20 Most Recent 1993 Honda Civic 4 Door - Page 7 Questions & Answers

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. It will be a gray or black box with a plug of wires connected to it. Use a 10mm socket (with extensions to reach). Bring it into view 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.

cheapest thing to do is call around to junkyards, or look them up on the web, until you find a used honda head which matches your engine. the junkyard will know what will match. try and find about the same mileage. get yourself a repair manual on CD for about 5 bucks on eBay, a new head gasket kit, case of beer, good tool selection, well lighted garage, and you are good to go.

1. replace your spark plugs
2. are your still running on carburetor? if yes, have it cleaned and check if the air/fuel ratio is correct.

First off you need to be for sure that it is a fuel related problem before you start to go and change any more parts out. An engine needs 2 things to start/run that is fuel and spark to your spark plugs. When the engine will not start do some test as to see what is not happening and go from there. A couple of questions and one is, is your vehicle fuel injected. I ask because depending where your vehicle was built in and around that year they were both. If it is fuel injected does it seem to only start when the temprture is cooler outside. I know that sounds strange but I have been in this business for a long time and Honda in thier fuel injected models had a relay called the PGMFI relay. In a number of cases I have found these relays to go bad and when they started, when it was hot outside the vehicle wouldn't start until the temp cooled down out side. Odd I know but it is common in that time era for Honda's. If it's not F.I. then I just wasted your time reading but thought I would throw that out. If you have any questions feel free to email me at [email protected] and I will do my best to answer it for you. Best bet is to find out where the problem is and narrow it down from there. I hope this helps a little anyway but had to say something before you kept buying parts for nothing. Good luck.

that is a muffler shop where they get paid commissions based on parts sold. go to a real mechanic, he should be able to quickly identify whether you have a fuel supply OR spark problem so as to minimize replacing good parts and head scratching! fuel pressure can be tested, so can fuel pumps.

did you replace the distributor? did you check the ignition timing after the replacement?

replace the voltage regulator

You'll need to do a compression test to see if that dead hole is damaged. Hondas had problems with burnt exhaust valves and I wouldn't be too surprised if that's your problem. However, it is possible that the compression is good, if so, and if you have spark, you may have a bad injector on the cylinder.

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The black box can be the aftermarket security system.

Hope this helps and thank you for using FixYa! Have a good one!

The pcv(positive crankcase ventilation) valve ventilates explosive gasses from the crankcase so the engine does not blow up, literally, like a bomb.

you could ha e a leak in your ac system. listen while your car is running with the ac turned to full blast and see if you hear the compressor cycling on and off. if you dont, hook up a set of ac pressure gauges and see if there is any pressure on the system. if nothing else try adding a can of refridgerant into the system. if unsure how to do so take it to an auto parts store and they can show you where you need to add the refridgerant and probably do it for you.

go to scrapyard and take one off their then you will know how to fit it to your car .

the basics are fuel air and spark, so check for spark by removing a plug wire and laying it on your engine close to bare metal and crank it , you should hear a nice snapping noise, if you have spark then youll need to go over the fuel system, there is an inertia switch located in the trunk i believe

Go to a auto zone or any parts store. I found mine at
auto zone. My book for my 93 honda civic coup was around $25.