Problem solved... fior the moment
Dear all,
On saturday I studied the electricals of the vehicle, with the repair manual at hand:+24V PERM, +Aft IGN and GND were the main target
I also wanted to check whether the connection was OK between CKP sensor and ECU (changed the sensor, but maybe harness was faulty)
So I performed:
Starting attempt (long) : failed, like the day before
+24V checkings on the engine fuse box (in the battery box)
- all OK, both on Perm+ and +Aft. IGN
GND Checks.
- All OK (from body to Batt, no unusual resistance)
I
disconnected the ECU and checked the GND, all OK. +24V is not easy to check as I didn't have the right probe to check inside the Bosch connector and anyway, most of the +24V feed to ECU are energized by the ECU itself, driving relays inside the battery box. So there's no point checking with the ECU disconnected.
The perfect tool would be a breakout box, were you can check all the lines with ECU connected, but I don't have one, like we had in the workshop back in the days.
I also got a lot of errors from various ECU (airbag etc...) not directly connected to engine function...
Wanted to check the impedance of the CKP sensor on ECU point of view (haness side) but as said previously, I needed cloth pins to access, so I gave up for the moment. So I reconnected the ECU
Some inputs suggested to
check fuel supply. So I did. Recoverd approx. 10 Oz. within a few seconds. (KeyON, key OFF) I was expecting more, but without reference values in hand I had to consider this as OK. Anyway it was far more than the fuel consumption expected in such amount of time. And fuel was ... fuel (colour, odour, cleanliness), nothing to suspect on this side.
So as the battery was on the low side, I decided to try a last starting attempt until it run dry, as I was about to charge the battery anyway
THIS ****ING THING STARTED ON THE FIRST COMPRESSION....with ultra weak battery Perfect idle. No hesitation, no vibration, no smoke. Business as usual...
So now I 'm in between Satisfaction (been sitting for too long...:bang: ) and frustration: I positively CANNOT explain why it started as I didn't performed any repair since the day before, only checkings.
Until now (cross fingers) it starts perfectly every time... but as we were not able to identify the root cause, maybe it'll comme back sooner or later. Who knows ?
So for now, Stilo is still inder survey.
Best regards
Sebastien