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Amedee
Amedee, Jeep Technician
Category: Jeep
Satisfied Customers: 24438
Experience:  ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
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I have a 1998 Jeep Cherokee Sport. it has the 4.0 L engine.

Customer Question

I have a 1998 Jeep Cherokee Sport. it has the 4.0 L engine. The engine was missing so I replaced the plugs, wires, distributor cap and rotor. Before replacing these parts I had a P0301 code. Now after the tune up I am getting a Po305 code. I think this means I have a misfire on the number 5 cylinder. What could be the problem and which is the number 5 cylinder?
Submitted: 1 year ago.
Category: Jeep
Expert:  Amedee replied 1 year ago.

Hello and welcome! Can you feel the engine misfiring? IF so, does it misfire all of the time or just under certain conditions?

Customer: replied 1 year ago.

It seems to misfire mostly when I first start the vehicle up. After it warms up it seems to run fine.

Expert:  Amedee replied 1 year ago.

If the tune up parts have been replaced, I would suspect a weak valve/burned valve, carboned up valve on number 5 cylinder or an intake manifold gasket leak near number 5 cylinder.

Expert:  Amedee replied 1 year ago.

Another possible cause could be a leaking or slightly plugged injector on number 5 cylinder.

Customer: replied 1 year ago.

If I ran a bottle of injector cleaner through the engine could this help? The reason I ask is that the reason I did the tune up in the first place is because I was getting a P0301 code. But after replacing the plugs, wires, dist cap and rotor I do not get the P0301, I only get a P305.

Expert:  Amedee replied 1 year ago.

It would not hurt to do so..

Customer: replied 1 year ago.

which is the number 5 cylinder?

Expert:  Amedee replied 1 year ago.

The second to last cylinder

Expert:  Amedee replied 1 year ago.

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Expert:  Amedee replied 1 year ago.

Hello! It's Amedee from just answer. I am just checking in to see if you need any further assistance?