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 Post subject: Sh5 cold idle low/ shuddering / stalling
PostPosted: Sun May 13, 2018 11:51 pm 
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Vehicle: My00 s/turbo

Posts: 181
Location: Nairobi, Kenya
It's a 2008, and when cold the revs are so low it stalls, coughs shudders.... Basically all the symptoms of an engine running at 200 rpm

Sometimes When I rev it the speedo goes to 120kph and stays there until I restart the engine (this is an in frequent issue)

After a minute it's much better

There is no engine light and I've scanned with no faults

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 Post subject: Re: Sh5 cold idle low/ shuddering / stalling
PostPosted: Mon May 14, 2018 11:23 am 
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I Say: Plan for tomorrow,Live for TODAY!
Vehicle: MY12 XT

Posts: 84
Location: Sydney
Hi, Try reseting the ECU.
While the engine is cold.
Disconnect battery, push brake pedal for 20 seconds.
Reconnect battery, start engine and let it warm up.
Take it for a drive.

This allows the ECU to re-learn the A/F ratios whilst cold.

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 Post subject: Re: Sh5 cold idle low/ shuddering / stalling
PostPosted: Mon May 14, 2018 12:00 pm 
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Vehicle: MY08 XT (SH)

Posts: 1142
Location: Brisbane
Perhaps also check for vacuum leaks.

I understand (?) that most cars run rich on a cold start (rather than stoich based on the O2 sensor). If more air is getting in than expected the cold-start rich mixture (as defined by the tune rather than by sensors) may not be rich enough for a smooth cold start.

Or I could be talking out my backside. Someone with a better tuners' brain would be a better authority. But checking for vacuum leaks is still a good thing.

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