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TRYING TO PASS SMOG #4540346
10/11/17 02:21 PM
10/11/17 02:21 PM
Joined: Jan 2013
Posts: 22
SOUTHERN CALIFORNIA
VSTAR650 Offline OP
VSTAR650  Offline OP
Joined: Jan 2013
Posts: 22
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>>>>>>>>>>>>>>>>>>>>.

Re: TRYING TO PASS SMOG [Re: VSTAR650] #4540357
10/11/17 02:30 PM
10/11/17 02:30 PM
Joined: May 2005
Posts: 10,551
ROCHESTER, NY
Char Baby Offline
Char Baby  Offline
Joined: May 2005
Posts: 10,551
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.

Last edited by Char Baby; 10/11/17 02:32 PM.

"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: TRYING TO PASS SMOG [Re: VSTAR650] #4540365
10/11/17 02:37 PM
10/11/17 02:37 PM
Joined: Aug 2008
Posts: 21,245
ON, Canada eh?
StevieC Offline
StevieC  Offline
Joined: Aug 2008
Posts: 21,245
ON, Canada eh?
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?


'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: TRYING TO PASS SMOG [Re: VSTAR650] #4540376
10/11/17 02:47 PM
10/11/17 02:47 PM
Joined: Jun 2014
Posts: 2,730
Phoenix, Arizona - USA
SirTanon Online content
SirTanon  Online Content
Joined: Jun 2014
Posts: 2,730
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 - 266,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 60,000mi
Re: TRYING TO PASS SMOG [Re: Char Baby] #4540377
10/11/17 02:47 PM
10/11/17 02:47 PM
Joined: Jan 2013
Posts: 22
SOUTHERN CALIFORNIA
VSTAR650 Offline OP
VSTAR650  Offline OP
Joined: Jan 2013
Posts: 22
SOUTHERN CALIFORNIA
Hi Char, thanks for the quick reply.

Re: TRYING TO PASS SMOG [Re: StevieC] #4540382
10/11/17 02:52 PM
10/11/17 02:52 PM
Joined: Jan 2013
Posts: 22
SOUTHERN CALIFORNIA
VSTAR650 Offline OP
VSTAR650  Offline OP
Joined: Jan 2013
Posts: 22
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).

Re: TRYING TO PASS SMOG [Re: VSTAR650] #4540384
10/11/17 02:56 PM
10/11/17 02:56 PM
Joined: Jan 2008
Posts: 10,958
OH
SatinSilver Offline
SatinSilver  Offline
Joined: Jan 2008
Posts: 10,958
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.

Re: TRYING TO PASS SMOG [Re: SirTanon] #4540385
10/11/17 02:57 PM
10/11/17 02:57 PM
Joined: Jan 2013
Posts: 22
SOUTHERN CALIFORNIA
VSTAR650 Offline OP
VSTAR650  Offline OP
Joined: Jan 2013
Posts: 22
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.

Re: TRYING TO PASS SMOG [Re: SatinSilver] #4540389
10/11/17 02:59 PM
10/11/17 02:59 PM
Joined: Jan 2013
Posts: 22
SOUTHERN CALIFORNIA
VSTAR650 Offline OP
VSTAR650  Offline OP
Joined: Jan 2013
Posts: 22
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.

Re: TRYING TO PASS SMOG [Re: VSTAR650] #4540391
10/11/17 03:01 PM
10/11/17 03:01 PM
Joined: Jan 2013
Posts: 911
California
Kool1 Offline
Kool1  Offline
Joined: Jan 2013
Posts: 911
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.

Re: TRYING TO PASS SMOG [Re: VSTAR650] #4540393
10/11/17 03:02 PM
10/11/17 03:02 PM
Joined: Jun 2003
Posts: 17,814
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,814
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.

Last edited by Chris142; 10/11/17 03:02 PM.

02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: TRYING TO PASS SMOG [Re: VSTAR650] #4540410
10/11/17 03:40 PM
10/11/17 03:40 PM
Joined: Sep 2015
Posts: 1,592
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,592
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.

Re: TRYING TO PASS SMOG [Re: SirTanon] #4540423
10/11/17 04:00 PM
10/11/17 04:00 PM
Joined: Oct 2009
Posts: 3,512
Wet side WA
JohnnyJohnson Offline
JohnnyJohnson  Offline
Joined: Oct 2009
Posts: 3,512
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 Corolla 126649
Out: VML 5w-30 TG4967 OCI 5007 Miles
In: EDGE EP 5W-30 Bosch 3311 122537 7-18-18
2006 Duramax 74478
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73705 4-22-18
Re: TRYING TO PASS SMOG [Re: VSTAR650] #4540433
10/11/17 04:14 PM
10/11/17 04:14 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Carburetor or fuel injection ? That's about the year when they were switching over.

Re: TRYING TO PASS SMOG [Re: VSTAR650] #4540450
10/11/17 04:39 PM
10/11/17 04:39 PM
Joined: Sep 2015
Posts: 6,075
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,075
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

Last edited by BrocLuno; 10/11/17 04:42 PM.

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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