Mitsubishi Galant A sporty mid-sized sedan offering the perspective buyer a change from the normal mid-size sedan class.

Help!! po300

Old Aug 4, 2008 | 08:13 AM
  #1  
jay_yrbrgh's Avatar
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Default Help!! po300

cant get this code to go away or the car to quit missing. I did a search and checked the first 10 pages before posting so if it's a repost sorry. I've replaced the coils, plugs, wires, crank position, cam posion, water temp, sencors, timing belt, cam gear. it has no vacume leaks and good compression, plugs read clean. it doesnt always do it, but when it does the tack goes iradic also.
 
Old Aug 4, 2008 | 09:56 AM
  #2  
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Default RE: Help!! po300

Its probably a loose connection some place. Most likely a ground strap.

Are there certain things you can do to make it happen?
 
Old Aug 4, 2008 | 04:04 PM
  #3  
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Default RE: Help!! po300

When does it missfire, when its cold?
 
Old Aug 6, 2008 | 08:20 AM
  #4  
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Default RE: Help!! po300

it'll do at random. cold or warm it doesnt matter. I checked all the grounds and conections and they seem good.. I cant seem to find an ecm localy. anyone have one for sale? now the tach just quits working from time to time.. when the tach doesnt work it doesnt miss.
 
Old Aug 7, 2008 | 07:56 AM
  #5  
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Default RE: Help!! po300

ok new update I removed the cats and it didn't help. also if I unplug the wires from the coil the tach just quits working for about 6-7 blocks
 
Old Aug 8, 2008 | 01:51 AM
  #6  
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Default RE: Help!! po300

More details on your car. Year and engine?


JJ
 
Old Aug 8, 2008 | 07:30 PM
  #7  
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Default RE: Help!! po300

2001 -2.4
 
Old Aug 8, 2008 | 09:07 PM
  #8  
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Default RE: Help!! po300

ok the tach quit working all together but it runs great now. wtf?
 
Old Aug 8, 2008 | 09:09 PM
  #9  
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Default RE: Help!! po300

Does 2001 have cop?
 
Old Aug 19, 2008 | 08:39 PM
  #10  
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Default RE: Help!! po300

what is a cop? I pulled the dash loos and changed the instrument panel with a new tach that didn't help also traced all the wires through the harness and couldn't find a break or short.
 

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