I have been killing my poor brain looking for the answer to the very seriously annoying problem I am having with my 91 Integra. It would start and immediately stop and for the life of me I have not been able to figure out why. I tried checking the distributor and coil, spark plugs, alternator and related belts, new fuel filter (because this problem started right after filling up at a gas station with a nearly empty tank but the car eventually started then... the problem started then and would happen occasionally) After reading this forum (https://www.hondacivicforum.com/m_82668/tm.htm) and checking the car one more time I found that the alternator light was not coming on as it would normal when everything was alright with the car. After examining the wiring diagrams I am almost certain that the only thing that makes sense as to why the motor would run with the ignition key keeping the starter going but immediately stop upon release would be that the MAIN RELAY was not functioning. Thank you so much for more than likely ending what felt like mission impossible troubleshooting this nightmare!

 

Sounds like you did all the work. Welcome.

 

[sm=welcomesign.gif] to hcf

 

stick around