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#4540346 - 10/11/17 03:21 PM TRYING TO PASS SMOG
VSTAR650 Offline


Registered: 01/10/13
Posts: 22
Loc: SOUTHERN CALIFORNIA
Hi gang, has anybody here heard of and or has experience with a product called CRC-Guaranteed-to-Pass-Emissions Test?
Reason I ask is I have inherited a 1985 GMC Sierra Classic 1500 that had failed smog test, It is completely stock and original, has a 305 backed by an automatic(I'm guessing it is a TH350). It is a California truck with a cat converter. The cat and Flowmaster muffler are supposed to be fairly new.
Thank you in advance for any responses,
THUMPER>>>>>>>>>>>>>>>>>>>>.

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#4540357 - 10/11/17 03:30 PM Re: TRYING TO PASS SMOG [Re: VSTAR650]
Char Baby Offline


Registered: 05/25/05
Posts: 10013
Loc: ROCHESTER, NY
Well, CRC's only guarantee is your money back if it doesn't work. However I believe that the Guarantee to Pass is only an injector/intake valve/combustion chamber cleaner. Your issues may infact be the FlowMaster Cat as these are not always California certified...or meet California emissions.


Edited by Char Baby (10/11/17 03:32 PM)
_________________________
"Retired"
'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'06 Mazda 3i 2.0L
'15 Nissan Altima 2.5 SV

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#4540365 - 10/11/17 03:37 PM Re: TRYING TO PASS SMOG [Re: VSTAR650]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
We have similar emissions standards in Ontario as CARB and the CRC stuff is peddled here and never works. If you can provide me the numbers from your test to indicate what is the problem Eg: High NOX or High Hydro Carbons I can better advise you what to try to get it to pass.

Eg: Retarding the timing etc.

Also is this Throttly Body injection or Carb?
_________________________
'15 Dodge Journey - 90,000 KM's - SSO 5w20
'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

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#4540376 - 10/11/17 03:47 PM Re: TRYING TO PASS SMOG [Re: VSTAR650]
SirTanon Offline


Registered: 06/23/14
Posts: 2137
Loc: Phoenix, Arizona - USA
Something else to consider - When you bring this vehicle in for testing, are you going for a decent drive first in order to get your Cat properly heated up? I had to do this with my last car - Drive it around for about 15-20 minutes, and as I sat in line, keep the engine at about 1500-2000 RPM to keep the Cat hot. Worked fine.

Beyond that, I'd say that if it still doesn't do the trick, then rather than spending your money on the CRC product, put it into proper diagnosis and repair. Might even be something as simple as new plugs.
_________________________
2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 256,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 54,500mi

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#4540377 - 10/11/17 03:47 PM Re: TRYING TO PASS SMOG [Re: Char Baby]
VSTAR650 Offline


Registered: 01/10/13
Posts: 22
Loc: SOUTHERN CALIFORNIA
Hi Char, thanks for the quick reply.

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#4540382 - 10/11/17 03:52 PM Re: TRYING TO PASS SMOG [Re: StevieC]
VSTAR650 Offline


Registered: 01/10/13
Posts: 22
Loc: SOUTHERN CALIFORNIA
Hi Stevie, thanks for the quick reply, I don't know why the truck failed on the previous test and my nephew did not hang onto the paperwork from the test center, this truck has a 4bbl carb and HEI ignition( I had to replace the module, also the p/u is new).

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#4540384 - 10/11/17 03:56 PM Re: TRYING TO PASS SMOG [Re: VSTAR650]
SatinSilver Offline


Registered: 01/24/08
Posts: 10128
Loc: OH
At $8 a bottle I might be tempted to try this stuff right before an oil change to keep things nice and clean. Maybe a one two punch btwn this and a bottle of Techron back to back.

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#4540385 - 10/11/17 03:57 PM Re: TRYING TO PASS SMOG [Re: SirTanon]
VSTAR650 Offline


Registered: 01/10/13
Posts: 22
Loc: SOUTHERN CALIFORNIA
Thank you SirTanon, when I take it for the test I will follow your advice, I also put new plugs in it when I changed the distributor parts (cap, rotor, module and pickup). The plug wires were replaced by my nephew and were still like new.

