My 8 had stalled since 4mths back. All the mechanics here in Brunei claimed the engine had lost compression. Do i need to replace to new engine or rebuild it or any other option? Engine is hard to start since i remove the cat converter. after a while i drove the car, idling drop drastically, resulting in idling problem. After sometime i manage to start the engine, since the idling is not good so i press the accelerator for around 15mins. Smokes coming below the car & i found the the rear o2 sensor wire is melted.

Really need u guys opinions to solve this problem. Thanx

 

Oh btw, lists of mods :

HKS RS Kit, HKS Legamax Muffler & Custom Pipe (replace cat). Adding more info, i've checked the spark plugs. Rear plugs are wet but front plugs are dry. Is it possible the front rotor ain't working or there's something problem with the MAF sensor??

 

You do need a special tool to check the compression on a rotary engine, however if the shop told you that its lost compression, the engine is probably done for. If its under warranty, you should try to get it replaced, otherwise the engine needs to come apart to see if it can be rebuilt or not.

Take it to Mazda or a rotary specialist and get the compression numbers for each face of the two rotors. My guess is that you have lost compression on at least one rotor, meaning the engine is shot.

 

Please read the thread on the thermal damage recall https://www.rx8club.com/series-i-trouble-shooting-95/recall-thread-mnao-suspend-rx-8-deliveries-66002/

Sustained high RPMs at a standstill can damage the underside of the car including the gas tank. I don't know the status of the recall in your country but you could have heat related damage. It may not be related to the engine problem but you should have the dealer look at.

Good luck.

 

Try to take some good pictures of your spark plugs and repace them while your at it if you haven't already done so. I'd like to see what your old ones look like. Part of your description sounds like a flood condition which will definitely act like and literally reduce your compression.
Paul.

 

Is yours an automatic?

Do you have only 1 oil cooler?

I think that the climate by you is similar to Las Vegas in the US. We have a rash of blown engines there.

 

Nope. 6spd MT. Only a single stock oil cooler. Could be becoz of the climate but my engine's not blown. Any idea mate?

 

Yo blue!! Thanx 4 the thread. My feeling said that i'm having this heat related damage. The dealer won't give me warranty/engine replace since i've void it. But hopefully they could do something about it (dealer don't have any rotary speacialist).

 

i've change to new spark plugs be4 the car stalled. 1stly i thought engine was flooded. I tried the deflooding procedure but it won't help. maybe i'm too late to tackle the problem since it's having the hard start problem for around 1-2 mths after i made the modification.