Question about 2003 Jeep Grand Cherokee

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MISFIRE CYLINDER #3 CHECK ENGINE LIGHT COMES ON VEHICLE

2003 JEEP GRAND CHEROKEE MISFIRE #3 (CODES P0203 & P0303) CHECK ENGINE LIGHT COMES ON VEHICLE CHUGS THE PCM HAS BEEN CHANGED BY DEALER A HEAT SHIELD HAS BEEN PUT ON THE FUEL INJECTOR AND SPARK PLUGS HAVE BEEN CHANGED. AFTER THE PCM WAS REPLACED THERE WERE NO PROBLEMS FOR 2 MONTHS NOW HAVING SAME PROBLEM BEFORE PCM WAS REPLACED.

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  • 21 Answers

Check spark plug wires for corrosion

Posted on Aug 27, 2009

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P1763 and p0303 codes for my 02 jeep grand cherokee. car is super sluggish and shakes when gets to 50mph.


no engine stated.??????????
303 is gross misfire on #3 cylinder. on all cars.
its a for sure thing, means bad combustion on #3 and its power is weak. 1763 is tranny The 7 means that. and is problem2.

ever get a 60k miles tunup this decade?
sparks plugs, spark wires, filters, air and fuel>?
spark plugs dont last life of any engine.
THE CEL blinking (oper guide tells) means that misfire
is burning the CAT converter to a crisp. (raw fuel + air does that)
the opr. guide says get it serviced, fast, dont drive fast or tow anything. all great advice in the glove box.

get a cheap tuneup, and magic can happen in most cases.
misfire has many causes. over 20.
but a tuneup not done, is 99% cause. (due to nobody doing them)
only fate , determines truth, not statistics....
for example you sucked a valve on #3..

if the new spark parts dont fix #3 a compression tests is next.
or an injector balance test say from #3 to one other injector.
all this is like 1hr work, but no engine stated, so.....

Apr 24, 2015 | 2002 Jeep Grand Cherokee

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Error codes p0108/p0203/p0303 what are they


what engine, cant fix,them not knowing that.. so what engine is there, opted day 1.
they are failed ECU/PCM tests.
thats correct the light means the EFI (or other parts) needs service.
it means SOMETHING IS WRONG.
if you had the FSM , and read the page under P0108 youd
see the book telling you what the test does, and how to isolate
that problem, to the CAUSE.
the PCM does not EVER know cause, only what tests fail.
see?
303 is cylinder 3 misfire.
108 means the Baro MAP sensor is reading too high
203 means injector 3 , is reading wrong.

Id first check injector 3 , for connector fell off or wire damage there.
or pins corroded
then disconnect it and measure the injector coil resistance.
infinity is a blown coil.. it will read the same as the other 3,
if all read 10 ohms then that is correct. (im not locking up the spec here, you can RTM , FSM or alldata.com and see it)

203 is a hard fail. i do them first.
the map might read wrong do to a dead #3 cylinder
and #303 misfire, id bet is a victim of bad injector #3

Feb 02, 2014 | 2002 Jeep Grand Cherokee

1 Answer

04 Jeep Grand Cherokee/ P0303-possible vaccum leak


That code i think is a Cylinder 3 misfire.

May 28, 2012 | 2004 Jeep Grand Cherokee

1 Answer

2005 jeep grand cherokee 3.7 liter p0303 code


Most likely ,even though you have a 303 code, that
it wasn't that cylinders coil that failed

Need to put the old coil back & walk new one to different
cylinder or use a professional scan tool in Mode $06 ,to see
the misfire counts on all cyl's

Unrelated,I would loose the front O2 sensors after 7 years
& 100,000 miles

Never need to do plugs to diagnose problems
Only do plugs every 3 years a preventative maintenance

May 26, 2012 | 2005 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

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

1 Answer

The check engine light has come on in a 2003 jeep wrangler, the code is 303.... What does this mean?


a p0303 is a cylinder number 3 misfire, which means that the computer is reading that the number three cylinder of the engine isn't contributing as much power as the others. usually is just a tune-up issue, i would suggest checking or replacing tune-up components. that will usually handle it.

Dec 10, 2009 | 2003 Jeep Wrangler

1 Answer

What is the code po 0303 for a 2003 jeep grand cherokee


P0303 means misfire on number 3 cylinder. It could be a spark plug, spark plug wire, coil pack, or maybe fuel injector. What ever it is, the number 3 cylinder is the problem.

Oct 22, 2009 | 2003 Jeep Grand Cherokee

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