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  #1  
Old 10-16-2012, 01:38 PM
FSJ Guy FSJ Guy is offline
 
Join Date: Mar 20, 2005
Location: Colorado
Posts: 10,062
EFI and IM240 Emission Testing in CO

I just want to let everyone know that you CAN pass emissions with a GM TBI in Colorado where they do the IM240 testing.

SlushPuppy passed with flying colors, actually!

HC GPM: 0.8212 Limit: 3.0000
CO GPM: 11.1888 Limit: 25.0000
CO2: GPM: 638.7071 No Limits
NOx GPM: 2.3717 Limit: 5.0000

Now if you're familiar with the IM240 test, it's its roller test to simulate actual driving. But they also have a "feature" that shuts down the test if your vehicle is particularly "clean", called Fast Pass. YES, SlushPuppy passed via Fast Pass! (I was watching the screen.)

As always, I had a new gas cap, because they WILL fail you for the entire test if your gas cap fails the pressure test.

Interestingly the form says I passed for an O2 sensor, which I actually DO have, but it's not factory. <shrug> They didn't seem to care about my non-factory dual snorkel air cleaner, however.
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Ethan Brady
1987 Grand Wagoneer, slightly longer than stock.

www.bigscaryjeep.com

Don't mess with me. I once killed a living hinge.
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  #2  
Old 10-16-2012, 02:28 PM
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BGW BGW is offline
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Join Date: Jan 02, 2009
Location: Boulder, Colorado/Bozeman, Montana
Posts: 889
Do you still have your air system connected?
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1991 Grand Wagoneer, Stock, 99k.

My buddy Sam: "...as far as gas money goes Peter's car is as thirsty as an alcoholic on St. Patricks day..."
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  #3  
Old 10-16-2012, 03:50 PM
Blake Blake is offline
Bleedin' Gasoline
 
Join Date: Dec 22, 2005
Location: longmont, colorado
Posts: 2,123
Congrats!

Yes, always, always, always get a brand new gas cap. I've even went so far as to try and reuse last years gas cap by taking it off after I pass and store it until the next time in a zip lock bag, only to have it fail.

So now I just automatically buy a new cap each year.

So did you have your jeep 'refereed' and therefore identified as having TBI, or did you just 'wing it'?

I'm worried about my '88 waggy with it's Howell system. I'm not running any type of air system now.

My other FSJ's have collectors plates and that makes me happy
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  #4  
Old 10-16-2012, 05:43 PM
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BGW BGW is offline
Master Mechanic
 
Join Date: Jan 02, 2009
Location: Boulder, Colorado/Bozeman, Montana
Posts: 889
I'm worried about it when I switch to mpfi. When I first bought my GW, it was missing a small hose for the air system, and one of the monkeys actually found it and failed me for it. Thankfully the Ford computer is able to control the air system with electronic valves so I can keep the "factory emissions equipment" in place.
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1991 Grand Wagoneer, Stock, 99k.

My buddy Sam: "...as far as gas money goes Peter's car is as thirsty as an alcoholic on St. Patricks day..."
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  #5  
Old 10-16-2012, 06:35 PM
FSJ Guy FSJ Guy is offline
 
Join Date: Mar 20, 2005
Location: Colorado
Posts: 10,062
Quote:
Originally Posted by BGW
Do you still have your air system connected?

Yes. It is intact. It blows air into the cat, downstream of the O2 sensor.
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Ethan Brady
1987 Grand Wagoneer, slightly longer than stock.

www.bigscaryjeep.com

Don't mess with me. I once killed a living hinge.
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  #6  
Old 10-16-2012, 06:36 PM
FSJ Guy FSJ Guy is offline
 
Join Date: Mar 20, 2005
Location: Colorado
Posts: 10,062
Quote:
Originally Posted by Blake
Congrats!

Yes, always, always, always get a brand new gas cap. I've even went so far as to try and reuse last years gas cap by taking it off after I pass and store it until the next time in a zip lock bag, only to have it fail.

So now I just automatically buy a new cap each year.

So did you have your jeep 'refereed' and therefore identified as having TBI, or did you just 'wing it'?

I'm worried about my '88 waggy with it's Howell system. I'm not running any type of air system now.

My other FSJ's have collectors plates and that makes me happy

No referee. I just drove in, handed them the keys and drove out $25 poorer, but very happy, nonetheless.

You will need to have the smog pump visually intact.
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Ethan Brady
1987 Grand Wagoneer, slightly longer than stock.

www.bigscaryjeep.com

Don't mess with me. I once killed a living hinge.
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  #7  
Old 10-16-2012, 06:52 PM
Blake Blake is offline
Bleedin' Gasoline
 
Join Date: Dec 22, 2005
Location: longmont, colorado
Posts: 2,123
sweet!
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  #8  
Old 01-08-2019, 08:31 AM
COJEEPBOY COJEEPBOY is offline
232 I6
 
Join Date: Oct 23, 2009
Location: Colorado
Posts: 132
I wonder how the Holley sniper will do in CO I'm currently looking at that as an upgrade, but am worried about emissions. What did you do with your EGR
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