Rek
Well-Known Member
I decided to replace the manifold to idle control valve hose in a search for an air leak affecting my engine. I also thought that I could replace the injector O rings too.
The injectors had to be prised out with a screwdriver and were in a real state with broken bits. There did not seem much trace of the plastic ends of the injectors in the manifold. One seemed jammed open, another wasn't in fully and all the lower O rings were hard.
The history behind the engine was that it was from a B10 Alpina which had done 300,000 miles. The engine had been rebuilt (at a cost of £12,000 as per the invoive) at 225,000 miles. They had obviously not touched the injectors.
Because the injectors had fractured, I took the manifold off, finding that the lower bolts were only hand tight at best. There was evidence of leaking fuel on the lower connecting face of the manifold.
New/remanufactured injectors on order.
I have a question though. Under the manifold are two small pipes which allow air into the manifold. Nothing was connected to them but suspect they might be something to do with the evap valve from the fuel tank or carbon canister on the original donor car. I did not fit the engine myself.
These are marked in red on the attached photograph (not my manifold - mine does not have the evap valve).
Can I just block these off to retain the vacuum? Anyone know what they were for? Perhaps I am missing some vacuum lines.
The injectors had to be prised out with a screwdriver and were in a real state with broken bits. There did not seem much trace of the plastic ends of the injectors in the manifold. One seemed jammed open, another wasn't in fully and all the lower O rings were hard.
The history behind the engine was that it was from a B10 Alpina which had done 300,000 miles. The engine had been rebuilt (at a cost of £12,000 as per the invoive) at 225,000 miles. They had obviously not touched the injectors.
Because the injectors had fractured, I took the manifold off, finding that the lower bolts were only hand tight at best. There was evidence of leaking fuel on the lower connecting face of the manifold.
New/remanufactured injectors on order.
I have a question though. Under the manifold are two small pipes which allow air into the manifold. Nothing was connected to them but suspect they might be something to do with the evap valve from the fuel tank or carbon canister on the original donor car. I did not fit the engine myself.
These are marked in red on the attached photograph (not my manifold - mine does not have the evap valve).
Can I just block these off to retain the vacuum? Anyone know what they were for? Perhaps I am missing some vacuum lines.