Failed Emissions test
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From: 3rd Rock
Failed Emissions test
Took my 87 BII 2.9 EFI ..in for its yearly emission test, has 93k on it.
As the title suggest, it failed…what I am looking for is an 80 or 90% solution…i.e. most of the time it turned out to be the EGR valve, or 80% of the time it is the _____ ……I know this is a bit nebulous to approach something this way…... however it runs great, gets 19.5 in town and 24.5 on the road day after day after…well you get the idea.. I need any and all ideas you guys/gals might have.
And I appreciate any suggestions.
As the title suggest, it failed…what I am looking for is an 80 or 90% solution…i.e. most of the time it turned out to be the EGR valve, or 80% of the time it is the _____ ……I know this is a bit nebulous to approach something this way…... however it runs great, gets 19.5 in town and 24.5 on the road day after day after…well you get the idea.. I need any and all ideas you guys/gals might have.
And I appreciate any suggestions.
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Did they give you a print out of what the emissions were? If you were high on HC it could mean overrich. High on Nox could mean EGR, etc.
Post them if you have them for more enlightened response from better minds.
Post them if you have them for more enlightened response from better minds.
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FTE Leadership Emeritus
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From: 3rd Rock
Catalytic convert passed
V smoke/emissions passed
V gas cap passed
High speed RPM 2614
HC 68 limit 200
Co 0.86 limit 1.20
CO2 14.5
O2 0.65
Low speed RPM
HC 262 limit 200
CO 0.04 limit 1.20
CO2 15.0
O2 0.66
Operating temp was in the middle (normal)
Hope this helps
V smoke/emissions passed
V gas cap passed
High speed RPM 2614
HC 68 limit 200
Co 0.86 limit 1.20
CO2 14.5
O2 0.65
Low speed RPM
HC 262 limit 200
CO 0.04 limit 1.20
CO2 15.0
O2 0.66
Operating temp was in the middle (normal)
Hope this helps
Postmaster
Joined: Dec 2001
Posts: 3,742
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From: UT
1st thing I would do, especially on an '87 that doesn't have a check engine light, is to pull codes from the computer and see if the computer can see a fault.
Another thought, I don't remember specific numbers, but mine once failed emissions in a similar because the air filter was due to be replaced. Any tune-up like items of that nature that are due to be done may tip the idle HC down for you.
Another thought, I don't remember specific numbers, but mine once failed emissions in a similar because the air filter was due to be replaced. Any tune-up like items of that nature that are due to be done may tip the idle HC down for you.
Fleet Owner
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From: Brentwood,CA
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Mountain Pass
Joined: Sep 2003
Posts: 215
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From: San Diego
Originally Posted by ford390gashog
whats your idle speed set it at a 1000 rpm for the test so you pass then reset it
The catalytic converter burns hydrocarbons that escaped combustion.
When hydrocarbons are too high though, in your test result, CO is almost zero and O2 is low. Maybe there's insufficient oxygen to burn the hydcrocarbons. Is the air filter good? If not that then the cat. may be bad.
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Mountain Pass
Joined: Sep 2003
Posts: 215
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From: San Diego
Originally Posted by plilikoi
It passed on idle so that won't help.
The catalytic converter burns hydrocarbons that escaped combustion.
When hydrocarbons are too high though, in your test result, CO is almost zero and O2 is low. Maybe there's insufficient oxygen to burn the hydcrocarbons. Is the air filter good? If not that then the cat. may be bad.
The catalytic converter burns hydrocarbons that escaped combustion.
When hydrocarbons are too high though, in your test result, CO is almost zero and O2 is low. Maybe there's insufficient oxygen to burn the hydcrocarbons. Is the air filter good? If not that then the cat. may be bad.
Was the engine good and hot when it was tested or had it been sitting a while?
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