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Failed Emissions 1991-3.1L

W

wileym1

New member
Hey everyone, Mark here and new to this Grand Prix site. Long story short, I have a 91 Grand Prix LE 3.1L that won't pass emissions. Changed plugs, wires, pcv valve and oil to start with and had it tested for the 2nd time, still won't pass(barely passing). If I post the test results could someone point me in the right direction??? Bought 6 new fuel injectors but haven't changed them yet. Need more info?? Having trouble uploading graphing results! HELP!!

reading standard
HC 1.78 0.80
CO 10.80 15.00
NOx 1.94 2.50
CO2 397.20 n/a
 
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BillBoost37 said:
Not knowing ... I googled it for you
http://www.smogtips.com/failed-high-hydrocarbons-HC.cfm

I'd look right on top of the TB for that typical stupid vacuum line leak.
Click to expand...

Update, checked rubber grommet on top of TB, used some prv sealant without getting in vacuum lines and sealed. Changed all 6 injectors and the O2 sensor, had it tested again (3). Failed miserably. HC and CO I believe went through the roof but NOX was under limit. Time and money are hard to come by right now. Any other suggestions??? Thanks for you input.

Mark
 
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