93 del sol won't start when ambient temp is above 85 F. Replaced the fuel pump. no help.

 

Check your ECT and IAT sensors... either of these reading way wrong will cause huge start up issues.

 

More description needed, Does it prime? Do you hear the master relay click? There are way too many possible just base on what you said, but I am sure it is a solder crack issue since it only happen when ambient is above 85F

 

The engine turns over so I can't hear whether any relays are clicking. Based on your response/questions and the response I got from JRCivic1 and some videos I've found on YouTube I believe it is probably the PGM-FI relay. I am old and do not do any work on cars anymore beyond washing them and I don't do too much of that. Over the next few days I will try and get this part replaced and then monitor progress. Thanks for the help.

 

It’s the Main Relay.. it looses its solders when it’s hot.. take it out, open it and check the solders.. try to get a new one and it will work..

 

I replaced the main relay and after close examination with a magnifying glass I couldn't see any problems with the solder joints on the old relay. I had to wait for some hot weather to test it. Over the last couple of weeks we've had some seriously hot and humid weather - insufferable. Del Sol started every time. Thanks for the help.