2000 lesabre limited no spark on 1 and 4 (fixed) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-17-2011, 10:30 PM   #1
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Default 2000 lesabre limited no spark on 1 and 4 (fixed)

I have a 2000 buick lesabre limited with the standard 3.8 series II engine.
just the other day it started running very rough at idle loss of power and a constant miss.
i have replaced the air filter the plug wires the spark plugs and 2 of the coils
i still get code p0300. i have steady vacume .fuel pump is only 4 month old
no fuel leaking from regulator my injectors all have the same resistance within a ohm
or 2 .When the car is running i pulled each injector connector off one at a time
cyl 1 and 4 made no change to the engine. so i then checked for spark on all cyl. againe
no spark at 1 and 4 the other four cyl have spark. i then pulled the coil for 1 and 4 off it is a new coil at the icm i get 12 volts at this coils location but no switching signal.So the is running on 4 of 6 cyl .Any body have any ideas could this be the ICM.
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Old 07-17-2011, 10:40 PM   #2
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I would pull the coil for 1 and 4 and one of the others that you know is working and check the voltage at each prong on the ICM and if your low on the spot for 1 and 4 replace the icm
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Old 07-17-2011, 10:52 PM   #3
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I have 12 volts at coil 1and 4 location on the ICM but no switching signal at that location.
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Old 07-18-2011, 08:19 AM   #4
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usually when the icm fails none of the cyl. have spark, but i cant think of anything else it may be. if four are working i would think everything to that point is fine.
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Old 07-18-2011, 09:07 AM   #5
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Sounds like the ICM may be bad. Generally it will effect all coils, but not always.
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Old 07-20-2011, 08:18 PM   #6
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Default Found the problem

Thanks for everybodys input the problem was the icm it would run on cyl 2 3 5 and 6
no spark on cyl 1 and 4 .I pulled one off a 2001 impala at a local junk yard the car ran better immediately the flashing check engine light stoped then after about a hour drive the solid check engine light that was on forever whent out on its own .That icm must have been failing
for quite some time

Thanks again Dan
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Old 07-20-2011, 09:34 PM   #7
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Good to hear. I'll mark this as fixed.
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