Q. IT’S INCREASINGLY hard to start my BMW. I’ve replaced the battery and had the fuel line checked. What next?
CP, Ruislip, London
A. Check the battery connections and tighten them with a spanner if necessary. Remove any corrosion with a wire brush; a poor earth connection can result in insufficient voltage at the spark plugs, hence a weaker spark and sluggish starting.
Also, look for leaks around the fuel injectors and get a specialist to check the fuel pressure and fuel pump — a problem with either could mean fuel is not being injected into the cylinders properly.
If none of that helps, the fault could be electrical, requiring a full diagnostic check at your dealership or a BMW specialist.
Dave Pollard has written several Haynes manuals and has tested just about every car-related accessory — read more from Dave here.
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