i recently bought a 92 z28 with a 305 and 700r4. the car runs great once it starts. but it take anywhere from 15-30 seconds of cranking before it will start.
the car is completely stock. Any ideas ?

 

bump

 

Id say fuel pump. Before mine totally died on me it did the same thing, progressively getting worse.

 

Actually, as soon as this post went up, I started having the same problem. For instance, as soon as I turn the key on - but before starting - I wait until I hear my electric pump finish its whining prime. Then, I start it. However, if I shut it off and try to start it again within a half hour, it will just crank and I have to go old school (pumping gas pedal) to get it to start. Is this the problem both of you have/had?

 

well mine i will turn the key to on wait for fuel pump and i cycle the key that way 3 or 4 time and it still cranks for about 30 seconds, it seem like once the engine builds oil pressure then it will start right up, i can then shut it off and it will start it right up again.

 

I'm look at replacing the fuel pump relay - helluva lot easier than the fuel pump, and cheap to try $10).

The oil pressure swending unit will kick in the fuel pump IF the relay is not working, but it takes a few seconds to register the oil pressure. Sounds like exactly what's happening.

Normally, the fuel pump primes (a programmed function of the ECM when key turned on), and then, when car staretd, the ECM will run the fuel pump as soon as it "sees" a steady ignition (distributor).

So, it's also possible (I suppose) that something might be wrong with your ESC, or distributor, or ECM as well. But I'd try a new relay first.

 

where abouts is that relay located ?

 

On my TBI car, it was on firewall, driver side, inside a bracket between the fender and the brake booster - there were two relays there, one for fuel pump, one for electric fan. But exact location on a TPI car I'm unsure.