1998 Grand Cherokee V6 - Smoke When Battery Cable Disconnected With Engine Running


Jul 8, 2013

I replaced a battery on a 1998 jeep grand Cherokee v6. It started and ran fine, but then in my infinite wisdom, I decided to remove the negative battery cable with the engine running to test the alternator. Some smoke started coming from the back of the engine, so I immediately killed it. It wasn't running for more than 5 seconds. When I started it again, it faltered, but the second time it started fine and ran fine, a little more smoke came out but stopped soon. it smelled like burning oil. We drove it around the block with no problems. I know it wasn't the alternator that was smoking because that's not where it was coming from, and I doubt it was the ecu because then it wouldn't run.

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What is reverse polarity and what did they do to the car that damaged the control system?

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After a few days, the coolant reservoir was low again. On my way home one night I noticed an engine knock that sped up and slowed down with the RPM's but didnt get louder or quieter. Fortunately, the next day the Passlock system kicked in and I havent been able to start my car in a week.

I finally figured out the passlock issue (BCM was getting water in it from somewhere, cleaned off the connector pins and it started right up! found that fix somewhere on AF)

I changed the oil and the engine knock is still there. Now its a little more prominent and the engine was shaking tonight. Took out the spark plugs and they look and smell like they have oil on them. From what I've read so far it seems like it could be a valve cover gasket and/or the head gasket.

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1996 Jeep Grand Cherokee 4L

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It has been in the shop for most of the last 2 months. Driven in 3 times and hauled in twice.

Low mileage 70,000 - has been great until now - serviced regularly.

Did get new fuel pump only about 10,000 miles ago do to starting problem but in that case it just did not start.

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We replaced gas cap just in case.

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