Is there any way to tell what the check engine light is referring to when it is on without having to hook a computer to the truck?
(YES) & it would b really easy if there was a year & model :->
Can you put a 3.5L Nissan maxima engine in a 2003 Nissan sentra without having to spend a ton of money to change everything?
If it has an electronic engine, there'll be an SAE J1939 port on the bottom of the dash on the driver's side.. depending on what engine you have, you get a computer with the appropriate software for that engine (E.G., Insite for Cummins, Davie for PACCAR, etc.) and a compatible connection unit (e.g., Inline for Cummins, NexIQ, etc.) and you pull codes that way. You can view codes without having the ECM password.
How do you bypass the computer in a 91 Chevy Blazer to wire in an 82 6.2 liter engine without having to do too much to the existing wiring?
This question must have been asked by and autistic five year old but I will answer it anyway. A computer mouse allows you to use a computer. Without a computer mouse you cannot operate a computer. That is like asking what are the pros and cons for having 4 tires on your car. Without them your car will not operate. Simple as that.