Ni5mo180SX

Well we checked this T2 out last night. It was a 88 model with jspec motor that was rebuilt and had 700 miles on it. While I was driving it, under full gas and past 3krpm the car pulled very hard. Much more then any other healthy stock S4 T2 or S5 T2 for that matter. But the car was completly stock. Over 3krpm the car would hit two stumbles, could this be boost cut or bad TPS?

Well, later in the test drive, the motor seemingly blew. We tried starting it back up, had a lot of trouble. When it was running it was definetly running on 1 rotor with complete lack of power and the 2 stroke sound.

So today, we were informed that the motor actually carbon locked which kept one rotor stuck? After he did the ATF trick, everything was running fine.

I dont think we're trying to be ripped off or anything but the circumstances do seem a bit odd? We intially thought it blew from what we thought fuel cut (It may have been stock but I really dont think it could have been running stock boost with so much power) but could it have been carbon lock?? Thanks for any help guys.

adamlewis

First off, if you blew this guys motor while test driving you better A) Buy the car or B) Pay the guy for a new engine.

Thats just plian messed up.




As for one rotor stopping; Are you seriously asking this question?

Thats like stopping one piston in an engine while the rest move. Its not gonna happen.

Ni5mo180SX

I wasnt driving when it happened.

what happened doesnt seem very probable but wanted to find out some other opinions on what could have happened........

adamlewis

Well you said "later in the test drive, the motor seemingly blew". You never mentioned that you werent driving, so I could only assume.



As for a one rotor stopping while the other rotates; No. Its not gonna happen.

jspecracer7

Carbon Lock isn't when a rotor gets stuck, but when the space between the apex seal and the apex seal ride on the rotors fills up with carbon(thus making it stick) and prevents the seal from sealing to the motor.

If your friend used atf and the car ran again, then he probably unstuck the seal. Also, could have been a fouled plug that does this kind of thing.

DomFD3S

Ni5mo180sx: This is EXACTLY what you're telling me.

"It was a 88 model with jspec motor that was rebuilt and had 700 miles on it."

"So today, we were informed that the motor actually carbon locked."

I know that jspecs are not exactly the best candidates, BUT you did say this was a "rebuilt" motor w/ only 700 miles on it.

A freshly "rebuilt" motor w/ only 700 miles experiencing carbon lock???

What kind of half assed rebuild job was done??? IF I was going to rebuild a motor and I was planning to do a really really cheap rebuild (reusing all seals), the least I would have done was make sure the apex seals, the springs, all the sealing surfaces were clean.

IMO, I'm suspicious of this car. If I was the buyer, I would plan for either a rebuild or acquiring another jspec in the near future.

Icemark

I too would doubt that this is a "rebuilt" motor. I suspect that it is a regular old Jspec, that has a regular old Jspec problems and was installed 700 miles ago.

I also agree with Dom that I would plan on buying a new or rebuilt motor soon if buying that car.

Ni5mo180SX

Well my friend decided to pick up the car but we're still exp. some problems. The car is completly stock but is boosting much higher then stock, Is there a common component failure which causes this? stuck wastegate?

vaughnc

Much higher? I'm pushing 225hp on the stock setup with just exhaust ugprades. That's only 7.5PSI of boost.

You might want to get a boost gauge on there to measure your actual boost levels.

Is the engine hitting fuel cut or pinging?

yearrgh

Check the vacume hoses connected to the waste gate actuator, make sure they are all connected. then check 3 or four more time just to be sure. where is the needle going on the stock boost guage? it should go almost to the top then back off a little as the waste gate opens. if you're pegging the guage, then you've got boost creep or the wastegate isn't opening and you've either got a fcd and the stumbling might be detonation, or you're just running into fuel cut