I got a rx7 -93 automatic who is singleturbo converted. I have a problem with the secondary injectors, i can see on my wideband lambda that it leans out ALOT everytime it start to build boost.
The wierd thing is that it worked one day, after i had plugged in all the solenoids and it had a rich mixture and worked great with 0,6bar. But the day after i had the same problem and i didn't even open the hood. Wierd?

The only time it worked after the single turbo conversion was that day....i have checked the wiring to the ECU, boost-sensor, disconnect the battery 20sec and so on. I can make a list of all the thinks i tryed.
What does the secondary injector need to work? Fuel, ecu and boost sensor?

Plz help me out, hate to be stuck with questions and no ideas.

 

Map sensor not reading boost?
----Perhaps it is not seeing the boost? (loose vacuum line)
----Wiring to map sensor?

 

I have tried loose the vacuum and the engine starts to sound bad on idle. And if i disconnect the cable the engine stalls at once. So i guess the map sensor work but maby it dosnt read right boost?
I have tried to connect the vacuum to other places after the trottle to but same ****.

I have the stock ecu to...but it would work up to 0,8 bar or so?

First i thought it was the fuelpump so i changed that and i bought a malpassi fuel pressure regulator to. But then i notice that the secondary inj dosnt work.

 

Have you done electrical tests through the harness to ensure the secondaries click when they get voltage?

Dave

 

No...i have tested the ohm resist in them....i seem ok i think it was 14.

How do i test them on 12v?
I have the pdf files....what page is the test? Sound like a thing i would have done first...

 

I used a 9V battery and a wire running from the wiring harness at the ECU to the main relay.

Keep the battery well clear of the injectors and connect/disconnect. You can hear it click if it's working right. Sometimes they stick open or closed and you won't hear it click very well. If you have a stuck injector it can actually help to tap on it with a screwdriver handle to get it moving again.

I don't think you have a stuck injector, because it's unlikely that both would become completely stuck at the same time. I really think it's that this method tests the entire harness for an open circuit or short.

Dave

 

ooh sound very funny :P
I guess i can test the cables from ecu to injector and see the ohm but there is resistors to the injector to on these cars so i dont know what the right value is.

Does it mather how i connect the + and - on the injector?

And how does the ecu work...to activate the secondary injector you have to get som boost -0,2 bar or so. And what is it more? Knocksensor? Lambda? rpm? Or is it just the boost sensor who tells the secondary to inject fuel?

Thank u very much for the your help and i love the steph brother movie LOL...

 

what turbo are you running?

i'd say change to a aftermarket ecu, you will not be able to boost on the stock ecu with a single turbo anyways...

 

Running a t62 but it was running well when the injector worked so i will wait and buy a aftermarket ecu for 1500$. Im not going past 320hp anyway i got the automatic gearbox

Skoj o se en svensk btw

 

It's a combination of RPM and MAP along with special cases for engine temperature and overboost, etc. If you are running a single turbo on a stock ECU you might want to reconsider that idea.

In general, the injector sees a voltage which is open when the injector is closed. The ECU connects to ground when it wants the injector open.

With the engine off and harness disconnected, the polarity doesn't matter. You can also use a 12v source if you prefer, I just happen to find 9v batteries convenient.

Dave

 

Okey, becuse it worked fine and the gearbox worked without any problem i go with the stock. Otherwise i need the power commander with the auto wiring harness and my wallet isnt that big at this moment. And i got the wideband lambda and a progressive fuel regulator. What more can i need?
Anyway it dosnt mather now becuse it worked for 2 weeks ago i guess i have to check the wiring from ecu to injector....

 

Since you have the wideband lambda you should be fine as long as it shows you're getting good AFRs.

Dave