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Unread 04-14-2008, 09:12 PM   #1
blamejane2
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1995 YJ Wrangler 
 
Join Date: Oct 2007
Location: Montana
Posts: 89
tried jumping the battery and saw smoke

I'm hoping this is not going to hurt much, but...

I had a dead battery after leaving my lights on all day. I then tried jumping my jeep with my our dodge 3500 diesel. Next thing I see is smoke from the driver's side firewall. Immediately disconnected the jumper cables.

Then tried jumping it with our 92 f250, which did charge the battery (without smoke) but the engine wont start. I cranks but nothing more.

Also, I can't get any engine codes. After the sequence of on-off's I get a steady engine light.

Any ideas?

Valerie

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Unread 04-14-2008, 09:14 PM   #2
Brandon_YJ
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1987 YJ Wrangler 
 
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Location: Metro Detroit
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Fried computer or something similar? (not up to par on computer controlled vehicles)
Please tell me you had the cables connected correctly, and not pos->pos / neg->neg
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Unread 04-14-2008, 09:22 PM   #3
blamejane2
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yeah cables were fine...

It seems so close to starting, but I'm guessing my PCM is now fried. I don't get why this would happen.
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Unread 04-14-2008, 09:28 PM   #4
provinT13
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This happened when this girl was trying to jump her XJ in the parking lot. Her idiot boyfriend put the cables on the wrong ends and the batteries of both cars started to smoke, luckily no damage was done.
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Unread 04-14-2008, 09:44 PM   #5
blamejane2
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the smoke definitely occured where the PCM is located, I'm just hoping that it won't need to be replaced. Anyone got experience replacing this? What about cost?
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Unread 08-14-2009, 08:00 PM   #6
92yjwrangler
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same symptoms!! it like cranks and cranks but no start
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Unread 11-05-2011, 09:40 AM   #7
kriv
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Just had this happen to me.
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Unread 11-05-2011, 09:44 AM   #8
77_waggy
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Changing the PCM is not hard but they are not cheap. Call the dealer for a price and also try a local junk yard. By the way is there a fuse box where the smoke came from?
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Unread 11-05-2011, 10:09 AM   #9
kriv
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There is not a fuse box in the engine compartment. There is a fusebox that matches up with it on the interior of the car.
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Unread 11-05-2011, 11:47 AM   #10
bkn1971
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1995 YJ Wrangler 
 
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A guy I worked with had the the same symptoms with his jeep and had a shop change his PCM and after about a month of messing with it the shop told him they no longer wanted to work on it so he had it towed home and started going thru the wiring leading to the PCM all it was for him was a corroded connection. I would check the fuses and the wiring in the area of the smoke before buying a new PCM.
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Unread 11-05-2011, 11:54 AM   #11
kriv
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Thanks bkn.
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Unread 12-29-2011, 12:26 PM   #12
kriv
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So I replaced the battery and 4 fuses that were blown out, traced the electrical, but couldnt find any more issues. That doesn't mean they aren't there, just that I couldn't find them. The jeep still will not start, but at least it isnt completely dead anymore. I guess it is time to order that pcm.
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Unread 12-29-2011, 01:36 PM   #13
jmmorgan82
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Had the same smoke issue happen to me. My no-start condition was caused by some pretty bad cables. After replacing those, it started right up and even though there was smoke, my Heep has had no issues.
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Unread 12-29-2011, 02:41 PM   #14
Reddy89
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Disconnect your battery for several minutes, this will make the computer reset, reconnect it and try to start it.
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Unread 12-30-2011, 04:32 PM   #15
JWELK
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I've seen them on ebay for 40 bucks.
Trust me, you are not the first, nor will you be the last. For the future, red jumpers to the battery and the blacks to the engine block and NOT the battery. If you get large sparks, check your connections and you will just damage the cables and nothing else.

Regards,

Jim W
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