Question about 1998 Chevrolet Cavalier

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1998 cavalier 2.2 missing got codes of 0172 and 0300 any idea's

Missing and smells like flooding out

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  • cheinze78 Dec 29, 2008

    the other code is 0300 the codes ore misfiring and to lean i need to know where i should check to make repairs

  • cheinze78 Dec 30, 2008

    is there a way to test the coil packs without replacing them first

  • cheinze78 Jan 01, 2009

    changed plus wires fuel filter and checked all cylinders for spark looks good, still runs like **** also ran compression check all was 170 -200 i also replaced temp sensor no luck yet plugs are black not wet with gas

  • cheinze78 Jan 02, 2009

    i had a fuel pressur tester here , i could not find a shrader vavle to test with, don't really want to buy a manual for a car that will be sold as soon as it is repaired

  • cheinze78 Jan 02, 2009

    no not hardly austin probably 1300 miles away , i just had someone else over with a different scanner he got a p0118 code coolant temp. circuit high input , i have already changed the coolant temp. sensor made no difference any thing else that would send this code

  • cheinze78 Jan 02, 2009

    i had changed the coolant temp. sensor a couple of days ago and know i didn't clear memory but i was told it still should work even if memory was't cleared as far as the other tester your talking about my abilities are limited when it comes to electronic testing, is there a easy way to test the map sensor i was told on some vehicles if you unplug it the motor will run better if bad

  • cheinze78 Jan 03, 2009

    i have a ohm/voltage tester i'm just lost when it comes to running some of the test i find to run , now if someone could put it into laymans terms i might be alright. also i unplugged the m.a.p. sensor while it was running this morning it defintly made a difference in the way it ran it seemed to smooth out but when i tried to rev it up it still had some mis to it would that be normal if sensor was unplugged could i be onto something. i hope you are near your computer to respond because i almost got myself talked into buying a map sensor

  • John Weathers
    John Weathers May 11, 2010

    I need your VIN nd give me all the codes that were stored in the ECM. Besides P0172 what was the other codes.



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  • 409 Answers

10th character of the Vin is needed to use this site go here and translate your code.

Posted on Dec 29, 2008

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  • John Weathers
    John Weathers Dec 29, 2008

    First Remove and check your spark plugs and wires. You have 2 coil packs. Either one going bad could cause a misfire. A bad injector could cause a misfire. The rule of thumb is to make sure your ignition system is 100 percent before looking at the fuel injection system. 
    When was your last tune up? A fouled out spark plug or bad plug wireor a bad coil pack could cause a rich and flooding fuel smell condition since fuel is still being sent into the cylinder but not burning.
    If your last tune up was done over 60,000 miles ago I would replace the plugs and wires clean or replace air filter and change the oil and filter. A new fuel filter wouldn't hurt either

  • John Weathers
    John Weathers Dec 30, 2008

    Take a good spark plug and wrap some wire around the threads and ground the other end of the wire. Now pull off a spark plug wire and put the test plug into it. Now have someone crank the engine while you look for the spark at the plug. You will have to do this for each spark plug wire. That should pinpoint if you have a bad coil and which one it is. The code for cylinder misfire didn't say which cylinder it was?

  • John Weathers
    John Weathers Jan 01, 2009

    If the plugs are black they are fouled they don't have to be wet with fuel. If they are black they have to be replaced. Have you checked your fuel pressure regulator? if you go to this site you can buy a subscription to alldata'a service manual for your car. It is good for 1 year and has test procedures, component locations, wiring diagrams and all kinds of repair info. It is well worth the money if you plan to do your own repairs. Check it out. 

  • John Weathers
    John Weathers Jan 02, 2009

    I didn't know you were planning to sell it. Sorry. There are a few thngs that can cause a rich, plug fouling situation. The MAF or MAP sensor, Fuel presure regulator, 02 sensor, and bad spray patterns from the injectors. It's funny because early in your comments it says the codes meant misfire and a lean condition. But later you state that the plugs were black which indicates a rich condition, I can imagine you are pulling your hair out by now and I would really like to help you solve this problem.
    We really need to know what the fuel pressure is. 
    What city are you in? Wouldn't happen to be Austin TX would it?

  • John Weathers
    John Weathers Jan 02, 2009

    Does it still send P0118 ater replacing the sensor and clearing the memory?
    Do you have a DVOM. Test you MAF sensor. It works off a 5 volt ref signal from the ECM. Make sure you have the 5 volts there and that the voltage fluuates as youincrease and decrease RPM's.

  • John Weathers
    John Weathers Jan 03, 2009

    You are right about it running with the code still in the ECM. Some cars will run a little better with the MAF unplugged. All you can do is try it. I'm afraid I won't be able to help you if you don't have a 12 volt test light, Digital Volt Ohm Meter (DVOM) and a fuel pressure test set. I can tell you how to run all the test but without the proper tools you can't do anything but grab at straws. Sorry.

  • John Weathers
    John Weathers Jan 04, 2009

    Yes go ahead and replace the MAP sensor. The reason it would not tach up and missed was because the sensor was unplugged. If it smoothed out with it unplugged and idled better you are onto something. Replace it for sure.



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I saw what you replaced, but, didn't see any testing? Use a gage and check proper fuel pressure. Also, see if pressure will hold for a bit, everything off. If the pressure drops like a rock, you have a fuel pressure leak. Check fuel pressure regulator vacuum line, if it has gas in it, the regulator is faulty. Could have leaking fuel injector or the fuel is leaking back through the fuel pump.
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