Hyundai S Coupe Problems: Alternator - Fuel Pump - Faltering Engine fix

I recently bought a second hand surplus Hyundai Coupe 1993 model last December 15, 2011 here in the Philippines. Its a 12 valve engine. After sometime of using it, I have encountered a couple of problems which are; alternator not charging, 4th cylinder not firing, fuel pump leaked, and faltering during acceleration (palyado).

After 3 weeks of acquiring the car and learning to drive, the first problem that I've encountered was the battery that keeps discharging and so I could not start the car without jump starting it. I had to stop a kind motorist to help jump start the car. It's been like for a week until I had it checked with the mechanic. He found out that the 4th cylinder has a problem too.  Checked by removing the high tension wire from the 4th spark plugs. He assume that the cylinder is not firing. But for the time being he told me to have check the wiring first and the alternator to the car electrician which I did so.

The car electrician found out that the alternator of the Hyundai scoupe 1993 is not charging enough to the battery. They repaired and fixed the problem. A alternator brass copper was replaced and soldered. This time I don't have any problem on starting up for the entire 3 weeks.

Later sometime I brought my car back to the mechanic and see if he could fix the 4th cylinder that were not firing. He removed the spark plugs then noticed that it was wet. He replaced the spark plug with a new one but unfortunately it does not solve the problem. The mechanic also check if the engine valves in the 4th cyclinder. He suspects it must be leaking that causes the spark plug to get wet with oil. To make sure it wouldn't, he dismantled the top portion of the engine then remove the valves, grind the surface and replaced old engine valve seals. The latter was quite a bit hard to find for a new replacement, luckily I was able to buy at Kapitan auto store at Borromeo Cebu City.

Now that his able to put back everything, the moment of truth has come to see if the 4th cylinder of the hyundai s coupe will fire. But unfortunately it didn't solve the problem. However the mechanic was able to find the main culprit that causing my car to falter during acceleration, its the Fuel Pump inside the fuel tank. The Fuel Pump were leaking huge amounts of gasoline thus will causing not enough fuel to pump. He replaced the pump, this fix the faltering problem during acceleration.

The mechanic then ask me to take my car to the car electronic shop to check my Hyundai s coupe ECU or other electronic parts which is causing the 4th cylinder not to fire. He suspects fuel injector is not tune to inject at the specific time. It could be late, injecting not enough fuel or clogged up.

I brought the car to the shop and the guy check the fuel injector if its firing enough. He found out that the injector is not firing enough fuel. It maybe clogged up a bit. He may have to clean it or I have to look for the exact Hyundai s coupe 1993 fuel injector set. This can be costly. Just take a look at the video of how the fuel injectors fire intermittently.

A few days after, he removed the fuel pipe that was attached to the fuel rail and noticed a whitish liquid that spills out instead of pure gasoline. He concluded that the fuel tank might be filled with other liquid instead of pure gasoline. His conclusion was right, after draining out the liquids inside the fuel tank. This is what we found.

Fuel sits at top portion while the other liquids sits below.

All of the impurities were removed and we fueled it with 100 percent gasoline. At last this time I wouldn't have trouble on starting up the engine which has been one of the problems that I've been having with my Hyundai coupe car.  Now I know why I have to wait for a couple of minutes to start it up that's because the water needs to sit below the liquids because it's more denser compared to gasoline. This car engine start up problem were now solved. The thing that bothers me though is that where on earth did other liquids is coming from? Questions has raised discrepancy with gasoline stations. Could they have mixed water and gasoline to their tank? What's the white liquid? Motorists should beware of this.

Continue to the fuel injector problem which injects a little amount of fuel might be cause by the impurities of the liquid. However the mechanic had to open up the top portion of the engine and clean the white substance that sticks inside the engine cover. If we haven't found that water and other liquids inside the tank, it might cause severe damage to the car engine. This could be harder to fix. 

The fuel injector is now injecting perfectly after tedious clean up from the fuel tank to the engine. Compare this to the previous injection of the fuel injector, you'll definitely see a very noticeable difference.  

Now that the fuel injector is firing perfectly, its time to check if the 4th cylinder will show combustion which I hope it will. But unfortunately again, it fails. These has lead us to the other culprit suspect which might be the ECU (Engine Control Unit) or the car computer box. ECU reset might able to help but we're not certain since we haven't tested it yet. However an ECU expert repair guy that I've talked on the phone told me that it may have something to do with it. ECU repair here is not expensive, it cost only 400 -900 pesos. If they think this is the resolution then I would definitely take the computer box to their shop. I will soon post the result here. So subscribe and stay tune.

Posted in: hyundai check engine,hyundai coupe ecu fix,hyundai ecu repair,hyundai s coupe 1993,hyundai s coupe 1993 reset ecu