Blown or Not Blown?
 

Ok I am really confused if my damn engine is "blown" or not. I am quite sure it isn't blown but I need some diagnostics of certain things. How would it run if it had a stuck apex seal? bad O-rings? Bad compression? Please tell me this because my 89 N/a GTUs isn't helping me all that much. Plus I need to know if I should rebuild it myself or should I just get a damn new motor? I want the experience with the rebuild however; it took my friend a long time and a lot of money in tools. Should I buy a video? And if I did would it cover most of the shit? Or is there a book out there that will tell me how to do it. JUST GIVE ME SOME DAMN HELP PLEASE!!!!!!!!

I also have this problem. I don't know weather or not my engine is blown or running rich cause of a stuck injector.
My friend who saw my car listened to my car and said that it doesn't sound blown and it actually souned healthy and is acting up like its flooded.
Ppl been telling me to get a compression test done by Mazda and that will ultimately tell you whether or not its a blown engine.
Btw, I totally would recommend an experienced mechanic to do the rebuild. Everything else you could do by yourself.
Good luck

you don't need mazda to test it, just go buy a cheap psi tester from a local store. 90+ psi is good. under 90 is weak. and 0-60 is blown.

Mine runs great and eccelerates strong, besides having a damn hole in the muffler which is causing some backfiring whic I think might be the injector. I need more info though

if it starts, runs, and accelerates on it's own it's not blown.

what if it accelerates like shit?

this i would like to know also

with out doing a compression test
what are some good ways to decern if a engine has broken/cracked a apex seal.

I use to own a 1st gen
and when I blew the motor

It would only turn on after putting some ATF
it would accelerate very slowly
it make a mad purring sound

like prrrrrrrrrrrrrrrrrrrrrrr left of gas hit gas again prrrrrrrrrrrrrrrrrrrr

Now I bought a TII that the owner said he did not know if it was blown or not "runs rough" what he said

Well after putting my injectors in it, cause it did not have them on

she cracked on
and seemed to sound ok no lawn mover sounds or purring
havent had a chance to really test it
the started died.

Re: Blown or Not Blown?
 

Actually there is a great video from one of the vendors... Atkins I think. You should get that and watch it... again and again, until you understand EVERYTHING they are doing. Then, keep it handy when you are in the process, so you can refer back.

As for tools, there aren't many special things required. 2 1/8" socket for the flywheel nut... and a BIG breaker bar, or better yet an impact wrench... pilot bearing puller... (that one is about $100, but you can "rent" them from some vendors... RP (rx7.com) will do it locally, but I'm not sure about shipping a rental.) You'll need normal feeler gauges, etc... and basic hand tools. A rotary is not nearly as hard to rebuild as a piston engine.

So what do I do if it is running a little rich, which it might be doing. Change the fuel pump/filter. I can do this it isn't hard and I have everything. I have what looks like the fucking stock battery, could this be doing it? Should I ground the ECU more, this is what I don't know, how do I do this? Anything and everything helps people, I really could use the help and thanks for the people that have already replyed

RRRRRRR,,,, Come on guys I need some damn help, I want this thing running great by this summer. Just tell me what I need to look for and I will do it. If not the damn thing is going to sit for about 4 years so I can go to college. So please help!!!

Get a compression check. Thats the only way you can tell if its blown.

Do a compression check, you can buy a gage at your local auto parts store. pull the plug on your crank angle sensor, screw the gage into the #1 leading plug hole (front rotor) and have someone turn your engine over. If you have a relief valve on the gage you need to hold it open while doing this, you should have 3 pulses, you can find out in your manual what the pSI should be. Then check the #2 leading plug (aft rotor) and do the same thing. If you have a blown engine you will not get 3 pulses at each rotor. There is a big difference between low compreesion and a blown engine. I had a blown apex and had no pulses from my aft rotor, it was just blowing by right out the exaust which made the cat cherry red and ran like shit bucking vibrating stalling while at a stop, very hard to start (No Compression) Here's a clue These cars need good compression to start. You need the right amount of fuel, oil, air for good compression. Check your plugs for fouling, try the ATF trick to clean the carbon and increase your compression. Hope this will help. The manual will give you a lot of this info for trouble shooting and compression checks. Oh, one more thing save yourself the headaches buy a rebuild. Hope this helps. Gary

Sorry to say it but it sounds like you're really not qualified to get the car running great by summer without some help. It's pretty hard to diagnose a car you can't hear or see. Find a rotary specialist somewhere near you and get it diagnosed, and maybe even adjusted. Could be that a simple adjustment by someone who knows is all it needs. Saving money is great but it can be taken to the point of ridiculous.