Ok whats with my motor.
10-29-04, 10:00 PM
#1
Ok whats with my motor.
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?!
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?!
Last edited by The Spyder; 10-29-04 at 10:03 PM.
10-29-04, 11:21 PM
#2
Former Moderator. RIP Icemark.
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.
Additional Vac leaks and a bad mixture could also be clogging your plugs as well as giving you hesitation and occasional knocking.
10-30-04, 02:57 AM
#3
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.)
.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.)
10-30-04, 03:22 AM
#5
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.
Im going to run some mmo through the rest of the gas and see if that can clean some of the carbon out.
10-31-04, 02:54 AM
#7
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.
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.
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