A friends 89 Trans Am with a 5.7 (L98) PFI stalls and will crank, but not restart until the car sits for a few minutes. I haven't actually looked at it yet. I'm guessing something is getting heat soaked and cutting out.
I'm aware that fuel injectors when hot can go out of resistance and cause no starts. But do they also cause stalling?
I've ran into a no-start L98 in a Corvette before but it never stalled. I forget the numbers but the injectors ohmed all over the place. I believe that when a injector shorts or is open the engine computer will shutdown the injector driver. The way the wiring diagram shows it there are only 2 injector drivers, one for each bank. In the case of the Corvette it had multiple injector failures on each side.
I also was thinking about a fuel pump relay but I remember that if for some reason the fuel pump relay fails it uses the oil pressure switch circuit to power the pump. I suppose the oil pressure switch could be bad as well.
I'm unsure of the failure rate of ignition coils/control modules on these. Is the Ignition Control Module mounted on the head like a LT1? Or is it built into the distributor?
I haven't gotten any useful information over the phone and plan on looking at it during the weekend.
Turns out the fuel pump, filter and regulator diaphragm were swapped out already. Fuel pressure is at a pretty steady 40psi.
Had good spark and fuel pressure after the stall.
Ohm'd the injectors some were as low as 0.2Ω and some close to spec in the 15.xΩ range. Looks like it's time for 8 new injectors.