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Old 02-15-2011, 06:14 PM   #1
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Battery/Altenator and fuel issue

Battery/Altenator issue: My battery died (I think). I can jump it off and drive it forever, but it is not holding a charge. While its running my voltage meter jumps up to 19. Is this a battery issue or altenator?

Feul issue: So I filled my tank yesterday and while driving, there was a bad gas smell (my wife could smell it driving behind me). I used the full tank and only drove around 150 highway miles. This is crazy. Any opinions?

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Old 02-15-2011, 06:23 PM   #2
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Seems like you have a fuel leak somewhere on the jeep. Check the lines to make sure they aren't corroded and rusted through. Also check the connection between the filler neck and the tank. If your volt meter is jumping like that it could be the regulator for the alternator. Depending on what year jeep you have the volt regulator will either be in the computer or in the alternator itself. As for the battery, you can buy an acid test for it at a parts store or you might be able to take the whole battery there and have them test it.

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Old 02-15-2011, 06:31 PM   #3
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Seems like you have a fuel leak somewhere on the jeep. Check the lines to make sure they aren't corroded and rusted through. Also check the connection between the filler neck and the tank. If your volt meter is jumping like that it could be the regulator for the alternator. Depending on what year jeep you have the volt regulator will either be in the computer or in the alternator itself. As for the battery, you can buy an acid test for it at a parts store or you might be able to take the whole battery there and have them test it.
Cool, I will check that tomorrow, but I forgot to mention that there is black dust coming from the tailpipe, sometimes with a little liquid mixed in.
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Old 02-15-2011, 06:39 PM   #4
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Ahh, that helps a bit. Black smoke coming out of the exhaust it the result of the motor running lean, too much fuel in the cylinders. The engine isn’t able to burn it off before it exits the engine. As for the causes, it could be a number of things. If you have an older jeep with a carb it might not be adjusted right. It could be the fuel pump, bad or leaky injector, a bad sensor, or the computer. I would take it to a shop to make sure, but you don’t want to drive like that for too long. Also make sure to check your oil to make sure that the gas hasn’t contaminated it in anyway.
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Old 02-15-2011, 07:27 PM   #5
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A bad 02 sensor can cause an engine to run way too rich, and you can definitely smell the gasoline from that situation.

Regarding the battery, do two things... remove both battery connections and wire brush them until the battery posts and connectors are bright and shiney clean. Then reinstall the connectors and tighten their nuts tight. Now see if the connector is tight. A worn connector can be moved even with the nut as tight as it can go. A dirty or loose connector can cause the voltage to spike as well as cause starting issues. Next, take the battery into an auto parts store or battery shop and ask them to "load test" it. That is the only way to tell the battery's true health.
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Old 02-15-2011, 07:53 PM   #6
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A bad 02 sensor can cause an engine to run way too rich, and you can definitely smell the gasoline from that situation.

Regarding the battery, do two things... remove both battery connections and wire brush them until the battery posts and connectors are bright and shiney clean. Then reinstall the connectors and tighten their nuts tight. Now see if the connector is tight. A worn connector can be moved even with the nut as tight as it can go. A dirty or loose connector can cause the voltage to spike as well as cause starting issues. Next, take the battery into an auto parts store or battery shop and ask them to "load test" it. That is the only way to tell the battery's true health.
Thanks Jerry. I was looking at the 02 sensor online for pricing and it was showing a down-stream and up-stream. Is this correct or was I looking at the wrong thing?
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Old 02-15-2011, 08:00 PM   #7
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Yes, there are upstream (nearest to the engine) and downstream (usually on the far side of the catalytic converter) 02 sensors. Typically it is a defective upstream 02 sensor that is the most likely to cause a fuel mixture ratio problem.
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Old 02-16-2011, 07:00 PM   #8
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UPDATE:

SO I had the battery tested at Autozone. It registered as good but needing a charge. So I guess it must be the altenator. I jumped it off again and the amps jumped back up to 19. Any other ideas of what it might be?
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Old 02-17-2011, 02:02 PM   #9
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UPDATE:

