YakATK

I have searched alot about this but could not find a definitive answer to what I am wondering. I will explain in detail what has occurred in past couple of days.

My car has been running EXTREMELY rich for sometime now, but I had it off the road for a bit. I just got insurance again yesterday. I then noticed an autoshop add that said they specialize in Mazda and GM cars so I figured I would go there and see what they are like seeing as how I needed a tuneup and they were litterally within walking distance of my house. I asked the guy if he knew much about rotary engines and he said he worked for Mazda for 10 years and has rotary engine training and has done work on them and such. But I do not know how good he was or is with rotary engines. So he did a compression test and told me I had low compression on #2 rotor. I asked what the numbers were and he just said about 40. In the dissapointment of it all I did not think to ask what the other rotor was at OR what he meant by just saying 40. Should he not have told me 3 different compression readings? Anyways, I took car home and cancelled insurance and such.

Here is what I am wondering though. Seeing as how I am running EXTREMELY rich, like I get about 220km to a FULL tank in my 90NA(think that is about 130-140miles or so). Does having low compression like that cause the car to run rich like that? It does not burn oil or lose coolant, well actually it loses a bit of coolant but not anything major, I don't have to top it up every week or anything like that. When it was on the road I whent like 1-2 months before topping it up. Also, would running that rich cause it to show really low compression because the gas is making it hard for the seals to seal properly? The engine will not idle any lower then 950rpm without trying to stall out, usually idles around 1k-1500. When you feel the exhaust coming out the pipe it comes out in really fast pulses, not smooth. Feels like clapping really fast and really light. It is pretty gutless as well, acceleration in 1st/2nd gear is not as bad as 3rd/4th gear but still fairly poor. If I floor it the car does not accelerate any faster then at half throttle, but it does sound louder like it is trying harder. Unless it is flooded which it sometimes does it tends to start up pretty easily, like crank crank vrooom type starting. 5th gear out on the highway does not work no matter what speed your going, it will either accelerate REALLY slow or bog down and not at all. But in 4th gear I can get up to 170km/h (about 100mph) but it takes a while to get there, about 20 seconds from 120km/h to 170km/h. Maybe 30 seconds even, cannot remember cause only done it once and it was very dumb to do. When I bought the car it had sat for a long time but before I even tried cranking it over I did the ATF treatment to it and put new plugs in and such.

My mods/changes to car are as follows:
Removed cats except the 1st precat, straight pipe back from it to a SS muffler.
Cone filter intake.
MSD 8.5mm wires.

Have not bothered with anything else cause I needed to get this problem looked after but then had to take car off the road so have not gotten around to it till now.

Does this sound like a toasted rotor to anyone? Or is it other problems causing this to appear to be low compression? Any help would be great cause I am not sure how knowledgable that mechanic was or if he even did the work or if one of his workers did it (he owned the place and from what I could see did all the paper work scheduling things and had employees doing the mechanical work.)

Thanks to anyone who has any info to help me out. I will be buying a new core if this turns out to be poor compression.

RotaryWeaponSE7EN

iTrader: (6)

First 40 is low and that means either try the atf trick or rebuild. Your choice. Just look up atf and it will tell u everything. Good luck.

kllntyme

The mechanic should have given you three readings. If two are low then you have a bad apex seal. If one is low, then you have a bad side seal. If you do the rebuild yourself, side seals are cheap, apex seals are not.

dr0x

He could have done the compression test wrong. Cold motor/didnt have the throttle wide open.

YakATK

alright, well I am gonna call him back now and ask more questions for sure, cause his exact words were:
It has almost no compression on #2 rotor
then I asked what the numbers were and he said:
"about 40"

those were exact words from him.

Oh well.....I might just buy a rebuilt street ported engine from a place anyways and restart from scratch, get all new sensors and get all my parts cleaned that I would be swapping onto the new core. Thanks for the replies.