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Old 01-19-2012, 11:58 AM   #1
rigo009
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Default Codes U2105, P1780 & P0304 2000 LW2

2000 Saturn LW2 with 120,000 miles. About a month ago the SES light came on steady. About a week later the light would start flashing for a few seconds after the car started moving regardless of whether the car had been warmed up and then the light would go back to staying on. When at stop lights it would idle very roughly and almost stall but it would feel fine while driving. Horse power was noticibly less and MPG was less as well.

I changed the spark plugs and MPG is better but the light still flashes for a few seconds after i put the car in drive and then it stays on. For the first 5 minutes of driving it feels like it's running on 4 cylinders but after that it feels fine. It idles fine now too.

I stopped at autozone this morning to get the codes and this is what they gave me.

I know the P0304 is #4 misfire so I might have to replace the coil pack. Not sure if this has anythign to do with the codes but the coolant also leaks and I have to refill pretty often. Any suggestions?

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Old 01-20-2012, 01:20 AM   #2
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2003 L-Series 3.0L Sedan
Default Re: Codes U2105, P1780 & P0304 2000 LW2

Is this a 4 or 6 cylinder engine? List maintenance done.

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Old 02-02-2012, 01:34 PM   #3
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Default Re: Codes U2105, P1780 & P0304 2000 LW2

V6. Bought it froma dealer with 75K miles.

Only maintenance the dealer did was new brakes. Since then I've only had the O2 sensor replaced but nothing major.

Autozone says the computer is reading misfire cylinder 4. I checked sparkplugs #2, 4 & 6 this morning and #4 is really brown and dirty. #2 and 6 look brand new.

The SES light was not on this morning after I started the car but after 10 seconds of driving it blinked for about 5 seconds and stayed on the rest of the drive. The car started fine and drove fine (40 minute drive).

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Old 02-26-2012, 03:50 AM   #4
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Default Re: Codes U2105, P1780 & P0304 2000 LW2

Went to the junk yard today and got a used coil pack and the SES light went away.

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