SO I had the battery tested at Autozone. It registered as good but needing a charge. So I guess it must be the altenator. I jumped it off again and the amps jumped back up to 19. Any other ideas of what it might be?
didn't A/Z check the charging ? buy a VOM it will be your best friend
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Old 02-17-2011, 03:16 PM   #10
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Just like hookuspookus said, get a volt meter and check the battery voltage with the vehicle off. Start your Jeep up and check the battery voltage again with it running. If the battery voltage did not increase after starting the Jeep then you have a problem with your alternator.
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Old 02-19-2011, 04:31 AM   #11
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19 volts is a no - no

Quote:
Originally Posted by derrick.edwards2 View Post
Battery/Altenator issue: My battery died (I think). I can jump it off and drive it forever, but it is not holding a charge. While its running my voltage meter jumps up to 19. Is this a battery issue or altenator?

Feul issue: So I filled my tank yesterday and while driving, there was a bad gas smell (my wife could smell it driving behind me). I used the full tank and only drove around 150 highway miles. This is crazy. Any opinions?
if you use a VOM and your getting a 19 volt reading you have a bad voltage regulator , DO NOT DRIVE THIS UNTIL IT IS FIXED you will burn out your ECM ,your radio and other electronics ,if it dosn't give you a 19 v reading bad volt meter in your dash
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Old 02-20-2011, 06:49 PM   #12
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check your ground connections from batt to engine and to body making sure all are clean and tight
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Old 02-20-2011, 06:56 PM   #13
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correct me if im wrong somebody, but if he is having a charging issue would that not send the ecm into an open loop (default), which could be his lean out condition?
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Old 02-20-2011, 07:19 PM   #14
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black exhaust indicates rich mixture and 19 volts indicates full fielded alternator so i would be looking at grounds
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Old 12-18-2011, 03:45 PM   #15
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Unhappy battery gauge spikes past 19

Ok I'm having a similar problem... A few weeks ago my 97 wrangler died on me. Thinking it was the battery I bought a new one, only to find out it was my alternator. Went to auto zone had alternator tested and it was bad so I replaced that too. Here is what is still going on.... Jeep idols rough, on the low side, and battery gauge spikes past 19. When I shut the jeep off and try to restart it nothing happens... after the jeep has set for a few min it will start back up and the volt meter reads 14, this just keeps happening. Is it bad to drive it like this? Someone said it might be my ECM... can anybody help??
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Old 12-18-2011, 03:51 PM   #16
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Check your battery connections, are they clean and tight enough that you cannot move them around on the posts by pushing/rotating them with your hand?
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Old 12-18-2011, 03:54 PM   #17
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Yeah Battery connections are tight... I forgot to mention that my stereo wont remember any of my stations and while the jeep is running if I turn on stereo, heater full blast, headlights, and KC's the Jeep dies...
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Old 12-18-2011, 04:00 PM   #18
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You've got a bad connection somewhere... your battery and alternator are both new but your sterero, heater, etc. are drawing more power than one of the connections can pass which will indeed cause the engine to die.

Though you think all the connections are good, I'd go back and revisit them and don't forget to check things like the ground connection between the battery and chassis, and between the engine and the Jeep.
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Old 12-18-2011, 04:25 PM   #19
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There is some corrosion on the positive wires going to the battery... gonna try replacing terminal clamp on cutting back the red wires to make a clean connection... hopefully this is the issue?
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Old 12-18-2011, 06:58 PM   #20
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Here is what I've found so far.....

When looking at the battery I notice corrosion on the positive connector, went and bought a new clamp. Cut off corrosion and put a cleaner on it, reassembled. I checked connections around the motor to discover that a bonding strap or "ground" that goes from the hood to the firewall to the engine was broken off. I am assuming this is the problem but I don't currently have a socket that will allow me to remove the nut so to Menards I go! Could my problem really be this simple of a fix???
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Old 12-18-2011, 06:59 PM   #21
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I checked connections around the motor to discover that a bonding strap or "ground" that goes from the hood to the firewall to the engine was broken off.
That strap only serves to ground the hood which helps keep ignition static confined to the engine compartment to help keep it from interfering with the AM (or CB) radio.
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Old 12-18-2011, 07:06 PM   #22
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Hmmmm so you don't think thats it? Shoot! What else could it be?
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Old 12-18-2011, 07:16 PM   #23
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Where else does the engine ground to the firewall?

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