#3 and #4 cylinders not firing

[wh2]

Question for the knowedgeable.. Wheres a good place to start troubleshooting for right side cylinders not firing.. I think the coils are bad .. But is there something that would make both cylinders stop. Thanks for any input..

[V7Goose]

It is unlikely that you have bad coils - this is NOT a common failure, and to have two of them go bad at the same time would be very very strange. There is nothing common in the ignition system between any two cylinders on this engine, either left/right side or front/back, so I cannot point out any typical place to start looking for such a failure.

 

If you truly have no spark, I'd start by removing the plug caps and checking their resistance - should be around 10K. When you check the coils with an ohm meter, you cannot follow the procedure in the shop manual; it is wrong. Both the primary and secondary windings share a common lead, and neither is tied to ground. this is shown correctly on the schematic, and the resistance figures from the shop manual are correct if you use the right connections when measuring.

 

If the coils are good and they are not being triggered, that pretty much just leaves the ignitor or any of the wires. Only real test here is to swap in a known good ignitor.

Goose

[wh2]

Thanks for the info .. I checked both plug caps and they were good I will go to the igniter now,,