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Old 01-30-2009, 09:36 PM
 
Join Date: Jan 2009
Posts: 11
Default 99 Galant po300

Replaced valve cover gasket and spark plug tube seals. Tubes were oil soaked. Two weeks later got a misfire code (po300 random misfire). Replaced plugs and still have a misfire code after car gets to operating temp on freeway. Mainly after stop and go. Tach is also jumping around and sometimes dropping to zero.
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Jeff Larimer
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Old 01-31-2009, 12:14 PM
dsm1990gsx's Avatar
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Default RE: 99 Galant po300

Did you replace the spark plug wires too?
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Old 01-31-2009, 07:03 PM
 
Join Date: Jan 2009
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Default RE: 99 Galant po300

I have not replaced the wires. I checked on them and there are only two. The other two cylinders are the coils. $75 for two wires and $107 per coil. I have been hesitent on replaceing due to price. If I was getting a po301,302,303, or 304 code? I would at least know if it was a coil cyl. or wire cyl.
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Old 01-31-2009, 07:21 PM
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Default RE: 99 Galant po300

Does it idle rough, check for vacuum leaks.
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2004 Ford Escape Xlt
2001 Mercury Sable
1990 Tsi Awd 12.8 @110 s16g @ 22lbs 2.0 60 ft.
-13.3 @114 holset hx35 @ 20lbs *needs new driver mod
1992 galant vr4
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  #5  
Old 01-31-2009, 07:45 PM
 
Join Date: Jan 2009
Posts: 11
Default RE: 99 Galant po300

No, It only has problems 7-10 miles down the freeway after it gets to operating temp. Cold and around town it is fine. Plus, isn't the tach. ran threw the coils? It is jumping around and sometimes stays at zero.
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Old 01-31-2009, 07:45 PM
 
 
 
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01, 99, codes, de, eclipse, endeavor, galant, mercury, mitsub, mitsubishi, oil, plug, po300, sable, spark, tube


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