longer than normal crank time

[scottinAZ]

I have just over 10K on my swap (94 M50TU into 87 cabbie) and am now getting an intermittent issue with cranking times.

Normally it will start almost immediately, however on occasion it will take up to about 5 seconds (or a bit more) for the engine to fire.

what would cause that to start now? leaky injector? Bad Relay, FPR taking a shit?

want to nip this in the bud before it becomes a more annoying issue

[Adrian_Visser]

There is a check valve on the outlet of the fuel pump that can sometimes quit and cause longer than normal cranking times, I don't know if it would cause a five second crank though.

[JTapper]

Sounds like a crank position sensor failure. I'd test it for resistance.

[328ijunkie]

Relays.

[scottinAZ]

Relays.

changed, and seems to be working.....

Fuckin 20 yr old relays....

[ak-]

Fpr was the fix for me.

[MaxBell]

I had that in my M20 and the fuel pump was the problem.