Question about 2001 Jeep Grand Cherokee

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Jeep Hesitates. P0303 code

I've replaced Coil Pack, Plugs, Cam sensor, Crank sensor, 3rd injector. and I still have code P0303. Jeep is missing ..
6 cylinder 2001 grand cherokee

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  • 5 more comments 
  • Anonymous Apr 02, 2009

    Havent gone as far, but I have the same problem

  • Anonymous Mar 18, 2014

    Replaced lock and cylinder in 94 Jeep Grand Cherokee should I had also replace the ignition switch

  • Anonymous Mar 19, 2014

    I was driving my Jeep in town. Suddenly three cylinders started missing pretty bad. Change spark plugs, swap coils around, nothing solve the problem. Any suggestions ?

  • Anonymous Mar 20, 2014

    how do you check a crank sensor and cam sensor in a jeep grand Cherokee

  • Anonymous Mar 23, 2014

    I change new coil from de dealer later I cam sensor and crank sensor sometime is shut down and wont star

  • Anonymous Mar 29, 2014

    cracking sound at engine coil pack, spark plug ,crank shop sensor and PCM all replace new

  • Anonymous Mar 30, 2014

    when a transmission sensor goes out what happens

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  • 2 Answers

Check the cylinders Commpression. over 115 psi is good, 120 psi is normal.

Posted on Sep 17, 2008

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1 Answer

DTC P0300, P0301,P0303


The codes are for a random miss, and a miss on cylinders 1 and 3.
It could be ignition or the fuel injectors, or a vac leak or mechanical problem such as a cam.
The computer sees a drop in RPM on those cylinders noting a drop in horsepower.
A mechanic would verify those two cylinders are firing and getting fuel then check for mechanical problems.

Aug 25, 2012 | 1997 Plymouth Breeze

1 Answer

Piston 3 and 6 are misfiring the jeep shakes and doesnt accelerate well


Code P0303 and P0306...

A code P0303 and P0306 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer

Possible Solutions: If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.


Hope helps.

May 03, 2011 | 2002 Jeep Grand Cherokee

2 Answers

Kinda putters then engine light came on and its giving me a code p0303


p0303 is a mutible engine misfire on number 3 cylinder. the best fix,

A code P0303 may mean that one or more of the following has happened:

  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • but first of all check the wires and sparkplugs first!

Feb 18, 2011 | 2001 Jeep Grand Cherokee

2 Answers

How to replace spark plugs on 2000 jeep cherokee classic 6 cyl.? Also does 2000 cherokee have inline fuel filter?


TO REPLACE SPARK PLUGS YOU REMOVE COIL PACK MOUNTING BOLTS THEN REMOVE THE COIL PACK WITH BOOT OVER THE SPARK PLUG.YOU HAVE 6 INDIVIDUAL COIL PACK TO EACH CYLINDER. YOU NEED A 3/8 RATCHET WRENCH - LONG 3/8 EXTENSION -SPARK PLUG SOCKET - SPARK PLUG GAUGE.AND TORQUE WRENCH.THE 2000 MODEL JEEPS FUEL FILTER INSIDE THE TANK.1993 - 1996 MODEL JEEPS FUEL FILTER LOCATED LEFT SIDE OF THE VECHICLE NEAR THE FUEL TANK.

Jul 20, 2010 | 2000 Jeep Grand Cherokee

2 Answers

I have a 1996 Plymouth Grand Voyager SE with a 3.3 liter V6 Engine. It hasn't been firing on the 6th and 3rd spark plugs, and is only running off of 4 of them. I was told to replace the camshaft position...


The coil pack unit's circuit #3 drives plugs #3 and #6 directly from the PCM. If the cam sensor was defective, it should not fire any plugs. Suspect bad wiring from the PCM to the coil pack, the PCM unit itself, or a segment of the camshaft position sensor surface has lost magnetism causing missing signal to the PCM. An oscilloscope is the best test instrument for chasing down a missing pulse problem. The missing timing signal also explains why the PCM would report a 'bad camshaft sensor'. Hope this helps!

May 11, 2010 | 1996 Plymouth Grand Voyager

3 Answers

1999 jeep cherokee 6 cylinder engine light


1.Plugs
2. Vacuum leak
3. Injector fault
4. High or low fuel pressure.
Thats the list of things to check.
This is a #3 cylinder misfire.
There is also TSB about #3 injector needing added heat protection. This could definitely be the cause. I start at plugs and go from there.
Hope this helps.
Thank you,
Lee

Dec 12, 2009 | 1999 Jeep Grand Cherokee

2 Answers

1996 Jeep Grand Cherokee No Start


I would be thinking that there is a good chance that you need to be checking out replacing the computer, if you aren't getting any communication with the proper scan tool then the computer isn't communicating with anything in the vehicle...... I would have guessed first off that the ignition control module might be bad but that is obviously part of the computer also, I would be looking in that direction.

Sep 19, 2009 | 1996 Jeep Grand Cherokee

2 Answers

Has a code 0174 and 300 code checked intake gasket that was good replaced fuel pump to low of pressure took on highway ran fine but somtimes has miss on right side mostly 4 and 6


could be many things cam sensor crank sensor fuel injectors or the coil could be the issue if its a multi port fuel injected system.

Jul 18, 2009 | 2005 Chevrolet Tahoe

2 Answers

2001 ford taurus p0301 and p0303


You are mis fireing on cyl 1 and 3 if you replaced plugs and wires and coil this is going to be a fuel injector issue or valve issue. See if you can swap the injectors with known good cyl. and see if it changes. Or have a shop do a fuel injector service on it to see if it helps. It may be to late for the fuel injector service.

Mar 01, 2009 | 2001 Ford Taurus

2 Answers

I cant get spark out of the coil pack


cam sensor fires the injectors to synchronise injector pulsing with the spark at the spark plugs.. U need to probably change the crankshaft sensor (around the crank pulley) as the crank sensor is what controls the ignition spark.
hope that does it.
:)

Jan 20, 2009 | 1996 Plymouth Voyager

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