97 camry delay start when turning the key

Check, tighten and clean all battery connections. Also do the negative connections on frame and motor.

the battery has to be newer than five or you'll start havin; alternator problems as the battery refuses to accept a charge 10% per/yr...so yours is a "gonzo"...get a new one and do as dandyoun suggests...some have two 1/0 cables one for the motorblock and one for the chassis (where the ECM resides)~

quite surprised the starter solenoid can engage on a reduced amperage/potential~ a testament to superior design...as I recall the ground connection is UNDERNEATH that battery so tho inconvenient, undo that lug and wirebrush it clean~

delay start meaning? a pause in the current energizing starter or while cranking a delay in lighting it up? ignition switch sending under full 12 volts .meter the battery! or needs plugs and strong fuel pressure! respectively