux...


is there any common problems on our euro FC's?

 

as far as i know, there is no S5 EU spec FC ( post picture of your engine bay and ECU number and we will tell you what u got )

only 86-88 (S4) NA's sold in europe, everything 89 and higher was turbo

for some S4 EU info try this :

http://rx7cz.net/tech/RX-7TrainingManual.zip


Problem described by you (secondaries not firing) could be resistor pack going bad (had that issue on one S4 EU NA FC here - tests by FSM were showing its ok, but it was not, replacing it fixed problem)

 

I doubt that its a grounding problem, afaik the injectors are sealed from the intakemanifold/fuelrail by grommets and o-rings.

Have you visually checked that they are not fireing? That really eliminates the problem to ignition only, which is dead simple on the dizzy system.

Go get the error codes read. It should tell you pretty much what is wrong
It could be the butterfly valves are sticking. check that the release solenoid is getting signal
As mentioned the resistor pack could be shot.

 

it's deffinately injectors... and not ignition

I put my LM1 in the car... right where secondaries should fire... the car leans out to the 22's

feathering the throttle under light loads can get the car to redline.. as soon as u punch it for the secondaries to come on.. boom the car dies...



is the US spec resistor pack the same as the EU spec? cuz i found out the hardway that the AFM isn't the same

 

ur welcome to shed any light if u can

 

yeah, i believe resistor pack is same for all models where is it used (including early turbos)

 

i see... i'll have to scour for one...

thanks for the tip.

hope that's what it is..

 

- can u post VIN number?
- picture and number of AFM ? (EU S4 ones are 5V, US S4 are 12V)

this is very interesting

- you have S4 NA engine for sure
- never seen this ECU number
- gauges, front bumper, wheels = S5

 

AFM: N323 13 210

 

OK, AFM is exactly same we have in our EU spec S4 NA's - N323, flapper type

I bet your car will run with S4 EU ECU as well : N322

 

think there's any advantage/disadvantage between our ecu's?

 

officially, there is no S5 NA for EU market, looks like mazda sold some hybrids (put together from leftover parts) in middle east

S4 NA was outdated with distributor and exhaust manifold from first generations, when sold in Europe (86-88), while US version at same time had CAS, catalyc convertors etc....

 

so when trouble shooting my car

u think i should "pretend" it's a first Gen... or an S4?

 

Wasn,t there a connection between the ignition and the injectors somewhere? Thats how it all gets timed for fuel right? I,ll get busy in the books and see what I find.

 

ur guess is as good as mine...

i thought the dizzy was seperate and the fueling was seperate...

i'm pretty sure we have a mechanical/centrifugal Dizzy...

pretty sure they're independant...

*shrug*

 

the car body looks S5, but all of the engine stuff looks S4 to me.... AFM looks S4, throttlebody/UIM looks S4.

S5 suppose to have the VDI throttle body. Indeed never saw a EU spec S5 NA, only US /Jspec ones

 

download that .zip i posted few posts higher, it is covering EU S4 and it will help you with troubleshooting

its not that big deal to test out if those injectors are getting electrical signal
(hooking up diodes to their connectors)

 

Can't help with the problems on this car, but it's very intresting to see a car that's neither EU nor US spec.
I didn't even know this setup (S5 NA with dizzy etc) existed... As Higgi said: it looks like it has been put together from parts the factory still had on the shelf somewhere.

 

This engine is completely different to the 150HP-Models in Europe.
Higher Compression rate, 160 HP, higher RPM, Catalyst ........

Please ask:

www.rx7-dreamcar-imports.de

ask for Jörg.

He can help you.

Guenni

 

hey Guenni, your post is kinda pointless
did you looked pictures and read all posts?

 

Oh? Sorry.

Guenni

 

As u could see, its no S5 NA, its EU spec S4 NA engine-wise. S4 water pump and cover, S4 intake, S4 AFM, S4 exhaust manifold. 146hp (110kw).

 

hi,i own a 80'rx7 with 13bt engine (from fc)i'm not sure if it's s4 or s5 but it run's with N322 ecu.espiacially:N322 18 881C.is this a na ecu?how it works with my turbo?the car seems to run ok...

 

Hi Ottoman,
Sorry, I can not help you with your problems, I guess I am to stupid and I have two left hands, but I love your pictures.

Does "Ottoman" means you live in Turkey, where is that licence plate from?
Did they (Mazda) sell the FC in your country or did you import it yourself?

 

N322 is EU spec NA ECU, it controlls just fuel. Ignition is old school distributor, vacuum controlled.
If your car would have bigger injectors, it could work with turbo, i would not call it safe, but i dont see a reason why it wont work somehow.