Strange high pitch sound - Need HELP!

[Oliver]

Originally posted by gbutcher
FANTASTIC THREAD OLIVER!!!

So it was the Oil Injectors themselves that were making the noise? or only one of them?

Or was it the vacuum connection to the oil injectors.

Well done mate!

Before removing the the oil injectors. I was only able to check the front oil injector by pitching the vac hose. Once I did this, the sound would stop. I could not get to the rear injector while the car was running. So, I can\'t say?

After I removed both injectors. I tested them by blowing air through and sucking air in. I could blow more air through the old ones and I could also suck are in. Compared to the new injectors... I could not suck air in and less air through. So, I can only come to the conclusion that both old injectors failed :confused:  Not sure why....I have not heard of anyone else with this problem before? I also, did not see any build up of dirt inside.

Very glad it\'s behind me!
Oliver

[Oliver]

Originally posted by clive
Well done Oliver for finding such an obscure strange fault and for sharing all your information and findings with us, as l realise this little noise must have taken many hours to sort !.

Many thanks,Clive
clive@mazdarotaryclub.com
//www.mazdarotaryclub.com
//www.mazdaRX-8club.com

Yes it took some time to get it all back together. I went to Sweden for a track day (august) I might have told you already?. On the boat over. A gentleman forgot  to use his hand brake and found his little Honda CRV locked on to my front bumper. Had the hood, fenders and front nose repainted. While that was being done. I removed everything to get to the injectors. I have been there before, so it was not a shocker like the first time. I didn\'t have to label everything this time :rollin (vac hoses) Getting the oil injectors out was a fun job. I did have to partly loosen the primary injector so I could get a wrench around the oil injectors. After that it all went well. I enjoy working on the car. Just wish I had more time to do so. Thanks for the kind words Clives and answering my PM about the fender.

Here is a photo of the damage. Mostly paint scratches on the hood and nose. Bent tag. Can\'t really tell from the photo\'s but it cost the guy 1000 euros. I\'m happy to have it all back together and this weekend give it a final wash and store it for the winter.

Oliver

[Glenn Butcher]

Hi Oliver,

I think I have read one or two forums where people have had problems with the OMP Nozzles, but not a problem like yours.  There is reference as you probably know in the Factory Workshop Manual here: http://www.iluvmyrx7.com/3rdgen/manuals/94%20manual/94D%20-%20Lubrication%20System.pdf  for the Nozzles.  Pic. also attached.

But I can\'t see anything about your noise problem

Thanks again mate.

[Glenn Butcher]

Just thinking about it - as I posted the thread.  If air/fluid can flow both ways then obviously that must have been the whistling.

Have you confirmed that the OMP is ok? i.e. that it is pumping the correct amount of oil to lubricate the seals?  how much oil does your engine use?

[Oliver]

Thanks for the attachment. I have the owners manual too and like you found out they don\'t talk about the sound only how to test the injector. It\'s been a crazy chase to figure it out:)

My oil metering pump is working fine. I have no problems with oil consumption.

When I went to Sweden I premixed because I was a little nervous to push the car hard with the oil injectors in question. Before I drove home from the track. I noticed the oil was down a 1/4. Added oil. Once home and I started to remove the manifold and elbow pipe  There was oil in them. I have found out during track driving that the oil moves up the filler tube and in to the manifold/throttle body and elbow pipe. I am going to try and make something to stop the oil from doing this over the winter. Some people in the States use a catch tank with a funnel running down the inside of the filler neck. But, still some people have the problem of oil filling the catch tank after only 15 minutes on the track and then it over flows sending oil in the engine bay and under the car. Not what you want at speed on a track.

Here is a link talking about it.

http://www.rx7club.com/showthread.php?s=&threadid=226214