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I think the 164E used D-jet to the end of production.
It is a little hard for the computer to mistakenly tell the injectors to stay open too long on a cold start - if it was running rich after it warmed up the coolant sensor would be a goo place to check. But going rich during crankinig sounds like something a it more mechanical.
The checks I would do to look for likely suspects:
1) Leaking injectors - D-jet injectors that haven't been used much lately will often get sticky. Usually they stick shut, but they can also stick open. unfasten all 6 little sheet metal holders that hold the injectors to their mounts, give each one a little twist to break the stiction, and gently pull the entire fuel rail up with all oses and wires still attached. You should ave just enough slack to barely pull the ends of the injectors past their sockets. Then pull off one of the low tention (12V) wires on the coil (so it doesn't overheat while you fiddle with the injectors), turn on the key several times (to ensure pressure - don't crank), and leave the key on. Go up by the injectors and look for any gas coming out - there shouldn't be any. If you open the throttle the injectors should fire (I think in two groups of 3) - look for any that don't spray or have noticable weaker sprays.
2) Fuel pressure - a stuck, plugged, inop pressure regulator can let the pressure deviate from the prescribed 28 to 32 psi range (I've seen various figures, you can use the pressure to fine tune). Running rich could be the result of high fuel pressure. Unhook the hose from the cold start valve and attach a pressure gauge. Turn the key on several times and see what it does. Should hit 29 - 32 and stay steady.
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I'm JohnMc, and I approved this message.
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