I have the same Honda Accord 1998 V6. It does not start on hot days. I used to change the ECU, but it does NOT help, do not listen to any suggestions, just change your Main Relay!!! if your honda does not start on a hot day. I changed it and it is running perfect. You may change it by yourself, it is quite easy. The new one costs about $60.
I have a '98 ex-l and my car did this yesterday. there is a plug connecting your starter to the engine. the plug is located on the right side of your motor's cover (big, silver and black thing say's honda v-6 or something like that). unplug and replug this. should crank fine after that.
This happens a lot to 6 gen accords. there is a chip right under your steering wheel, i don't know what it is call but it is about the size of a deck of cards. all you do is unplug and pry it open with screw driver, careful not to damage the casing to much since its plastic. take a look at the soldering on the back of the chip. if it is crack or brown, meaning damaged or burn due to cheap manufacturing. go to your honda dealership and get a new one and replace it. it will cost you about $50 to $60.
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-There are couple thing that cause not to start:
*Before check the following, make sure battery is full of charge.
1. No thing at all. Possible Corrosion battery cable or bad connector or starter relay. (Visual Inspect it) Clean it or tight it
2.Click but never turn or start. Starter has dirty contact or worn out. (Replace W/new one)
that would depend. if its the main relay, it would drive normally, but then if you park and turn your car off. when you go to start it again immediately after, it wont. but if it cools a couple of minutes, it will. can you give a little bit more detail on what exactly does it do? like turn over, doesn't turn over? starts and dies? would like to help. goodluck
There is a possibility of a condition called "Vapor Lock" in which on hot temperatures, air bubbles form inside the fuel line, and dont allow the fuel to reach the injectors. One the line cools down, the vapor goes away, and car starts uneventfully. Have the fuel lines checked for leaks or abnormalities. The other possibility is that the EFI (Electronic Fuel Injection) relay or computer unit is acting up. These units usually start to fail when hot, and work normally after the engine compartment cools down.
If it happens primarily in hot weather (i.e. inner temp of car is over 100 degrees after returning when parked), I'd definitely replace the main relay located under the dash on the driver's side (waaaay up under the dash). It's a $55 part from Honda that plugs directly in to the existing harness. Unplug the old, plug in the new. I'd bet a paycheck that this would fix your problem (if it mainly happens in hot weather).
May be, Your coolant machine is working too hard.. Because when hot/summer day , if my machine in long journey , and you resting your car , the fan sound is still on although you turn off your machine.. It's means, the coolant machine , or your engine component must be changed... I hope so.