Poor spark on rear leading...
#1
Poor spark on rear leading...
The car has been tough to start and I've found that there is poor spark on the rear leading plug.
I put a timing light on it and it is intermittent. It sparks ok for a second and then cuts out, then ok again. When I rev the engine, there is no spark on the rear leading at all.
The front leading sparks fine under all conditions.
New plugs, new wires.
Would this indicate a bad coil or bad wiring?
I'm leaning towards the coil, since the front leading is working fine and they are fed by the same 2 wires, which go to the same coil.
I made a repair to that harness, so I'm going to check the wiring now.
I put a timing light on it and it is intermittent. It sparks ok for a second and then cuts out, then ok again. When I rev the engine, there is no spark on the rear leading at all.
The front leading sparks fine under all conditions.
New plugs, new wires.
Would this indicate a bad coil or bad wiring?
I'm leaning towards the coil, since the front leading is working fine and they are fed by the same 2 wires, which go to the same coil.
I made a repair to that harness, so I'm going to check the wiring now.
#6
The coil resistances check out fine.
When I pulled off the wires one of the terminals came off at the coil. I temporarily fixed that and checked resistance on the wire. Wire is good.
I checked the spark at cranking and the rear leading sparks during cranking, but once it starts up the spark is intermittent.
I tried switching the leading wires at the plugs and whichever plug gets the L2 wire does not spark properly.
Then I put them back to normal.
I also tried switching them at the coil and the L2 didn't put out a spark on the L1 wire. Meanwhile, the L2 wire was sparking fine on the L1 output. What the hell? I'm gonna check the plug I guess..
When I pulled off the wires one of the terminals came off at the coil. I temporarily fixed that and checked resistance on the wire. Wire is good.
I checked the spark at cranking and the rear leading sparks during cranking, but once it starts up the spark is intermittent.
I tried switching the leading wires at the plugs and whichever plug gets the L2 wire does not spark properly.
Then I put them back to normal.
I also tried switching them at the coil and the L2 didn't put out a spark on the L1 wire. Meanwhile, the L2 wire was sparking fine on the L1 output. What the hell? I'm gonna check the plug I guess..
Last edited by alexdimen; 12-28-07 at 05:29 PM.
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