Electrical: 3b not starting.

[WidowmakerS2]

According to a guy at another forum, these are what's keeping my fuel pump from priming/running:



The red/white wire in the background is a loose one without a connector.

Checked B-plug. All wires in the right places.

[S2central.net]

Observe Track #14 - pin 3 from ECU is what activates the fuel pump relay... It needs to a specific type of relay here - not like on KV or 7A engine for example.

ECU pulls that pin to 0V so that the relay energises... then (and only then) should you get 12V at 87a, O and H87F terminals

[WidowmakerS2]

So.. I need a new relay?

Aha..

[S2central.net]

part number for S2/RS2 FPR is 8A0 951 253 B

You can just jumper the contacts temporarily if you wish to run the pump so as to crank the engine into life and prove that all other wiring is OK.

[WidowmakerS2]

Okay, we have starter power
Turned out the whole F-connector was loose.:mischeif:

Although I can't hear the fuel pump, there's def fuel in the system when I crank it.
I had a small leak in one of the hoses and a much bigger one near det filter.

Still won't fire up though..

[WidowmakerS2]

Update:

-Fuel to fuel rail
-Starter runs. Engine turns over nicely
-Plugs are dry(injectors not opening)
-No spark

Reasons?:

-Timing?
-CPS?
-Earth cable from engine mounting to chassis is not there Starter is running fine though.

[S2central.net]

Make sure all the earths are good...

no signal from rpm sensor ==> no fuel pump activation - did you fit an S2/RS2 fuel pump yet - it has an extra pin for ECU control

[WidowmakerS2]

Could be just an earth problem then.

I was just out and checked connectors. The dizzy connector was only barely in place, probably moved it when I fiddled with the breather hoses.

With the dizzy connector in place, I think I have spark.
Took a short vid for you to evaluate.

Start up attempt #325

[WidowmakerS2]

There's def fuel in the engine! Took out all the plugs today, and they were all wet. Dried them off and tried again, but still it only fires on one or two cylinders about every 10 secs.

[newsh]

Try reversing the wires to the hall sender? When I rebuilt my ur it would only fire weakly once every few seconds, the wire colours to the hall sender were wrong. Took a while to find that

[newsh]

Mmm, just watched the vid, its deff trying to start ..

Can you pull codes? Vagcom or blinks?

Is the MAF connected ok? Known to be good?

[newsh]

Check your dizzy static timing very carefully, it has to be exactly on the marks, with the engine rotated forwards onto them.

[WidowmakerS2]

I'll pull codes first thing tomm. Timing is 2nd.

MAF is connected and known to be good.

[WidowmakerS2]

No luck pulling codes.
Timing was off a bit at the bottom, and the 13mm nut holding the dizzy in place was loose (sure i tightened it before though).

IT'S ALIVE!!

[S2central.net]

Result ... It's usually something fundamental with these 'no start' threads