Question about 1991 Honda Accord

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1991 accord. Problems starting when outside temp is warm.

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I've dealt with this sooooo many times. When it's hot inside your car it causes a solder joint on a little circuit board in your Main/Fuel Relay to loose contact. The MAIN RELAY is up above your gas pedal near the cruise control computer. Almost directly behind the dash vent opposite of your coin drawer. It will be a gray or brownish/orange box with a plug of wires connected to it. Use a 10mm socket (with extensions to reach) to move the metal cruise control unit out of the way and tap the Relay, "Plastic Box", while someone tries to start the car. If you can bring it down into better view you can tap it and start the car if you're flexible.

TO FIX THE PROBLEM: Don't buy a new one, just pry the cover off of it with a flat head screwdriver and look close where all the sharp pins are sticking up on the board to find the broken solder connection(s). Heat the faulty pin with a soldering iron until the solder puddles around it and your good to go. The crack in the solder will be smaller than a human hair, look close & wiggle it and you'll see the loose connection. There is usually no need to add solder, what is there is enough, it just needs melted again. Works every time on the Accord, Prelude, Civic and Integra.




Posted on Jun 05, 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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