2 days to get it firing! HELP!!

[Johnny_E]

Well, my project GTII has been started regularly since I got it a few months back - probably once a fortnight. I keep it on an Optimate battery maintainer, so I know that the battery is in tip top form.

The car goes to the body shop soon to get the crash damage sorted out - so yesterday I thought I'd do some more sprucing up. I used a few caps of Gunk to de-grease the dirty engine bay and rinsed it off with a hose. I took care to keep alternator etc dry. At this point its worth saying that theres a MOSS MS715 alarm/immobiliser on the car - the type that uses a fob to deactivate it in the dash.

So... after the rinse.. I held up the fob to the sensor in the dash - ignition on (no immobiliser light to say that its still immobilised) and turn the key.. NOTHING. Absolutely nothing. No solenoid click, no dimming of lights, nothing.

This is the immobiliser at fault here isn't it? I've had a look at the control module in the wiper area of the engine bay - and all 3 main fuses on the immobiliser seem to be intact.

Any ideas?

[Nate]

check the trigger wire is connected to the starter and that it is switching when you turn the key.

[Johnny_E]

Well, this wee Rocco has had a few lazy sh**es working on it over the past years

I spent an hour there troubleshooting the Moss MS715 alarm on the car - to then realise that it was fully wired EXCEPT for the positive supply lead. Somebody had fitted ANOTHER immobiliser - and left the Moss in place. There must've been 20+ wires criss crossing all over the engine bay, simply doing nothing! Lazy gits. Anyway - its been hauled out and the engine bay looks much better for it.

So - the current (faulty) immobiliser was a Meta Security M36T touch key immobiliser. Its given up, so I've started removing it. Its all done at the fuse box luckily. It was easy to see that the main +ve starter power was interrupted, and one other black wire was interrupted. I reconnected these 2 and am glad to say that the car now cranks! Brilliant.

Well, not - cos it wont fire.

Theres only one wire left that I have to remove and that is tapped off a +ve switched supply. No big deal there.

So, I'm stumped. The immobilliser is disconnected. No more to remove, yet theres no spark. The car cranks on the starter 100% but it refuses to fire.

Now the only thing I've noticed is that theres 2 OE wires from the loom that are NOT connected. They're hanging to the right of the fuse box.

1 x Grey/Yellow (male spade connector)
1 x Green/Black (female connector)



Are these a red herring? Nothing to do with the problem? Maybe its just a simple fuse that powers the coil? I've no manual and the fuse list is in German. In saying that, I pulled them all and they look OK.

HELP! The car is booked into the bodyshop for next week and if I cant get her running, I'll have to call it off. Any help at all very much appreciated.

[Johnny_E]

When I used to turn on the ignition, I heard a 'whirring' noise for a few secs. Now the car is on a Weber, so was this an electrical fuel pump priming? If it was, then I no longer have this noise. On turning on the ignition - its silent.

OK - just been out - Definitely the fuel pump. Theres a clear Fram inline fuel filter in the car before the carb and its go no juice in it! No fuel. I did notice when I first got the immobiliser removed that the car made 1 splutter on inital cranking - so I am now assuming that the coil is OK. I'm stumped There were only 2 wires interrupted by the immobiliser and I've reconnected them both.

Reading this thread http://www.sciroccoregisterforum.co.uk/ ... wer#p18257 - theres talk about a black/green wire supplying the fuel pump. Maybe I pulled this off its pin when I dropped the fuse box down? Its supposed to go to pin A8. How do I know where A8 is?

EDIT: Or am I a complete numpty - and this car has a mechanical fuel pump? The Haynes says so - so what was that priming noise that's now disappeared?

[Funky Diver]

If memory serves there's 2 pumps.

One primes the fuel line from the tank (so it's under pressure), the other lifts it into the swirl pot relative to the engine speed.

[Johnny_E]

I'll start with the end of the story - its working

The cause? Frig knows. There was power to the coil. There was spark at the plugs. There was fuel visible in the clear filter (once I had a second pair of eyes to check whilst cranking).

My mate was over - looked at the Weber, pumped it by hand a few times and on the next crank... result

No idea what that was. Dont care - its working now, the panels were dropped off to the bodyshop, and the car follows next week. Happy days !

[Nate]

If memory serves there's 2 pumps.

One primes the fuel line from the tank (so it's under pressure), the other lifts it into the swirl pot relative to the engine speed.

carbs only have the mechanical pump

[Funky Diver]

aaaaaah, oooooooh, aaaaaaaaah

[Nate]