Question about 1989 Buick Electra

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I have a 89 buick electra 98000 miles I failed emissions for high co at idle I put a obd1 tester on it it showed vehicle was not going into closed loop I replaced oxygen sensor it then went into closed loop took it to inspection failed again for same thing I hooked obd1 it was not going into closed loop I got another sensor hooked it up it went into closed loop after 1 minute it went into open loop again for about 20 seconds then it went back into closed loop I am taking it back to inspection in N.J. it shows no codes no check engine lite any help would be appreciated if I fail again

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  • Buick Master
  • 1,413 Answers

To stay in close loop o2 sensor have to be hot
and the converter catalyst is the one who keep the heat......
converter is it factory or never been change.
with scanner obd1 you should see the voltage variation of o2 sensor. it should go from lean to rich . .500mv is the middle then under .500mv is lean and over it is rich.......with this information ecm correct the fuel delivery
hope it helps

Posted on Sep 29, 2013

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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leethedeuce

Lee A.

  • 4472 Answers

SOURCE: code po480

Do both fans work for sure? You may want to replace the fans runs anywhere from 140$ up to 250$ depending on the brand.
Keep me updated.
Thanks,
Lee

Posted on Jun 30, 2008

Anonymous

  • 1605 Answers

SOURCE: 1995 Buick LeSabre hesitating.

try change the fuel filter.
and sure there is no abstraction in the air flow from the air filer to the air mixture intake.

Posted on Oct 15, 2008

Anonymous

  • 160 Answers

SOURCE: High Idle Problem

did you replace the iac motor or the tps , iac is the idle air control and the tps is the throttle position sensor

Posted on Nov 12, 2008

Anonymous

  • 365 Answers

SOURCE: I have a 2000 buick lesabre. The fix engine soon

It NEVER was the camshaft sensor! Unless, you've removed the engine lately, which I doubt.
RUN to Advance Auto Parts and buy a can of "SeaFoam" and add to your gas tank per instructions...drive at least 100 miles and the problem should go away...IF it doesn't you'll have to replace the O2 sensors in the exhaust system...Any good mechanic should be able to do this for much less $$ than the dealership DO NOT go to the dealer for repairs!
Good Luck

Posted on Jun 22, 2009

Anonymous

  • 158 Answers

SOURCE: 2002 Buick Century Code P0420

Sounds as if yoou are actually having a fuel system problem.You need to rreplace the fuel filter and then check the fuel pressure. You should have around 50 psi. If the fuel filter stops up it will cause the exhast to starve for fuel and can damage a catalyst converter. You can get the fuel filter for about 15 dollars at any local parts house.

Posted on Jul 02, 2009

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