Emissions help, idle test

[The Dread Pirate Fisher]

So I got around to dong the safety and emissions. Passed safety, failed emissions. I failed on the idle test, it's the HC count, I'm more than double. See attached pic for sheet reading.

Now in my searching, some say the HC is from being too rich, while I read a post by "bronze" that say it could also be from too lean at idle.

I have an accufab AFPR, had no idea it was there since I just bought the truck, well there was no way to tell what PSI I was at. So I got a rail mounted gauge, it's showing 35psi while idle vacuum ON.

Another symptom I noticed is that my idle is currently at 700rpm, but sometimes just wants to die, and sometimes does, going from D to reverse it stumbles hard.

I'm also not getting full boost under WOT. It varies, at 8 the goes to 10-11, as seen on my autometer boost gauge. But this might be a different issue.

The injectors I found to be not stock but green collar D1720AA which I believe to be BuickGN injectors. Unsure of there flow rating. Truck is for the most part stock (intake, turbo, headers, chip, ect)

Unsure of the spark plugs, and timing, I was told they are stock and timing is stock.

So us my fuel pressure the culprit?

 

[TeeTopZ]

Re: Emissions help, idle test

You need to check pressure with the vacuum off. Let us know and we can go from there. If you have larger injectors, your chip should match that. Verify it that it is stock.

 

[jaystcb]

Re: Emissions help, idle test

220... wow. what i would give. CA is 100.

Might want to cover your licence and vin from internet spys.

 

[0966Sy]

Your chip is probably based on a fuel map for another injector (stock). Look at your chip and confirm correct bin and change injectors accordingly. A slightly larger injector may provide more fuel but without the correct program could ruin idle/cruise

 

[The Dread Pirate Fisher]

Re: Emissions help, idle test

vacuum off 42.5/43

when i did the heater core replacement, the ECM came out, it appeared to have never been opened, i based that on the factory foam and seal thats still on it, would have had to have been removed if it was messed with.

 

[The Dread Pirate Fisher]

Re: Emissions help, idle test

side note.. i ordered a chip from TurboTweak yesterday based on the injectors that are on the car now.

previous owner told me the CAT was replaced and has less than 1000 miles on it.. O2 sensor appears new, but i could change that as well.. i have also ordered an AEM Uego wideband today

 

[Turbotoyz]

Re: Emissions help, idle test

My truck failed the same. The "sniffmaster" told me that its running too lean at idle when it fails HC.

 

[The Dread Pirate Fisher]

Re: Emissions help, idle test

so possible vacuum leak? it appears the previous owner did some vacuum line corrections.. im starting to call this truck the (ziptie) truck cause everything has zip ties on it.. lol... ill do a double check for the vacuum lines and see what i come up with..


i also searched the injectors and it appears they are Lucas 30#'s

 

[Turbotoyz]

Re: Emissions help, idle test

After it failed, I put the cat back on and it failed by 6 bloody points. I didn't do anything else besides the cat. I haven't had a chance to mess with it since. I'd bet if I took 20 mins I could get it to pass, but I never drive it. If I were you I would check for vac leaks, but thats just based off what the sniffmaster told me.

 

[MadMike]

Re: Emissions help, idle test

If its too lean causing to fail. Why not fatten it up a pounds with afpr?

Leaner isnt necessarily less polluting. You need to find the sweet spot for low emissions in your case I think.... Id bet a dollar if you have an adjustable fpr and no gage its wrong for your otb tune

 

[Sy644]

Re: Emissions help, idle test

LOL crap emission! We in Iowa don't require emission, nothing. Buy and slap license plates right away. Also insurance req too.

 

[Audio Man]

Re: Emissions help, idle test

I beat my head in the wall reading these posts when mine didn't pass, all the searches I went through on the forums. Changed spark plugs with full tune up using all new AC Delco everything, de-carboned the motor, adjusted the fuel pressure, did all the stuff I kept reading about on forums and still never passed. The truck sat there for about a year while I kept reading and "fixing" stuff and not passing. It drove fine, just wouldn't pass so I couldn't get the tag sticker for it. After reading about all these "fixes" for this stuff I finally went up to the muffler shop and had them put a new cat on it. Drove over to the emissions place and passed perfectly. Have ever since. Nothing I did to the truck that I read about helped me pass emissions until I replaced the catalytic converter to a new one.
Had the same issue with my DD 94 Blazer and they told me it was this and that which I promptly swapped out for brand new parts...EGR, vacuum lines, all kinds of stuff. Spent all this money on all these parts and still kept failing the emissions test. Went to the muffler shop, $120.00 for a new cat, drive straight over to the emissions place and passed again and have for the last 3 years. No problem.

 

[Sy644]

Re: Emissions help, idle test

Agree I think syty common problem with the exhaust? My syclone exhaust leak some between cab and box. Cold time, can see vapor smoke out of exhaust. Obvious leak.

 

[0966Sy]

Emissions help, idle test

Running too rich or too lean to a cat convertor will shorten its life. If your convertor is less than a few years old and is bad I'd look into reasons for why it did not last. I recently passed emissions with my Ty with no cat, considering the tech did not look for it among other things the sniff tester wouldn't know the differance. A 14.7 afr will pass you, cat or no cat.

 

[The Dread Pirate Fisher]

Re: Emissions help, idle test

Any particular brand or CPI I should get? I was going to go with a stainless spun, 100 CPI high flow cat

 

[It's just a six]

Re: Emissions help, idle test

If you want to pass smog, you need a high CPI count, like 2000-3000 IIRC, not a 100. For smog checks, you could also use a smaller ID cat , this will cause a restriction, but it will also cause the cat to run hotter & burn more of the unburned fuel.

Before, I used to increase the idle to 1000 RPM via TB screw stop( # 10 torx IIRC?), unplug the brown wire w/stripe, you get a check engine light BTW, main thing that made the car pass every time is retarding the ignition timing, via unplug the brown wire w/stripe.

After I got to adjust the ECU with code 59 it was so easy to pass.

 

[Turbotoyz]

Re: Emissions help, idle test

Typical cat is 400 CPI, from what I read. I put on a 300CPI and felt no real adverse effects. Again, I hardly drive it so...Anyway, after the cat install the count dropped by 90 points. I needed 96, but what the hell, that's all I did.

 

[It's just a six]

Re: Emissions help, idle test

This high flow cat auction item states "This cat is 330 CPI-OE Cats are 500-900 CPI"

http://www.ebay.com/itm/UNIVERSAL-C...Parts_Accessories&hash=item3ef0097ebd&vxp=mtr

Not sure what a stock Sy/Ty cat CPI is?

After you get a non high flow cat installed, you do not want it to get stolen from you so this would be cool.

http://www.ebay.com/itm/CatClamp-St...Parts_Accessories&hash=item233711a91e&vxp=mtr

I like how the auction states. "•Heavy-duty, un-cuttable airplane wire rope " heck, any cut off wheel cuts right through aircraft cables.

 

[The Dread Pirate Fisher]

Re: Emissions help, idle test

The cat you posted is only 1.75", need 3", but i found a magnaflow that will work.

 

[Static]

Re: Emissions help, idle test

Im using a similar 3" spun cat. Ceramic guts. Trying to pass emissions this week. Its been 4 years since its been legal.