Vauxhall corsa 1.2 twinport 2008 z12 xep - Poor performance

Honest John Back Room » Technical matters
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Sat 10 Apr 2021 16:27
Vauxhall corsa 1.2 twinport 2008 z12 xep - Poor performance - strickjumpers

Hello.

After rebuilding the top end of the engine after a boiling and then head skim.the performance is very poor..pressure test reveals all cylinders within 5% about 180 psi.valve timing checked ok.new plugs and coil pack.new camshaft sensor.

Just does not respond well to throttle. Tick over is a bit rough.

Could the ECU have restricted the engine when overheated?

I have replaced the battery for a new one so sat overnight disconnected. Any further ideas welcome.thank you. Mike

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Sat 10 Apr 2021 19:01
Vauxhall corsa 1.2 twinport 2008 z12 xep - Poor performance - blindspot

hope you sort it. but my experience of rebuilt engines has always been a disappointment.

.

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Sat 10 Apr 2021 19:20
Vauxhall corsa 1.2 twinport 2008 z12 xep - Poor performance - elekie&a/c doctor
Unfortunately these engines don’t take kindly to being overheated. Any sensible garage will not take on one of these that’s been cooked . I would start with a few basic tests . Can you read live data of coolant temp and lambda values? I would also try and get a vacuum gauge plumbed into the inlet manifold.
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Sat 10 Apr 2021 23:54
Vauxhall corsa 1.2 twinport 2008 z12 xep - Poor performance - Big John

After a rebuild but compressions good I'd also check things disturbed - eg gaskets.

Is the new coil pack OEM?

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Sun 11 Apr 2021 07:56
Vauxhall corsa 1.2 twinport 2008 z12 xep - Poor performance - Oli rag
I would check the valve timing for rough running and poor performance. The timing chain may have been put back on one tooth out.... check the timing marks again.
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