Hey guys i have a 94 accord and it is having trouble starting whenever it is hot outside or restarting when it's been driven for a while.

When I go to start the car I'll turn it to where all the lights on the cluster go on, and if it's hot outside the D4 light on the cluster will blink and the car will crank but never start, then after a while of waiting I turn the key and the D4 light will come on like normal like all the other warning lights, but it will shut off and a click sounds with it and then the car will start.

The only thing I can think of is that maybe it's the electrical ignition switch or a fuel pump or filter? Have any of you guys experienced this blinking D4 light?

 

Watch the Check Engine Light. If when you first turn the key to "on" the check engine light comes on for a few seconds then goes out you should hear a click from behind the dash near the drivers left knee. If the check engine light comes on and goes out but you dont hear a click, I suspect the main relay. Does this help?

 

I agree with ^^^, it can be the main relay. Here is an excerpt from the following link:

Problem: My 90-94 Accord (and some Acura Integra) takes off real slow and won't shift properly, usually happens with a no start. The "S" (D4) light is also blinking, can this caused by the main relay?

Yes. This can happen when the ignition is ON and the ECU/TCU power supply from the main relay drops out momentarily. This could happen in conjunction with a no start condition. The symptoms will usually cause the transmission to shift into the wrong gears (such as 4th.) Instead of 1st, they take off in 2nd, 3rd or 4th gear. This can happen for several different reasons, caused by either internal transmission problems, or external control system problems. External control systems can also cause wrong gear starts.

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