Question about 2005 Jeep Grand Cherokee

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Has rough idle, engine light on, codes P0303 and U3FFF. Have had installed new coil pack and new injector on cyclinder 3, same problem persist.

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Check spark plug and wire
test oxygen sensor
check compression ( valve might be at fault)
have computer checked

Posted on Jul 05, 2010

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Posted on Jan 02, 2017

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2 Answers

2001 chevy cavalier code po303 how to fix it replaced the spark plugs how to fix it it has a rough idle, weak acceleration ce light starts flashing on acceleration and hard to start


change the ignition coil pack common problem p0303 means cylinder 3 misfire and the coil pack are know to go out on these particular models

Apr 07, 2017 | Cars & Trucks

1 Answer

Error code p0420 and p0303


Code 303 is a miss or lack of power on cylinder 3. If you know for a fact that cylinder is getting spark it could be an injector problem.
Code 420 means the catalytic converter is not performing up to standard which could be several things including the miss on cyl 3.

Jan 30, 2014 | 2005 Chevrolet Trailblazer Ext

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I have a 97 dodge caravan 2.4L dohc. I started with an engine code of p0303 and p0304. The vehicle has a rough idle and has difficulty accelerating from idle to 35mph. I've run several tests; 1, pulled all...


DTC P0303: Cylinder 3 Misfire Detected
Probable cause:
  1. Control unit software needs updating
  2. PCM or ECM faulty
  3. Fuel injector(s) faulty
  4. Ignition system - Ignition module, coil, spark plugs and wires
  5. Fuel system

Mar 13, 2017 | 1997 Dodge Caravan

1 Answer

My 2003 gmc envoy has p0303 error code. I have since changed the plugs but the code is still there. What else should I look at before changing the expensive coil on cylinder 3?


To find out if it is the coil pack, swap #3 pack with another cylinder and see if the fault changes. If not, you should check the compression on cylinder #3. If that is OK, I would suspect a bad injector.

Dec 28, 2012 | 2003 GMC Envoy

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Engine light comes on and engine runs rough.


That's not a question

You have a check light on- got to
get codes set and diagnose that issue

Runs Rough--may be related,still have to
have diagnose and repair

If you do all your own work,
ask a question

Feb 09, 2011 | 2004 Jeep Grand Cherokee

9 Answers

Misfire #3 cylinder


Has anyone found the problem? My 2003 has #3 cyclinder misfire and I have replaced the plugs and wires. It runs rough at idle but smooths out at highway speed. Anyone have any knowledge on this? This sounds like a common problem.

Sep 09, 2009 | Cars & Trucks

3 Answers

Check Engine P0303 Code. Stays solid then blinks.


ok a P0303 Cylinder 3 Misfire Detected is a hard code meaning your problem is not intermetent,if you all ready changed the spark plugs and wires,the next step is to check the injector for the #3 cylinder,also if you can try using another ignition coil,check the crank position sensor and last try moving the plugs aroud to see if the code changes or if you get a new one,i dont think you will be stranded but the engine performance is crapy.

Sep 09, 2009 | 2001 Dodge Caravan

2 Answers

Error code p0303 cylinder 3 misfire My 2002 Ford Escape was in a front-end collision requiring the replacement of the radiator and cooling lines, etc. When it came back from the body shop the check engine...


It is possible that the wire may have been damaged and is arcing. Check the wire, may also be the plug. If that doesnt solve the issue it could be the ignition coil.

Apr 06, 2009 | 2002 Ford Escape

3 Answers

2001 v6 escape rough idle when cold


To update my earlier repair on the 2001 6 cyl Escape: When cold, and when the ignition was turned over but no accelerator pressure given, the rough idle finally returned the P0303 code again when the check engine light came on indicating that it wasn't caused by the plugs or the coil. FYI, I had replaced the intake manifold gaskets during the original repair and just prior to that I had replaced the fuel filter which was very dirty (I cut it open to see).

The repair manual referred to fuel injectors as a possible problem. I have run three tanks of fuel using different injector cleaning products and am very pleased with the results. Cold starts are much smoother and I am unable to coax out the P0303 code or any other code.

My opinion, change the fuel filter, use a fuel injector cleaner for a couple of tanks, change the plugs if the problem still exists. The coils were not the problem on my vehicle.

Jan 17, 2009 | 2001 Ford Escape

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