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Engine surging - Hyundai Lantra 1.6 GLSI auto est. 1997

Had new alternator fitted and engine began surging and battery boiling - fumes from battery leaking in to car. ? faulty alternator . Replaced alternator but engind still surging when idling and driving. any idears what it might be?
Can faulty alt damage ECU?

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The battery boiling is a result of the internal voltage regulator in the alternator overcharging the battery. Was it bulged out at the sides also? If the regulator was bad it may have overloaded some of the other electrical systems. It is possible something in the ignition system has been burnt out. I don't think the ECU is bad, as It should have plenty of safeties, like fuses, protecting it. Anything is possible, though, but a bad coil(s) could be burnt, thus giving you the bad idle, the computer is trying to compensate the fuel injection. A plug in with an engine diagnostic machine should tell. If you had a company install the alternator, I would make them give me a new battery and what ever else is bad. If you did this yourself, have a mechanic check it out, and send the estimate to whomever supplied the alternator. You can remove the spark plugs one at a time, leave the wire connected and start the car, see if they are sparking. This will tell you if the plugs are firing, and go from there.

Posted on Jan 07, 2008

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A faulty alternator could damage the ECU, in theory. I won't say for sure that it has. However, if the alternator is giving out too much power, it could be overcharging the battery. The easiest way to check this is to put a voltmeter across the battery terminals while the car is running. If it reads 15 or higher, you are overcharging.

As to why it's overcharging, it could be a bad alternator. But with the way the engine is revving it sounds like you may be getting a bad voltage read on the electrical system. The ECU thinks there isn't enough voltage, so it sends more fuel to rev the engine and thus cause the alternator to create more power, which boils the battery.

-Dyllan

Posted on Jan 07, 2008

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You need to check out your voltage and charge regulator. Some are built into the car, and some are external. Check your fuse and relay boxes under the hood for anything blown. You are is not regulating the charge your alternator produces. Whoever installed the alternator is responsible for the charge function working. If you took it to a mechanic then they are supposed to finish the job. Otherwise go to your local auto parts store. Ask them too look up a voltage regulator for your model. Some people don't know how to use that system so go a couple of places to make sure you find someone who can really find your part. When you find the part you can either replace it (recommended) or use a OHM meter to test resistance on both new and old one. If the values are different, then replace the regulator. Let me know if anything in this car is much different than that.

Posted on Jan 07, 2008

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