Question about Jeep Wrangler

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I have a jeep wrangler 2.5l TBI 4 cylinder that is not firing on the third and fourth cylinders. I am getting sparks from all four wires, changed all wires, changed all plugs, checked and re-checked distributor timing, still no joy. It sputters and idles erractically. Any suggestions

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  • othello43 Apr 27, 2010

    Compression as done by my mechanic is good. Those two plugs show signs of fuel wetting them so once there are sparks, should it not fire?



  • othello43 Apr 27, 2010

    I understand fully and appreciate the suggestions. I will try them.

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Two things come to mind.

1. Spark plug wires that are shorting out to each other. Firing a plug is easier in open air. under compression it has more resistance and so is more prone to jumping to ground or to another wire that is not under compression.

2. Possible burned head gasket between 3 and 4 would also cause your symptoms.

3. Vacuum leak on that side down by 3 and 4 on the intake manifold.

Check for leaks and then to further narrow it down we need a compression test. If the compression test is normal then try a new set of wires. If that still doesnt fix it then go back to looking for the vacuum leak. Might even be an intake manifold gasket.

Posted on Apr 27, 2010

  • Bryan Fullerton
    Bryan Fullerton Apr 27, 2010

    If they are wet then they are not firing. Since the other two are then that leaves. the plugs the wires and the cap. Id bet money that the problem is there.

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Distrbutor to spark plug wiring


Hey there janandshane,

I've got a 91 Wrangler, lots of fun. Here's your info.

Viewed from above, front of vehicle on the right side, cylinder locations are:
6 5 4 3 2 1 for a six cylinder and 4 3 2 1 for a four Cylinder

The firing order is:
1 5 3 6 2 4 for the six and 1 3 4 2 for the four.

The distributor rotation is clockwise.

To find Top dead center (for wire to cylinder #1 on distributor), look for and line up the timing marks on the crankshaft (front of the engine).

Or, pull the #1 spark plug, stuff the hole with a cork or a rag. Slowly crank the engine until the cork pops out.

Pull the distributor off. The rotor is pointing where the plug for cylinder #1 should go. The rest of the wires go in the firing order clockwise.

That about covers it.

Remember: Good things come to those who rate. How about a nice FixYa?

Mike

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