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Old 02-21-2005, 09:40 PM   #1
jmedlin6
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Default 2000 LS1 2.2L Misfire


Ok so here it goes. I bought my 2000 LS1 used. All recalls have been done to the car. *Even the one where they replaced the engine*

Here is my issue. I am having an intermintant misfire. I am also getting poor gas mileage. There is no check engine light! I have replaced the following items:

* Fuel Filter
* Air filter
* Upstream O2 sensor
* Ignition Coil 2nd time *it was replaced before w/ the recall*
* New plugs
* New plug boots
* Down stream O2 was replaced a few months back *check engine light w/ this one*
* Air Intake Temp Sensor
* Knock Sensor
* MAP Sensor

My mechanic hooked an OBDII up to it and we drove around. All of them would misfire sometimes. Usually when we were stationary #3 would misfire. It usually doesn't miss unless I am stopped at a light, the car is in drive and the A/C compressor is on. (I am thinking it us just making a greater load and causing the engine to miss easier)



Also if I sit at the light and I give my car alittle gas and rev the engine up, it is smooth and won't mis. Anyone have any ideas?

This is driving me crazy!

Oh and Saturn checked it out and said everything was ok!

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Old 02-22-2005, 09:25 AM   #2
Artificialist
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Poor MPG?
Could you need a new catalytic converter?
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Old 02-22-2005, 01:59 PM   #3
PurdueGuy
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Quote:
Originally Posted by Artificialist
Poor MPG?
Could you need a new catalytic converter?
That's what I was starting to think, too. Sounds simmilar to a problem posted on saturnspeed, and so far it is being indicated that it's the cat.
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Old 02-22-2005, 02:03 PM   #4
jmedlin6
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Default CAT

How can I test and be sure that it is the CAT. I don't want to spend money on something I don't need. I don't understand how it could have gone bad so quickly. The car only has 54K miles on it!
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Old 02-22-2005, 03:05 PM   #5
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http://saturnspeed.com/yabbse/index....threadid=21966
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Old 02-22-2005, 08:49 PM   #6
jmedlin6
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Default cat

Can anyone give me a round about price for a cat? How much do you think installation is. I'll check it when the weather is warm to see if it has a nice hollow sound to it. I did however run some seafoam through the car and it seems to be running alittle better.
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Old 02-23-2005, 02:44 AM   #7
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You don't say what mileage you have on the car so I don't know if you may have every had it in to Saturn for a major service where they may have reprogrammed the PCM. That may be worth considering having done. The updated PCM programs may have a programming fix for the miss.
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Old 02-23-2005, 05:06 AM   #8
jmedlin6
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Default vacuum line?

Quote:
The car only has 54K miles on it!

Does anyone think it could be a vacuum line? It seems like as soon as I turn the heater on with or without (sometimes) the a/c compressor on. do they have computer upgrades for my PCM?
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Old 02-24-2005, 03:19 AM   #9
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As I said. Most likely an updated PCM program will fix.






Idle Vibration While Vehicle Is In Gear with Engine at Operating Temperature and A/C Off #01-T-22 - (Apr 16, 2003)

Idle Vibration While Vehicle is in Gear with Engine at Operating Temperature and A/C Off (Install Service PCM Calibration, if Required)
2000-2001 Saturn L-Series vehicles equipped with L61 (4 cyl) engine and automatic transaxle MN4.

Condition
Some customers may comment about an engine vibration at idle with the transaxle in gear, engine at normal operating temperature, and air conditioning Off.

Cause
This condition is caused by engine vibration being transmitted into the body of the vehicle due to insufficient commanded idle speed.

Correction
Reprogram the PCM with the new PCM Calibration as detailed in the following table in this bulletin.

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Old 02-24-2005, 11:39 AM   #10
jmedlin6
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Default pcm

ok good. My car goes back up to Saturn on Monday. I def. will ask them to do that.
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