Thought I would add to this old thread instead of starting a new one on the same thing....
I'm just going through some of the startup procedures mentioned here and in other similar threads before starting my engine for the first time in maybe 5 years, since removing the fuel tank for front end panel replacement.... 1973 2.4T USA engine and MFI was set up and running good before this...
So, who things this old bugger will start on one battery charge?
So far, I have:
- cleaned out the new tank as per manuf instructions + cleaned the fuel outlet gauze.
- pulled the plugs (all black and wet, and one had a bad gap but maybe it was boinked on the way out)
- engine turned freely by hand
- bore-scoped the pistons through the spark holes (out of curiosity since I was using the camera anyway, and through paranoia because I once found some pieces of a plastic intake inside on another engine) - all look good. Found a copper plug washer and the rubber insert from inside of my 21mm spark plug socket down the plug holes- wondered where that rubber insert had gone and why one plug just kept turning and turning!!
- did the Biro test on the MFI pump - rack moved freely and returned great
Next steps are:
- disconnect the MFI inj. pump fuel feed and place the hose in a clean glass bottle
- put 5 litres of 99 RON gas in the new tank, operate the fuel pump and dump gas into the bottle (hopefully!)
- reconnect the inj. pump fuel feed and put the fuel back in the tank, operate the pump again to prime/fill the pump with gas.
HAVING TROUBLE with 2 things at the moment:
I want to pull the 3-pin CDI connector before cranking for the first couple of times to build oil pressure (hopefully!)...
- however, the connector will not budge -
is there an alternative way to disable the spark, without removing the 3-pin connector? e.g. removing the ground terminal or the coil HT lead? BTW. many thanks to the Porsche engineer that decided to put one of the bolts for the CDI panel right behind the 3-pin connector!!
I want to fill the MFI pump with oil... it appears that the traditional way to do this is to fill it through the oil return that connects to the breather. However, the rubber hose section (see attached pic) doesn't want to budge either, but I am thinking of 'cutting' it off and replacing it with new hose.
-
has anyone tried to get a new joining hose section on with the pump and breather in place? I am a bit worried that its going to be a royal PITA and cutting the old one up ight be a mistake.
Following on from that, I am taking some advice from Grady Clay et. al's suggestions in this post and this other one primarily:
http://forums.pelicanparts.com/porsche-911-technical-forum/246015-motor-break-mfi.html
- I noticed some differences, or alternative procedures, in Grady's suggestions for enabling/disabling CDI and fuel pump. I am going with fuel pump off and CDI off for initial cranking but then fuel pump on with injection pipes cracked to release air:
Does the following procedure look good to you guys that know this stuff?
- crank the engine and check for oil pressure build up with fuel pump off (but injection pump primed with fuel first) and CDI off (or alternative way to turn off the sparks).
- loosen the injector connections at the injectors, one at a time to the expel air (faster) and crank again with fuel pump on. I'll be soaking up the fuel with paper towels or funnelling it into a jar if possible...
- reconnect everything and try to start the engine.
I'll keep you posted - any suggestions or advice warmly welcomed
