On another cold rainy lockdown day, decided to run some basic tests to see if the work I've done so far is OK.
1) Vacuum test - unable to detect any leaks (will talk more about my homemade smoke machine later if I feel like it!)
2) Removed airbox, restart - no good
3) Removed airbox, removed drive belt, no good
4) Replaced everything except MAF, no good
5) Replaced everything and bypassed fuel pump relay with jumper wire - no good
6) Swapped MAF for a dodgy cheap yum cha china MAF bought from aliexpress - no good. Put back the Bosch unit
7) Swapped in two spare car batteries from my other cars - no good.
Then thought I might as well check the new fuel pump.
Porsche workshop manual specifies 850ml in 30 seconds output - this is well short!
Engine off, powered fuel pump on - only 2.2bar of pressure instead of the 3.8 it should have!
SO, is it a bad new fuel pump, or is there something else? Now need to check
- Check fuel filter - just ordered a replacement part, only $35 delivered for a Mahle filter, but won't arrive for a week. Change it out, then recheck pressure and flow. Try starting car.
- If still no good, check for low voltage to fuel pump (should be at least close to 12V). Perhaps a bad ground, loose connection, or bad wiring. Or maybe the voltage is fine.
- Obstructed fuel lines - visually check as much as possible for any crimps, bends, folds etc that would obstruct flow.
Making progress? Wouldn't call it that, but need to get this fixed anyway. What a saga.
No comments:
Post a Comment