1987 ASTRO 4.3, FAILED IMISSIONS AT IDLE

1987 ASTRO 4.3, FAILED IMISSIONS AT IDLE

Postby DON1 [OP] » June 2nd 2009, 2:25am

FAILED EMISSIONS TEST AT IDLE, OK AT CRUISE, NEW EGR, IAC, MAP, INJ, AND TUNE UP, NEED ADVICE
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DON1
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Fueling (Empty tank)
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Re: 1987 ASTRO 4.3, FAILED IMISSIONS AT IDLE

Postby mikebenghp » June 2nd 2009, 3:14am

anyway you can post in what area you failed? i think in indiana its hydrocarbons, carbon monoxide and nitrogen oxide. Failure in different areas can sometimes mean different things. Also, if you're just barely not passing there are different things you can do. The thing I've found that helped most was getting the vehicle up to highway speeds, 65-70mph, for a good ten to fifteen minutes then go directly to the test site.
92 CL EXT 190k rebuilt motor and trans. Runs like a champ. Quiet, clean and dependable.
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Fueling (1/4 tank)
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Re: 1987 ASTRO 4.3, FAILED IMISSIONS AT IDLE

Postby mikebenghp » June 2nd 2009, 4:48am

also, check for vacuum leaks.
92 CL EXT 190k rebuilt motor and trans. Runs like a champ. Quiet, clean and dependable.
mikebenghp
Fueling (1/4 tank)
Fueling (1/4 tank)
Years of Membership: mikebenghp has been a member for 11 full yearsmikebenghp has been a member for 11 full yearsmikebenghp has been a member for 11 full yearsmikebenghp has been a member for 11 full yearsmikebenghp has been a member for 11 full yearsmikebenghp has been a member for 11 full yearsmikebenghp has been a member for 11 full yearsmikebenghp has been a member for 11 full yearsmikebenghp has been a member for 11 full yearsmikebenghp has been a member for 11 full yearsmikebenghp has been a member for 11 full years
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Re: 1987 ASTRO 4.3, FAILED IMISSIONS AT IDLE

Postby ally_g » June 3rd 2009, 3:19am

My van is a 1988 GMC Safari 4.3. Last two times I've replaced the exhaust from the catalytic converter back and it has passed the e-test.The first time about four years back the guy who did the test recommended changing the catalytic converter.Only,the muffler and exhaust pipes looked like they should be replaced too.Incidentally,it failed the first time four years back.Recently a mechanic friend suggested just getting the e-test done and to get a recommendation from the test facility on what they recommended.Only I didn't want to pay out for another test.I replaced everything myself.
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Extra Info: SLE 4.3L V6 RWD


 
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