5.7 Problem please help

[brizzo]

I have a ls1 5.7 it's running but only just really rough and blowing blow smoke. Can any one tell me what's going on ? Please

[VT-565]

Stop putting diesel in it.

[soop]

Does it all of a sudden come good and drive okay?

Then just as randomly turn to shit again?

[brizzo]

Hehe petrol only buddy. No can't drive it it's that bad

[Darcon666]

Blue smoke = Oil burning

Which could mean anything from broken rings, head gasket, vavle stem seals, cracked head... anything that could let oil into the combustion chamber and get burnt, so blue smoke out the rear.

[rydogz]

Stop putting diesel in it.

Haved you checked your oil mate? how about the coolant does it have oil in it?

[brizzo]

Check the oil it's fine that's the first thing I did do. So how do I dignoise this problem ?

[VT-565]

Did the engine just start behaving like this?
Or was there an event that kicked it all off

[2DIE]

Get a V6

[brizzo]

It's a crate motor it's been put it the car sat in the shed for about a year then after driving it for like a months it's done this ? So I can't see how it's a cracked head or any of that. Maybe a sticky valve ?

[Kingston_99]

did you take it easy and wore the motor in? or did you start it up and flogged the guts out of her?

[Not_An_Abba_Fan]

I would never bolt a crate motor straight in. I would strip it and at the very least do rings and bearings . While it's apart, measure and check everything. But that's just me.

[Darcon666]

Check the oil it's fine that's the first thing I did do. So how do I dignoise this problem ?

Simple check you can do yourself are:-

1. Compression test - go buy a tool from Repco/SuperCrap/Autoshite or any good auto shop. Disconnect the coilpacks on both sides, remove one spark plug at a time, insert tool and kick her over a few times. Compression should be between 160-200psi for all cylinders. anything lower and the rings ar farked...rebuild time.
   
2. Valve/rocker/spring check - Remove the coilpacks, remove the rocer covers, bigass sockect and bar on the front crank bolt and turn the motor by hand. Every valve/rocker should open and close @ the same height. If no, remove the rocker, compress the pushrod...it should have some give, no, possibly a farked lifter(Heads need to come off to fix that ). Yes, remove the pushrods and make sure they straight(not bent...), so roll them on a flat leve surface tey should be perfect. Springs - You need a tool to remove them and must have the cylinder at the top of the stroke. if you remove the spring and the cylinder is down... you will drop the valve into the motor and your farked.
   
3. Oil in the radiator - Head gasket=heads off($$$) Cracked head(s)=Replace($$$/1$$$) Cracked block=your farked(3$$$-7$$$)

Seriously... Take the car to a GOOD LSx mechanic...

Disclaimer: I am no mechanic and my anything said here is up to you to take it or leave it...

[RiCeY]

I would never bolt a crate motor straight in. I would strip it and at the very least do rings and bearings . While it's apart, measure and check everything. But that's just me.

You would strip a new engine and do rings and bearings?

[Burnout124]

White smoke is normaly oil . Blue smoke is normaly fuel related injectors could be flooding .

[RiCeY]

Blue smoke is oil, black smoke is fuel.

[Not_An_Abba_Fan]

You would strip a new engine and do rings and bearings?

Who said it was new? It is a crate motor, which can be bought second hand, apart from the fact that it was sitting for a year.

White smoke is normaly oil . Blue smoke is normaly fuel related injectors could be flooding .

Other way around, as RiCeY said.

[trav_304]

does it blow oil out the breather tube if it does got buggered rings or if it blows the dipstick out then its farked. Some thing major wrong. I got the same problem just different circumstances. Do a compression test to confirm it.

[rydogz]

Blue smoke is oil, black smoke is fuel.

Exactly. 2nd this.

[rydogz]

White smoke is normaly oil . Blue smoke is normaly fuel related injectors could be flooding .

white smoke is water mate. not oil.

[Burnout124]

white smoke is oil white steem is water and yes black smoke is fuel

[Not_An_Abba_Fan]

I've never seen a car burn oil and emit white smoke, it is always blue.