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I have a 2003 olds alero 2.2-4cyl ecotec it misses in park,have replaced ICM& coil,new plugs,rubber spark plug boots,air filter,the rpm guauge is not steady when in park and engine running,the rpm guage is not steady when car in in park and running,the cataylic conv has been done away with,the codes arepo141&po 300,random misfires,could a engine vaccum leak cause it to miss and the missfire

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  • Dina Law
    Dina Law Jan 13, 2013

    how do you ck for a vaccum leak

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: maf?/ missfiring

have the map sensor checked to see if it is within range you say you have codes maf make sure all clamped duct work is tight and not loose clamps .iac motor clean bore if the pintle gets stuck will cause rough idle hesitation even no start conditions scan tools only test the idle air control valve motor not the bore that extends to block varnish gets built up on the pintle and in the bore wich binds the in and out operation

Posted on Sep 12, 2008

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dustyboner
  • 331 Answers

SOURCE: 2000 Pontiac Grand AM trouble code P0300

Im surprised that didn't fix it. On the Quad4 engine its usually a cracked coil housing.
Have you checked:

  • fuel injectors / fuel pressure
  • coolant temp sensor
  • compression - to check for bad head gasket
  • ignition control module
  • EGR system - make sure the valve isn't stuck
  • crank position sensor.
The crankshaft position system variation compensating values are stored in the PCM non-volatile memory after a learn procedure has been performed. If the actual crankshaft position system variation is not within the crankshaft position system variation compensating values stored in the PCM, DTC P0300 may set.

Posted on Oct 15, 2008

BCAS1298
  • 3092 Answers

SOURCE: 2003 chrysler town & country 3.8...P0304 #4

Is the spark plug wet when you remove it, if not check fuel injector, also while you have spark plug out do a cylinder compression test.

Posted on Jan 11, 2010

  • 3 Answers

SOURCE: 2.2 ecotec engine. Code says random misfire. What

did you fix it? if you did what did you do? i have the same prblm thanks!

Posted on Jan 17, 2010

  • 67 Answers

SOURCE: code po 300 keeps coming

Most likely ignition coil or ignition control module problem if problem is spark related.

Posted on Mar 26, 2011

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1 Answer

I have an Oldsmobile Alero GL 2003 & I'm not sure what size the engine is. I needed to know how many plugs are in it & the mechanic told me it takes boots not wires.


if the engine says its a 2.4. then it is a 4 cylinder ( 4 plugs ).on the 2.4 remove the four bolts on the ignition coil cover. pull the idi cover straight up until the boots are off the spark plugs, then set cover aside. if the boots stick to plugs, you can reatach them to coil cover on bottom of idi cover. thats it !! have a good day !!

Dec 07, 2010 | 2003 Oldsmobile Alero

1 Answer

2000 olds alero engine misfire replaced plugs still misses service engine light is on


Check spark plug coil pack's, make sure that there firing, look for spark at end of boot.

Sep 08, 2010 | 2000 Oldsmobile Alero

1 Answer

2003 ford taurus - replaced fuel filter & fuel pump - runs great then starts chugging, RPM's drop, pull over, turn it off and wait about 1 or two minutes, then runs great, only in the heat of...


is the car missing when driving? 2000 and on has coil over plug's there are no wires. Is the check engine light on? if so go to an Auto Zone parts store or one that will scan the car computer for free and get the codes out to pin point the problem. Sounds like the cars miss firing. it could be more than one coil and or plug going bad. Did you replace any coil packs? Bad coil packs are 90% of all miss fires on todays cars and trucks.

Aug 09, 2010 | 2003 Ford Taurus

1 Answer

How do you remove the ignition coil


Each ignition control module (ICM) has the following circuits:
An ignition 1 voltage circuit A chassis ground An ignition control circuit for each cylinder A low reference circuit
The PCM controls spark by pulsing the ignition control circuits to the ICM to trigger the coils and fire the spark plugs. The PCM and ICM are internally protected against shorts to power and ground on the ignition control circuits.

The spark plugs are connected to each coil by a short boot. The boot contains a spring that conducts the spark energy from the coil to the spark plug. The spark plugs are tipped with platinum for long wear and higher efficiency.


Ignition Control Module (ICM) Connectors

248af41.jpg

Fig. Ignition coil locations 2001-2004 4.8L, 5.3L, 6.0L Engines



Removal & Installation
2.2L (L61) Engine
  1. Turn OFF the ignition.
  2. Remove the accelerator cable from the bracket.
  3. Remove the accelerator cable bracket bolt.
  4. Remove the accelerator cable bracket.
  5. Disconnect the ignition control module (ICM) harness connector.
  6. Remove the ICM retaining screws.
  7. Remove the ICM from the ignition coil housing.

