Question about 1992 Honda Accord

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Car won't start when it's hot outside

My 1991 honda accord will not start when it's hot outside. I've been working on this problem for about 2 months now. I have replaced the engine coil, distributor cap, button inside distributor cap, spark plugs, spark plug wires(2 times). I have checked the battery and it has a good charge, the timing belt squeeks but stops after about 5 seconds. In the past 2 days the light underneath the temp guage with a big "S" on it blinks for about 3 seconds. However after the inside of the car cools down the car will start after a couple of cranks. I really don't know what to do. Does anyone have any suggestions?

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  • Keith Heavilin
    Keith Heavilin May 11, 2010

    You didn't really say anything about the starter.  Is it turning over but won't start?

  • Isiah brown May 23, 2013

    yes it turing over and my thief light blinks real fast

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My daughter's 1991 Honda Accord did the same thing. I discovered that the main relay had to be replaced. Apparently the solder used in the original main relay was poor and would actually "soften" in the heat and cause a disconnection. When the cabin temperature dropped, the solder would cool and reconnect. Anyway, replacing the main relay worked. My daughter's car has not had this problem since.

Posted on Jul 10, 2009

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There is a relay box located up underneath the driver's side dash. It is a small box, about 1" wide by 2" length by 1" depth. Go to this link for a picture and location: http://techauto.te.funpic.org/mainrelaydefine.php

Unfortunately, it is a little spendy, but should do the trick. My stepdad has a 91 Accord, and his would do the same thing: not start in the heat, and you'd have to wait for it to cool down. One day, mine (a 92 Accord Coupe) wouldn't start when it was about 90 some degrees out. Luckily I have a mechanic friend who is a genius and knew right away what the problem was (probably becuase he already had to figure it out on my stepdad's car).

Anyway, the relay can get hot enough to where the circuitry is fried. Simply replace the relay and you should be home free.

Posted on Jun 19, 2009

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My 91 Honda Accord does the same thing without running. It can be setting parked for hours and it will not start until the inside temperature cools below 85.
I will indeed be checking the main relay and trying the solder repair solution found on the link posted jordantanass. Thank you!

Posted on Jun 26, 2009

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Where is the location of the main relay in the car of a 94 Honda Accord LX? Please notify at clj4jesus@yahoo.com

Posted on Apr 19, 2010

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I had this problem and Corrected it by re soldered the main relay and Viola never again well with this problem. A 50 cent fix.

Posted on Jul 17, 2009

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Yes, I would suggest you change your engine coolant temperature sensor and clean the mass airflow sensor.

Posted on May 26, 2009

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Do a combustion leak test ,for head gasket test.

Posted on Mar 10, 2015

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Yes you can fix the problem by re-soldering the contacts .on the fuel pump relay

Posted on Nov 01, 2014

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I think this problem has been resolved in the previous answers. Typically is your main ignition relay. The location has been given in the previous answers as well. If you have some experience like kimandblue all you need to do is re-solder it.

Posted on Aug 03, 2014

  • I believe 91 accords don't have crank sensors. If you want to accept it as it is that is your choice but it can be corrected.

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This is not really a solution but I've had a similar problem with my 1992 Honda Accord. Occasionally it simply won't start when it's hot out or if the engine is warmer than usual because of driving uphill, etc. I simply wait a little while (never more than 5 minutes, usually only 1 or 2 minutes) and it fires right up. This has been going on for the four years that I've owned this car and I've just come to accept it as an idiosyncrasy of this model car. I have 155,000 miles on it and it runs great other than this little glitch.

Posted on Jun 05, 2009

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I have experienced it lately, after weeks of tracing what is the problem, i have come out with the solution...
first my car wont crank, just a clicking sound, the clicking sound by the way was from the ignition switch relay...
i checked my battery, battery terminals, distributor, starter, starter solenoid, ignition fuse and wirings and they are all good.... and end up with my "ignition key switch"
my ignition key switch when fully turned to start cannot make it to reach the contact point to make the car start, as we all know, plastic when exposed to heat softens... and our starter key switch is plastic in the inside, what i did is to adjust its position so that when i turn it on and start, it would reach the contact point where the car stars :)

hope this helps :)

Posted on Apr 24, 2013

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Posted on Jan 02, 2017

  • 369 Answers

SOURCE: 1991 Accord LX. Won't start. Checked timing,

Probably your crankshaft sensor

Posted on Jan 10, 2010

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I had a problem with a 1991 Honda Accord and the fix was a weird one. My car would run fine and start fine if it was cold outside. If I left my car in the sun and the interior got hot, my car wouldn't start.

(Since you drove to San Diego this may be the problem)

I found out that if I left my windows open and let the inside of the car cool down, it would start. Strange.....

Apparently, there is a main relay box under the steering wheel that triggers the starter motor and fuel injection. In the Honda's made around 1991, the contacts in that box would expand and would not let the electricity flow.

I guess you can repair the relay box, but replacing it might be a better bet ($50). I took my car to three different mechanics before any of them had heard of this problem.

The fix was simple, but the problem was hard to diagnose.

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