Connect a meter to the H-bride inputs to see if you are driving them properly. If not, fix your code.
"Scrap ride on jeep"? L293?
It sounds like the OP is (somehow) expecting to be able to control a....
You know - before I shoot my mouth off much - maybe the OP can give us some details:
1. What kind of "scrap ride on jeep" is this thing?
2. What are the specs of the motors involved?
3. Maybe some pics, some schematics, maybe some code - something?
I mean - for all I know the OP is trying to drive a large 5 amp gear motor using his L293; that ain't gonna work well...