Question about 1988 Jeep Cherokee

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Black smoke out of exghost

1988 jeep commanche with a 1994 4.0 and 94 injectors it seems like its running rich

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  • Richard Scordino May 11, 2010

    dida you chedka the O2 sensor ? How about the fuel pressure regulator on the rail? (and attending vacuum line) Pulling any codes???

    Do that & get back to me



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Which pcm did you use the 88 or the 94. Shoud be using the 94

Posted on Jan 30, 2009

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Why does my 1988 ford ranger 2.0L is running rough and missing and blowing black smoke


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My 1988 jeep cherokee is blowing black smoke but not to heavy and a very rich fuel smell


Black exhaust smoke means the engine is burning too much fuel. The first think you should check is your air-filter and other intake components like sensors, fuel injectors and the fuel-pressure regulator. Other reasons could be a clogged fuel return line. Black smoke is usually the easiest issue to diagnose and fix, but burning unnecessary fuel will definitely affect your fuel economy, so don't think of avoiding this one to save money, it won't work.
Any smoke coming from your car's exhaust pipe is a sign that your car is in distress. Pay attention to what it needs to ensure more miles for your vehicle.

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Also, your injectors are to big and is running rich.

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1987 jeep wrangler has a nutter bypass and runs rich


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try this ant let us know.

Apr 12, 2010 | 1987 Jeep Wrangler

1 Answer

Running rich with white/black smoke


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Mar 12, 2010 | 1988 Mazda B2200

1 Answer

4.0 runs but misses and blows blak smoke


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Feb 13, 2010 | 1988 Jeep Cherokee

2 Answers

It blows black smoke wen i get on it real hard and it also does it wen i let it sit and idle it dies sometimes


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Check carburettion.
Is this carburetted or injected?

JOAT

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1 Answer

I Have a 2000 Jeep wrangler V 6 4.0 liter. ITs running rich.


4.0 is an L 6 . Not having the luxury of being there and doing the necessary testing myself, you will need to do that. You will need to get either a chilton or haynes basic manual and a decent digital volt/ohmeter. things I'd immediately check are the map sensor, manifold temperature sensor and finally, remove and visually inspect the fuel injectors (can test good electrically but be fouled on ends, causing a poor spray pattern). These are suggestions only...I would not replace any of these without testing.
Any questions about specific items, just ask!!
Good luck

Jun 22, 2009 | 2000 Jeep Wrangler

1 Answer

4.5 liter engine runs ruff intemitent seems rich. smokes at firewall. Runs fine when cold. Runs ruff after 4 or so miles.


Hi I own a cadillac with the same motor. Never smoked but had all the same issues, ran fine cold but after a little driving (less than 2 miles) it shook like nothing else. The cause was the motor self destructed had to replace valves all 8 bosh injectors 2000 dollars later she is like new. Sorry about the bad news goodluck.

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