Question about 1996 Jeep Grand Cherokee

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I changed plugs and wires all in correct order 96 Gand 4.0L when i was done the truck ran like **** i so i had diagnostics done it gave codes 301 302 302 304 305 306 (all cylinders missfire ) then i changed the distributor cap rotor and ignition coil still is misfireing what else could it be ?

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  • rvangogh2272 Aug 22, 2010

    was the truck running bad to begin with?

  • zachj1982 Aug 23, 2010

    no truck ran fine i was just trying to spruce it up a bit because the plugs and wired were so old before i replaced them

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If you are certain that the wires have been replaced correctly then you could have a bad set of wires even though they are new this happens sometimes but it sounds as if the firing order is off check the engines timing to see if its still in time.

Posted on Aug 22, 2010

  • Katdaddy21 Aug 25, 2010

    are all plugs tight make sure any are not broken around the porcelin end and also make sure that all wires are securely in place on the wires.

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1 Answer

Have 1994 toy. truck with v6, when choke goes off the engine misses


Hey 94 TOY...

When did the problem start? Before you changed the wires and plugs? Or did it start, AFTER you changed the wires and plugs? Did the problem remain the same BEFORE & AFTER you made the changes?

1 - If the TOY ran fair to Okay before you did the work, then you may have done something wrong when you made the cahages. Check for correct plugs and firing order. Check for cross wiring. With engine runing pull one plug wire off each plug one at a time. Each pulled plug wire will slow down the engine. When you pull a plug wire that doesn't react and does not make any change ON or OFF that cylinder Plug.
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2 - Check for spark at that wire. If you do-not have Spark there, But the other wires do... the wire going to that cylinder is BAD.

3 - If you have the correct firing order and spark at all cylinders then the cylinder that did-not change the speed of engine has a compresstion problem. Bad valves, Piston or rings are bad... Major engine work and Major repair bill for the repair job.... GOOD LUCK....

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What do codes 301,302, and 306 mean


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I changed plugs and wires 96 Gand 4.0L when i was done the truck ran like **** i so i had diagnostics done it gave codes 301-306 (all cylinders missfire ) then i changed the distributor cap rotor and...


301 & 306 are cylinder #1 and #6 misfire. Your spark plug wires are not in the proper firing order in relation to the correct cylinder and distributor locations.

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