hey guys, welcome to my nightmare

Driving home today on the freeway, accelerated from 90-100km/r, and the car coughed and spluttered shitloads, i couldnt keep a constant speed. When i clutched in the engine actually stalled. I pulled off, took the plugs out, covered in black ****... very thick... so i got out my trusty knife and cleaned em up as good as i could.

Tried to crank it, it finally went after some pursuasion, wouldnt hold an idle and it sounded like a normal rotor, not a bridgeport.... no brap brap brap just brrrrrrrrrrrr. I checked i have spark on every plug, it all seems good. i raised the idle and got her to idle steady at 1500.

I decided to drive it home, had some power but not lots, when i started to get some speed i could feel and hear the occasional brap ish sound like the other rotor was trying to kick in, lots of backfires and the such.

So now its home, i clean all the plugs properly. Have the plugs in the front housing, none in the rear.. crank it... hear phut phut phut, and the engine starts to run. Put plugs in the rear, none in the front... phut phut..........phut phut, engine wont run. Checked the timing, its a little off but i wouldnt think its anything drastic.


PLEASE PLEASE TELL ME WHAS WRONG????????? ive got till friday to try and fix it and then its time to drop back in the stocker 12a.

heres what im running atm
12a Bridgeport (run in 750km)
48ida webber (not tuned properly, smells like its running rich)
std clutch etc
std seals (mazda rebuild kit)
s2 elect ign
br8et plugs
facet fuel pump (supplies enough for the 4000rpm limit, starts to die any higher)
8mm leads
not sure on coils.. one is bosch, other i dunno.... i seem to have spark tho


any suggestions??
I will ook into getting it comp tested, but for now i want to try everything possible to fix this. if ive lost a seal ill have to swap engines again


Thanks in advance for you hel
-James

P.S. sorry for the long post

 

Probably a corner seal. If you lost a apex seal it would be more like, whiiir, whiiir, phut because one seal has to seal two sides.
Wait a minute, is your discription backwards? You say with plugs in the front you hear 3 whooshes and it runs?

 

run some powerfoam through it
with that much carbon on a plug
a stuck seal is within possibility

 

I'd guess the a side seal is sticking, and would do somthing to clear some carbon out (MMO, ATF, Powerfoam or eqv.). But you have to ask why was the plug so black with only 750 km on the engine? Either you are running rediculously rich, for plugs are too cold, or you're burning oil at an incredible rate. If its rich, lean it, if the plugs are too cold (I don't know what's good on a bridge) change them. But I'm affraid if the ATF/MMO treatment doesn't work, or the engine is going down on the oil, you are going to have to pull it apart to find out what happened.

 

right
i stuck apex due to a bad carb running rich
only took 500 miles

 

right
i stuck apex due to a bad carb running rich
only took 500 miles

 

Ok first off... no my description isnt backwards... it seems to run on the rotor that doesnt sound right, but wont run on the one that sounds ok.

I know its running rich, well it smells very rich, so it could be the problem.

so what do i put in it??? could just some oil down the manifold clear it?? or some wd40 (magic oil that is used to free jammed hinges etc). I havent heard of the products you mentioned.

cheers for your help

-James

 

get some diesel ans mix it with gas
half and half should be similar to MMO

but wait for someone else to agree/disagree

 

seems like a stuck seal too me too. With a bridgeport u should do ur regular high RPM runs to make sure you brun all the carbon specially since you are running so rich.
As it was stated try using some MMO for 24hrs+ and see what happens. After try doing some high rpm pulls and maybe seal comes free.

 

ATF = Automatic Transmission fluid
MM0 = Marvel Mystery Oil.

Basically you need something to soften the carbon build-up, but won't distort the rubber water, and oil seal o-rings.

 

-----And the sun shon upon my RX-7 and it was good-----

I drover her to work today coz i was goignt to take it to a wrokshop for compression testing. It started on 1 rotor, running really crap, warmed it up, got about 50 meters down the road.. coughing and spluttering... then *BANG!!!!!* the loudest backfire ive ever heard, and im sure i heard metal in the explosion (my imagination), i was shitting myself, and dived for the ignition key.. about to turn it off when i noticed a brap brap brap brap..... WOOHOO it freed it up. I played witht he tune a bit, leaned it out a bit (still rich tho) and its running beautifully.... this arvo i gave her a 5-6000rpm go for a little while to clear some carbon, i cant go much higher coz its not tuned and its still being run in.

I just wanted to thank you guys for your help and quick response. I was going to go out and buy some oil n stuff and start troubleshooting, but it all changed for the good

Thanx again

-James