[pbanders]

If your car is cranking, the warm/hot start problem you describe is not related to the starter or any booster relay circuit. Hot start over/under-enrichment is a problem with many 914 D-Jet cars. The root cause can either be the ECU hot start circuit (poorly designed on the 015 and 037 ECU's), or it can be related to fuel rail pressurization problems.

Try two different things the next time it happens. First, try turning the key on, then off 5 times. This will enable the fuel pump to run for a total of about 8 seconds, which should pressurize the fuel rail and fill it. If that has no effect, try starting the car this way - with the key off, depress the throttle to the floor and hold it. Now turn the key to the cranking position and hold it there until it starts. Sometimes, a leaky injector will deposit a great deal of fuel in the intake, causing the car to be over-rich during starting (or the ECI problem I mentioned will over-enrich a warm motor on starting). Holding the throttle open will provide more air and will compensate for the overly rich mixture. The reason you open the throttle before turning the key is that if the key is on when you open the throttle, you will squirt ten 1 ms pulses of fuel into one injector bank, due to the action of the accelerator circuit of the TPS, making the mixture even richer.