OK SO I JUST BAUGHT A 2001 FORD FOCUS AND HERE IT IS THREE DAYS LATER THERE IS A VERY LAUD TICKING RATTLING SOUND FROM UNDER THE HOOD BY THE ENGINE THE OIL IS FINE AND NO LEAKS AND WHEN YOU START IT ITS BOGS AND DIES SOME TIMES ITS LAUD HELP MY HUSBAND THOUGHTIT MAY BE A LIFTER BUT HIS DAD SAID HE DIDNT THINK IT COULD BE THAT
It very well can be that depending on the severity of the ticking noise, if it sounds like its coming from the top of the engine, place your hand on it only when you first start it up and if you can feel it knocking slightly and if the noise dies away once warmed up id say its your lifter, if its a heavier knocking rather than a ticking and comes from below or bottom end of engine it may be big end bearing, not good. try putting some engine treatment through the engine oil and make sure you run it in as directions state then change the oil and filter and see if that helps :)
There are some metal brackets that wrap around your lifters. They get old and brake pull the valve cover off and see. Spi engines is 3 bolts on valve cover and the engine mount on the left. Make sure to put a floor jack under the oil pan to hold the engine up.
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I had a 1984 Mustang 4 cylinder that match the symptoms of your Ford Focus. I found that it was the core inside the catalytic converter had broke up and started to rattle. Not saying this is your problem but a possibility. Another possiblity, exhaust bumping the body of the car. The wer wer wer sound you hear going over uneven ground is probably not related to the other mentioned. It sounds like the four wheel independent suspension adjusting to the terrain. Cool temperatures help promote this noise due to rubber bushing that your vehicle has in the suspension areas. Annoying, but considered normal. Hope this points you in the right direction and helps. Let me know what you found. Later, Todd
Te first thing to do is to locate the noise source. You can do it with a long screw driver touching the tip on the engine and the holder at your ear. A needle stethoscope can do the job better. The noise might be a overhead cam tick, crank shaft knock, bad bearing or anything else.Hope this will help to narrow the problem.
4.0l's are notorious for valve rattle on cold start-up. There is really nothing you can do to make it go away short of completely replacing the valve train in the top end, and that isn't a permanent fix. It's is an top end oiling issue from the factory. Just don't race your engine on cold start-up until the rattle stops.
The rattle in the transmission sounds to me to be more of a loose dust shield/heat shield around the transmission or exhaust than a mechanical issue.
Are you sure that the noise is a rattle? lifters make a ticking noise, pistons, piston pins and bearing rattle, lifter tick goes away in seconds, piston and bearing related noises take longer, and in the case of rod bearing not at all, it sounds like you may have piston noise, and in that case I would not worry about it, I would run a few cans of combustion chamber cleaner with you next 2 fill ups, carbon build up on the the # 1 piston ring land can cause the piston to "rock" in the cylinder and make a rattle type noise. I have a 1996 Corvette that has a rattle, it is a piston, GM checked it and told me not to worry about it, of course that advice cost $50.00. Also this type of noise is common to the later production 3.8L V6. Hope this sets your fears of a large repair bill to rest, just drive it, but make sure you use the correct oil and change it when recommended.