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My 2003 ford focus engine is making a noise kind of like a growling noise I wonder if its the timing chain?? its especially noticeable when the car is cold it gets quieter when it warms up
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The growling noise that you are hearing when you accelerate is likely caused by a problem with your timing chain. The timing chain is a critical component in the engine that helps to synchronize the movement of the pistons and the camshafts. If the timing chain is loose or damaged, it can cause a growling or rattling noise, especially when the engine is under load. This can be a serious issue because a faulty timing chain can cause the engine to misfire or even fail. If you are hearing this noise, it is recommended that you have your vehicle checked by a mechanic as soon as possible to diagnose and repair the problem.
The car would not start if the chain had broken,pure nonsense
The plastic guides may be worn & the tensioners gunked up
Chains seldom break,belts break
Did your mechanic do a cylinder leak down test
The more I read questions on this site,the more blessed I feel, that I never in 49 years, needed professional help,they don't do much & very well at not much
The mechanic should have a data base to know if it is an interference motor,not tell a customer things that upset you & speculate
Look up the info & test,do something positive,like actually road test a car with the customer driving
Sounds like you lost oil pressure and possibly the engine is shot due to losing pressure. It's possible the timing belt/chain broke. Even if this is this is the case, usually it requires valves replaced and head rebuilt/replaced.
Could this of been caused by the air filter box and cover not being installed correctly or is thee noise still there after you installed it back,? if its still there then something is wrong the poping noise is a small back fire threw the intake, may be a bad coil or crossed sparkplug wire,i would have this checked asap.
Take all of the belts off for a short run at idle. If the sound goes away it is pulley related, spin each pulley and listen for bearing noise, also check for play at this time.
If the noise does not go away when the motor is driving no accessories you have a more serious problem.
catalytic converter is probably rattling, they do that when they are on the way out, performance will be effected, as it block's, engine cant exhaut properly !
You can wait its just fine, However if you ever start to notice oil leaking from front cover, then you will need to change. If there is no loss in power feel sluggish especially on take off, Its almost impossible for these type of chains to break. So enjoy until the wheel fall off..lol. good luck
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