[Shotimes] Heat-related electrical problem?

[Brian E. Harris]

Hi all...

My '93 ATX has developed a goofy issue.

When the weather has gotten really warm of late, the car doesn't want to give
any power to the fuel pump.

I had this issue (minus the heat-relatedness.  It happened regardless of the
outside temp) a couple summers ago, and my mechanic had tracked it down to the
ICRM/IRCM module (the big relay the bolts to the driver's side front support
near the radiator).

Well, this started happening again this summer, and I put in another module
(used, from wrecking yard).  Didn't seem to make any effect.

The first time I replaced this module, it had stopped working, period.

This time, it only happens in the hot afternoon/evening.

For example, I went to a movie last night at 5pm - car got me to theater just
fine.  Parked in the sun.  2 hours later, I come out, still having that
issue.

Went to dinner with a buddy in his car, went around town, came back to my car
at about 9:45.  Still won't start.

Had him leave me at my car, would either tow it home, or it would start.

At 10:30, called tow company.  At 11:00, tow truck arrives, and my car starts
before the truck trys to hook up.

Drove home just fine.  Starts this morning.

I'm not absolutely convinced that it's the ICRM.  I don't think it's the fuel
pump, however, because I just had that replaced about 3 months ago.

Any other ideas?

Now, I'm not saying that this module couldn't be bad as well, but,