AlwaysCode390

I havent had time to do anything besides try to start it and look it over for holes, lol.

I was going 25mph , shifted from 1st to second then BOOM (exhaust backfire I think) and the cop said a BIG puff of white smoke out the exhaust.

No holes or leaking of fluids.

When I try to start it , it cranks WAY faster than normal. It backfired one time, pretty small ... out the exhaust after about 30 seconds of cranking (that should rule out the opti right?). If its the head gasket check the oil?

Does it sound like a busted timing chain? The guy told me it was replaced, but he has lied about other things ... and the car has 143k miles.

If it is the timing chain did I damage the internals? I have all new ones purchased already for my le2 build that I keep stubbing my toes on. Now is a great time to get that installed, hahah.

Thanks for the help ---

mrmint69

Sounds like you have it figured out. I would check to see what is broken before you start it again. I would guess your ok if the timing chain broke and thats all.

Stl94LT1

It doesn't sound like a timing chain.

Jazsun

I'd rotate the crank and check that all pistons are moving by removing the spark plugs and putting some rope in there.

95LT1conv

Sounds exactly like the timing chain to me

95LT1conv

Depends on whether th LT1 is an interference engine or not. I know when the chain let go in the 3.1 in my Cavalier, a piston came up and slapped a valve.

https://www.camaroz28.com/forums/sho...t=timing+chain

Dave1980

Just pull a valve cover and see if the rockers move when cranking.

dre2013

you could've blown up your opti. friend of mine did that a few times and the same thing happend. try checking for spark, or get on shoebox and do the opti test

Dadic 78

Mine did something similar when my opti died recently. I was going about 35MPH at the time, and got some KILLER backfire. Don't know about the smoke though. Try a scan, see if you get the lo-res pulse code for the opti, or pull a plug, ground it, and test for spark.

rwing7486

Thats sounds like exactly what happened when my opti went, i was going 90MPH down the interstate and then it sounded like a shotgun went off under my hood and white exhaust came firing out the back. Check to see if ur throwing sparks where it shouldnt be going, and i also recomend some new MSD cords and new plugs

1963SS

Well what was it? The suspense is killing me. A mighty boom and a puff sounds about right if you're talking about a cannon but it sounds not so good for an engine. The booms and puffs are supposed to be inside the block.