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Capital oven/range model PSGR366: back range igniters rarely spark

Update: corrected the igniter module part number below.

The 3 back burner igniters on my Capital oven and range model PSGR366 spark only rarely. I can light them manually with a lighter and they work just fine. I have cleaned the burner caps and igniter tips. If I tilt the burner caps so they are closer to the igniter tips, they will spark consistently, but the spark is weak. The back igniters have longer wires leading from the igniter module than the front igniters as the igniter module is located at the front of the range. The 3 front burners work just fine. I also switched the igniter wires for the two left burners at the igniter module, and saw the same behavior: front igniter sparked, the back igniter did not. I noticed that when I plug the oven back into the outlet, I sometimes here a single spark. This does not happen every time I plug it back in.

The behavior is consistent regardless of which burner knob I use to trigger the igniters (all igniters are triggered by any of the burner knobs), so I don’t think this would be caused by poor contact in the burner knob switches. Plus the igniter module has separate power going to it, so I don’t think the power for the sparks goes through the knob switches, but that's just a guess.

My theory is that the igniter module (Tytronics model RI 120L-6 PA02 0042, see image) is outputting a weak pulse such that the back igniters with their longer wires aren’t getting enough voltage/current to spark consistently. However, the wires aren’t that much longer. Maybe a foot. A replacement is a bit pricey, so does anyone have any thoughts on what else it might be or what other things I could try? I have a digital multimeter. Can I diagnose the igniter module?

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spark depends on voltage. 1 ft of wire isn't going to make a diff. in the voltage. A weak spark indicates a lower voltage. If you swapped the front and back wires on the controller and the front became weak, then you have a defective controller putting out less voltage to the rear. If this "I also switched the igniter wires for the two left burners at the igniter module, and saw the same behavior:" means the back continued to be weak, then you have a wire problem, or possibly a partial short on the spark tips, maybe caused by grease or food debris. The wires are like auto spark plug wires of old that had resistance in them, they can increase in resistance and weaken the spark, so you might just need new wires. The resistance is there to reduce RFI.

The voltage is too high to read with DVM

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Thanks for your response! The back continued to be weak after I switched the wires. But why would all (all 3) back igniters have the same problem? We use the back burners far less than the front burners, and there is far less accumulated grunge back there. I guess if all the wires were having increased resistance over time, then the longer wires would have more resistance than the shorter wires over time, so maybe that would explain the difference? Very interesting about RFI! I would never have guessed that.

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I'm having trouble finding which igniter wires I can use. Seems like I might replace the spark tips while I'm at it, but also having difficulty finding out which ones would work. Parts diagrams for the PSGR366 model that I can find don't include these parts. Any ideas?

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