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1

Omega Electrical and Audio Help / Re: Refuses to Start

« on: 23 October 2010, 23:06:12 »

Evenin' all,
New dis pack arrived this morning, installed and delighted to report she started on the button!

Would just like to thank those who offered advice, and to Kevin in particular for his valuable contribution;

I have a feeling the fuel pump will only run when cranking is detected on this system. I don't think it even runs for priming when the ignition is turned on. Kevin

Perhaps I can now get back to living, and maybe concentrate on some of the more mundane niggles with the car.

Lefty

2

Omega Electrical and Audio Help / Re: Refuses to Start

« on: 20 October 2010, 19:55:44 »

Have now verified that my fuel pump relay is only picked when engine is rotating! This must be worth noting for anybody trying to trouble shoot fuel pump problems. As every thing else now apparently eliminated, proceeded with dis pack removal ... that is one nasty job! Found one of the hardest parts was actually pulling off the lower plug leads. Just not enough strength in my poor old fingers to yank them out, so made up a simple tool out of a piece of 5mm thick plastic, cut to approx 5cm/2" square with a "U" shaped cutout on one side. Manouvre it with fingers to slip under the rubber boot of the plug lead and gently lever up. A couple of jiggles (!) and off pops the lead. Slightly reassured to find the pack in a fairly naff state of decay. So new one winging it's way as I type. Fingers crossed that that is the cure, or it could be time for the Great Garage in the Sky for the old girl..

Lefty

3

Omega Electrical and Audio Help / Re: Refuses to Start

« on: 18 October 2010, 18:06:49 »

Thanks for that info Kevin. I've already established that the pump works fine, (a jumper from ECU pin 3 to pin 2, one of the ground pins, will pick the pump relay. (Thank heavens for my Haynes manual schematics)) but realised as I was typing up my post that I hadn't checked if the pump powered up whilst cranking. I'll check it first thing tomorrow. I guess if it does, things start to look gloomy for the dis pack! (and for my knuckles, hands, back, legs, and every thing else...).

Lefty

4

Omega Electrical and Audio Help / Refuses to Start

« on: 18 October 2010, 13:04:16 »

Hi guys, originally posted this problem under "Swapping ECU's", but having investigated further, felt a different title more relevant.
   Problem is my '94 2.5 V6 (119K miles) will not fire up. I had just renewed plugs and cam cover gasket on LH bank, started her up, and after a few moments she cut out and wouldn't restart. No flashing engine light. Codes stored were imob 144 and 145, but I suspect this maybe a red herring as signal from imob/antitheft to pin 27 of ECU is good (+12v). First thing I noticed was the fuel pump does't run. Checked ECU signal (pin 3) that picks pump relay and it's +12v, but should go to 0v to turn on pump ... sounds dodgy I thought. Other observations: when cranking, the engine light doesn't flash but goes out after couple of seconds (looking good), and, using a hand held scope, was able to see that all injectors were firing, camshaft and crankshaft sensors giving convincing outputs, and dis pack primaries appeared to be fired correctly. But using a spare spark plug connected to plug leads on RH bank, no evidence of sparking at all. Ah ha! ... looks like a dead dis pack I'm thinking. Now before I go shredding my hands and temper in replacing it, can anybody explain the fuel pump issue? Does any know if the pump should turn on with ignition, or does it only turn on when engine rotation is sensed? I'd hate to go through the dis pack swap for nothing! Sorry if I've gone on a bit, but this problem is getting to me, so any help will be appreciated.

Cheers,  Lefty

5

Omega Electrical and Audio Help / Re: Swapping ECU's

« on: 18 October 2010, 12:12:41 »

A belated thanks guys for your input on this. Having now investigated a bit further, I'm starting another thread, more appropriately titled  "Refuses to start". Thanks again.

Lefty

6

Omega Electrical and Audio Help / Re: Swapping ECU's

« on: 05 October 2010, 18:16:57 »

Thanks for your advice guys, 'though I confess it's not the news I hoped for. It's rather interesting that there's quite a few ECUs for sale on Ebay being offered without the immobiliser ECU/ring and chip. How do you ever get one of these to work?

7

Omega Electrical and Audio Help / Swapping ECU's

« on: 05 October 2010, 00:58:57 »

Hi there, have been suffering from an intermittent problem on my '94 2.5 saloon; engine either refuses to start, or cuts out and then refuses to restart. It'll crank over fine but won't fire. There's no flashing engine fault light but stored codes are 145 and 144, suggesting immobiliser problem. Now whilst this might be true, the testing I've done so far (armed with the Haynes manual schematics) doesn't convince me, and I'd like to swap out the engine ECU, if only to eliminate it. Can somebody tell me if this is just a "plug and play" exercise or does the ECU have to be matched to the key chip? Does it have to be programmed? Any help would be greatly appreciated, as the intermittent fault is looking kind of permanent right now!                Thanks,    Lefty