Injector seal replaced as it was blowing, could this of caused any damage to the injector or further into the engine like a piston etc.?

Check stored ODBII codes for injector circuit high/low faults (P0200). Implies a injector control wire short or failing injector. Further troubleshooting is required, test don't guess.

Check injector #2 control wire for signs of abrasion or rodent damage. Use an ohm meter to compare resistance of number 2 injector to other injectors. Search internet for how to... plenty of videos.

It's your piston rings not sealing properly in the piston bore

Most likely cause is the fuel injectors are leaking, what ks the make model and year of the vehicle

Yes this is correct, you can get important information from the colour of smoke from the exhaust:

Blue/Gray Smoke: Blue/gray exhaust smoke is an indication of oil burning in the combustion chamber. These are possible symptoms and causes:
Valve Seals: Leaking valve seals will cause blue/gray smoke at startup because oil leaks past the seals into the cylinder after the engine shuts down.
Valve Guides: Excessive clearance between the valve stem and the valve guide allows oil to leak past the gap into the cylinder.
Piston Rings: Worn or damaged piston rings will cause blow-by resulting in blue/gray smoke.
Worn Cylinder Walls: Worn cylinder walls cause blow-by resulting in blue/gray smoke.
PCV System: A stuck closed PCV valve will cause excessive crankcase pressure resulting in blue/gray smoke.
Black Smoke: Black exhaust smoke is an indication of a rich fuel condition. These are possible causes:
Fuel Injectors: A leaking or dripping fuel injector will cause a rich fuel condition.
Fuel Pressure Regulator: A stuck closed fuel pressure regulator will cause a rich fuel condition.
Fuel Return: A restricted fuel return line will cause a rich fuel condition.
White/Gray Smoke: White exhaust smoke is an indication that coolant is burning in the combustion chamber. These are possible causes:
Cylinder Head: A crack in the cylinder head (around the coolant jacket) will cause coolant to enter the combustion chamber.
Engine Block: A crack in the deck of an engine block near the coolant jacket will cause coolant to enter the combustion chamber.
Head Gasket: A damaged or blown head gasket will cause coolant to enter the combustion chamber resulting in white/gray smoke coming from the tailpipe.

• Leaky Fuel Injector Symptoms

1. Minor Amount of Gas
   • The piston rings are seals placed tightly against the cylinder walls. These piston ring seals prevent the gasoline from flowing past the pistons and down into the oil. They do not, however, provide a perfect seal; thus, a slight amount of gas will find its way into the oil as a normal occurrence. This amount should be extremely minute, and such a small amount does not change the oil enough to cause any damage. Changing your oil every 3,000 to 5,000 miles or every three to five months ensures that it does not become a problem.
     Two ways to tell if you may have a problem with gas in your engine oil are:
     
     1. If you start to smell a strong odor of gasoline while you are driving.
     2. You notice white smoke coming out of your tailpipe.
     If a large amount of gasoline does get into the engine oil, change the oil immediately upon fixing the problem that has allowed this to happen.
     
   Excessive Fuel
   • When a fuel injector is stuck open, the fuel will flood out. Gasoline will definitely get into the oil when this is the case.
     If the fuel pressure in your car is too high (above 7 psi) that may cause gasoline to get into the engine oil.
     Gas could also leak into your intake manifold if there is a carburetor problem.
     An inoperative injector system can also cause this problem, because if the engine is not firing appropriately, the gasoline will end up running down the walls of the cylinders.
     Check to see if the float in the gas tank is rising the way it should be rising or if it needs an adjustment. You will not be able to look at your gas gauge and get an accurate reading If the float is not functioning properly.
     Your engine may be running rich, with too much gas going into the engine and too little air.
     Check to see if the oil level might be really high. This can also cause trouble.
     
   Check Piston Rings First
   • Any time you realize that too much gas is getting into your engine oil, you should replace the piston rings and then replace the oil. See if this helps the problem, and if it does not, then investigate the many other possibilities as to why the fuel is leaking into the oil.
     Perhaps at this point do a compression test. Otherwise you can try getting your fuel injectors tested. Also check your spark plugs to see if they are good or if they might be misfiring.
     

Read more : http://www.ehow.com/how-does_5003081_gas-engine-oil.html

Your first mistake is thinking that the only thing that can cause a misfire is a coil or spark plug. Misfires can be caused by MANY things, including faulty fuel injectors, injector control circuits, blown head gaskets, vacuum leaks, burned valves, broken valve springs, low compression due to cylinder damage, worn piston rings, damaged or worn camshafts, etc..

I would recommend getting this problem properly diagnosed by a professional. Failure to fix misfire codes promptly can cause severe engine damage and destroy high-dollar parts like oxygen Sensors, catalytic converters, engine blocks and cylinder heads.

FIND THE CAUSE BEFORE YOU JUST REPLACE THE PISTON AND RINGS. MOST LIKELY TOO MUCH HEAT FROM CLOGGED FUEL INJECTOR. COULD HAVE INGESTED SOMETHING THAT DAMAGED THE TOP OF PISTON TO START THE PROBLEM. COULD HAVE OVERHEATED ALL OVER, BUT ONLY #1 WENT FIRST.
I WOULD FIND THE CAUSE BEFORE FIXING WHAT HAPPENED.
TAKE THE INJECTORS TO LOCAL INJECTOR SHOP BEING SURE YOU KEEP #1 SEPERATE AND TELL THEM WHAT HAPPENED.
THE DIESEL FUEL INJECTION REPAIR SHOP CAN USUALL TEST THESE TOO.
GO TO THE SHOP THAT REPAIRS INJECTOR AND PUMPS, NOT THE PLACE THAT WORKS ON BIG RIGS.
HOPE THIS HELPS, ROBERT

Bulletin No.: 03-06-02-005B
Date: November 18, 2004
TECHNICAL
Subject:
Engine Coolant Loss with No Visible Leaks (Reseal Injector Sleeve)

Some owners may comment on engine coolant loss with no visible leaks. Excessive white smoke or a coolant type odor coming from the exhaust pipe, along with low coolant levels, may indicate coolant in the combustion chamber.
Cause
Condition may be caused by engine coolant entering the cylinder due to a dirty or damaged seal between the fuel injector sleeve and the cylinder head.

If it's black smoke, you could have a faulty or dirty EGR valve and may not be closing 100%. Remove the EGR valve and clean it with spraying carb cleaner and reinstall after inspecting the valve can move without any binding. Goo luck and hope this helps.

1 Inspect Piston Ring Set Worn or broken piston rings. 2 Inspect Valve Stem Seal Cracked or brittle valve stem seals allowing oil to enter combustion chamber. 3 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders 4 Inspect Fuel Injector Rich injector 5 Inspect PCV Valve Plugged or damaged pcv valve. 6 Inspect Engine Worn or scored cylinder block 7 Inspect Piston Worn or damaged piston. 8 Inspect Valve Guide Worn valve guides

Hello thank you for choosing FixYa.com here are a few things that would cause the black
smoke and stalling.
1 Inspect Piston Ring Set Worn or broken piston rings. 2 Inspect Valve Stem Seal Cracked or brittle valve stem seals allowing oil to enter combustion chamber. 3 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders 4 Inspect Fuel Injector Rich injector 5 Inspect PCV Valve Plugged or damaged pcv valve. 6 Inspect Engine Worn or scored cylinder block 7 Inspect Piston Worn or damaged piston. 8 Inspect Valve Guide Worn valve guides