P0303

[qtatew]

Took 01 Jeep Grand Cherokee Laredo to dealership yesterday. They diagnosed #2 cylinder misfire and prescribed 6 cylinder tune up and & throttle body/fuel injector service. $324.70 dollars later I'm driving home and check engine light comes on again, not to mention I now have a rough idle, with p303 or a #3 cylinder misfire. I am not happy. I didn't have this problem before and I don't want to pay for them to screw it up again. Any thoughts on the cause of rough idle or new cylinder misfire?

[rksnc]

Why did you take to dealer for service. I guess it was running good. That is if it didn't have a problem. But cyl misfires can be misdiagnose. Wish I made that much on tune up, if that is what you want to call it. Since you don't tune one up today but service it. Fuel cleaning can help alot of things but don't always fix the problem, sounds like they miss something or mechanic made dumb mistake like forgot to gap the plugs. I would take it back but be wise and don't let them get the best of you. But they may very well need to fix thier mistake.

[qtatew]

Originally Posted by rksnc

Why did you take to dealer for service. I guess it was running good. That is if it didn't have a problem. But cyl misfires can be misdiagnose. Wish I made that much on tune up, if that is what you want to call it. Since you don't tune one up today but service it. Fuel cleaning can help alot of things but don't always fix the problem, sounds like they miss something or mechanic made dumb mistake like forgot to gap the plugs. I would take it back but be wise and don't let them get the best of you. But they may very well need to fix thier mistake.

I was extremely wary b/c of exactly this kind of stuff but took it to the dealer b/c the front left window regulator broke and I couldn't find one after market. List price from Chrysler was over 220.00 They fixed it for about 347 total. While it was there, they noticed engine light on. My car needed an inspection for state of tx and they said it wouldnt pass with the light on. They diagnosed that it had #2 cylinder misfire and to fix it w/. tune up & throttle body & injector service. I was skeptical but the light was off when I got it back.

They tried to push me to let them change air & fuel filter and quad ring which I turned down.

My biggest concern is passing the state inspection.

[Bob D.]

Originally Posted by qtatew

They tried to push me to let them change air & fuel filter and quad ring which I turned down.

Change the air filter, but the only reason they should replace the fuel pump quad ring is if it's losing fuel pressure.
There is a fuel filter in the fuel regulator but it rarely goes bad..again, relace only if you are having issues with the engine/fuel system.

[Cam7]

Most of my experience on the 300 codes usally come from a bad plug or wire and Injectors. usally it is a bad plug that has been over looked. Every time you go to the dealer it is going to be costly. Take it back and dont let them talk you into more repairs.