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1990 RX-7 GXL Idle and Stalling Issues

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Old 12-07-17, 05:53 AM
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1990 RX-7 GXL Idle and Stalling Issues

Hi, Iíve had my RX-7 GXL for a little over a year now. It was bought out of a field in non running condition. It hasnít hit the road yet, but lots of progress has been made. Currently, my roadblock consists of two issues. My first issue is that it appears as though itís misfiring while idling, and my second issue is that it stalls while being driven after being warmed up. The fuel pump, fuel filter, spark plugs, and pedal assembly have all been replaced. Currently injectors and vacuum lines are on their way. Iíll leave a link at the bottom of this thread of the car idling to give you guys a better idea of whatís happening. Does anyone have any insight as to what my problem may be? Thanks in advance.
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Old 12-13-17, 07:25 PM
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Old 12-13-17, 09:29 PM
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I'm not sure if its the video, but it sounds like your only running on 1 rotor. Compression test, make sure you have spark at all 4 plugs, and if that all checks out, put the injectors and new vacuum lines on and it should help greatly
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Old 12-14-17, 12:06 AM
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Yeah, does sound like it could be on one rotor. Do what lduley says. First, check that you have all of the spark wires in the right place and that you are getting spark at all of them. If that checks out, do a compression check. Pull one plug and make sure the pulses are even, then replace and the same on the other side, then take out one on each rotor and make sure they are roughly the same. If that checks out, move to the injectors. Not sure of an easy way to check it, but it sounds like you have new ones coming it.

Also, the video is too short to tell for sure, but it sounds like you have a hell of a vac leak somewhere.
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Old 12-14-17, 12:17 AM
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its not running on one rotor, its doing the S5 idle dance, by retarding and cutting fuel in an attempt to get the idle to settle down at 1100 and below, usually unsuccessfully. this is caused by an idle thats set too high or a thermowax that isn't opening as it should.
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Old 12-14-17, 02:31 AM
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Thanks a lot for the responses! Iíll definitely start by making sure Iím getting a spark at all 4 plugs and that theyíre in the correct locations. While I donít have access to a compression tester at the moment, I will check for even pulses from both rotors, and if need be, pick up a compression tester. For some extra information, the car does have a nasty exhaust leak, which is whatís causing a lot of the noise. Also, when going through itís cold start procedure, the car seems to run perfectly. However, once the procedure ends and the idle drops, the issues surface. Iím thinking about checking the BAC valve and, after your comment, the thermowax to make sure those are in order. The TPS has already been adjusted, so I donít think thatís the issue. Vacuum lines and injectors should be coming soon. Any extra opinions would be appreciated.
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Old 12-14-17, 08:48 AM
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Originally Posted by insightful View Post
its not running on one rotor, its doing the S5 idle dance, by retarding and cutting fuel in an attempt to get the idle to settle down at 1100 and below, usually unsuccessfully. this is caused by an idle thats set too high or a thermowax that isn't opening as it should.
that would explain the dead rotor sound then, the retard is trying to retard itself more retarded
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