Engine running rich

jacksie66

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rex-x

You have a vacuum leak. Fuel trim rich shows its adding fuel to match the air thats leaking in unmetered and id bet you didn't need any other the bits you replaced, they wont affect fuel trim like that.

jacksie66

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rex-x

Well we use a pressurised smoke tester, makes it easy but i'm guessing you wont have one.... spraying carb cleaner around suspect areas and listening for a change in engine note can be useful but your eyes will be your best tool They can be hard to find..... Also I know the code is misleading but your car is actually running lean not rich, the fuel trim code means its maxxed out adding fuel to compensate for the lean condition

jacksie66

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Gravelly

jacksie66 wrote: »

Cheers. Definitely needed the post cat lambda and the coil pack. What'd be the best way to check for a vacuum leak? Spray the engine with soapy water?

Do a visual check of the hoses first because that's the most likely place you'll find it, and they can be checked easily enough.

rex-x

jacksie66 wrote: »

Cheers for that. Appreciate it. So would the vacuum leak cause the very rough start up? When the key is turned first thing it revs and splutters and nearly cuts out. Then runs fine after a few minutes.

Yes vacuum leaks wreak havoc with idle and cold starts

jacksie66

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Cerebrum

jacksie66 wrote: »

Another quick question. If it was a vacuum leak would the rough start be there the while time and not just when it's cold?

Engine runs rich intentionally when cold.

On the 18XE, there's a well known issue of exhaust manifolds leaking, in particular, the left side as you look at the engine.
Check under the heat shield also for cracks. It's likely to be tiny, but enough to suck in enough oxygen to fool the Bank1 lambda.

Guide here;

http://www.vauxhallownersnetwork.co.uk/index.php?threads/blowing-exhaust-manifold.15825/

jacksie66

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rex-x

jacksie66 wrote: »

So it turns out the catalytic converter just after the engine is gone. Had a mechanic look at least it today. I'm guessing a new one is pretty expensive so I'm gonna try and get one from a scrap yard. Hope this fixes it..

I'm not convinced to be honest

shietpilot

The cat has nothing to do with that code

jca

jacksie66 wrote: »

So it turns out the catalytic converter just after the engine is gone. Had a mechanic look at least it today. I'm guessing a new one is pretty expensive so I'm gonna try and get one from a scrap yard. Hope this fixes it..

That's a symptom of the rich running unless you sort out what's causing the fuelling problem your replacement cat will die too.

jacksie66

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Cerebrum

Unless by "cat gone", they mean that the precat is leaking.

jacksie66

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