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Registered User
Join Date: Feb 2019
Posts: 1
BMW Roundel engine dies without warning on a december 1988 635 csi highline

I have the problem above started about 5 years ago then stopped, started over the past two months engine dies when driving . Turn key to off and then wait a few minutes and it starts again but stops wait about 30 mins then starts okay again. I have replaced fuel pumps, filter , o2 sender, plug leads, plugs plus rotor and cap, air flow and idle control valve, temperature senders, Angle crank sensor at front , fuel relay oh and a new ecu seems to be when warmed up or in hot weather . also had fuel pressure checked and had it smoked for leaks in system no probs. I am told the 635 when raced had a potential to just die and the fuel relay was to blame and on another forum it was told bridge the relay . ANY IDEAS AT A LOSS QWILKIN other than this the engine purrs
Old 03-02-2019, 02:40 PM
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old galoot
Join Date: Aug 2011
Location: Ventura, CA
Posts: 5
Go over the basics again.
Focus on the battery, alternator brushes/regulator, grounds. Have you cleaned the grounding conns and wires ends adjacent to the battery on the inner fender wall?
Is it a BMW spec battery? In good condition? Restart after a short period may indicate that the battery has recovered to an adequate voltage, above 12 volts, to serve the ECU, etc.
Also check the alternator brushes: I just replaced a brush brush had worn through the slip ring to the alternator shaft...intermittent issue as you described. Although doubtful given the 5-year history.
Other remote possibility is a bad wire in the loom or connection to the MAF, crank sensors, throttle position
Ignition coil? Electrical feed to the coil
Old 03-10-2019, 07:49 AM
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