Question about Jeep Grand Cherokee

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My Cherokee Laredo V6 engine have 1 cylinder not firing, checked the voltage of the wires connected to the injector and one is under voltage while the rest have the same voltage. changed the spark plug but problem persisit, could it be in the computer box? can it be repaired?

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  • Jeep Master
  • 21,873 Answers

The only V6 engine I could find in a Cherokee was in the mid 1980s and it was carb not fuel injected. The 4.0 straight 6 engines that were fuel injected used the same black wire for all 6 injectors to power them. Each injector has a different ground wire from the computer.
The injector in question should have the same input voltage as the others and then a ground signal on the other side when the computer commands it to open. All 6 injectors should also have the same resistance when the harness is unplugged.

Posted on Jan 08, 2013

  • Cenrick Jan 09, 2013

    Stephen thank you for your quick reply, I'm very sorry for the mistake, it was indeed an in line 6 cylinder engine on my cherokee.. So the problem might be coming from the computer if one of the injectors have a low voltage which is not enough for it to open.. if its the case, can you help me find a replacement computer box? Thank you very much for your help..

  •  Stephen
    Stephen Jan 09, 2013

    Well, I said all 6 injectors get power from the same black wire. So if one injector has less than battery voltage it can't be the computer. You would need to check the wiring harness among other things. Keep in mind one of the injectors could be shorting to ground and causing the problem. I always check the resistance of the injectors if one is in question. And all 6 should be unplugged when they are checked to make sure one faulty injector is not causing problems in the circuit.

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SOURCE: Misfire on cylinder 1 and 3

Do you observe abnormal idle speed? It may be just an indicator fault; not a really engine firing problem.
Sign up free at link http://ww.hmaservice.com/
You will find a lot of technical information for your model.

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SOURCE: 2001 sonata V6 spark plug

For starters if your going to do 1 do all. The locations are from left to right when standing in front of the car. 1, 3, 5
2, 4, 6

wires are 3
6
2
4
5
1

Posted on Nov 05, 2008

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SOURCE: Changed the plugs...

Yes, the code will need to be cleared by the technician.

Usually the check engine light doesn't come back on immediately. However it will store the code until it is cleared by the tech.

If it comes back on immediately, then you have an immediate problem b/c it take a certain number of misfires over a certain number of miles before it trips the code again.

Posted on Feb 10, 2009

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Before changing you pcm try cleaning your egr valve. remove the valve and see if its stuck in the open position if so use a small pick to clean around the spring.

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SOURCE: 98 grand cherokee cyliner 1 misfire,, HELP ..

it has cap not coil pack , you try decarb might get lucky any ticking ? next is leak down on the cylinder and determine weather rings or valves how many miles wheat are the engine codes now check and the plug again , did it have misfire on the same cylinder before you worked on it adn after you worked on it. What is running compression. all these answers are to answered some you can do some will need more tools.

Posted on Jan 03, 2010

Testimonial: "whats decarb.. ??? and whats leak test on the cylinder ? please help ..."

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