06-10-2017, 11:56 AM
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Join Date: Jun 2000
Location: Cape Town, South Africa/Mainz, Germany,
Posts: 1,601
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In the 90s I had the most troublesome ECU controlled cars in our shop. 90% of failures are gound related.
The crank sensor is very sensitive when it comes to gapping and a pick up behind the balancer might help (axial instead of radial, if my english doesn't fail me).
ECUs typically have a compensation for voltage drop when starting with a weak battery or in winter to "convince" the management system to start irrespective. Dending on the range you could just be too low.
A welding cable for negative from the battery direct to starter cannot be a mistake (35 or 50 mm2).
Good luck!
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