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Black smoke when reved


 
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Umoren, E.
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Joined: 07 May 2006

PostPosted: Sun May 07, 2006 4:22 pm    Post subject: Black smoke when reved Reply with quote

I just got a fairly used 5.2l 1997 model Grand Cherokee with 178+k miles on it. The truck looks as if it had been parked for sometime without use. Am noticing black smoke when the engine is reved. What is responsible for this or what is the problem? How can I fix this? Am not experiencing any power loss but am not comfotable with the situation.
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swamp boy
Cherokee Muderator
Cherokee Muderator


Joined: 01 Jan 2004
Location: New Orleans LA.

PostPosted: Sun May 07, 2006 5:27 pm    Post subject: Reply with quote

I would start by changing the air filter and disconnecting the battery for 15 minutes... Then reconnect the battery and see how it does.

If you are still having problems check your fuel pressure at the rail..

Black smoke is normally a sign of running to rich. That will happen if either you filter is super dirty and the computer has adjusted and is really dumping fuel..(very likely) Or the fuel pressure regulator is bad and your pressure is to high.. (not likely)

I went wheeling once and the canister that I use for filter housing on my snorkle got under water and had a leak.. It filled with mudd and then when I got out of the mudd we hit some pretty dusty trails to another part of the park and got clogged with dust..

Long story short.. On my way home that night I had huge clouds of smoke behind me and my Jeep felt very weak.. I pulled over changed the filter and reset the computer....

Problem solved...
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RockOn
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Joined: 04 Mar 2006
Location: Murfreesboro, TN

PostPosted: Mon May 08, 2006 5:58 am    Post subject: Reply with quote

sometimes it is just build up from the cat, or burning oil
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cajzmere
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Joined: 19 Jul 2005
Location: Rochester, NY AKA NY Tundra.

PostPosted: Mon May 08, 2006 6:20 pm    Post subject: Reply with quote

There are tons of things that can cause black smoke. Is it really black or more like gray? Oil getting past the piston rings can smoke, exhaust all carboned up, rich running condition like Swampy said........ on and on. Check for rich running by pulling plugs and checking their condition. Do a tuneup, ALL of it, including plugs, wires, fuel filter, air filter, the works! Just because it's cheap, and you don't know if it's been done. Once that's done, you know it's done. Check compression in all cylinders, it's easy and the tool is cheap.
What does the exhaust smell like? Does it smell like gas, or oil, or sweet like coolant? Is it using oil? What's your mileage like? See what I mean? Checking all these things will more than likely lead to your problem. Good Luck.
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telam
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Joined: 06 Oct 2004
Location: Atlanta, Ga

PostPosted: Sat May 13, 2006 7:47 pm    Post subject: Reply with quote

Mines got 150k on the clock, It eats oil some. I only have smoke when I really stp into it or if there is a major temp change from night to morning. Once it warms up it goes away. I'm gonna drive it till it blows then replace it. I love my 318!!!!!!!!!!!! It's eat'in oil and still has power for days!!!!!!!!!
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