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Have a fuel pressure test done on the fuel manifold to check for faulty pump/filter and pressure regulator. run fault codes and look for cam/crank position sensor and /or faulty injectors.
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Backfiring in internal combustion engines occurs outside of the combustion chamber, and is typically the result of an improper air to fuel ratio. An overly lean air-fuel mixture (i.e. an overabundance of air) can lead to a failure to ignite in the combustion chamber, also called a "misfire".
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.
The prevalent cause is the fouling of the O2 sensors in the exhaust pipe and the catalytic convertor(s). This usually caused by the fuel not burning correctly in the combustion chamber. And this can be caused by: bad/no spark in combustion chamber due to weak plugs or electrical going plug coil packs; partially plugged fuel injectors and result being too much un aspirated fuel entering the combustion chamber; bad or old fuel, improper fuel octane for engine.
Suggest you fuel up asap with PREMIUM fuel (for 1 tank) and 1 can super concentrated injector cleaner for next 2 tanks. Check air filter clean. Check air intact air analyser sensor wire is clean, pull the plugs and check condition and gap, replace them if fouled or worn.
What color smoke? White, blue? Blue smoke can generally be pinpointed to bad rings as fuel is get past the piston in the combustion chamber. White smoke could be a myriad of things but usually means there's un burnt fuel in the combustion chamber.
The EGR valve reduces Oxides of Nitrogen in emissions caused by high high combustion chamber temps. EGR allows small amounts of exaust into combustion chamber. This dilutes fuel air mixture cooling combustion chamber
Black smoke: Black smoke is often a result of too much fuel and not enough air in the combustion chamber. In rare cases, it can be weak fuel pressure causing fuel to 'drip' from injectors rather than 'spray'. It can also be caused by weak fire in the combustion chamber.
Gray smoke: Gray smoke is caused by brake fluid. It generally means that your brake master cylinder is bad, and is getting sucked through the vacuum brake hose.
Blue smoke: Blue smoke is generally caused by the burning of an oil in the combustion chamber. Normal causes of oil getting into the combustion chamber are weak piston rings, bad valve guides, bad valve seals, or plugged up engines where oil is sucked back through PCV system,usually due to lack of oil changes
It's possible you have a carbon build up problem. When you try and start the car after the engine is warm, the fuel from the injectors is absorbed the the carbon on the intake valves and combustion chamber creating a "lean fuel" condition.
Try a couple of tank fulls of "Combustion Chamber Cleaner". I prefer the Chevron brand in the black bottle. It is a little more expensive than most but is very good at cleaning the injectors and combustion chamber.
Give it a try and let me know.
Regards,
The operatoin of the glow plugs heat up the combuston chamber before turning over the engine. ONce the fuel hits the combustoin chamber , The fuel will ignite.
The diesel engine only runs on air and fuel .
The glow plugs are basically a resistor that heats up the combustion chamber or pre combustion chamber.
So if the glow plugs are getting power now that the relay is change out , Yes the glow plugs have a major roll in starting the engne.
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