Runs while cranking; dies when you let go of the key

krivman65 · 05-05-2012, 02:23 AM

Ok. I am stuck. I have an '84 ignition system with electronic pickups. The engine fires and runs while I am cranking on the starter, but once I let go of the key it dies. Any thoughts? There are no points, so no ballast resistor. Could it be a bad ignition switch?

Thanks!

FC Zach · 05-05-2012, 03:15 AM

Is your compression OK?

GySgtFrank · 05-05-2012, 09:49 PM

Check to make sure that you have coil power on the run circuit (key on, no start). I ran into the same type of problem going from 1st Gen to 2nd Gen electronics. There was a difference in those as well. The first gen (79 RX7) ignition had power to the start, but no power thereafter and another wire carried power during both start and key on. The 2nd Gen (87 RX7) had power on one wire except during start and another wire that had both. If you have the coils hooked to the wrong wire, it could cause this problem. Best bet is to break out the multimeter and see which wires have power when.

krivman65 · 05-06-2012, 10:06 AM

Yup! Compression is fine. Ya... I'm going to look through my diagrams some more and get out there with my meter to see what happens.

cshaw07 · 05-07-2012, 07:48 AM

id bet its ignition switch.

GySgtFrank · 05-10-2012, 12:44 PM

Any luck Krivman?

lilbluescout63 · 05-13-2012, 07:47 AM

this happened to me twice once in my 79 it was the inside fuse it died at a light and i had to turn key and get it accross the road uner stsrter power and than 2nd time on my 80ls it was the back side of the ignition the tabs worked loose and the rear part was loose . micht check that.

730RWHP12A · 05-19-2012, 09:26 AM

bad grounds

05-05-2012, 02:23 AM	#1
krivman65 Rotary Fan in Training Join Date: Apr 2011 Location: McPherson, KS iTrader: (0) Posts: 37 Rep Power: 0	Runs while cranking; dies when you let go of the key Ok. I am stuck. I have an '84 ignition system with electronic pickups. The engine fires and runs while I am cranking on the starter, but once I let go of the key it dies. Any thoughts? There are no points, so no ballast resistor. Could it be a bad ignition switch? Thanks!

05-05-2012, 03:15 AM	#2
FC Zach RCC Loves Me Not You Join Date: Mar 2008 Location: Eagleville, TN iTrader: (2) Posts: 2,267 Rep Power: 19	Is your compression OK? __________________ 1993 Yamaha GTS1000 1992 Celica Turbo AllTrac 1987 RX7 Sport 1979 Yamaha G1, KM24 powered 1975 Dolmar KMS4

05-05-2012, 09:49 PM	#3
GySgtFrank Professional Stick Poker Join Date: Feb 2011 Location: Stafford, Ks. iTrader: (0) Posts: 1,005 Rep Power: 15	Check to make sure that you have coil power on the run circuit (key on, no start). I ran into the same type of problem going from 1st Gen to 2nd Gen electronics. There was a difference in those as well. The first gen (79 RX7) ignition had power to the start, but no power thereafter and another wire carried power during both start and key on. The 2nd Gen (87 RX7) had power on one wire except during start and another wire that had both. If you have the coils hooked to the wrong wire, it could cause this problem. Best bet is to break out the multimeter and see which wires have power when. __________________ 1979 SA22C (parts of one anyway) http://rotarycarclub.com/rotary_foru...ad.php?t=15585 1975 MG Midget (building) http://rotarycarclub.com/rotary_foru...ad.php?t=18681 1988 N/A SE model FC, dead stock and less than 85k on the clock. This one actually runs, so I don't fuck with it.

05-10-2012, 12:44 PM	#6
GySgtFrank Professional Stick Poker Join Date: Feb 2011 Location: Stafford, Ks. iTrader: (0) Posts: 1,005 Rep Power: 15	Any luck Krivman? __________________ 1979 SA22C (parts of one anyway) http://rotarycarclub.com/rotary_foru...ad.php?t=15585 1975 MG Midget (building) http://rotarycarclub.com/rotary_foru...ad.php?t=18681 1988 N/A SE model FC, dead stock and less than 85k on the clock. This one actually runs, so I don't fuck with it.

05-19-2012, 09:26 AM	#8
730RWHP12A Rotary Fanatic Join Date: Mar 2008 Location: chatsworth, california iTrader: (8) Posts: 349 Rep Power: 17	bad grounds __________________ rotaryshack.com

05-06-2012, 10:06 AM	#4
krivman65 Rotary Fan in Training Join Date: Apr 2011 Location: McPherson, KS iTrader: (0) Posts: 37 Rep Power: 0	Yup! Compression is fine. Ya... I'm going to look through my diagrams some more and get out there with my meter to see what happens.

05-07-2012, 07:48 AM	#5
cshaw07 The Newbie Join Date: May 2012 iTrader: (0) Posts: 12 Rep Power: 0	id bet its ignition switch.

05-13-2012, 07:47 AM	#7
lilbluescout63 The Newbie Join Date: Dec 2011 iTrader: (0) Posts: 3 Rep Power: 0	this happened to me twice once in my 79 it was the inside fuse it died at a light and i had to turn key and get it accross the road uner stsrter power and than 2nd time on my 80ls it was the back side of the ignition the tabs worked loose and the rear part was loose . micht check that.