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Go Back > Models > Jeep Grand Cherokee & Commander Forums > WJ Grand Cherokee Forum > Rough idle black smoke

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Unread 05-12-2014, 11:55 PM   #16
Registered User
Join Date: Oct 2012
Posts: 353
with all due respect you didnt need a scanner, the WJ reads and displays its own codes with the 3 key trick

with that said, I would use a multimeter and test for continuity on the injector harness.

test things before buying parts to throw at it...

also did you read my previous post?

Did you rent a compression checker?....

2001 WJ Limited NV247 4.7
2008 KK Limited MP253 3.7
2008 WK Limited NV245 3.0 CRD
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Unread 08-18-2014, 03:18 PM   #17
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2001 XJ Cherokee 
Join Date: May 2014
Location: New York, New York
Posts: 2
I have a 2001 4.0 6 cylinder with about 140,000 miles (original owner). I get multiple misfire codes and occasional power loss when under strain (pulling a full load) or with 4 adults inside headed up an incline. Flashing check engine light (worried about catalytic converter) and gas rich smell; exhaust spits out black. I changed the condenser pack, checked vacuum lines, changed spark plugs and changed oil. Runs fine in the city but on highway with load problem re-appears. Thought it might be timing chain - any help appreciated.
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