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1993 Mitsubishi Eclipse car running poorly

Tiny
MARQUIS.PEAY
  • MEMBER
  • 1993 MITSUBISHI ECLIPSE
  • 4 CYL
  • AWD
  • MANUAL
  • 95,000 MILES
My car check engine light came on said o2 sensor upstream malfunction but before I changed it the car would run fine until it heated up then it would idle funny once the engine warmed and die on me every time I came to a complete stop it a 5speed manual. Now heres the weird part I changed the o2 sensor but with every new sensor I put in the car either wont start or runs like miss firing and idiling poorly cant even drive it why with every sensor I try it runs like worse but when I put the bad sensor in it runs fine before it warms up
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Sunday, October 24th, 2010 AT 9:42 PM

6 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the idle speed controller, Mass air flow and throttle position sensor-also clean out the EGR and PCV valves
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Sunday, October 24th, 2010 AT 10:14 PM
Tiny
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Well my question is how come when I put the old o2 sensor in the one thats giving me the check engine light it satrts up perfectly and runs but it does idle a little high but stil runs and drives until engine warms up then it starts to shut off when I come to a complete stop
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Sunday, October 24th, 2010 AT 10:20 PM
Tiny
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Well my question is how come when I put the old o2 sensor in the one thats giving me the check engine light it satrts up perfectly and runs but it does idle a little high but stil runs and drives until engine warms up then it starts to shut off when I come to a complete stop
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Sunday, October 24th, 2010 AT 10:24 PM
Tiny
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  • MECHANIC
  • 75,992 POSTS
The oxygen will not cause an engine to stall if there's a problem to it, it will cause the engine to run rich that's all its gonna do-

Why don't you check the voltages on it if its switching accordingly-could be the computer itself, wrong type O2 sensor
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Sunday, October 24th, 2010 AT 11:41 PM
Tiny
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Im just confused because the o2 sensor thats throwing the code seems to be the only one that makes my car start and run somewhat decent I just dont get why when I put a new one in you would think it would run better but its runs worst its weird
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Sunday, October 24th, 2010 AT 11:50 PM
Tiny
NIVRE
  • MEMBER
  • 1 POST
Hi I'm Ervin and, I have a mitsuvichi eclips GST 1995. The problem its that RPM gage up and down when it turns on and, I have to keep aselereting or it will turn off by it self, what can, I do
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Tuesday, October 2nd, 2012 AT 9:32 PM

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