Wankelspeed

Here is a list of what my car is: 87 TII with a J-spec 90 TII engine in it. To get that to work, I had to remove front cover and use the TB, oil pan, and oil pump from the old engine. I had straight exhaust with RB FCD. I also wasn't getting full boost which could be attributed to a possible crack hose, but I didn't have time to diagnose it. I had a leak out of the waterpump gasket, so i was leaking coolant. A/F guage would never read Rich but it would go up to Stochiometric in between Rich and lean . . But enough of that, here is my problem:

I was driving it hard, but only up to 5000 rpm because I would get that Fuel cut like studder under boost higher than 7 lbs. After racing down a couple highways in Buffalo, I had a big puff a black smoke out of my exhaust and then my revs would studder down until it finally stalled out. I had it pushed to the side where I tried to start it, but it didn't start at all. . . My A/F guage was reading near Rich when I was tryign to start it up. I heard the starter turn the engine over but no luck. Eventually it started to make a clicking noise at the front cover while trying to start it up. So I had it towed to my mechanics place but he is too busy to work on it for awhile, so I am hoping anyone here might know of something. . .

My greatest fear is that it had predetonated? Or blew an apex seal. . .To my knowledge, Japan Auto Parts (the people who sold me the used Japanese spec engine) said it had at least 80 lbs of pressure at each rotor. Or it could be small. My mechanic said that a big puff of black smoke could mean that it was fuel unburnt. And when starting it, it smelled really rich and it smoked a little bit. PLEASE, anyone with some knowledge in this situation, tell me something. .

fc3rx7speed

Could you give us a little more information pertaining your car? Like you said you were using a 90 engine in an 87 chassis right? Are you using your stock injectors from your 87, or are you using the ones from the 90? (they are different) Are you using your stock computer, or are you using a 90 computer (they are different)? If you could answer these questions, we could help you find a solution easier.

Wankelspeed

Well here is a list of the things that I can remember that the engine is using from the old engine (86):
Throttle body, Air flow controller (?), Oil pump, oil pan, upper intake plenum, and intercooler. Other than that Everything that was on the new engine is being used for the new engine, injectors, airpump, lower intake manifold engine block, flywheel, alternator. The car is using the stock ECU from the 86. I have one left over hose that was coming off of my plenum of the newer engine that was supposed to lead into somewhere into the new one. ITs just blocked off since it didn't seem to do anything The stock injectors had to be rewired to make it match up. But thanks for replying. . . once again please help! Once again, it just puffed up a big black cloud of smoke and it flooded the engine after tryign to restart it. Fuel was even coming out of the exhaust i think. Oh and another thing, the airpump hose that leads into the catalytic converter was blocked off. . .I didn't understand why my mechanic did that. . .

fc3rx7speed

from what you just said, .....cause you're using the stock 86 computer, the injectors from the s5 jspec may have fried the computer leaving the injectors in open mode, which I think would explain your flooding situation. The s5 jspecs use high impedence injectors (oval shaped connectors). Your stock car uses low impedence injectors(rectangle connectors) Try finding another computer and plugging your old injectors in.

Wankelspeed

Thanks for your reply. . . I will pass this info on to my mechanic who is about to do a compression test. So, if I got another stock ECU, and injectors with an AFC-R, will this help me tune my engine properly and avoid this problem from occuring again?

Wankelspeed

Well, I took out the EGI fuses (2) and pulled out the trailing coil, started it up. . . hss hsss. . .came out. . .ok, theres compression at least, tried the rear housing, and no hissing. . .I guess it sounds like no compression whats so ever. . .sigh. ..