Misfire on idle B230FK 940

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Misfire on idle B230FK 940

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Jan 14th, 2018, 13:33	#1
ie940 Senior Member Last Online: Apr 19th, 2024 11:35 Join Date: Jun 2010 Location: East Mids	Misfire on idle B230FK 940 Volvo 940 estate B230FK 2.3 1996 Developed a misfire on idle only. Drives and accelerates fine. Cylinder 1 has the problem. If it's idling, very lumpily below 1000rpm, then I can pull the #1 HT lead or injector plug off and the idle doesn't change. It'll pop and fart on the exhaust, but unplugging the injector stops this. I've changed the injector, checked it's ohms, changed the FPR, cleaned and gapped the plugs, fitted new Bosch leads, cleaned the recently replaced Beru cap and rotor arm. Compression is slightly down on #1, but not to the point it wouldn't run? Approx 120psi opposed to 135psi on the other cylinders, which equates to low 8 bar instead of the Haynes specified 9 minimum. Thoughts?

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