nigelrogers

hello every i am nigel i am new to this forum and also to rx7

i have a problem my secondary injectors not firing and the car is
not reving so can u guts help me with some tips on what to do i am using stock ecu

jd to rescue

iTrader: (3)

I am not trying to flame you because you are new to the forum, but the reason you are not getting any response is because your description is not very helpful. If you have no working knowledge of the car, then you need to spend a fair amount of time reading on this forum to get acquainted with some of the dos, don'ts and general car basics. The first question to your question is, 'how do you know the secondary injectors are not firing?' The lack of upper rev range umph could be a number of things. So you need to get a better sense of what is going on with the car first before anyone can be of help with you on here. You may be better served having a (God forbid) mechanic look at the car.

maxcooper

I had a secondary injector fail once and I had these symptoms:
1. The car would lose power (stumble, "fall flat on its face") under any boost.
2. If I used very light throttle (no boost), I could rev up to about 4000 RPM, but it would stumble severely if I tried to rev any higher. This is what happened while driving, but I don't think I checked what it would do revving in neutral.

I removed the connnector from each injector and applied battery power momentarily. One of the injectors did not click, so I knew it was dead. I bought new injectors, but there are many people selling used ones now, so I would get used ones and have them reconditioned if I had to do it again and wanted to save money.

Is that what is happening with your car? If not, what is your car doing, and what makes you think it is a problem with the injectors?

-Max

nigelrogers

i know the injector is not getting any trigger because we used a 12 low current bulb across the injector plug and it didn't light we tried it on the primary and it lights the car would rev normal up to 3500 rpm then sputters breakup lack of gas if i trigger the injector manually it will try to rev a little higher """""""(God forbid) mechanic look at the car.

"""""""if there was 1 that i willing i would

i am from antigua the caribbean guess u dont know where that is anyway it is an island with 83 square mile in the eastern hemisphere

maxcooper

It sounds like you know this, but just to confirm: The secondary injectors are not supposed to fire until 3500-4000 RPM or so. Did you have the test light installed when you revved the car up to this range?

-Max

maxcooper

It sounds like you know this, but just to confirm: The secondary injectors are not supposed to fire until 3500-4000 RPM or so. Did you have the test light installed when you revved the car up to this range?

-Max

jd to rescue

iTrader: (3)

Okay. It sounds as though you may have a wiring problem. You say that the bulb does not light-up on the secondary injector leads and you were able to trigger the injectors manually with a 12 volt source. Does your bulb light up in the 4500 rpm range when the secondaries should be triggered by the ECU? I know that this may not be easy to do, but you'll need to tell me what you can test. Also, trace the secondary leads back to the harness to see if there are any breaks in the circuit. What kind of shape is the main wire harness in?

Oh! And how's the weather down there by the way? Hopefully, Frances is not causing too much havoc!

nigelrogers

the harness to the injectors are fine i am sure of that because i did a direct test on the ecu pinouts also but it still dosen't light i followed the manual and did some trouble shouting but no luck ...can some tell me what triggers the secondary injectors because some told me it is some sort of external sensor but it dosen't add up to me


thanks

maxcooper

It is not a sensor that triggers the secondary injectors. It is something like "when the primary injectors reach 40% duty cycle, bring in the secondaries". That's why the point at which they come in is not something simple to test like "exactly 3800 RPM", etc. It is a combination of things. However, it seems like any boost or ~4000 RPM are sufficient conditions to test for secondary operation.

-Max

nigelrogers

would my map sensor cause that

DCrosby

If the map sensor was bad you'd have horrible idle, but i suppose if it wasn't reading right the ecu would never see boost... Like max saaid... it's all of the sensors Map, Cas, that show the ecu when to fire the secondaries... I would do what max said and unplug the secondaries, and see if you can make them click manually by wireing them straight to a 12v source... thereby eliminating the ecu's descision making process...

nigelrogers

does both secondary injectors triggers together because i was thinking of using aditional injector controller """http://www.hksusa.com/categories/?id=1922""""""""a to activate the injectors for my test because i tried the 12v trigger and i flodded the engine

jd to rescue

iTrader: (3)

You may be having trouble with your ECU. I would suggest swapping with a buddy just to check, but I doubt there are any other 7s down there to even consider this. You may need to ship out your ECU to get it tested.

nigelrogers

thanks i will try that

nigelrogers

opps no luck the guy doesn't want to try anything with his car or lend us his ecu

going to try the aic this weekend

jd to rescue

iTrader: (3)

While you have time to burn, check your ground connections to see if you have a build-up of corrosion. If you do not have good ground contact, it can cause a variety of performance anomalies. There are three contacts that need to be checked in all.

nigelrogers

ok i will do that

wrankin

This may be a stupid question, but did you try to reset your ECU?

-bill

nigelrogers

well if it is as simple AS REMOVING the battery leads yea

don't think that your idea was stupid because it was the 1st step i did so you may call me stupid ............ha ha ha lol thanks for your idea

nigelrogers

i have tried swapping the ecu but no reault the same thing rev to app 4000 rpm then break's up ....do anyone knows which pin on the ecu you can find the rpm signal just to check if it reaching the ecu from the igniter

wrankin

remove the battery lead and *then* step on the brake pedal for 20-30 seconds. iirc, that is necessary to clear the ECU.

-b

nigelrogers

did that didn't work