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The only place for a coil spring is up Zebedee's arse
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Car has been stood over the (prolonged) winter. Got it started and idle was lumpy. Let it warm up, revved it a few times, fault seemed to clear. Stuck it in SPORT and gave it some beans on the way to MoT.

No faults found except CO emissions 3.5 percent on fast and slow idle tests. He also said they were okay initially, but started rising.

It was presented and tested with the PRINS LPG engaged and fuel level showing 3-4 lights.

The car has a conical air filter, which had disconnected from the inlet. Timescale unknown. It has passed successfully with that mod.

I've Googled a few probable causes (a couple with exact match to circumstances) but prefer to see if anyone here confirms them.

I have a Nanocom, but no idea what to look for in live readings.

Car is SORNed so I'm very limited re: test driving.

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Use the Nanocom to check the O2 sensor outputs. Prins is a slave system so follows the fuelling for the petrol system. Any fault on the petrol system will also show on LPG.