Question about 1991 Volvo 740

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I just changed out the rotor, cap, wires and spark plugs on my 1991 740 Volvo (4 cycl fuel injection). I will not start and seems to be missfiring. I want to confirm the proper plug wire routing to the distributor cap.

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If you are looking at the distributor (mounted in behind the camshaft:
The order is 4,3,1,2. Cylinder 4 is closest to the distributor and cylinder 1 is at the timing belt side of the engine. 4 is on the far left of the distributor cap, 2 is the last one on the right.
If you continue to have starting and running issues, and all other issues related to air and fuel have been vetted out, the crank angle sensor is next on the list. Usually the system cannot detect Cylinder 1 and it will guess as to what Cylinder 1 is before it gives up. If you meter the sensor (three wires), two will meter between 200 and 300 ohms. Still no-go? Make sure your fuel system is working properly. On Regina models, the oxygen sensor is a PTC resistor, and on Luftmassenmesser Hidstraht it is a galvanic battery. They are not interchangeable.
On Regina models, check the ignition coil connections. This is the square box on the driver side suspension turret - it is removable and the coil can be separated from the control unit. There are two connectors for the coil, what happens is they start to galvanize over time.
On LH models, the coil is on the passenger side suspension turret. Check those connectors as well. Also on LH models there is a Power Stage (a couple of transistors) on the front of the engine bay, aside the battery. Although you can test it, it is better to change it since the heatsink grease is usually baked by now, resulting in overheating of the joints in the case.
On Regina models, you do not have the Power Stage there - it is integral with the coil.

Posted on Jan 28, 2011


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