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-   -   Hearing a whoosh sound from the intake manifold (https://www.rx7club.com/new-member-rx-7-technical-256/hearing-whoosh-sound-intake-manifold-1021551/)

Konnors7 12-28-12 12:21 PM

Hearing a whoosh sound from the intake manifold
 
Okay I am having problems starting my car I had it running then the next day I tried to start it and it didn't want to start and with the fuel pump on it started making a whoosh sound from the intake manifold. I am thinking a possible injector stuck open? Any suggestions would help

misterstyx69 12-28-12 07:02 PM

are you trying to start the car without the AFM hooked up?
(and by the way, you can hear a stuck fuel injector.Explanation by Mr Cake below.)

Aaron Cake 12-29-12 09:58 AM

A stuck injector is pretty easy to hear if it is firehosing fuel into the manifold. Jumper the fuel pump test connector (yellow two pin at the passenger shock tower) and key the car on but don't start it. You'll hear the fuel rushing through the rails, but if you remove the upper intake, a stuck injector will be obvious.

Make sure to drain all that fuel out of the engine before you try to turn it over!

Konnors7 12-29-12 03:50 PM

I did a fuel pump rewire so that the fuel pump is on when the key is on so when I unplugged it I stopped hearing the sound. is there any way to clean a stuck injector after taking it out of the car?( I am asking dumb questions I know but I know little about rotaries)

misterstyx69 12-29-12 06:08 PM

You send them off to get them cleaned.
Check out www.Witchunter.com or Injector-Rehab - Fuel injector cleaning, flow testing, and complete blueprinting service.
do all 4..no sense in doing just one.

Aaron Cake 12-30-12 10:23 AM


Originally Posted by Konnors7 (Post 11329138)
I did a fuel pump rewire so that the fuel pump is on when the key is on so when I unplugged it I stopped hearing the sound. is there any way to clean a stuck injector after taking it out of the car?( I am asking dumb questions I know but I know little about rotaries)

You need to fix this rewire! It's a dangerous setup. For example, you end up in a collision and the fuel pump keeps running for as long as the key is in, pumping pressurized fuel into a fire, while you are knocked out behind the wheel.

The stock ECU stops the fuel pump as soon as the engine stops rotating, preventing this from happening.

There is zero valid reason to modify the pump to run all the time.

None of this is rotary specific. A fuel injector is a fuel injector. Remove the injectors then take them to your local injection shop (check the Yellow Pages). Normally about $30 per injector to have them cleaned. Note you can also prove if one is leaking by just removing the fuel rail with injectors attached, hold the injectors in, and power up the fuel pump. The stuck injector will spray fuel.

Konnors7 12-30-12 11:30 AM

I did that rewire just to get fuel into the engine it's just temporary. I have another stupid question. There is a big metal canister type thing underneath my turbo I'm not a 100% sure what it is. I know what my waste gate looks like and it's underneath all of that.

RXSpeed16 12-30-12 01:28 PM


Originally Posted by Konnors7 (Post 11329811)
I did that rewire just to get fuel into the engine it's just temporary. I have another stupid question. There is a big metal canister type thing underneath my turbo I'm not a 100% sure what it is. I know what my waste gate looks like and it's underneath all of that.

That's the twin scroll actuator. It diverts exhaust gases inside the exhaust manifold to improve turbo spool.

Konnors7 12-30-12 03:06 PM

Okay thanks everyone. I appreciate all the response and feedback.


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