In my Toyota previa 93 , it gives knocking sound when in gear and it become more if AC is ON and if i put it in neutral this sounds goes off Pls any one knows the reason

SOURCE: 1992 toyota previa makes sputtering sound when i

prolly sad shaft bushings 100 bucks on eBay and not to much expertise needed

SOURCE: toyota previa 1993 startup problems

Does it spin at all? If not either the starter is bad or the engine is seized. Try to turn engine with a socket wrench on the crank pulley bolt. Anything happen to the truck just before you had starting problems (drive through a deep puddle, overheat the engine, lose oil pressure, blown head gasket)? If it was deep water the engine could have hydraulic lock from water in the cylinder(s), remove the spark plugs and try to turn it over with the starter. If it turns over clean, dry and re-install the plugs. If it overheated, ran with low oil pressure, or the oil was contaminated with coolant the engine is probably seized.

SOURCE: Very dificult to start

I would change fuel filter any way only £6 delivered on ebay then i would start looking at glow plugs and relays first check to make sure glow plugs are getting a live feed bad side glow plugs are located under drivers seat side of engine so not easy to get at unless you remove seat carpet and engine covers

SOURCE: Removing a speedo gear from 86 toyota transfer case

do you mean the actual gear for the speedometer? if so no they don't, but of course the cable must be disconnected

SOURCE: 91 Toyota Previa AWD - Swap original engine for Previa Supercharged engine

I do a lot of work on Toyota Previa before; including rebuilt engine, swapping engine and transmission and lot of things in between, but never swap a normal aspirated engine to a supercharged engine or diesel. Since i have some experience in Previa, I would like to share my opinion with you regarding your plan to swapping the normal aspirated Previa engine to a Supercharged engine. When you do a swapp like that, you will not only be dealing with just swapping engine, but some wiring, computer, throttle body, air cleaner assembly, extra frame and pulley on the accessory items, transmission as well as a right rear end to get the correct gear ratio to accomodate the new engine and transmission. I can go on even more, but let me tell you this, beside less headache, it would definitely cheaper if you were to find a Supercharged Previa and fix it up. However, if you are totally motivated to do this project, keep in mind, this engine swap will be a long term and time consuming project.l I wish you best of luck and have fun!