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Old 06-12-2018, 08:43 PM   #1
vikasevan
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2001 SL2
2004 VUE 3.5L
Roll Eyes 2005 Saturn ION misfire and it sputters

2005 Saturn ION manual 197k miles

It starts and runs in idle ..does not overheat
I can drive it in neighborhood but I can not go on road ..
i.e. can not go pass 35 mph..

I believe after 20 mph it sputters when accelerator is pressed

recently changed spark plugs and coil pack but no change


Where do you think problem is ?

Do you think its fuel pump or fuel filter or something else?

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Old 06-13-2018, 03:57 AM   #2
ruley73
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2007 ION-2 Quad Coupe
Default Re: 2005 Saturn ION misfire and it sputters

Is your check engine light on? If so, get your car scanned for codes and post them here.

Without knowing anything else, I suspect that your catalytic converter is plugged. You can temporarily remove the upstream oxygen sensor to see if it runs any better. If it does, the converter is definitely plugged.

...
2007 Ion 2 Quad Coupe 5-speed manual 177K miles
2007 Chevy Equinox LT 183K miles

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Old 06-13-2018, 11:32 PM   #3
vikasevan
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Default Re: 2005 Saturn ION misfire and it sputters

Quote:
Originally Posted by ruley73 View Post
Is your check engine light on? If so, get your car scanned for codes and post them here.

Without knowing anything else, I suspect that your catalytic converter is plugged. You can temporarily remove the upstream oxygen sensor to see if it runs any better. If it does, the converter is definitely plugged.
Last time I checked it was misfire code ..nothing else but it was checked when sputtering problem was not there. After sputtering started ..I have not checked code ..neither I can because I dont have this car.. I am considering buying it.

You said cat convert but it is also possible ..it could be fuel pump or filter?

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Old 06-14-2018, 02:02 AM   #4
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2007 ION-2 Quad Coupe
Default Re: 2005 Saturn ION misfire and it sputters

Quote:
Originally Posted by vikasevan View Post
Last time I checked it was misfire code ..nothing else but it was checked when sputtering problem was not there. After sputtering started ..I have not checked code ..neither I can because I dont have this car.. I am considering buying it.

You said cat convert but it is also possible ..it could be fuel pump or filter?
It's possible that the fuel filter is partially clogged or the fuel pump is weak, but it is far more likely that the catalytic converter is plugged. There's no way to tell for sure without further testing and troubleshooting.

...
2007 Ion 2 Quad Coupe 5-speed manual 177K miles
2007 Chevy Equinox LT 183K miles

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Old 06-14-2018, 12:45 PM   #5
vikasevan
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Default Re: 2005 Saturn ION misfire and it sputters

What are causes of misfire in this cars?
Seller already replaced spark plugs and coil pack?

how can I diagnose it?

could it be head gasket? or one cylinder is shot?

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Old 06-16-2018, 04:06 PM   #6
ruley73
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2007 ION-2 Quad Coupe
Default Re: 2005 Saturn ION misfire and it sputters

Quote:
Originally Posted by vikasevan View Post
What are causes of misfire in this cars?
Seller already replaced spark plugs and coil pack?

how can I diagnose it?

could it be head gasket? or one cylinder is shot?
The ignition module is a part that commonly fails. Unfortunately, there's no way to confirm it's bad without replacing it.

...
2007 Ion 2 Quad Coupe 5-speed manual 177K miles
2007 Chevy Equinox LT 183K miles

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