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Old 09-14-2013, 01:25 PM   #1
puffy802
Scooby Newbie
 
Member#: 309099
Join Date: Feb 2012
Vehicle:
1998 Impreza 2.5rs
red

Default misfire, HELP

1998 rs, runs fine till it starts to warm up, then misfires to the point its barely driveable, esp after rain or when damp out..
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Old 09-14-2013, 05:57 PM   #2
i_c_the_light
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Member#: 88618
Join Date: Jun 2005
Chapter/Region: SCIC
Location: New Zealand
Vehicle:
1994 Legacy
"The Silver Slug"

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Quote:
Originally Posted by puffy802
1998 rs, runs fine till it starts to warm up, then misfires to the point its barely driveable, esp after rain or when damp out..
Oxygen or coolant temperature sensor. Maybe MAF.
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Old 09-14-2013, 06:07 PM   #3
SpamBot
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Join Date: Jul 2011
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Quote:
Originally Posted by i_c_the_light View Post
Oxygen or coolant temperature sensor. Maybe MAF.
Doubtful.

Check your coil and spark plug wires for arcing.
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Old 09-14-2013, 07:08 PM   #4
Johnblaze
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Join Date: Feb 2013
Chapter/Region: Tri-State
Location: NJ
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2013 WRX STi
DGM

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A friend of mine had similar issues in his e30. Turned out he had a crack in his distributor cap. Check your spark plugs.
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Old 09-14-2013, 07:57 PM   #5
puffy802
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Member#: 309099
Join Date: Feb 2012
Vehicle:
1998 Impreza 2.5rs
red

Default

cleaned my maf sensor, misfiring seemed to go away, cleared the cel, still seemed a loss of power esp when trying to accelerate. p0141 came back... rear 02 sensor?
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Old 09-14-2013, 07:58 PM   #6
puffy802
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Member#: 309099
Join Date: Feb 2012
Vehicle:
1998 Impreza 2.5rs
red

Default

plugs and wires and cap APPEAR to be fine, although havent pulled plugs or replaced anything
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Old 09-14-2013, 11:21 PM   #7
i_c_the_light
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Member#: 88618
Join Date: Jun 2005
Chapter/Region: SCIC
Location: New Zealand
Vehicle:
1994 Legacy
"The Silver Slug"

Default

Quote:
Originally Posted by i_c_the_light

Oxygen or coolant temperature sensor. Maybe MAF.
Quote:
Originally Posted by SpamBot

Doubtful.

Check your coil and spark plug wires for arcing.
Quote:
Originally Posted by puffy802
cleaned my maf sensor, misfiring seemed to go away, cleared the cel, still seemed a loss of power esp when trying to accelerate. p0141 came back... rear 02 sensor?
Quote:
Originally Posted by puffy802
plugs and wires and cap APPEAR to be fine, although havent pulled plugs or replaced anything
Investigate rear sensor. Use logic. Ignition problems would occur regardless of operating temperature most of the time.
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Old 09-15-2013, 12:51 PM   #8
puffy802
Scooby Newbie
 
Member#: 309099
Join Date: Feb 2012
Vehicle:
1998 Impreza 2.5rs
red

Default

forgot to mention knock sensor code, replaced it, seems to have fixed my lack of power and hesitation on the throttle, although it still doesnt seem perfect, 02 sensor looks like it needs to be replaced, like the code says, would this affect driveability at all?
thank you everyone for input
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