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Hi,
A no Crank situation, means to me, that the engine will not turn over by the starter. This is cranking.
A no start situation, means to me, that engine is turning over by the starter but you do not hear the engine firing one or more of its cylinders.
I find it interesting that you must have the cover off of the system relay in order to observe each half.
The halves being in the control of the injectors being able to fire! The other half turns on the fuel pumps.
If the engine spins, both contacts should be pulled in or made up to complete a circuit.
Around 1990 onwards the ECU temporarily fires on the fuel pumps to pre-pressurize the fuel rail for a second or so in the key position Two. It will not turn on the injectors or the pumps again until it sees a signal or the ignition switch is shut off to on again.
This system relay is a safety system used to shut down the fuel system when ever the ECU computer does not receive a pulse signal from the ICU.
The ICU, on all Volvos, has to receive a signal from either the hall sensor built into your 1986 distributor or the Crank Position Sensor (CPS) on 1989 and later 240 Volvos. If you lose that capability nothing happens as far as starting or running.
If the distributor is stopped turning then that means, nothing or nada as well! A thrown timing belt can be the number one cause for when a Volvo is found dead anyplace. Timing belts are so neglected for tension and get oil on them from an aged seal.
Cranking is a whole different story.
If you heard a noise maybe the starter took a hike! If its top bolt wasn’t tightened in place by Sven the Swede, it could have rattled loose in its hole!
That’s ok though, because if you ever owned an older Harley-Davidson, you could lose your Two Pound, Delco Car Horn or find it dangling by its wire after it hit you in the shin at a stop light.
The bracket holding them on was between the two cylinders and broke all the time. That is, until I made mine out of 1/8” Stainless steel.
Good luck
Phil
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