Does this sound like crankwalk?

[JDR7919]

Ok here is my problems!!
My car stalls all the time if I let the rpms drop too fast. I thought it was just the flywheel but now Im not so sure. I have checked the tps and isc. When I make a "left turn" my clutch gets soft and is hard to go into gear.

I checked my compression and it was 150 120 90 120
I then did a leak down test. It would seem that my exhaust valves are leaking. I could hear air coming out of the exhaust and possibly the rings.
Could the compression being so off cause the car to stall the way it does?
If it is cw would the odds be my pistons are shot as well?



30 over je pistons
Eagle Rods
Balance shafts removed
3" down pipe
3" gm mass air flow sensor
upgraded fuel pump 255 Lph
680 injectors
Ported 16g
Ported O2 housing
2g ported exhaust manifold
act 2600
Fidanza Flywheel
4 bolt
Logger
FMIC
dsmlink

 

[rowlex]

dunno if it's CW, but you can check it yourself with a buddy. Just get under the car push the harmonic balancer toward the trans and have a friend push in the clutch, measure the movement with whatever you can.

(sorry didnt read you ran a leak down test, edited my post).

When you did the leakdown test did you hear anything coming out of the valve cover vents? or the oil dipstick? It would be easy to find out if you drain the oil, pull the dipstick and listen for air coming out the dipstick.

 

[Ludachris]

Unfortunately, the light clutch around left turns and the stalling do sound like symptoms, but you can't be sure until you check for crank movement as Scott suggested above. If there is play it should require little force to move the balancer away from the block and towards the block. You should be able to just push and pull on it by hand. If there is any visual movement, it is almost certain that your thrust bearing is severly worn and is allowing your crank to move (walk).

I would definitely stop driving the car now until you figure things out, but I'm sure you've already done that. Obviously, the more driving you do the more damage that will result if it is, in fact, crankwalk.

 

[1fast97gsx]

With those compression numbers and a few boost leaks as well I'm sure I would expect your car to stall when dropping rpms fast. As far as the soft clutch around left turns .. that's not a good sign. Either way that motor look phuckt anyways with those compression numbers, so I'd look for another 6 bolt.

 

[JDR7919]

Thanks for the info guys.
Its not what I want to hear! I already figured thats what it was though.
I still have to drive the car for now sense its my only ride. Will I get stranded at some point?
Is there away to fix cw? Or should I just get another motor?
My brother has a 6 bot in his parts car I could get.

Thanks guys.

 

[1fast97gsx]

There's no real fix to crankwalk ... you could rebuild it but you'd never know if it's coming back or not. I'd grab the 6 bolt out of his parts car.

From the looks if it you didn't properly align the thrust bearing since it appears you have a built 6 bolt since it's very uncommon for those to have this type of problem. Grab another 6 bolt, throw it in and good luck.

 

[Spoolin4Ever]

Just curious who built the engine and how many miles ago? Looks like you have some time and money into it..?