80/TA/LT1

iTrader: (2)

Well, I've never seen this happen, but last night I went to start my turbo 5.3 which was running fine and it backfired really loud through the intake and wouldn't turn over anymore. I hoped it was a starter/ flywheel issue but it wasn't. I could turn the crank with a breaker bar but only counterclockwise, when I turned it back clockwise it kept getting stuck in the same spot. Is it possible I bent a rod just from that single backfire?? I didn't check it out any further yet cuz I'm so 😡, ugh, il probly pull the plugs tonight, really didn't think a pop when starting would screw me this bad, figured it would happen when I was beating the nuts off it, any insight is appreciated thx guys

671blownlsx

Ya pull plugs then try and rotate..

80/TA/LT1

iTrader: (2)

What else do you think it could be? Broken plug in the cylinder? Or bent valve? I'm at a loss right now, there was no strain on the motor, sounds like major damage from a backfire, although it was loud, like a 9mm going of...

671blownlsx

I would be surprised if so..do you have electric fuel pump..maybe you filled cylinder with fuel and locked it..
Have to pull plugs see what comes out then if nothing remove valve covers check push rods

Old Geezer

iTrader: (3)

Broken crank............

80/TA/LT1

iTrader: (2)

Yea walbro 450, ok gonna look now

KCS

iTrader: (20)

Not enough info to really say for sure, it could be almost anything.

Chances are, you're going to have to pull the engine and rebuild because it sounds like there's some serious internal damage, but you could narrow it down before you pull it. I would start with the plugs and see what they look like. Usually a ground strap will be closed up for damaged on the cylinder(s) that had something failed.

You could also pull the valvecovers and look for any dropped or stock valves, broken valvesepings, etc.

671blownlsx

Don't pull unless needed check easy stuff first

80/TA/LT1

iTrader: (2)

Well number 8 cylinder poured gas out, sticky injector? More to come only two plugs out.....

80/TA/LT1

iTrader: (2)

Ok cyl 8 was loaded with fuel all plugs are out and the motor turns, I'm gonna spin it to empty the cylinder, put plugs back in cross my fingers and hope all is well

671blownlsx

You be ok mostly likely..change oil too because oil pan is probably got gas in it to..

671blownlsx

don't want to keep cranking a fuel injected motor you'll fill your cylinders up with fuel every time you crank it and it doesn't start it's just loading it up

RockinWs6

All is well? If that cylinder was full of fuel you at least have a bad injector. Stop and at least pull the injectors, spin the engine over and check compression.

80/TA/LT1

iTrader: (2)

I pulled the fuel pump relay

KCS

iTrader: (20)

Hopefully it didn't hydrolock the cylinder.

80/TA/LT1

iTrader: (2)

checked compression in cyl 8, its 140, gonna order a new injector tonight

Old Geezer

iTrader: (3)

All. Not just the 1 you think is hung up.

80/TA/LT1

iTrader: (2)

Well, compression checked ok. Aired out the cylinders a couple days. Replaced #8 injector, started it and it's knocking, man wtf ??? I really can't believe this ****... I'm gonna pull the valve covers to take a peek, but I'm pretty sure it's a rod, fml.....

Floader

iTrader: (32)

I have seen two motors break rods on start up because the injectors stuck. One we pulled the head and pan and put a new rod/piston in that hole..... the other one window'ed the block. I have taken to pulling the fuel rail off of these junk yard swaps with the injectors attached to make damn sure none are leaking.

NHRAFORMULA00

iTrader: (2)

dont start it anymore, it has a bent rod