2 pin engine harness connector

Post Sat Dec 07, 2019 4:55 pm

Got a little bit of a silly question. Just rebuilding an '88 325i that has been sitting with no engine in for over 10 years. Engines now in, pretty much ready to go, just waiting on a few last bits. Have just been plugging in the engine harness and have one female 2 pin connector and I can't work out where its supposed to go. It comes out of the harness with the ICV and TPS plugs. Anyone got any idea?

Post Sat Dec 07, 2019 5:39 pm

This one comes up on here several times a year. It's the plug for a solenoid valve in the vacuum line to a carbon canister, both of which you don't have fitted.

Post Sat Dec 07, 2019 5:46 pm

Thanks man, appreciate it.

Post Sat Dec 07, 2019 6:46 pm

As well as the unused electrical plug, you also have the unused vacuum connections. One is a rubber hose connected to a steel pipe in the lower back left of the engine compartment, and the end of this hose must be left open, otherwise your 55 litre fuel tank will become a 35 litre tank. The other connection is a small stub pipe, under the throttle body,almost touching the throttle position switch, and this must be blocked off for the engine to idle properly. It should be fitted with a small rubber cap, but this often deteriorates with age and falls off.