Question about 1996 Jeep Grand Cherokee

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1996 jeep grand cherokee limited 5.2L V8 getting p0300, p0308, p0301, p0302, p0303, and p0304. replace the spark plugs, wires, rotor, distributor (all?) and (all?) fuel injectors.

I was getting the codes for bad fuel injectors in 2 and 4 (what codes,skip no codes and win) along with every single cylinder misfiring along with a random misfire. After I changed the fuel injectors it is running better, but not the way it was.(when was was?) I am still getting p0300, p0308, p0301, p0302, p0303. and p0304 in that order. Can anyone shed some light? sure (I edited your post to show all missing facts) if you pulled the distributor ,that be it. I did not read the manual,for Disrib. 5.2L v8 its free to read. ok> ask.

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  • Level 1:

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  • 4 Answers

Try camshaft position sensor i have same problem with mine 2000 grand cherokee 169k

Posted on Mar 21, 2014

  • 5 more comments 
  • Jayburt Mar 21, 2014

    Try the camshaft position sensor like Lilith said but also on mine it was the ignition coil, yes it still sparks but not correctly and it caused the same problems you've listed.

  • tommy mcgarity Mar 23, 2014

    Try v power spark plugs They worked on mine no codes and i

  • tommy mcgarity Mar 23, 2014

    drove 700 miles

  • tommy mcgarity Mar 23, 2014

    drove 700 miles

  • _-__-___-_
    _-__-___-_ Jan 15, 2016

    slept on it
    need the 5 questions answered
    and what engine did before hands touched it.
    even bad fuel does P0300

    all random misfires do, for all reasons that.
    i bet he pulled the distributor out of block
    willly-nillly.

  • _-__-___-_
    _-__-___-_ Jan 15, 2016

    btw all ecu report,dtc for crank sensor failure
    even 1 in 10 hits. drop 9 good , 1 bad, 9 good, P0340 355 CKP,errors.
    all do.
    not reporting that,is NO WIN>
    the advanced books on eCu cover these facts
    and ive tested them to prove it
    have bench test rigs to do that.
    i have a ecu simulator too.(both ways)

  • _-__-___-_
    _-__-___-_ Jan 15, 2016

    he only need to scan running, and look
    at live dTC and pendings.
    hark ,no sensor errors
    and checks spark it is timed right or wrong.
    he didnt/
    if wrong he messed up the distributor pulling it.

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  • Jeep Master
  • 20,706 Answers

So many possible lacking key facts and history
car sat for how long.?
is or was fuel bad?
what was the original symptoms be for hood up.?
what parts changed?, WAS whole distributor?
then i know you did it wrong... lost cam SYNC.

ANSWER:(COIN TOSS) LITTLE DATA.
pretending ran perfect 3 days ago an no fiddling under hold... i say.
only one DTC matters(IN YOUR LIST)
P0300
random misfire
and if scanned running and you felt misfire?
and no other codes, then it say, ckp and cmp are ok.
TO SCAN A CAR RIGHT DO DRIVING
ERRORS HAPPEN UNDER LOAD (HILLS )
YOU NEVER SAID IT DONT DRIVE....??????


P0300s means random weak combustion on all cylinders
has may causes.
it be lean runnimg or too rich
a real scan too can see that'
my guess is you only have a cheap code reader

and is hopeless tool.

what isn't it ?
not all 8 COPS are bad
not all 8 injects bad.
it can be high fuel pressure
or tool low.
could be bouncing vacuum , check that?
if we had full obd2 data scan, of all PID data
we'd have something but we don't.


02 dead , or closed loop dead.
LTFT way off
other sensors read wrong? hot engine

Posted on Jan 03, 2016

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  • Expert
  • 115 Answers

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
  • Defective computer

Posted on Jan 03, 2016

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Posted on Jan 02, 2017

  • 34 Answers

SOURCE: 2001 jeep grand cherokee limited

no o2 couldnt do that it would have jump time you need to ****** your timing back to its time to get them ploblems fix then get a new timing belt dampner to keep it on track dont run anymore untill you get this fixed

Posted on Jan 16, 2010

  • 14036 Answers

SOURCE: 96 jeep cherokee misfires on cylinders 5 and 6

do a compression test on cylinder 5 & 6 you could have intake leak.and a leaking head gasket or worn valves in those cylinders.

Posted on Dec 13, 2009

  • 21 Answers

SOURCE: MISFIRE CYLINDER #3 CHECK ENGINE LIGHT COMES ON VEHICLE

Check spark plug wires for corrosion

Posted on Aug 27, 2009

ZJLimited
  • 17970 Answers

SOURCE: my 2001 jeep grand cherokee laredo is having

P0300 Diagnostic Code - Random/Multiple Cylinder Misfire Detected
Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present

Causes: A code P0300 may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
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.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.


About P0301 or P0302 code, this means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #1 and #2.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present


Causes: A code P030x 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 (remember to rate and commet this answer).

Posted on May 13, 2011

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A code P0300 may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
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.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Hope helps.

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