Injector questions

i own a 1973 914 2.0 porsche in which it is in the mechanic shop for installing new 4 injectors.is it best to take one from /injector/ car and match it up with a new one .are there model or part numbers on each injector,so we get the right injector,what should the psi fuel/oil be set or read..we have seen 2.0 bar and 1.5 bar.what is layman terms.is there any thing else that should be done while changing out injectors...please advise..

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This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: EFI Troubleshooting Document #1

[Nick at Pelican Parts]

It is best to replace them in sets and from the same application.
1.5 bar = 21.7 PSI, 2 bar = 29 PSI. Not 100% sure but you might be able to find a Bosch or the vendor part# on the old injectors.

- Nick

[Dave at Pelican Parts]

For a 2.0 liter 914, the stock fuel system is the D-jetronic system. Its primary measure of load is the Manifold Pressure Sensor (MPS), a silver hand-grenade looking thing over on the right side of the engine bay; it has a four-wire electrical plug and one vacuum hose going to it.

The correct injectors for that would be Porsche part number 039-906-031A , or Bosch part number 0-280-150-038 . Those seem to be NLA at the moment, though. (Link in the catalog)

These injectors have green plastic parts, which differentiates them from the 1.7 injectors (yellow or sometimes black) or the 1.8 injectors (light blue or rarely purple).

The correct fuel pressure for the D-jetronic system (used in the 1.7 liter and 2.0 liter 914s) is 2.0 bar, or 29 PSI.

--DD

[TheCabinetmaker]

Besure to ask to be able to keep your old injectors, all four may not be dead. If they are clogged, a cleaning service company might be able to get them running like new again. (Whitchhunter is a company that does this service, flow tests them too). If however they leak gasoline around cracks in the body, or at the plastic to metal body joint, they are not currently savagable that i know of.

good to have a spare handy. Save the old ones.