Question about 1997 Jeep Grand Cherokee

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My 1996 Grand Cherokee 4.0 is running very rich and emitting black smoke at times usually around 2000 Rpm I changed the wires, plugs and temp sensor and that didn't help.

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02 sensors will need to be replaced

Posted on Nov 12, 2009

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It sounds like you might have a misfire that is causing the engine to run rich, hence the sputtering and black smoke. When is the last time that you replaced the spark plug wires and the spark plugs? If the 1996 plug wires are like the 1997 plug wires used on the 4.3L S-10, they can be pretty difficult to get a reliable connection at the distributor cap.

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Nov 23, 2015 | 1996 Jeep Grand Cherokee

1 Answer

Black smoke while pickup from low rpm.


black smoke generally indicates the engine is running rich (too much fuel) this could be caused by a number of things, I would start by changing the air filter and running some quality fuel system cleaner.

if that doesn't help then you might have a faulty injector(s) or it could be in need of spark plugs and plug wires. there are quite a few problems that could cause this, even something as simple as a coolant temp sensor being faulty.

hope this helps

May 24, 2011 | Toyota Land Cruiser Cars & Trucks

1 Answer

Grand Cherokee Laredo 1996 emits a lot of black smoke on take off or when overtaking, and when coming to a stop nearly stalls. Has terrible fuel economy. Injectors have been serviced, oxy sensors and plugs...


this vehicle is running well rich from the sound of it so it could any one of a number of things from a choked up air filter to a intake pipe collapsing inside the pipe .then it could be the control for the injectors so again anything from the mass air flow sensor in the air intake pipe to a faulty ECU computer .The only way to be sure to locate the fault is to ask dealer with more specialist diagnostic equipment than just a code reader ,they will be able to read the whole engine management system which you cannot do with a code reader or a scan soft type programme

Jan 27, 2011 | 1996 Jeep Grand Cherokee

1 Answer

93 jeep grand cherokee. Starts and idles ok.


Being injected, the control system varies fuel quantity and does not directly regulate air flow. Therefore, having black soot on plugs tells you that there is too much fuel going into the engine. The O2 sensor tends to react to, more than control that. Missing can be the result of plug fouling. Backfire may be the result of a too rich fuel mix permitting unburned fuel to enter the hot exhaust where it re-ignites.
Where I would look first in your case is to the manifold air temp sending unit and the coolant temp sender as well. If either or both are out of range the computer may "think" it is running a cold engine and therefore adding additional fuel for cold start up,and not switching to normal run mode when the engine reaches operating temp. Once the plugs foul the engine will continue to run poorly regardless of other conditions. You can test each component individually using either chilton or haynes manual as a guide. You will need a decent digital multi-meter to do the tests.
You can also have a code test done at most major parts stores, but often if sensors are not bad enough to set a code but together are causing a problem, you may not see anything except the O2 sensor.
There are other possible causes such as worn out injectors, but most often that won't happen in all cylinders at the same time. Do testing first, correct whatever you find and then make sure plugs are clean. If after running, the O2 sensor continues to register a fault, then replace it.
Good luck...any further questions are welcome and don't forget to rate answers!!!

Feb 22, 2010 | 1993 Jeep Grand Cherokee

1 Answer

Xj problem code p0171 p1941


manifold temp sensor is on the intake usually in front of the throttle body. Looks like the nut part of a sparkplug with two wires coming out of it. Map is generally found on the firewall has a plug harness and a vacuum line attached.

Sep 20, 2009 | 2000 Jeep Cherokee

1 Answer

When you start and rev pours out black smoke and under power no guts and black smoke pours out


You will need to do some testing. check fuel pressure regulator, coolant temp sender, manifold air temp sender, manifold air pressure sensor, throttle position sensor, and remove and "read" spark plugs...black ones may have a bad injector feeding them. A compression test may be warranted if all sensors check out. If you have a code scan done, ignore any codes for O2 sensor 'till all other components have been verified as good. Rich fuel mixture will trigger a code for that because the exhaust is beyond the ability of the sensor to read properly. A vehicle specific manual such as chiltons or haynes and a decent digital volt/ohmeter likely cost less that a one hour labor charge from any shop...a worthwhile investment you can use for this and other problem solving.
This is not really a ":solution" but I'd need to do that if I was working on it. I'm telling you where to look first.
Good luck

Aug 28, 2009 | 1996 Jeep Grand Cherokee

3 Answers

Black smoke and sluggish when accelerator is fully depressed


It seem like a vaccumn problem. Check the vaccumn lines especially the one going to the fuel preassure regulator. or it could be the regulator itself.

Dec 18, 2008 | 1990 Volkswagen Corrado

1 Answer

1997 jeep grand cherokee runs rich after long trips


Could have a bad map sensor. The Map sensor is located on the throttle body. I have seen countless Jepp that start blowing black smoke when they go bad. That would be a good starting place.

Sep 12, 2008 | 1996 Jeep Grand Cherokee

1 Answer

Runs fine when cold , when wamed up , spits and sputters, at low rpm. blows black smoke, wont ldle?


Sounds like an oxygen sensor problem. O2 sensors have to be warmed up to around 900 degrees to properly operate, so until they're up to temperature, the ECU ignores them and fuels the engine on preprogrammed fueling maps stored in the ECU. Once they're up to operating temperature, they provide feedback to the computer for properly fueling the engine. Blowing black smoke indicates a rich condition (excessive fuel), which usually is the result when and oxygen sensor is defective. The computer realizes the O2 sensor isn't working right and goes to a rich-fueling map for the engine. Rich running is not damaging, other than it can foul spark plugs and (if untreated for a long enough period) could clog the catalytic converter. This is better than a lean condition (too little fuel) which superheats the cylinders and causes them to detonate, which can fatally damage the engine. I would change out the primary oxygen sensors and see if your problems go away. You may need to get new spark plugs as well, especially if this has been going on for awhile - they may be carbon-covered and not firing efficiently.

Jul 27, 2008 | Lincoln Mark VII Cars & Trucks

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