What will not start, the car, the receiver, or the transmitter? They all have their own switches. I presume it is an electric car and not a gas one, so are all three sets of batteries fully charged? If they are, are all three switches in the "on" position? If nothing happens after everything is go at this point, and the antennas are attached and not blocked by metal objects that are nearby or very close proximity, then I would probably take it back to where I bought it and have one of their experts look at it. I used to work at hobby shops a few decades ago and sold and flew radio control models and owned a few myself, so those are my immediate suggestions. This is presuming that it is only two channel, forward, reverse and throttle in one and the second channel controls steering. If you cannot get anything to work, you could unplug the batteries and use a VOM to make sure you have power from each one. If that is good, then you can dig deeper or make a warranty call or return the unit to the sales point. Most of them will work hard to get a satisfactory result. If it is a Radio Shack or something like that and pretty inexpensive, just take it back.

If its fuel check glow plugs

Its nitro. The TX/RX are fine, it is theactual engine that won't start. Its got brand new LR3 Glow plugs and all batteries are fully charged. It had an electric starter but that motor burn't out.

I do not know how you are trying to start it now, but you can push start it by rolling a drive wheel or drive wheels across the ground or as I did a few times, open the hood on the car and with the engine running, place a drive wheel on a spinning pully or belt, watch out so you do nto get caught on anything and you should be able to spin the wheel and start the motor. You will also need to make sure the glow plug is still good, ( I have had some burn out the first time I put a battery on them), and I presume you have the correct voltage on the battery so you do not burn out the glow plug. Check to make sure you are getting fuel into the carburetor, and then open up the needle valve about 1 1/2 turns, maybe squirt a little fuel down the venturi throat and try it out. If you do not get a bark out of it and it is not trying to fire, and of coarse that glow plug is good, it should all then be issues with the fuel mixture. I hope that helps.