Is it time to replace fuel filter? - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 20 (permalink) Old 06-23-2011, 09:24 AM Thread Starter
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Is it time to replace fuel filter?

Has anyone replaced thier fuel filter because of sluggish, hesitation after startup? I'm thinking this could be the solution to my problem. I'm having issues after startup when pulling out IF i don't let the '06' 3.7 warm up and idle for at least 20 secs. It'll try to stall and will not go if I start and engage gear, as though it's not getting gas. This will go on for 5-7 secs. then it'll accellerate and resume normal drive. Never seems to happen when I let it warm up for a few. I don't think it's the pump, I hear it running and shut down when key is turned. any ideas?
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post #2 of 20 (permalink) Old 06-23-2011, 09:50 AM
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I didn't think you ever needed to replace the fuel filters in these newer vehicles.





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post #3 of 20 (permalink) Old 06-23-2011, 11:05 AM
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The fuel filter is a "lifetime" product. Besides your symptoms don't sound like a fuel filter.

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post #4 of 20 (permalink) Old 06-23-2011, 11:45 AM Thread Starter
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The filter was just a thought.
The idleing after startup is rough, like it's struggling to stay running. After a short time, it'll run smooth. Never any codes thrown. I took apart the air intake and cleaned the throttle body with mass airflow cleaner, and the problem persists. There are sensors around the throttle body, do any of these ever need cleaned or maybe replaced?
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post #5 of 20 (permalink) Old 06-24-2011, 08:47 AM
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Problems such as this in this modern age are always sensors of some kind. The days of checking AIR-FUEL-SPARK are gone forever.
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post #6 of 20 (permalink) Old 06-24-2011, 02:27 PM
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Quote:
Originally Posted by rhobll View Post
Has anyone replaced thier fuel filter because of sluggish, hesitation after startup? I'm thinking this could be the solution to my problem. I'm having issues after startup when pulling out IF i don't let the '06' 3.7 warm up and idle for at least 20 secs. It'll try to stall and will not go if I start and engage gear, as though it's not getting gas. This will go on for 5-7 secs. then it'll accellerate and resume normal drive. Never seems to happen when I let it warm up for a few. I don't think it's the pump, I hear it running and shut down when key is turned. any ideas?
You can connect a manometer to measure pressure and in strips, then make conclusions about the fuel system.

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post #7 of 20 (permalink) Old 06-24-2011, 02:29 PM
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Quote:
Originally Posted by XKDRIVER View Post
Problems such as this in this modern age are always sensors of some kind. The days of checking AIR-FUEL-SPARK are gone forever.
idle sensor illuminates the check engine

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post #8 of 20 (permalink) Old 06-24-2011, 10:24 PM
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How many miles on the vehicle? When was the last time you changed plugs? Ignition cable?

The designers do intend for the fuel filter to last the life of the vehicle. Pretty sure you have to lower the gas tank to replace it. Its more modern fuel is the reason they don't need changed as often, much better quality control.


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post #9 of 20 (permalink) Old 06-25-2011, 01:58 PM Thread Starter
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Join Date: Feb 2011
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Thanks. I'll pressure test the fuel system.

I bought this w 42k, installed the Iridium 1X plugs only, no wires,at 46k, currently have 55k. This problem occured before the plug change. and still happens. That was my first guess. I'm able to live w it, just every once in awhile I'll forget to let it warm up for a few, take off and it'll just about die on me, and after a few secs catch and everything will be fine. It's frustrating. Maybe i'll replace the ignition cable and go from there.
Thanks for the advise.

Last edited by rhobll; 06-25-2011 at 02:01 PM.
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post #10 of 20 (permalink) Old 06-26-2011, 10:48 AM
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Quote:
Originally Posted by rhobll View Post
Thanks. I'll pressure test the fuel system.

I bought this w 42k, installed the Iridium 1X plugs only, no wires,at 46k, currently have 55k. This problem occured before the plug change. and still happens. That was my first guess. I'm able to live w it, just every once in awhile I'll forget to let it warm up for a few, take off and it'll just about die on me, and after a few secs catch and everything will be fine. It's frustrating. Maybe i'll replace the ignition cable and go from there.
Thanks for the advise.
Yea, the new ignition systems, they do some revolutionary designs NOT universally supported by typical plugs. Most people stick to the exact brand/model recommended in the O.M., because they are tested and proven to work properly with your ignition.

Some of the ignition system have reverse current flow in half the plugs, that reverses the anode/cathode effect of those plugs, and with different metal plugs, like single platinum/iridium, the result of reversing cathode/anode is the rate erosion is much much faster. The fact the makers of double platinum plugs advertise this is exactly why they make double platinum, is proof that there is something to this theory.

As well, the number of people that report ignition symptoms shortly after changing plugs, leads credence to it also.

You problems could be ignition, and using the different then recommended plugs would lead me to NOT rule out ignition/plugs as a possible cause yet.

A new set of plugs (by brand/model, part number in the O.M.) and the hour to replace them, may be worth it to eliminate it as a possible cause.


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