AQ125 Volvo Penta spark problem

[208017343]

I am having problems getting spark plugs to fire in a AQ125 Volvo Penta in a 1983 Bayliner Capri. I put in new NGK BPR6ES plugs which are supposed to be a good cross reference to the Bosch W6DC shown on the engine, but I get no spark. I can get spark when I put in Autolite 2852 spark plug that came from an old outboard Force motor that I had laying around. I checked it on all 4 cylinders , so I doubt I have 4 defective new spark plugs. I did all this with the old ignition coil in which has an external resistor. I put in a new iginition coil with an internal resistor because I was going to install an electronic ignition conversion kit. I thought replacing the coil might fix the problem, but still no spark. Before I install the conversion kit I want to make sure the plugs are sparking. Any thoughts?
Thanks,
John

 

[NYBo]

Re: AQ125 Volvo Penta spark problem

Check the kill switch and its wiring.

 

[Mullin]

Re: AQ125 Volvo Penta spark problem

Did you unscrew the resistor from each spark plug? The plug wires won't hold onto the resistor and so won't have a good connection.

The spark plug wires are designed for non-resistor plugs and all the replacement plugs have a resistor pre-installed on them. Just unscrew it from the plug and re-install. You should notice the feel of the plug wire as it makes a good connection on the threads of the spark plug.

The R in BPR6ES and WR6DC stand for resistor. You simply un-screw it from the plug to have a BP6ES or W6DC.

I did all this with the old ignition coil in which has an external resistor. I put in a new iginition coil with an internal resistor because I was going to install an electronic ignition conversion kit.

Did you remove the external resistor? You don't want the new coil resistance doubled down on.

 

[Maclin]

Re: AQ125 Volvo Penta spark problem

When was the last time new points installed and dwell/timing adjusted?

 

[M. Michael Motorcycle]

Re: AQ125 Volvo Penta spark problem

I am having problems getting spark plugs to fire in a AQ125 Volvo Penta in a 1983 Bayliner Capri. I put in new NGK BPR6ES plugs which are supposed to be a good cross reference to the Bosch W6DC shown on the engine, but I get no spark. I can get spark when I put in Autolite 2852 spark plug that came from an old outboard Force motor that I had laying around. I checked it on all 4 cylinders , so I doubt I have 4 defective new spark plugs. I did all this with the old ignition coil in which has an external resistor. I put in a new iginition coil with an internal resistor because I was going to install an electronic ignition conversion kit. I thought replacing the coil might fix the problem, but still no spark. Before I install the conversion kit I want to make sure the plugs are sparking. Any thoughts?
Thanks,
John

Are your wires solid core?

Electronic ignition does not like solid core wires and you won't get a spark. It looks like you haven't don't the electronic ignition upgrade, but just a heads up. Wasted a lot of time, read hundreds of forum posts and never found a word about solid core spark plug wires and electronic ignition. I had to find out the hard way.