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#4540389 - 10/11/17 03:59 PM Re: TRYING TO PASS SMOG [Re: SatinSilver]
VSTAR650 Offline


Registered: 01/10/13
Posts: 22
Loc: SOUTHERN CALIFORNIA
Hi Satin, I just might give it a try, the reason I posted the question is because it was recommended by one of my nephews friends and I have never heard of it before.

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#4540391 - 10/11/17 04:01 PM Re: TRYING TO PASS SMOG [Re: VSTAR650]
Kool1 Offline


Registered: 01/25/13
Posts: 906
Loc: California
You may want to find a smog station that advertises "pay if you pass". This way, when you most likely fail, you will know the reason without shelling out more money.

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#4540393 - 10/11/17 04:02 PM Re: TRYING TO PASS SMOG [Re: VSTAR650]
Chris142 Online   content


Registered: 06/05/03
Posts: 16808
Loc: Deplorable in apple valley, ca
Good luck. California has been tightning the max alowable emissions in an attempt to get older cars off the road. That truck was originally built to pass with say 400ppm of hc. Now they want it to pass 100ppm. Something it was never designed to do.


Edited by Chris142 (10/11/17 04:02 PM)
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#4540410 - 10/11/17 04:40 PM Re: TRYING TO PASS SMOG [Re: VSTAR650]
mk378 Offline


Registered: 09/27/15
Posts: 1414
Loc: USA
When you change distributor you have to set the timing.

Right now you don't even know if it failed the visual check or the tailpipe meter, and if the latter which of the pollutants. If some part is not CARB compliant, pouring stuff into the gas tank isn't going to fix that.

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#4540423 - 10/11/17 05:00 PM Re: TRYING TO PASS SMOG [Re: SirTanon]
JohnnyJohnson Offline


Registered: 10/22/09
Posts: 2730
Loc: Wet side WA
Originally Posted By: SirTanon
Something else to consider - When you bring this vehicle in for testing, are you going for a decent drive first in order to get your Cat properly heated up? I had to do this with my last car - Drive it around for about 15-20 minutes, and as I sat in line, keep the engine at about 1500-2000 RPM to keep the Cat hot. Worked fine.

Beyond that, I'd say that if it still doesn't do the trick, then rather than spending your money on the CRC product, put it into proper diagnosis and repair. Might even be something as simple as new plugs.


Yep my Duramax won't pass if its cold. Take it out for a 30 minute cruise on the freeway and it passed with flying colors.
_________________________
2004 Toyota Corolla 121478
Out: QSUD 5W-30 Purolator One 5030
In: Valvoline ML 5w-30 TG4967 117530 2-8-18
2006 Duramax 74016
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73752 4-22-18

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#4540433 - 10/11/17 05:14 PM Re: TRYING TO PASS SMOG [Re: VSTAR650]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Carburetor or fuel injection ? That's about the year when they were switching over.

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#4540450 - 10/11/17 05:39 PM Re: TRYING TO PASS SMOG [Re: VSTAR650]
BrocLuno Offline


Registered: 09/06/15
Posts: 5502
Loc: Kalifornia Kollective
Do Cali stuff all the time, not that I like it ... But, the air is cleaner (except for smoke right now ...). The SMOG checks helped a lot with that. You can usually see across the So Cal basins on most days smile

So this is GM's last carburetor year for that truck. W/o the paperwork, we don't know what the "fail" was ... Most likely, if it made it past the visual, could have a leaky gas cap (fumes/won't hold pressure), or that the engine needs a serious tune-up.

All the carburetor functions must be there. Choke stove is a biggie. If the choke is not operating absolutely correctly, it won't pass.

You swapped a module in the HEI. OK, there are bunch of things to check in the HEI as we now have to have "rolling road" tests. That means the advance curve needs to be good. No hick-ups in how the advance comes in, no flat spots in the fuel mixture, etc.

PM me with a real email address, and I'll send you what I have on HEI rebuilds and timing info ... smile

The next thing to look at is cold start. After sitting over night, does it smoke? That would be valve seals. Does it smoke on decel or going down a grade? That would be rings or leaky intake manifold.

Have you changed the PCV valve and ALL the vacuum hoses? Any vacuum leak will throw things off ...

New clean oil and a filter (hopefully HDEO 15W-40 Delo 400 LE). Best oil I have found to get old SBC's pass SMOG ... smile

Tranny could be either, but many trucks got TH400, even with 305 smile


Edited by BrocLuno (10/11/17 05:42 PM)
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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