S2 ABY Wont start

[Jonnybravo]

I do on a Avant but not a coupe, I'm sure they were easily accesible on a coupe where as the Avant ones are rather awkward to change. Someone on here will know for sure !

[newsh]

If its a coupe the fuel filter is under the floor near the battery.

[newsh]

If the fuel pump is sometimes running and sometimes not then I suspect either the relay or the alarm/immobiliser. On Keith's coupe the connector to the immob was burnt on the pins that carried the current for the pump.

[Biggss2]

You say that James, however I think the pump may well have been working overtime! I heard it buzzing all the 20miles I drove it! If you can send it me I'd appreciate it greatly..

With regards to the other 2 relays I've kept them safe ..

Text me your address on my number when you get a minute please mate

Thanks

[Biggss2]

Should the fuel pump spin everytime the ignition is on?

Ive got the pump where it's in the fuel and is clearly visible..

I'm going to check/change the fuel filter tomorrow..

With regards to the immobilizer, well il be damned if it's that the amount of wires etc I wouldn't know where to start the fact that it's an aftermarket laserline one doesn't help the situation

Thanks newsh.. You have been a great help buddy

[newsh]

If the Immob has a big multipin connector give that a wiggle and see if it starts

[Biggss2]

Will do newsh mate

I drove it 20miles though before it died again.. So would it be immObilser related?

I'm 99% sure it's fuel related it drove hesitantly and stuck in traffic suddenly it died

To say it's confusing would be an understatement!

[newsh]

The power feed to the fuel pump or to the relay which feeds it, runs through the immob, if the wiring is poor or the big multipin connector overheats then the fuel pump supply can get interrupted. It then cools down and works again for a while. I'm not certain of course but I've seen it and its possible. Ideally you need to get a meter on the fuel pump wire and see if the pump is getting power, it should get power while the engine is cranking. If you can manually close the contacts on the FP relay and voltage appears at the pump but the pump does not run then the pump is dead or the wiring at the pump body has a fault. The fuel pump should run if the ignition is on and you manually close the fuel pump relay.

[Biggss2]

Hmmm that makes sense newsh mate

With The FP relay bypassed pump runs

I'm going to check the wiring from immob to FP how I'm going to locate this wire is beyond me

The car this morning still wouldn't start from cool!

When I changed the FP initially it fired up like a treat..

The nuts on the last FP were corroded when changed but the wiring itself didn't look too clever either and when we changed the pump we made a point of making sure the wires were nice and tight at the nuts and secure around the top of the pump.. maybe a little too secure?!

I'm really hoping the filter cures it.. An overly optimistic approach I'm sure you will agree

[newsh]

Well, another test to do would be to crack the fuel line at the rail and put it in a bottle and crank the engine, you should get a load of fuel out, same if you bypass the relay, quantity of fuel over time for this test are on here if you search.

Immob, down by the ECU they will most likely have opened up the loom and cut the green wire for the fuel pump and soldered in 2 black ones, easy to bypass.

You have to hate an intermittant fault..

[Biggss2]

Right ok, the plot thickens

I went back to basics, checked spark.. Nothing now I have no fuel and no spark coil packs look cooked.. I've got some replacements today..

The fuel relay doesn't click.. When bypassed it sends fuel.. The fuel regulator/return I have also replaced..

Has my crank position sensor packed up?

I have got the lower crank g40? (it's got 2 plugs and bars on it about 2 inches long) sensor I'm going to replace hopefully tomorrow..

Can anyone shed any light?

To start off with there was spark and no fuel, fuel pump changed car ran and now it hasnt got either spark nor fuel

Thanks
Thanks..

[Biggss2]

Hi all,

I'm really starting to lose faith with this now, new coilpack, new hall sensor (£150 from Audi- ouch) new g40 sensors, different ecu (thanks James- havnt forgot about you) still no spark!

Is there Anyone near or in the west midlands area mechanically minded that can help me out on this one?

It would bring a tear to break her..

Thanks

[newsh]

Have you inspected that big multiway connector on the immobiliser yet?

[Biggss2]

Newsh I have mate it doesn't look burnt or anything it's got s couple of wires coming out of it connected to 2 5amp fuses both of which are okay too?!

Where would I start with disconnecting it altogether?

[Biturbo]

Hi all,

I'm really starting to lose faith with this now, new coilpack, new hall sensor (£150 from Audi- ouch) new g40 sensors, different ecu (thanks James- havnt forgot about you) still no spark!

Is there Anyone near or in the west midlands area mechanically minded that can help me out on this one?

It would bring a tear to break her..

Thanks

Hi,I live in Kettering.I have all diagnostic tolls needed can help you with that.And I have immo cable if that immo problem.Pm me if you wont me help.