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I have a 1987 924s porsche..i had an intake leak at the intake manifold gasket but it ran pretty good considering for 20 thousand some odd miles with a little mis. So i replace the intake manifold gasket and now it cranks but will not start..i replaced the distributer cap.rotor button.plug wires plugs.ignition coil.fuel injectors.i am tired of replacing i need to find the root.have spark.have fuel to the fuel rail.help!!! How do I test the air flow sensor.will not start with starting fluid.so i think i dont have any air?help?

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If you have spark and gas it should at least fire unless you don't have any compression. I would make sure that you have spark on all cylinders at the spark plugs.

Posted on Oct 19, 2013

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  • George Lagos Oct 19, 2013

    how do I check the compression if it will not start?

  • George Lagos Oct 19, 2013

    thank u very much!also i have pulled all 4 plugs..while cranking the motor i have spark on all 4

  • George Lagos Oct 19, 2013

    thank u very much!also i have pulled all 4 plugs..while cranking the motor i have spark on all 4

  • Jonathon Smith Oct 20, 2013

    The car should not be running to check compression. Just attach a copression tester to the spark plug hole and let the vehicle crank over about 5 times and then read the gage.

  • George Lagos Oct 20, 2013

    Thank u.do i check all four plug holes?do i leave the other three plug wires in?and what should the guage read?

  • Jonathon Smith Oct 20, 2013

    Yes, check all four cyinders. Should be atleast 120psi.

  • Jonathon Smith Oct 20, 2013

    Make sure you keep away from the plug wires when cranking the engine. They put out a high voltage that can harm you.

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Posted on Jan 02, 2017

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SOURCE: 1996 Jeep Grand Cherokee No Start

i have a 1996 jeep grand cherokee and im not getting spark to the plugs.i replaced the crankshaft sensor and ignition coil already and still having problem.if i replace the camshaft sensor would that fix the problem ??? Or what should i do ???

Posted on Jul 23, 2012

ZJLimited
  • 17970 Answers

SOURCE: po300 code possible fixes?

HI there:

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

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 this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Posted on Aug 03, 2012

Testimonial: "thank you for your suggestions.codes were cleared,so far po140 has not returned (bank one,sensor two).code po300 returned in less than five minutes.will check vacuum,hoses,and egr next."

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