Big T
Well-Known Member
On my '99 with ATT, Heat Programming and this time with a gutted soot trap and 4" straight pipe welded through it in place of muffler.
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2 for 2 on CA Smog
- Thread starter Big T
- Start date
- Staff
- #2
Rock-n-roll, Big T! Passed the 'snap' test and everything?
Gotta like that!
Gotta like that!
JMJNet
Recruit
Great!!! I guess it proves that the soot trap does not do a thing.
- Staff
- #4
Also proves that an AT&T-equipped vehicle will easily pass an emissions test, even in California.
Contrary to what some people may have thought.
Contrary to what some people may have thought.
Big T
Well-Known Member
Yes he snapped it twice. Truck was in the bay at the station and I was in the office next door with doors open, coughing and gagging. I don't know exactly what they're looking for with the snap test, but it definitely puffs black smoke. I think all this proved is that Big T can swap the muffler out to a gutted soot trap designed to fit in it's place in less than 20 minutes. With practice every 2 years I should get that down to 10 
They are looking for continuous soot after the initial acceleration puff clears up. Too much puff smoke will coat the sensor and make the test hard to complete as the sensor can't zero.
I would not run around CA without a soot trap or mock up in place. I have seen roadside inspections for emissions there like DUI checkpoints. Maybe they don't do these anymore.
If you don't pass your fuel is too high or you have problems with the injection system etc.
Yes, the ATT can pass emissions even with a high flow 4" working soot trap in place.
I would not run around CA without a soot trap or mock up in place. I have seen roadside inspections for emissions there like DUI checkpoints. Maybe they don't do these anymore.
If you don't pass your fuel is too high or you have problems with the injection system etc.
Yes, the ATT can pass emissions even with a high flow 4" working soot trap in place.
Big T
Well-Known Member
I only have the initial puff, but it's ATT good.
CA has not done roadside inspections in years. No money for it and for the most part all the old gross polluters are off the road. This diesel smog check is a new thing, but the potential population of polluters is way too small to justify roadside testing, JMO.
Edzzed
Member
actually the soot trap does do a thing. It plugs up over many miles. Nice to know the att does pass. I have an upcoming smog test next November. I wasn't looking 4ward to it. although I don't have heath programming for an att. I have the hp tune.
Big T
Well-Known Member
WarWagon need not lose any sleep over my running around with a gutted soot trap in CA, I put the Diamond Eye muffler back on.:hihi:
1999gmc
Active Member
They just did roadside testing near Sacramento a couple of months ago.
Big T
Well-Known Member
Guess I was wrong:
http://www.smogtips.com/remote_sensing.cfm
Says they do it in 4 counties. It says it tests for Carbon Monoxide and hydrocarbon levels.
In the smog check they just did (and the prior one) they did not stick a sniffer in the exhaust. So I find it highly doubtful that the roadside test would be effective.
Worst comes to worst, I'd just pull the GM4 turbo and vac pump off my son's '95 and get it passed with that stuff on it, then restore it with the ATT.
1999gmc
Active Member
This wasn't like that. They closed a lane and set up a mobile smog machine with dyno right there on the side of the road. They had a highway patrol pull people into the closed lane and then test your car. About 7 years ago they pulled me over in my 69 nova. I told them it was smog exempt, but they still wanted to test it. They said they wanted to see what cars on the road were actually putting out. They usually are setting up on my way to work and are gone by the time I go home. They do it once every year or two. This last time they pulled my wife over and then told her her car wasn't on the list, and she could go.
pgguru
Recruit
In my Suburban the Cat is so far up stream that it runs way to cool to burn off the Carbon.
I had a picture of the one from my last suburban and it was a 90% solid carbon. I picked up 200km on 125L of fuel after I removed it.
I had a picture of the one from my last suburban and it was a 90% solid carbon. I picked up 200km on 125L of fuel after I removed it.
pgguru
Recruit
I found the Picture of the Soot Trap
Big T
Well-Known Member
My soot trap is guaranteed to never clog:
I can't imagine the resultant effects on the engine and fuel economy with a plugged soot trap. It's a case of penny wise and pound foolish.
I will admit that the one we took off the '95 was not plugged up like the one in the prior post. I had a choice of using the rusty gutted soot trap from the '99, or using the less rusty one from the '95 and gutting it. The easier solution was to use the '99 and I threw out the '95.
I can't imagine the resultant effects on the engine and fuel economy with a plugged soot trap. It's a case of penny wise and pound foolish.
I will admit that the one we took off the '95 was not plugged up like the one in the prior post. I had a choice of using the rusty gutted soot trap from the '99, or using the less rusty one from the '95 and gutting it. The easier solution was to use the '99 and I threw out the '95.
No need to go that kind of trouble. Stock tune should get it to pass with the ATT or get a low fuel tune for extra insurance. I can't say if they get midevil about vac hoses matching the diagram on Diesels, but, you could bolt a van can near the ATT and get by... I know they can on gas stuff.
Big T
Well-Known Member
But there's that sticker on the K47 showing the routing of the serpentine belt including the vac pump. I thought about taking a razor blade to the sticker and eliminating a portion of it. I doubt they can sniff the Heath tune out. Again, they did not even insert a sniffer into the exhaust. Purely visual plus the snap test.
Snap test is just an optical sensor on the exaust. No sniffer as it doesn't apply to the test. The shops have books with the vac hose routing and may frown on a modified sticker. Don't give them a reason to look closer... This is a contingency if you fail for vac hoses, although it would be good to know if they are supposed to look at them on diesels.
Rodd
Recruit
I took my 99 in for the first time this past May and passed. They didn't hook anything up to the exhaust if I remember correctly (He may have but I can't remember). He opened the hood and checked the sticker on the air box and went back to the book 3 or 4 times, He then pressed the accel to the floor and that was it. He didn't even hook up the obd2 to it. I asked him why and he said the air box sticker shows that my 99 truck is obd1 so he didn't have to connect to the trucks computer. I had no vac pump and a heath T/M. The guy said that since it says obd1 all he needs to do is check for the cat/soot trap and check for smoke.
Big T
Well-Known Member
Pretty much the same for me, back and forth to the book, but he did hook up the OBDII. I didn't watch to see if he checked the sticker.