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 smog
#803607
04/08/07 08:50 AM
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Joined: Mar 2007
Posts: 27
OP
Getting the Wheeling Fever
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I have a 1989 4 runner that won't pass smog. Ive replaced the mass air flow sensor , the TPS ,cap & rotor,spark plugs PVC valve and a BOSCH universal O2 sensor. I have also run injector cleaner thru the gas tank & checked the EGR system and it is working. The smog check was - @ 2500 rpm the limit for the HC ppm 220 and the truck read 90 (pass) the CO% limit is 1.20 the truck read 1.16 (pass). The idle test @ 796 rpm is HC ppm limit is 220 the truck read 253 (fail) and the CO% limit 1.20 and the truck read 4.44 ! (fail)!!! . What could cause this ? should I bump the idle speed up to 1000rpm ? Would retarding the timing 2 deg help ? Any help is welcome . <img src="/forums/images/graemlins/confused.gif" alt="" />
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Re: smog
[Re: rollin]
#803608
04/08/07 11:20 PM
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Joined: Aug 2001
Posts: 2,941
J Roll Me Over
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Ditch the Bosch sensor... Get a Denso.
The Bosch sensor does not protrude enough into the exhaust stream to get an accurate reading, and will allow your engine to run rich.
Other than that, the Cat could need replacement. I am still leaning towards the Bosch sensor.
"A young man who does not have what it takes to perform military service is not likely to have what it takes to make a living." - John F. Kennedy
Proud owner of an 88 Montero (with a blown engine).
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Re: smog
[Re: rollin]
#803609
04/09/07 06:22 AM
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Joined: Apr 2007
Posts: 7
Need a Spot
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I had a faulty coolant temp sensor that caused bad readings at smog check.
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Re: smog
[Re: SoCalRunner]
#803610
04/10/07 04:41 AM
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Joined: Mar 2007
Posts: 27
OP
Getting the Wheeling Fever
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Thank you , was there only one temp sensor ?
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Re: smog
[Re: DRTDEVL]
#803611
04/10/07 04:42 AM
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Joined: Mar 2007
Posts: 27
OP
Getting the Wheeling Fever
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Thank you, I will try that.
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Re: smog
[Re: rollin]
#803612
04/10/07 05:03 AM
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Joined: Oct 2002
Posts: 15,887
Toyota & Classifieds Moderator
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http://www.walkablecommunities.org/Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote. **ubi apis- ibi salus**
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Re: smog
[Re: kewlynx]
#803613
04/11/07 01:06 AM
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Joined: Mar 2007
Posts: 27
OP
Getting the Wheeling Fever
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Re: smog
[Re: rollin]
#803614
04/16/07 04:02 AM
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Joined: Mar 2007
Posts: 27
OP
Getting the Wheeling Fever
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whooohooo it passed the 02 sensor worked!!! Thank You all so much ! <img src="/forums/images/graemlins/smile.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" />
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