Loud noise under acceleration indicates a failed big end bearing or main bearing
have a oil pressure check done
remove the injector for that piston and if it stops the noise then consider a replacement engine.
SOURCE: clanging noise while running
A rhythmic metal on metal noise in an engine usually follows a classic rule: valves tap and pistons knock. If the noise is rhythmic with the speed of the engine and incrementally increases when the engine speeds up, then it is one of these two issues. All you need to answer in this case is whether your noise is a tap or a knock. On the other hand, if the clanging sounds more like an old diesel engine and increases in volume when the engine accelerates, then the problem is pre-ignition. If the problem is simply pre-ignition, then you will need to check your ignition system, including the knock sensor, crank sensor, and all your spark plugs and coils. This is the simplest thing to do first. Unplug each coil one at a time to verify that the engine loses power for each one. Valve tap can be caused by lifters or a broken valve spring. To diagnose this, you need to remove the valve cover and check the lifters. Are any loose when you try to move them up and down by hand? Engine knock signals that your engine needs to be rebuilt with new piston rods and bearings. It is not a good idea to drive very long with either condition or you could end up causing more damage and get stuck on the side of the road.
SOURCE: my 1990 miata is loosing power when i punch the
Try running some injector cleaner through it , also check to see if there are any air leaks between the throttlebody and the flow meter ( easy way to test is to spray CRC or WD40 at the air pipes while the car is idling, if it revs up while spraying a particular spot, that is where your air leak is.) An air leak between these two parts will let air bypass the flow meter and the engine won't increase the ammount of fuel going to the injectors as you accelerate causing the engine to lean out and hesitate or stall.
SOURCE: loosing power, not taking fuel, sputtering occurs
check the fuel preasure, make sure it has enough fuel preasure, then take a look at the sparkplugs and wires and cap and rotor,
SOURCE: My '95 VX diesal runs rough feels like fuel not getting through,
CHANGING THE FILTER ON FOUR DIESEL WILL only HELP IT-- SOUNDS AS IF YOU HAVE A FUEL SUPPLY OR CONTAMINATION PROBLEM both go through the FILTER so When Changing Filter Try to keep as Full As Possible and Pour into a GLASS Jar let it sit for 10-20 mins. Then you can see the Water (IF ANY) on TOP of the fuel, if you Find Water and Your tank is Low Top Off with DIESEL FUEL this Should Solve your Problem Fuel Filter Must Be REPLACED as Contamints can stow away in it, Bio is Good Both Ecologicly and >>CLEAN will Burn Well > FLUSHING with CLEAN DIESEL FUEL is a good Idea., A VALVE ADJUSTMENT if not performed in a long time or many miles, This can Do Wonders for Your Diesel I hope this helps you with your T L C Have a Good Day and if im Worthy RATE me Accordingly. Thank You, RejakWilson
SOURCE: Loud clanging noise
It sounds like you need a new engine, the connecting rod bearing may have spun and there is to much play now and the oil journals may not be lined up causing the bearing to be starved of oil. Regard less it's going to be an expensive repair since your going to have to tear the whole engine and replace all the warn and damaged parts. Sorry about the bad news.
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