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Feb 22, 2017 12:28:17 GMT
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Any rotary guru`s out there, my grandsons RX7 as just started playing up its not firing on the top spark plugs, there is a good spark so its not electrical
I put new plugs in and it made no difference , put some old plugs in and they were getting wet so its getting fuel,
With the new plugs in you can pull the top plug leads of even with the engine revving high and it makes no difference, what it does do now and didnt before it started playing up is backfire when revving high , at one point it made a knock and a clatter then the noise went away
Any advice welcome as i cant find any answers on the no pistons forum
Thanks
Dave
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Feb 22, 2017 12:49:47 GMT
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You say there is a good spark, is this on the leading and trailing plugs? As you also say it's not firing on the trailing (top) plugs
Have you swapped plug leads from leading to trailing (at both ends) to eliminate the leads? Have you checked the coil packs?
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Feb 22, 2017 16:50:13 GMT
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Hi thanks for the reply , there is a good spark on all the plugs so no problem with coil packs or leads , its just not firing on the top plugs no matter how high it revs,
I put new plugs in just in case they were breaking down makes no difference , think I will do a compression test see what that shows
Thanks
Dave
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Feb 22, 2017 20:36:32 GMT
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Stock ECU? Are you on FDUK? Might get a better response, I've not had an FD for about 7 years now and have forgotten most of the bad stuff and only remember the noise and power.
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lightyearman
Part of things
GYJDM - Grimsby based Japanese car club - Find us on Facebook
Posts: 639
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Feb 22, 2017 21:19:50 GMT
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My 13B is an NA injected unit from an FC RX7 but I had similar problems at one point, after changing both coils, rotor arm and dizzy cap it turned out two plugs had completely died and one was weak as a weak thing. 4 new plugs and it was sweet as a nut.
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ian65
Part of things
Posts: 276 
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Feb 22, 2017 21:40:15 GMT
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what year is the car? is it running a carb or fuel injection? Dizzy or crank angle sensor?
The trailing plugs mainly clean up emissions... it should still run ok on just the leading.
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Last Edit: Feb 22, 2017 21:50:26 GMT by ian65
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Feb 23, 2017 10:50:47 GMT
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Hi Ian its an 89 (G reg ) fuel injected with dizzy, he had to use it yesterday its still the same totally gutless i pulled out one of the new top plugs this morning before going to work and it looks like its not been burning totally clean in the middle with just a trace of engine oil on one side so maybe its not getting enough fuel
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