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940 B230FK occasionally losing power / stalling

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Old Apr 22nd, 2024, 10:39   #6
360beast
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It could be many things, it could be the fuel pump relay is getting hot breaking the contact, probably a dry solder joint that gets hot and then loses continuity until it's cooled down enough to resume normal service. You can test this one when it dies by quickly cranking the car by literally just flicking the key to start and instantly turning it off. Then turn the ignition back on and if the pump primes it's probably the relay, also put your hand on it (big white relay behind the ash tray) and see if it is hot.

My mate had a similar issue to yours that turned out to be the MAF but that was because it had an eBay special MAF on it, a used Bosch one cured it.

It could also be the crank sensor breaking down due to heat and then once cooled down it starts working again. An easy way to test this one is when it dies pull the king lead off the distributor and stick a spark plug in the end and rest it on the block then crank it, if there's no spark or a very weak (orange/yellow) spark then it will be the crank sensor.

120k miles is nothing for these, mine is on 197k on the original pump etc, the only sensor that's been changed is the ECT sensor.
That should say if the pump DOESN'T prime then it's probably the relay.
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