Question about 2003 BMW 5 Series

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No spark I have a 520 tourer 1998 model. Replaced the old flat battery with a slightly larger battery that got from a friend. Started first time after a few on and offs with the engine, thought all was fine. Next morning going to work tried to start but engine just gave a few coughs and splutters, then nothing. Engine rocker cover was removed to check chain-all okay. Removed plugs- soaking wet with petrol. I am not getting a spark now, could i have damaged an electrical part that controls the spark with the oversized battery.

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  • wassle Sep 27, 2008

    Thanks ..but all electric seem okay apart from the obvious engine failure. Bought a new battery today to rule out this. Not 100% sure how to check for spark as each plug has is own coil. these look a bit odd to check- does the coil need earthed or do you just fix the plug in the spring loaded cap and go for it?

  • wassle Sep 28, 2008

    job done :) ...Original fault was down to worn spark plugs and flat battery. Trick to restarting was to clean up old plugs then heat plugs with gas flame - I used portable camping stove. Turned over engine (30 secs) without plugs in to dry up cylinders reinserted hot plugs (with gloves on). Turned over engine- it took a good while to start running normally- thanks to my new battery. Going to treat the car to a new full set of plugs tomorrow and fingers crossed that should be that......

    Note: Speaking on the phone to BMW emergency call out services. To restart a flooded BMW engine he recommended keeping the throttle to the floor for a 15 sec period? Seemed to work for me apart from the fact that it was more like 2 mins before it started.

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Could of damaged a main fuse does the car do anything?

Posted on Sep 26, 2008

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