Question about 1984 Mazda RX-7
I need to know how to check trailing ignjtion spark plugs on 84 madza rx7
If your tach does not work that is a symptom. Of course a timing light is most useful. If not you can coil wires (swap with known good wire) ; check ignitor,(swap trail/lead ignitor plugs at distributor) coil, check with ohm meter.
Trailing ignitors are very common failures, especially when either jump starting or being jump started when a battery is stone dead. What happens is there can be a huge power spike through the ignition system damaging the electronics in the ignitor. 90% of trailing ignitor failures happen during a jump start procedure.
At this age though, wires and coils can be suspect. My recommendation for ignition parts, Mazda Mitsubishi Cap/rotor and NGK wires and plugs. They are good enough for Mazda factory race teams and I have been using them since 72 with no ignition related failures in racing or all the street vehicles that have been maintained. Most critical is the fit of the rotor, it should be very hard to install, very tight fit. If loose the rotors have a tendency to rotate and move causing changes in timing and at worse damaging the cap and rotor.
Posted on May 04, 2014
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Posted on Jan 02, 2017
The cylinder order is 1,2,3 (rear row, left-to-right) and then 4,5,6 (front row, left-to-right).
When replacing spark plug wires or plugs, it's very helpful to do one at a time to avoid connecting them incorrectly.
Hope this helps, Sherwin
Posted on Dec 29, 2009
For Mazda Car 2005-06 Spark Plugs...
Inspect the electrodes and ceramic insulator.Burned or worn electrodes may be caused by:
Advanced ignition timing Loose spark plug Plug heat range too hot Insufficient cooling
Fouled plug may be caused by:
Retarded ignition timing Oil in combustion chamber Incorrect spark plug gap
Plug heat range too cold Excessive idling/low speed running Clogged air cleaner element Deteriorated ignition coils
Do not adjust the gap of platinum tip plugs; replace the spark plug if the gap is out of specification. The gap should be 0.049-0.053 in. on all models except Mazdaspeed6 or 0.028-0.031 on Mazdaspeed6 models.
Good luck(remember rated and comment this help).
Posted on Mar 07, 2010
SOURCE: On my 1985 rx7 12a
The coils might be wire in reverse polarity. The FSM diagram shows that the B/W ground wires go to the terminals and the yellow striped wires go to the - terminals which is different than most.
Posted on Oct 22, 2010
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