1997 Jeep Wrangler P0300 DTC

Engine Performance problem
1997 Jeep Wrangler 6 cyl Four Wheel Drive Manual

i have a 1997 jeep wrangler with 4.0l i-6 iam getting a p0300 dtc I have replaced all ignition componets including the camshaft position sensor I ran compression check on all cylinders and they all were above 158 psi also checked fuel pressure which was in spec the problem is the engine runs fine till about 3000 rpm the I get the p0300 code?
Do you
have the same problem?
Sunday, September 28th, 2008 AT 2:44 PM

1 Reply

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 SolutionsIf 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.
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Sunday, September 28th, 2008 AT 2:53 PM

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