I tore down my car today and have the motor hanging by the hoist. Last week I did a compression test on it with a piston engine tester and was getting 50-50-50 on the rear rotor. The motor was warm. I got 95-95 on each rotor warm though if I dint hold the check valve. Even now if I crank it over but hand, I get a real nice strong pluse out of each rotor.
It has been running horrible, smoke on startup (just recently after running water through it- I think it was just condensation). If you step on the gas wrong, it hesitates, goes no where, and builds boost then runs fine. I had hit detination on the freeway about 2 weeks ago now, right after I swaped turbo's around. I figured crap, I poped the motor. Before this it was running great minus the idle, even after wards when I would hit boost it ran great. I search for vac leaks and found one today I never saw before, a hose I replaced had blown off. I also checked the timing which was a bit off, but after a quick adjustment was back to normal.

Now I have torn down a bad motor with oil seals gone, mine shows no sign of that and looks like its been running rich. The rotors are covered in carbon worse then anything despite running 2 gallons of water through a warm motor. My plugs were also covered in carbon.

Do you think I should get new plugs, toss something in there to eat the carbon away, and re install the motor since I fixed the hose that blew off?

Would one vacume leak from a intake manifold give me this bad of hesitation? Or should I just rebuild the darm thing .
I put a high power light and mirror through the exhaust ports and could see NOTHING wrong with the housings, the rotors, or the seals. I thought if I had blown a seal I might see markings on the housing. Or atleast on the rotor?!

 

95 PSI is rather low and what I would consider rebuild time.

Additional Vac leaks and a bad mixture could also be clogging your plugs as well as giving you hesitation and occasional knocking.

 

Well I tossed it back together because frankly I have nothing else to do .
Its 1am, dont want to wake the folks, so tommorow we will see whats up.

I already know I forgot 1 sensor, made the ecu beep at me and the fan stay on when I turned the key. (its the electric fan thermosensor.)

 

wake them up !!! i just started my half bridge and i know they can all here me . how is your idle?

 

My idle was normal at startup. 900-1100. Every once in a while my yet removed thermo wax will give me a 1500 pulsing. BUT it would get warmed up and hold a 650-900 at best. Only happened 2-3 times but still.

Im going to run some mmo through the rest of the gas and see if that can clean some of the carbon out.

 

ouch, i hope that's not what i'm looking foward to when my injectires fire off :0!!!! eeep!

 

Well I will be damned.

Put it back together, fired it up, and bam! It runs great. It still is going to need a rebuild, but my hesiation is completly gone.

My 1500 pulsing idle and 6.5k rev limit under load is still there, but it runs and drives.