Question about 1996 Chevrolet Lumina Mini

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Multipule misfire code

I have a 1996 chevy lumina car 3.1 got the code po300 changed plugs,wires,coils,and control module now it's not reading any codes.when i try to start it won't start any ideas plz .

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Posted on Jan 02, 2017

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keemo68
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SOURCE: ok had a code read po300 changed the coils,control

if your having a drain on the battery there is a short most likely in a relay. what this means is even though every thing on the vehilce is shut off a relay is allowing voltage to flow causing a drain. For example lets say that a dome light appears to be out however in that circuit a relay is stil;l closed so the voltage is allowed to follow through that circuit.. now the easiest way to check for a drain is to have the vehicle running. then turn everything on in the vehicle radio/ac/dome light/etc. then take a test light and hook to the battery. now one by one shut off each function each time seeing if the the voltage rises( it should always rise when you turn off a function). if after all the functions are turned off and your voltage reeading isn';t at least 12.5 volts then remove the positive battery cable while vehicle is still running if the vehicle stalls then the regulater i9nside the altenator is the cause.

Posted on Apr 17, 2009

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jsmes1027
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SOURCE: 2004 cavalier 2.2 vin f

I have expereienced this issue several times on the 2.2 ecotech usually ends up being the ignition module itself. I keep an extra module handy just for testing purposes.

Condition/Concern:
Some customers may comment on a severe engine misfire and a SES Light. Upon inspection, DTCs P0300 - P0304 may be found due to misfires on cylinders 1 and 4 or cylinders 2 and 3.
Recommendation/Instructions: If this concern is encountered, inspect circuits 406 (IC Control for 2/3 Coil) and 423 (IC Control for 1/4 Coil) for an intermittent short to ground or poor connection on either end. Depending on the model, these circuits may short on the AC lines near the AC compressor, on the transmission mount, or on the transmission lines where they enter the transmission. If there is no problem found with these circuits, inspect the ignition control module ground to ensure that it is clean and tight.
If there is no problem found after performing the suggestions above and the SI diagnostics lead to ignition module replacement, replace the ignition module as directed but also replace all of the spark plugs and clean the ignition module ground to possibly prevent future ignition module damage.
Measure the resistance of the ground circuit of the ICM from the harness connector of the ICM to a good ground. This should be 3 ohms.If it is not replace the module.

Posted on Jan 03, 2011

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