Honda

Because of the age of your vehicle, My guess would be that your wiring connectors or grounds are faulty.

Over time connections will oxidize. Find the ground points. disconnect, clean, and reconnect. I would start with the main ground , then the connectors to your fuel pump.

Had a similar problem with an older car. Put a damp to wet cloth over the fuel pump when it is hot. if it does help you may have solved part of your problem. (temporary fix)

Techno and Hendrik, I agree with both of you, but if the car has an alarm, it should also be checked... cause these naughty gadgets love driving us crazy!

My wife has a new VW. Every now and then (mainly after heavy showers) her car started doing crazy things like turning blinkers on and off, locking and unlocking doors, RPM needle jumped from 0 to 7,000; etc.

Several mechanics and electricians checked the car without finding the problem... tired of this I got into the car while my son to sprayed water on the car with the garden hose. After a thorough inspection under the dashboard I found small leak in the sealing of the windshield causing water drops to moisten the motherboard of the alarm.

Problem was solved with some drops of silicone!

Yes you are right - I had an experience with a VW in 1970. The suppressor (capacitor i think) became a dead short when it became warmer. In the morning no problem but in the summer afternoon it was dead. I side cutter eventually did the trick.

All the suggestions above seem good. I'd also recommend checking your spark plugs.

The fact that this problem only occurs during summer seems to hint at some sort of electrical problem since warm air holds more moisture and warm = more noise for electronics.

http://en.wikipedia.org/wiki/Spark_plug

http://honda-tech.com/zeroforum/2 young jedi

sounds like the fuel in your car evaporates out

common on carburettor cars

It is a 'fuel' problem. the variuos controls on the system for temperture are not working. if its an injected engine, check to see the temperature sensors are working AND the EGR valve isnt sticking or stuck open. If its carbeurettor their are various pipes that need to be checked for holes, breaks nd falling off. plus temp switched in the water jackets. But FIRST change THE FUEL FILTER! which may well be buried underbody somwhere along the fuel line.

Good Luck!

I have a very extensive background and many fond memories of the 90-93 honda accords. The issue seems to be related to two very common problems with the vehicle. First the vehicle's PGMFI main relay located under the dash on the drivers side (US Model). The relay is tucked way up near the top of the dash requiring you two settle in an uncomfortable position to remove this relay. The relay is about 2.5in X 1.5in and has a five or six pin connector (I cant remember). the relay body is orange/brown in color and may be obstructed from sight by the cruise control computer if equipped. These relays had a problem when sitting in the sun would not energize the fuel pump.

Next as for the erratic tachometer reading the ignitor located in the distributor could be faulty or as previously mentioned a grounding problem. The grounds that might cause this problem are located on the thermostat housing and should be snugly tightened to the housing via one 10mm bolt. Also check the battery terminals for corrosion and good luck! Any other questions... do the right thing and ask directly to web forums such as these, for the honda tech sites are not always accurate. I apologize to all offended.

continued from my previous post if you have other questions feel free to contact me at

betasqman@hotmail.com

My feeling on this is that it's most likely due to fuel evaporation problems (compounded by a leak perhaps). You don't say where you are, so I can't truely assess whether the problems are likely to persist when you're driving; however, I know my mum experienced a similar problem when driving in the Pyrenees in high summer (evaporation rate compounded by high temp and low atmospheric pressure).

You might like to try this link for further information/ideas: link taking particular note of post #66.

And please: remember to keep us posted on the results of your investigations and the solutions that worked.

Throw that piece of trash into a hole somewhere and get a horse...

Sounds like vapor lock if this car has a Carburetor. Vapor lock occurs when the vapor pressure of the fuel is higher than the surrounding environment. When gasoline overheats and boils inside the carburetor bowl or fuel pump of a hot engine, it ceases to flow. This is called vapor lock, and it usually happens during hot weather. If a hot engine won't start, all you can do is let it sit and cool off. Switching brands of gasoline may also help. See also http://en.wikipedia.org/wiki/Vapour_lock

Your problem is most definitely the Relay mentioned in reply #9.

I have a 1990 Honda Civic, and suffered through that same problem for about 6 months ...gradually getting worse. I changed the fuel filter, fuel pump, Igniter and checked the Fuel Injectors ... al to no avail. Finally the mechanic at the dealer recalled a Honda Memo he read about that Relay.

It so happened that the solder joints crack where the relays are joined to the Pc Board. This is common on most all models of that era. The heat from sitting in the sun expands the board slightly breaking the connection until it cools ...usually because you entered the car and opened a window.

The cracks are very small, and you probably won't be able to see them. You can buy a new Relay Unit, but I suggest that you resolder ALL the contacts, being sure to ADD more solder. Then the unit will be sturdier that the original.

Here are others who have had this same experience:

http://www.nsxprime.com/forums/showthread.php?t=55874

Sounds like incipient fuel line leak or "vapor lock" to me.

Pressure check fuel line.

Check that fuel line, fuel pump, heat shields are not damaged/missing.

Check that a fuel line has not been relocated to a 'hot point`.

I listen to Car Talk on NPR, and

some one called in with this very problem.

They said its likely to be the relay that energizez the fuel pump.

It doesnt pull in during hot weather.

Best wishes with your debug.

Nature's a mutha!