non starting ss1 1.8 turbo

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Bing3011
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non starting ss1 1.8 turbo

Post by Bing3011 » Tue Mar 08, 2016 2:58 pm

hi my 1989 ss1 18ti will not start ,getting no injector pulse at all 4 injectors ,changed ecu to one which is known to be good , no codes on it ,good spark at plugs ,3 bar fuel pressure at fuel rail ( have gauge fitted), 12v at one side of injector plugs, all injectors ohmns reading good, wires from ecu to injector checked ok, . any help would be good running out of ideas, ps will run if petrol put down in to inlet manifold, so engine not getting fuel from injectors.



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Re: non starting ss1 1.8 turbo

Post by reliant-reviver » Tue Mar 08, 2016 3:06 pm

When was the car last run?

Not an issue I've had myself, but a number of members have had problems with the distributor optical sensor failing.


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Re: non starting ss1 1.8 turbo

Post by swoakes » Tue Mar 08, 2016 3:09 pm

If it runs with fuel down the inlet like you say it seems like lack of fuel.

If you have 12v at injectors and spark at the plugs then it seems a bit strange.....how long since it ran :?: Seems unlikely that all 4 injectors would be blocked :?

Does it run OK with fuel down the inlet :?:


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Re: non starting ss1 1.8 turbo

Post by philhoward » Tue Mar 08, 2016 3:12 pm

If the crank angle sensor had gone loopy, you'd get sparks in the wrong place (or no sparks at all) but that probably isn't the case if it works with some juice thrown down the inlet.

Could be gummed up injectors - only way I can think of testing them is to pull the injectors and fuel rail out, lay on the top of the engine (connected up) and try and start it - with some tissue to catch the spray, of course.

Try and see if the injectors "click" if you put a 9V battery across the two terminals (the wires on a PP3 battery terminal clip are just about right for this).


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Re: non starting ss1 1.8 turbo

Post by CNHSS1 » Tue Mar 08, 2016 3:13 pm

Remove distributor turn on ignition and spin distrib shaft with distrib plugged in. The injectors should click as they 'fire'. From memory the injectors are batch fired, ie paired up. If checking if they fire with a meter use moving coil not digital.

Report back if the injectors fire.


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Re: non starting ss1 1.8 turbo

Post by philhoward » Tue Mar 08, 2016 3:14 pm

swoakes wrote: Does it run OK with fuel down the inlet :?:
Bing3011 wrote:ps will run if petrol put down in to inlet manifold, so engine not getting fuel from injectors.
I'm assuming it sounds like it's running on all 4 - but they will start (badly) on a couple of working cylinders.


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Re: non starting ss1 1.8 turbo

Post by CNHSS1 » Tue Mar 08, 2016 3:19 pm

As they batch fire, its perfectly possible that only one pair are working, may start and run badly on 2? Also worth looking at wiring to fuel pump as ive had voltage drop due to dodgy loom causing the pump to run very slowly when engine started causing it to fizzle out (not enough pressure to open fuel pressure reg).


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Re: non starting ss1 1.8 turbo

Post by Bing3011 » Tue Mar 08, 2016 5:55 pm

Hi engine was run last week end, not get ting ground pulse to open injectors to let fuel in.runs on all 4 with fuel down manifold,timing right,fuel pump changed for a new one.



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Re: non starting ss1 1.8 turbo

Post by Coupe Racing » Tue Mar 08, 2016 6:56 pm

Broken or corroded engine earth
Not the big one otherwise it wouldn't crank but a small one for the injectors
BMW used to have a common seperate Earth for the injection system


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Re: non starting ss1 1.8 turbo

Post by peter freeman » Tue Mar 08, 2016 7:25 pm

Sounds like you may have lost the common return from the interjects to the ECU.



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Re: non starting ss1 1.8 turbo

Post by philhoward » Tue Mar 08, 2016 7:44 pm

No common return - common feed (I assume that's the 12V observed) and certainly individual returns to Earth through the ECU. I suspect that they may be batch fired though it has a cam angle sensor so could theoretically fire them sequentially.


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Re: non starting ss1 1.8 turbo

Post by peter freeman » Tue Mar 08, 2016 8:11 pm

Never had injector problems so I assumed it was a common return rather than a common feed. I am surprise there is no error indication on the ECU.



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Re: non starting ss1 1.8 turbo

Post by philhoward » Tue Mar 08, 2016 8:13 pm

If it's firing the ignition the ECU has got to be pretty happy? That pretty much says to me the dizzy isn't at fault.


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Re: non starting ss1 1.8 turbo

Post by scimmy ben » Wed Mar 09, 2016 3:55 am

When you say you checked the wiring, did you do a continuity from each injector to the relevant pin on the ECU?

I've had a look at the ECCS wiring diagram and it looks as though all of the earths are common. This *should* mean that if the fuel pump has earth, the injectors have earth but it would be worth cleaning the earth if you are down there.

I'd try verifying the facts - have you tried Craig's suggestion?
CNHSS1 wrote:Remove distributor turn on ignition and spin distrib shaft with distrib plugged in. The injectors should click as they 'fire'. From memory the injectors are batch fired, ie paired up. If checking if they fire with a meter use moving coil not digital.
If they are firing, pull an injector, stuff it into a plastic drinks bottle (labelled as "fuel do not drink" to keep your HSE team happy :D) and turn the engine over to see if fuel is coming out.

If it is, have a look at the pressure regulator and make sure that the fuel pressure gauge is reading accurately.


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Bing3011
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Re: non starting ss1 1.8 turbo

Post by Bing3011 » Wed Mar 09, 2016 9:18 am

hi have checked continuity for each wire from injector to ecu all ok. rigging up extra earth wire from manifold to battery ,made no difference,



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