Question about 2000 Chevrolet Cavalier

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2000 Cavalier Z24 2.4l Car was running fine. Then started to get rough and when I came to a traffic light it stalled. Started after 4 attempts, but still very rough. Limped home and let it cool. Pulled the spark plugs. - I have spark on all four. The plugs were extremely black. I replaced them with new NGK's and it started but ran extremely rough. Pulled the new plugs and all of them are black (dry black, I don't think its oil) One code came up P0300 missfire Any ideas? It will not start. Sounds like it is back firing through the intake / air cleaner. I cleaned the AIC and throttle body. Replaced the air filter.

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  • 5 more comments 
  • montereykh Jan 31, 2010

    Are you familiar with this engine? 2.4l does not have a distributor cap, rotor button or plug wires

  • montereykh Jan 31, 2010

    Does this engine 2.4 have an egr valve? If so, where is it?
    What about the timing chain jumping? How can I test it?
    Could there be back pressure in the exhaust? Test?
    Also, there was a squeaking noise that sounded like a belt.
    I had intended to change the serpentine belt this weekend until this happened.
    Crankshaft position sensor? Test?
    I don't like just throwing parts at it. I've read many forums were someone spent a lot of money and time on parts that were still good, but still had the same problem.
    Thanks




  • montereykh Jan 31, 2010

    OK no mass air flow sensor, do you mean MAP sensor?
    No egr valve on this engine. 2000 2.4l OHC
    Loud popping noise and sometimes flames shooting out of throttle body when cranking starter.



  • montereykh Jan 31, 2010

    I removed the hose from the regulator and it is not wet, no fuel.
    Next step?


  • montereykh Feb 01, 2010

    Is a clogged catalytic converter possible? It is really popping(more like exploding) and blowing vapor out the throttle body while cranking the starter. There is spark at the plugs. What controls ign. timing?
    When it was still actually starting (yesterday) at idle, the motor was jumping and shaking alot.


  • montereykh Feb 01, 2010

    Is it possible that the cat. could be plugged?
    How can I check it?


  • montereykh Feb 07, 2010

    Good news! I got it running again. Just wanted to pass on this info for future reference.
    The problem was the ignition coil pack housing. This plastic part connects the coils to the spark plugs.
    I determined the problem with the engine at a rough idle, I removed the electrical connector at each injector (one at a time) on cylinders 1 and 3 there was no change. However, on cyl. 2 and 4 the car would stall. With a long screwdriver to my ear I could hear all 4 injectors ticking.
    I removed the coil packs and bench tested (all good) then with my meter checked the contacts on the inside (coil connection points) to the outside (spark plug connection points) and found that cyl. 1 and 3 were shorted together. Replaced this part and it runs great.
    Not fuel, not timing chain and not cat.


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You have an over fueling problem. The first thing I'd do is check the fuel pressure and regulator if it has one. It isn't that uncommon for the regulator to have a split diaphragm. If this happens, fuel will be drawn directly out of the fuel rail and into the intake manifold. The reason I said: "if it has one", some cars use a direct system with no fpr. You'll have to look along the fuel rail for somthing that looks like the picture I've attached. Pull the vacuum line off it and see if there is fuel coming out of the nipple, if there is, the fpr is bad and you've found the problem. The misfire code is likely being caused by the over fueling but it would probably be a good idea to change the plugs once this is resolved. Let me know what you find and if that's not it I'll do some further checking.
Dave

Posted on Jan 31, 2010

  • Dave  C
    Dave C Feb 07, 2010

    So you found the problem by benefit of having the car in front of you. Good for you, but you didn't need to give all that helped, a crappy rating just because we were not that fortunate. You may want to consider that all the input you received helped lead you in the right direction and consider being a little more grateful.

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Hello sounds to me like it could be a stuck egr valve that should have thrown a code though its probalby the fuel preesure regulator that would give you the black plugs right away just remove the small vac hose and turn on key and look at the regulator to see any fuel coming out of it also check fuel pressure i would should be over 30 psi to even run at all .the egr would give you the back firing also .hope this helps Thunderboltz

Posted on Feb 01, 2010

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  • lintner randy Feb 01, 2010

    if its poping like that pull the plugs and check engine compresson before you start throwing parts at it if the timming jumped youll see uneven numbers like 60-30-110

    and 20 psi

  • lintner randy Feb 01, 2010

    also the way you check the cat with a vac guage should have 3 to 5 inches of vacumm wile cranking also tap cat with your hand listen for inside rallteling if it is just remove and see if it runs .

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I have a 2000 chavy cavalier z2.4 dose the samething. when I came to a traffic light or stop it stalled or last i hit the brake and hit the gas. but if i let go the gas it stalls. but i get up rpms it runs great. just Idle is the problem. I just got the code check and it said one of the ignition coil is bad but i didnt get a eng light ether what will make this happen

Posted on Sep 06, 2012

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It sounds like the mass air flow,even though it is not showing up in the codes,also,the fuel injectors may need cleaning.Make sure the air cleaner is not dirty,and the mass air flow is clear of any debris,and the intake hose has not have a hole in it.

Posted on Jan 31, 2010

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  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jan 31, 2010

    Forget the air filter ,sense you have replaced it.Also,I wanted to mention,if the e g r is staying open,it would cause this.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jan 31, 2010

    Crank shaft sensor is most likely not the problem,if timing chain is stretched ,then engine front tear down is the only way to tell.The mass air flow sensors are bad to do this on the quad 4 engine,and act just like yours.Try looking for a pip off the exhaust tied into the intake,this will have the e g r valve.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jan 31, 2010

    There is a e g r valve ,but only available at dealer,the mapp sensor is not the problem,if the e g r valve is not the problem,then it has jumped time.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jan 31, 2010

    If the e g r valve is stuck open,then this would cause the problem,but it sounds like it has jumped time.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jan 31, 2010

    If the e g r valve is stuck open,then this would cause the problem,but it sounds like it has jumped time.


  • Ronny Bennett Sr.
    Ronny Bennett Sr. Feb 01, 2010

    You will have to remove the cat,or maybe the 02 sensors so the exhaust can excape ,if you do this,just ground the o2 sensors to something,if the car runs better,then this is the problem,if it does not,then the timing chain has jumped.

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  • 1,077 Answers

Sounds like ignition system is causing the problem. Firing the spark plugs off at the wrong time making it run rough. I would look at the distributor cap, rotor, and spark plug wires. Change them out if it's old as the car.

Posted on Jan 31, 2010

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