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960 motor change great -now no start. 900 1992

posted by  M on  Fri Dec 17 03:09 CST 2004
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last visit: Sat May 1 10:12 CST 2010
[RELATED]

First - the slow start is no error sign, or at least not if you ask Volvo. The ECU simply is programmed not to fire before a certain amount of revolutions are completed (eight, if I counted right). Extremely annoying, especially with a hot engine when you k-n-o-w it could fire up on the first rev.

No spark a-n-d no fuel points to a main ECU power problem or the crankshaft sensor.

The check engine lamp will tell if the sensor is working - it should go out after one or two starter revs, well before the engine starts, as a sign of correct readings. If the lamp stays on or flickers while the engine refuses to start, there is a connection/sensor problem.

I've had intermittent no-start problems, finally diagnosed to be the sensor connector (two pole at the left rear of the cylinder head. Try plugging/unplugging this connector a couple of times and check for oxidation.

Grounds are always easy to forget. The stupid ground point at the rear of the head, below the mentioned crankshaft/camshaft sensor connectors, is worth checking.

Martin

--
'65 121, '73 165






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