I have a 2001 Jeep Grand Cherokee - Limited My

That's encouraging to hear. As for the code, you may have had a slight carbon buildup on the O2 sensor. An idea to try would be a Seafoam treatment. You can get Seafoam at the parts store. I've done it on a number of vehicles and I'm a big fan.

Get two cans of it. Dump one entire can into the gas tank, and fill up the tank on top of it. This will allow it to clean the fuel system - it'll demoisturize the fuel tank, clean the lines, clean the injectors, the backside of the valves, and the domes of the combustion chambers, restoring lost displacement and allowing the engine to run more efficiently.

With the second can, pour half into the oil, drive 100 miles, and then change the oil and oil filter. It'll break down oil sludge throughout the engine and allow the oiling system to work better. Small oil capillaries in the engine (particularly the cylinder head) can become blocked by sludge, and this will break that down and free up the oil channels. The broken-down sludge will flow back to the pan, where it'll be drained out (or caught in the filter) and you'll get it out of there.

The second half of that can gets poured into a mug. Get a 3 foot section of vacuum line at the parts store and have a helper with you. Start the engine, and pick a vacuum line on the intake manifold. Pull it off and feel for suction. Where the suction is, you want to use that suction to draw the Seafoam up into the engine. Your assistant will sit in the car and keep the engine at about 2000 RPM (sucking the Seafoam in will cause it to stumble and stutter). Once the Seafoam is sucked up, allow the car to run another 10 seconds or so (so it can circulate throughout the vacuum system of the car), then shut it down for 15 minutes. This lets it soak inside and break down carbon deposits all over the inside of the engine.

When you restart the car, it'll be stumble a little bit more, and may be hard to start, but that's normal. Once it does start, let it idle until it smooths most of the way out, then rev it up. You'll get huge clouds of smoke out the tailpipes - that is the Seafoam and the carbon buildup burning off. Rev it up and down periodically for a little while, and then just let it idle while it burns away the remainder of the Seafoam. It'll take awhile, and may even smoke a little when you drive away the next time, but it'll stop shortly. While it is still smoking, the Seafoam will de-carbon the exhaust system, including your O2 sensors, so you may get a benefit toward your problem that way too.

The net result is a car that runs much more efficiently. I did a VW Passat V6 for a guy last spring, and his fuel mileage for the next month went up by over 3mpg, with smoother idling and quicker starting to boot. Try it out - it may help you out with your current issue too.


That's encouraging to hear. As for the code, you may have had a slight carbon buildup on the O2 sensor. An idea to try would be a Seafoam treatment. You can get Seafoam at the parts store. I've done it on a number of vehicles and I'm a big fan.

Get two cans of it. Dump one entire can into the gas tank, and fill up the tank on top of it. This will allow it to clean the fuel system - it'll demoisturize the fuel tank, clean the lines, clean the injectors, the backside of the valves, and the domes of the combustion chambers, restoring lost displacement and allowing the engine to run more efficiently.

With the second can, pour half into the oil, drive 100 miles, and then change the oil and oil filter. It'll break down oil sludge throughout the engine and allow the oiling system to work better. Small oil capillaries in the engine (particularly the cylinder head) can become blocked by sludge, and this will break that down and free up the oil channels. The broken-down sludge will flow back to the pan, where it'll be drained out (or caught in the filter) and you'll get it out of there.

The second half of that can gets poured into a mug. Get a 3 foot section of vacuum line at the parts store and have a helper with you. Start the engine, and pick a vacuum line on the intake manifold. Pull it off and feel for suction. Where the suction is, you want to use that suction to draw the Seafoam up into the engine. Your assistant will sit in the car and keep the engine at about 2000 RPM (sucking the Seafoam in will cause it to stumble and stutter). Once the Seafoam is sucked up, allow the car to run another 10 seconds or so (so it can circulate throughout the vacuum system of the car), then shut it down for 15 minutes. This lets it soak inside and break down carbon deposits all over the inside of the engine.

When you restart the car, it'll be stumble a little bit more, and may be hard to start, but that's normal. Once it does start, let it idle until it smooths most of the way out, then rev it up. You'll get huge clouds of smoke out the tailpipes - that is the Seafoam and the carbon buildup burning off. Rev it up and down periodically for a little while, and then just let it idle while it burns away the remainder of the Seafoam. It'll take awhile, and may even smoke a little when you drive away the next time, but it'll stop shortly. While it is still smoking, the Seafoam will de-carbon the exhaust system, including your O2 sensors, so you may get a benefit toward your problem that way too.

The net result is a car that runs much more efficiently. I did a VW Passat V6 for a guy last spring, and his fuel mileage for the next month went up by over 3mpg, with smoother idling and quicker starting to boot. Try it out - it may help you out with your current issue too.