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Found 1 result

  1. dazh90

    525e No Starter. No spark

    Hi all, I have a 1987 525e (Motronic) which after spending two weeks in America, i come back to my car and she refuse to fire. I've done what i can and im out of ideas so really hoping someone can help! Also, worth mentioning that on the day that i got back and i realised the car refused to fire up i went to the petrol station and got £12 worth of fuel and some carb cleaner to assist a start. SHE STARTED UP! left running fine for 10 minutes but when ignition was switched off she refused to start immediately after (STRANGE, what is going on!?) . Problem/Symptoms; - No spark to any of the plugs apart from a single spark when coil is engaged at Pos3 - I believe im getting fuel as plugs are wet The facts; (strange results shown in RED) - Engine turns over by the key, top of engine moves (in time) with bottom - Brand new distributor cap and rotor arm - Brand new ignition coil - Swapped out CPS with one i had from 520i e28 (same hardwired one facing front harmonic balancer) - Swapped out main fuel relay with one from 520i - Swapped out MAF from 520i (i know it's trivial but, meh) - Checked for 12v heading towards the coil between 15+ and 0. (12v upon pos3, 10v when cranking) - Although coil is new, Resistance across posts all check out fine - Spark plugs are 2 months old - Continuity between both ends of main HT lead (coil tower to distributor) - Battery charged fully externally inside the house - DME socket where relay fits; - Tab30 suppose to have 12v, shows 0v - Tab85 suppose to have 0v, shows 0v - Tab 86 suppose to have 12v, shows 0v - Tab 87 and 87 suppose to both show 12v, shows 12v - Tab 87 and 87 suppose to both show 0v, shows 12v with ignition off - Checked for click from DME relay, it clicks just fine and i get the engine hum Questions that i am asking myself; - If my 520i M20 uses Jetronic fuel injection, and my 525e M20 uses motronic, why do they both have the same hard wired (no clip, needed cutting and soldering) crankshaft position sensors? - Why do i only get one spark when ignition is turned on, but none whilst cranking? - Does p.d towards the coil normalling drop from 12v to 10v when cranking? - Why did she start ONCE but refused to start immediately after? - Is my ECU fried? and if so.... why? only sat for 2 weeks... Any help is very much appreciated!! Regards, Darren (From Brighton)
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