rx7neube

iTrader: (8)

i was driving home and got on it a little bit from 5th to 4th drove it a little hard, put it into neu. to crused it down to speed. when all of a sudden it dies, so i pop the clutch and started it. which then i noticed that the exhaust sound changed. good thing i was near my house cause when i got there. i put it into neu. to cruse into the driveway and died again. tried to start it back up but would not start. tried and tried again, nothing. cranks but wont turn over. i looked at the plugs and it was flooded so changed it and cleaned it out and still wont start. just to be sure checked the plugs again and sure enough flooded again. does anyone have any ideas? anything would be helpful. btw 94 r2

asianguy02

iTrader: (4)

pull the leading plugs and crank the engine, you should hear three regular popping noises, if you dont, you cracked a seal. or as a better option, go buy or rent a compression test kit and check it that way, three solid even bumps and you should be good and start checking elsewhere for the problem, possibly spark plug coils. either way if the compression test fails, one bump or pop and you lost an apex seal, two and you lost a side seal. in any event a list of mods would be helpful.

JYangS14

I'm new to rotaries, but that sounds similar to MAF equipped turbo charged cars when they pop off an intercooler piping.

rd_turbo

iTrader: (4)

Unfortunately, your symptoms can describe a blown engine as well as a popped hose. Before you do anything else, check to make sure the hoses at the MAP sensor and the fuel pressure regulator haven't popped off. If so, consider yourself lucky, plug them back in and way you go. The MAP sensor is attached to the firewall somewhat above and to the left of the oil filter. Follow its hose right to the intake and make sure it's connected. The second hose to theck is the fuel pressure regulator, which is located at the back end of the secondary fuel rail. This is somewhat difficult to get at from the top. Your best bet is to raise the car and look just above the transmission bellhousing close to the lower intake manifold. You'll see a little round pot and you'll know immediately if the hose if off the nipple.

GoodfellaFD3S

iTrader: (213)

Are all four plugs wet with fuel?

djseven

iTrader: (56)

Buy a $25.00 compression tester, it will give you the answer you are looking for.

rx7neube

iTrader: (8)

thanks guys i will check the compression tomorrow, but cross my fingers its a poped hose.
heres a little bit of background 1994 Rx7 R2 68000 miles, Rotary Power Ca. Miled streetport rbuild at 49375miles A-spec Single Gt35r/40 BB turbo kit w/ full 3" Exhaust Bonez Street-comp clutch & stock 5 speed Trans. Precision Intercooler, Tial Blow off valve & wastegate Power Fc standalone computer W/ Dataloggit software Hks Hi power ignition,Blitz Sbciii boost controller Two in tank Nippon Denso fuel pumps W/ stock filters KG fuel rails W/ AN fittings 1000Pr & 1600Sec injectors.

so is it safe to say that if the compression doesnt fail i didnt blow the motor?

rd_turbo

iTrader: (4)

Yes, it's safe to say that if your compression values reflect 3 even pulses per rotor of at least 90 psi, your motor is not blown. The ideal is higher, but cranking speed and ambient temperature will affect your results.

I didn't realize you weren't running a stock setup. Ignore the part about the pressure regulator location.

rx7neube

iTrader: (8)

thanks guys i did check and the secondary housing is holding almost 100 and the primary is not holding more than 50. so i think that pretty much answers my question. i also found out that there is milk like substance under the oil cap, which i think is a blown coolant seal. correct me if im wrong. i guess its safe to say that i have to do a rebuild. or is there something that i might be able to do with out a total rebuild?

djseven

iTrader: (56)

If it only registered 50 psi on the front housing it is a blown engine with likely two blown apex seals or even possibly 3. You will likely need a good condition housing and rotor as the front rotor and housing are likely a loss.

rxsexen

make sure you also take out the valve and have your friend crank it afew times and watch what the psi goes upto on the comp tester

rx7neube

iTrader: (8)

so i guess my next question is, is there anyone local who can help me pull my motor and maybe rebuild the motor? at least pull the motor so i can send to rotary rebuild? located in nor cal east bay.

rd_turbo

iTrader: (4)

You'll also need to find out what led to this and why the engine failed so you don't go through this again. If you have a garage and a good set of tools (along with mechanical aptitude) there's no reason why you couldn't do this yourself. If you don't have a Factory Service Manual, download it and take your time studying it. It tells you everything you need to know. The ideal will be to get some local (hopefully more experienced) friends involved.

Mahjik

iTrader: (1)

Ask in the regional West section:

https://www.rx7club.com/west-rx-7-forum-193/

rx7neube

iTrader: (8)

thanks guys

rx7neube

iTrader: (8)

dj pmed you and on your website