To install:
  1. Install the ignition control module in the ignition coil housing.
  2. Install the ICM retaining screws. Tighten the retaining screws.
  3. Connect the ICM harness connector.
  4. Install the accelerator cable bracket.
  5. Install the accelerator cable bracket bolt. Tighten the retaining screws.
  6. Install the accelerator cable to the bracket.

2.2L (Ln2) Engine
  1. Remove the air cleaner outlet from the air cleaner.
  2. Remove the ICM electrical connectors (1) and spark plug wires (2).
  3. Remove the ignition coils bolts (3).
  4. Remove the ignition coils and ICM assembly.
  5. Installation is the reverse of the removal procedure.

2.4L Engine
  1. Disconnect the negative battery cable.
  2. Remove the accelerator cable from the hold down clip.
  3. Remove the cruise control cable, if applicable.
  4. Remove the bolt from the fuel line retaining clip.
  5. Disconnect the 11-pin harness connector for the ignition control module (ICM).
  6. Remove the bolts from the ignition coil and the ICM assembly-to-camshaft housing.
  7. Remove the ignition coil and ICM assembly from the engine.
  8. Remove the screws that retain the housing to the cover.
  9. Disconnect the coil harness connector from the ICM.
    CAUTION When removing the housing from the cover, make sure the ground strap stays in place.
  10. Remove the housing from the cover.
  11. Remove the screws that retain the ICM to the cover.
  12. Remove the ICM from the cover.

    9f8592c.jpg
    Fig. Removing the ICM from the camshaft cover

To install:

CAUTION DO NOT wipe grease from the module or coil if the same module is to be replaced. If a new module is to be installed, a package of silicone grease will be included with the module. Spread the grease on the metal face of the module and on the cover where the module seats. This grease is necessary for module cooling.
  1. Install the ICM to the cover.
  2. Install the screws that retain the ICM to the cover.
  3. Install the ground strap, if necessary.
  4. Connect the ignition coils connector to the ICM.
    CAUTION When installing the housing to the cover, make sure the ground strap stays in place.
  5. Install the housing to the cover.
  6. Install the screws that retain the housing to the cover.
  7. Install the spark plug boots and the retainers to the housing, if necessary.
  8. Install the ICM assembly to the engine while carefully aligning the spark boots to the spark plug terminals.
    CAUTION The ICM cover bolts must be installed using isolator washers with the rubber side facing down.
  9. Install the bolts that retain the ICM assembly to the camshaft housing after coating the bolt threads with LOCTITE, or equivalent. Tighten the bolts to 16 ft. lbs. (22 Nm).
  10. Connect the ICM 11 pin harness connector.
  11. Install the bolt to the fuel line retainer clip.
  12. Install the accelerator cable into the hold down clip.
  13. Install the cruise control cable, if applicable. Connect the negative battery cable.

Hope this help (remember comment and rated this).

Apr 05, 2010 | 2000 Chevrolet Blazer

1 Answer

2004 Alero...Car will not start now. Changed fuel filter and made sure I have gas to the motor. I chacked the codes and have 1 saying a misfire in all cylinders. Checked for spark and found I have spark in...


did you check the ICM (ignition control module) that's what the coil pack sits on. Inspect if for wire damage and you can remove the ICM and have it tested at Auto Zone or Parts Source free of charge.
Thank you for using FIxya and good luck

Mar 26, 2010 | 2004 Oldsmobile Alero

1 Answer

How do I change the spark plugs on a BMW 523i engine and what is the correct spark gap?


The spark plug change is very straight forward. Basically, you remove the plastic valve cover trim panel, unplug the harness plugs from each of the ignition coils, remove the two nuts securing each coil, pull the coil up. The rubber spark plug connector boot should come up with the coil. You can now remove the spark plugs.

The spark plugs are not gappable. Install them as they come out of the box.

Replace the rubber connector boots at the same time, these wear out and can cause miss-fire problems.

Note that if you find oil in the spark plug wells, the valve cover gaskets must be replaced. Not only does this make a mess, but it deteriorates the boots and also causes miss-fires.

See the DIY article in the Spring 2005 issue of the Bavarian Autosport - Fast Times newsletter (see link below):

http://www.bavauto.com/shop.asp?HC1=0&HTarget=sc_fasttimes.asp&HCY=&HCM=

Contact Bavarian Autosport for the spark plugs and connector boots (and valve cover gaskets) at 800-535-2002, or order online.

Aug 31, 2009 | 2001 BMW 5 Series

1 Answer

Spark plugs


The spark plugs on the cavalier are under the 2.2 ecotec panel located on the top of the engine. There are no spark plug wires to deal with. The electronic coil pack directly attaches to the plugs with rubber seats like in a spark plug end. Then you use a deep socket ratchet to get the plugs out. Use anti-seize compound when replacing the plugs.

Jun 30, 2009 | 2003 Chevrolet Cavalier

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