1988 Mazda RX7 88 convertible No spark from coils

JOHNNY HANDSOME

MEMBER
1988 MAZDA RX7
4 CYL
2WD
MANUAL
113,000 MILES

I have checked all as said in haynes book, Crank sensor, coils, main relay all gave good readings. Went to ecu opened it and saw a burnt ressistor or something blue, I replaed with an other ecu that is not from a convertible and I still get no spark please help.

3 Replies

RACEFAN966

MECHANIC
5,029 POSTS

OK if you don't mind here is the specs on the crank sensor. Between term G1 and G2 ohms should be 110-210 ohm. Between term Ne1 andNe2 should be 110-210 ohms as well. Here is pic for the term locations.

You need a tester to check the ignitor here is what they are refuring to. Do you have access to this tester?

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Tuesday, April 28th, 2009 AT 10:35 AM

JOHNNY HANDSOME

MEMBER
2 POSTS

Thanks for the quick reply, I have done the coil check with ohm tester and it gave a good reading the ignitor check is going to be impossible for me, I have no access to the tool.I did xchange both coils with another working pair and still no spark. Is the ecu different in a conv.I did change my N338 with a N3y6 would this be the problem? Crank gave good readings, main relay and coils. Could it be theft detterent ecu or similar problem.

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Tuesday, April 28th, 2009 AT 11:07 AM

RACEFAN966

MECHANIC
5,029 POSTS

The ignitor controls the coil to give it power so it will fire. Do you have acces to a known good ignitor? I will look for another way to test the ignitor in the mean time get back to me about a known good ignitor and then I will look for the module test too. This may help all you need is a volt meter. On the ignitor disconnect the 2 prong connector at the ignitor and hook the meter up in series with the black wire with yellow stripe terminals turn the ignition on and you should get 12 volts. Let me know what you find.

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Wednesday, April 29th, 2009 AT 10:20 AM