fc3si

hey i have an '86 rx-7 n/a.

i just finished troubleshooting and i've narrowed it down to the injectors/circuitry.

the fuel pump is new and when i open the air meter is sprays from the main fuel line.

but the injectors don't pulse???

what would cause this? and what should i check.

ALL the fuses are fine

thanks, Sean

Aaron Cake

iTrader: (1)

Check the crank angle sensor.

fc3si

i checked it and the resistance was .161 on both sides of the clip.

how can i test the actual injector?
i have the primarys out right now.

the clip voltage for them changed when i tapped the ground against the bell housing.

fc3si

also tested the resistor box and it's good.

does the crank sensor have to spin to get injector pulse?

fc3si

it's a mystery.

Digi7ech

iTrader: (1)

^yes, you need to spin the cas to make the injectors fire.

Check the CAS plug. Mine got loose one time and wouldn't fire.

fc3si

so if i spin the CAS with the key set to "ON" i should get a pulse from the injector clip?

i'm pretty sure my CAS is good, i tested the resistance as per the service manual and it's within spec.

Digi7ech

iTrader: (1)

I've done it before.

I pulled the CAS out(only do if you know how to put back in correctly) Then left it plugged in and key on. I spun it and heard all the injectors going off.

You can check the injectors going off by sticking a multimeter in to the backside of the ECU plug.
You'd have to check the Service manual to determine which pins are the injectors. You also shoudl only test the primaries. The secondaries won't come on unless you're over 3800 rpm.

Marek

iTrader: (2)

Also make sure that you are checking the right injectors. The Primary injectors are very difficult to get at. The secondary injectors are quite visibile and like Digi7ech said will not fire untill over 3800rpm.

fc3si

i know, i have the upper intake manifold off.

fc3si

i'm going to get a new battery 'cause mine exploded last night sending me to the E.R lol

after i get the new batt i'll check the voltage at the clips and check if the injectors click etc

thanks for the help people

fc3si

picked up some free 450cc DSM injectors, gonna try those out.


what's the flow rate on the stock primarys? 460cc right?

fc3si

okay, update...

installed DSM injectors and finally got pulse!!!

the car almost started then just bogged out.

and there's a major fuel leak.

i'm gonna do some investigating and repairs.

updates coming eventually.

thanks for the support..

irishpilot

iTrader: (4)

*** man, good luck...

SO youre injectors were bad? Or was it wiring?

--im having similar issue after my 13b swap....

fc3si

Yes, it was the injectors.

still won't start but that 'cause i have a bad fuel leak

irishpilot

iTrader: (4)

do you know if the 88' has a resistor box for the injectors?? I dont believe I have one for my swap....

fc3si

fixed everything. car still won't start. i have a feeling it's a timing issue.

i have everything set PERFECTLY and it still won't start?!

any pointers?

fc3si

Get fuel, and when i pull the plugs they are wet.

gets spark, shocked myself a few times lol.

but it won't start!?

wtf?

Aaron Cake

iTrader: (1)

Likely flooded. You can put a little oil into each chamber to build up compression. Or, you can cut through the BS and just push start it with another vehicle. That always works.