RobbyP33

That make take some time as I dont know anyone with one. Is there anyway it could be a bad fuel injector? I have a few spares that came with the car.

rotorhead_izzy

iTrader: (36)

Its possible it could be a bad injector, but doing a compression test is needed. It'll take you less time to do a compression test, then swap out injectors which may also be bad. Go buy a compression tester, they are relatively inexpensive

lduley

iTrader: (1)

or most auto part stores let you rent them for the cost of the tester, they just give you your money back when you return it

also, just cause you have injectors "laying around" doesn't mean they are good either, if the compression test come back good, I would get 4 stock injectors, get them cleaned, than install them.

Still, compression test first, because if your compression is low, or you have a rotor with a dead/nearly dead face, everything will have been for naught so far

RobbyP33

Just ordered a tester off ebay, will take some time to get here. I'll let you know the results in a weeks time at the latest.

RobbyP33

Got 115psi in front rotor, 110psi in rear. Is it safe to assume its the injectors now?

lduley

iTrader: (1)

All 3 faces of each rotor?

RobbyP33

Yes I didnt see anything abnormal.

lduley

iTrader: (1)

Leaking jectors are a possibility, but requires you to completly remove the upper and mid intake to gain access. Is your air pump working? Are the 5th/6th ports working? The air pump is supposed to help stop backfiring IIRC

RobbyP33

What should I do to see if the air pump is working. I can feel air being sucked into the air box when the car is running, if thats worth anything.

lduley

iTrader: (1)

All your feeling is the motor naturally sucking air. There is 2 hoses running to your air pump, take one of them off and start your car and put your hand over the one you took off, you should either feel it sucking or blowing (heh). Mind you your car may run like @$$ with the hose unhooked so don't be alarmed

RobbyP33

Are the hoses located towards the back of the engine bay?

lduley

iTrader: (1)

Foxed.ca - Mazda RX-7 Manuals

under idle and emissions will help you test all emission related items

RobbyP33

Im pretty sure injectors are the problem. Im looking into getting aftermaket ones. What cc should I get for a stock n/a 13b?

lduley

iTrader: (1)

Same as stock, 550cc IIRC

RobbyP33

Can you send me a link to something that would be a dorect fit and dependable? Alot are saying they fit S5 model years but I need S4.

lduley

iTrader: (1)

Why not just send them out to be cleaned/flow tested? Much cheaper option

RobbyP33

Where would I do that?

rotorhead_izzy

iTrader: (36)

You can send them to rc engineering or witchhunter injectors

RobbyP33

Can you guys link me to something or tell me how to remove the injectors?

rotorhead_izzy

iTrader: (36)

Look at the FSM.

RobbyP33

Could it also be the fuel pressure regulator? Or is it more likely to be the injectors?

RobbyP33

Got the injectors back from being cleaned. I put everything back together and the engine will strat but within 10 seconds the engine will lose RPM and stall out. Does anyone know whats going on?

RobbyP33

Fixed this problem. The injector cleaning was little to no help. Still spits gas out of exhaust. Any chance that its the fuel pressure valve? Or maybe the cat is clogged or flooded?

rotorhead_izzy

iTrader: (36)

If you think the cat is plugged, disconnect the exhaust before the cat and give it a shot. As far as fuel pressure goes, that could be it. Check fuel pressure.

RobbyP33

To check the fuel pressure is there a part on the fuel rail i can hook up to or will i have to disconnect a fuel line?