1446 replies to this topic

[GreaseMonkey]

Sounds daft but spark plugs or leads? Can the standard ECU be mapped?

[mk3 Cooper S]

If you have changed the lambda sensor for the non heated (3 wire type) your sensor could be not within accurate operating temp during prolonged idle and therefore going to fully rich and smoking after prolonged idle. I.E not closed loop fueling.

I presume ther is no cat either (which tends to retain the heat when it has lit off and retaining the temp in the lambda sensor) ?

[The Matt]

Hmmm, maybe, but Vauxhall no longer do the three wire lambda sensor for it. I'm not sure what you mean about the heat in the cat, but yeah, there's no cat on it.

[mk3 Cooper S]

Hmmm, maybe, but Vauxhall no longer do the three wire lambda sensor for it. I'm not sure what you mean about the heat in the cat, but yeah, there's no cat on it.

Yep probably a cost down as the heater ones are more expensive.(and the more efficient cat light off strategies etc)

The lambda sensor and Cat rely on certain operating temps to work correctly. The Cat brick holds a lot of heat once it has lit off (up to efficient temp) and generally the sensors are close to the cat (pre and or post).
I was wondering if the position of the sensor and lack of cat brick(heat source) could cause the lambda sensor to require the 3 wire heating element for your car?

Edited by mk3 Cooper S, 20 August 2010 - 10:48 PM.

[The Matt]

Aaaah, I see. It's worth a try, if I can find one.

[mini93]

not going to be something stupid like a temperature sensor is it? especialy if it has a feed into the ECU... bit of a wild guess

[GreaseMonkey]

Can you only use OEM Lambda? I'm pretty sure the Bosch Lambda that comes with the Innovate and AEM gauges Pre heat themselves?

[The Matt]

My head is now fried!

All wiring and connectors checked again. Every sensor checked for function, all OK.

Still over fuels.

I've moved the lambda now, so it's right in the manifold, before it was in the down pipe. No difference.

So, last resort today is to try a different fuel pump. It's the only thing left to try.

I think I've been stupid though. I did an eBay search for Corsa GSi fuel pump and found a Walbro uprated one, which (now I look back) was an uprated universal one, not a Corsa GSi specific one. Perhaps it's just pumping too much fuel for the standard regulator to cope with? I'd never even thought of it until yesterday when I was double checking that my return line was pumping fuel back to the tank.

Could it be that? It must be, I've tried everything else. If it ain't that, I will have to give up as I'm totally out of ideas, money and time.

Which route should I go down? Go to the scrappy and get the fuel pump off the 1.4 16V Corsa they had there, or look for a Mini MPi one?

[The Matt]

Actually, looking at the type of fuel pump I've got, it's definitely total over kill. There are people running 500bhp turbo motors with the same pump

255L/hour is waaaaay too much, and it's a high pressure one. Standard X14XE one shall be fitted today.

Keep yer fingers crossed!

[Purple Tom]

Hope you get it sorted Matt, I remember well the days of getting my conversion ready for the second BH2N, it's certainly stressful!

When you get the fuel pump it'll probably be encased in lots of plastic, as that's how they're mounted in the standard tank. Just remove all of that rubbish and you should find a slimline pump which'll fit in the SPi/MPi tank without any problems at all.

Good luck!

[alexcrosse]

if youve put a gauge on it and the pressures ok i cant see you uprated pump being the problem although for your sake i hope it is!

have you tried bolting a standard inlet on?

[The Matt]

Pump swapped. No joy. In fact, whatever the fault was is now ten times worse.

It's undrivable now. Missing, popping, cutting out, won't rev at all.

It's definitely electrical. But I don't have a clue now. I've tried everything, absolutely everything.

[Kam]

Your still using the standard ecu aint you? Any error codes?

Could try a cry for help over on 16v? Give them a rundown?

Hope you get some luck mate

[lemmingzappa]

Hope you get it sorted for Germany

[Purple Tom]

Have you tried the coolant temperature sensor? I know you said you've checked them all but as it's a problem that gets worse as the engine warms up then I'd say it has to be something like that, or the lambda...

Have you checked to make sure the engine earths are all ok? Especially those anywhere near where things get hot? I had an intermittent electrical fault when I did an OBD2 conversion on my VR6 which turned out to be an engine earth near the gearbox which only gave trouble when everything warmed up....

Hope you get it sorted!