Not Starting

[volvo always]

Originally Posted by Lolvo 940

Could be the rsr (radio suppression relay )
Near the ignition amplifier. Can bypass with a wire to coil if u have no spark?
Had that on a 940 before .

What does it look like, thanks?

James.

[volvo always]

Originally Posted by Laird Scooby

As far as i know, it's just a chip in the key - try your spare to see if it's that as that isn't unknown especially in Fords which just happen to use a similar system

Here's some pics, it's on my V6 but the bellhousing position is about the same :

:

Thanks for the pictures.

Unfortunately my spare key is 30 miles away! At Grandparents for safe keeping!

James

[Laird Scooby]

Originally Posted by volvo always

What does it look like, thanks?

James.

Just try the test i've outlined James, we'll find it after if it proves the point.

[Laird Scooby]

Originally Posted by volvo always

Thanks for the pictures.

Unfortunately my spare key is 30 miles away! At Grandparents for safe keeping!

James

D'oh!

[tofufi]

Originally Posted by volvo always

No, is it behind the glovebox? Which terminals do I bridge?

James

https://www.volvoforums.org.uk/showthread.php?t=240089



Good luck!

[volvo always]

I'm working most of tomorrow, so update tomorrow evening.

Thinking order a fuel relay anyway as not replaced it in the 4 years I have had the car. Pop to the factors in the morning before work, may arrive to collect later.

I'll refit the battery and see if it starts, if not try the +ve from battery to plus +ve to the coil. I take it I should connect the wire to the coils input +ve position?

I'll also give the fuel relay a wiggle or may open it up and see if solder joints look ok or not/re solder.

Once found the cause of the no start, I'll replace all the above items for preventative maintenance.

Many thanks. James.

[griston64]

Originally Posted by volvo always

I'm working most of tomorrow, so update tomorrow evening.

Thinking order a fuel relay anyway as not replaced it in the 4 years I have had the car. Pop to the factors in the morning before work, may arrive to collect later.

I'll refit the battery and see if it starts, if not try the +ve from battery to plus +ve to the coil. I take it I should connect the wire to the coils input +ve position?

I'll also give the fuel relay a wiggle or may open it up and see if solder joints look ok or not/re solder.

Once found the cause of the no start, I'll replace all the above items for preventative maintenance.

Many thanks. James.

If you get stuck with the fuel pump relay I have a few spares

Cheers

[TonyS9]

The radio suppression relay (very silly name), is for the fuel injector power supply not the coil.

If you are getting fuel pump priming normally with the whine, then look to this.

[Laird Scooby]

Originally Posted by TonyS9

The radio suppression relay (very silly name), is for the fuel injector power supply not the coil.

If you are getting fuel pump priming normally with the whine, then look to this.

Up to 1996, you're correct Tony. After that the coil was also supplied by the RSR and it's not that silly a name really. Originally the injectors were fed by the ignition switch so the back emf from the injectors was super-imposed onto the wire from the ignition witch which then by inductance transferred to the radio power feed. Reslt - interference!

Now the ignition switch only controls the operation of the relay which has the main power feed from the battery so any back emf from the injectors (and later the coil too) is absorbed by the battery behaving as a big capacitor. It's also a shorter run so reduces the voltage drop to the injectors and coil.

In 940s up to 96, it feeds the injectors and Lambda sensor heater. Post 96 it also feeds the coil.

[TonyS9]

Originally Posted by Laird Scooby

Up to 1996, you're correct Tony. After that the coil was also supplied by the RSR and it's not that silly a name really. Originally the injectors were fed by the ignition switch so the back emf from the injectors was super-imposed onto the wire from the ignition witch which then by inductance transferred to the radio power feed. Reslt - interference!

Now the ignition switch only controls the operation of the relay which has the main power feed from the battery so any back emf from the injectors (and later the coil too) is absorbed by the battery behaving as a big capacitor. It's also a shorter run so reduces the voltage drop to the injectors and coil.

In 940s up to 96, it feeds the injectors and Lambda sensor heater. Post 96 it also feeds the coil.

I know why it was called that, I'm involved in EMC compliance. Its just rather silly to call a component in your design after a result of the design having a fault. From my point of view it sounds like "defective design repair part", how does that help anyone?

Fair point if I was wrong about it supplying the coil aswell, I wasn't aware of that, good to know.