mantiz85ws6

Just failed MA. inspection any advice on things to lower HC'S and CO'S ??
hc limit 02.00 I failed at 03.98
co limit 030.00 I failed at 048.17
NOx limit 03.00 I passed at 00.30

I have 60 days to fix and pass the re-test.

Things that are new on the car before test

1. new plugs, wires, cap, rotor, 02 sensor all sensors checked for proper operation.
2. AFPR is set at 47 psi
3. timing advanced 10 degrees
4. checked for vacuum leaks none noted

There is only 9000 miles on the motor I took the car out for a good 30 minute drive before the test.

John 89 Formula

timing on a stock tpi should be 6 degrees, reset it for the test.
also, what condition is the exhaust in, and is the air pump and diverter valve working properly.

where are you in Mass?

89IrocZ350TPI

Just find a place that will pass anyone. I have

mantiz85ws6

The exhaust is new with no leaks. Not sure if the diverter valve and air pump are working properly all the emissions equip. is hooked up. How do you test the valve and air pump??

John 89 Formula I am in Haverhill. I use to work in Everett on Broadway.

89IrocZ350TPI: Do you live in MA. and could you PM

90tararebird

iTrader: (4)

mine failed in mass two months ago. I had to fool with the timing to get it to pass. Took a couple of tries.

mantiz85ws6

90tararebird:
Were you able to test it before you went for the re-test?? You said it took a couple of tries but they only allow you one re-test?

89IrocZ350TPI

I live in MA outside of Worcester.

mantiz85ws6

89IrocZ350TPI

Can you PM me with info on where you got your car to pass??

90tararebird

iTrader: (4)

I went back second time and it was free and the next time i had to pay. To The best of my knowledge the test will be the same where ever you go in Mass. the only way they can trick the test is by using another car an saying it was yours. No shop will do this unless you know somebody there and are real tight with them. It used to be real easy in Mass. they got tough about six years ago.

mantiz85ws6

What did you do with the timing to get it to pass?

subliminal

iTrader: (1)

Tell them the transmission has problems and they will do an "Idle test" They will sniff the car with it just idling the car wont be revving as high so it wont be putting out nearly as much emissions. It works

mantiz85ws6

Once your in the system for the roller dyno they can't change the test the registry tells them what test to do.

Things I have thought of to try and lower the emissions

1. retard timing back to 6* or so

2. lower fuel pressure from 47 to 40 psi

3. possibly put in a higher rated thermostat 195-200 degree

4. Try running that emissions pass add to your gas solution they sell at the auto parts store.

5. I do have a scan tool but i'm not quite sure what readings I should be looking for. Maybe someone could point me in the right direction.

6. Also I found that my knock sensor wire connector was not connected to the sensor it came off. Not sure if that would have made a differance.

89IrocZ350TPI

I guess it comes down to who you know. My buddy works down there so thats why my car passed. I dont think they just pass anyone.

90tararebird

iTrader: (4)

one other thing i did was put in two bottles of stp gas treatment. Not sure if it did anything but it was recomendedby the guy at the inspection station. Can't hurt.

mantiz85ws6

anyone ever use that emissions cocktail that they guarantee you pass emissions. I think they sell it at autozone or cap??

GOY

I would check the cat for proper function, lower the FP is possible, and ensure proper AIR system function, including a tube to the cat if so equiped. - your numbers indicate inadequate combustion/excessive fuel. Make sure the plug wries are in correct sequence.

If you get desperate, try 2 oz'es of acetone per 10 gallon's of fuel for the test. It will cause greater atomization, and with that, the likelyhood of lower emissions due to more complete/equal combustion. I've run acetone for about a year now I think - with great results and no ill side effects. I will not advise you to do that more than once however due to some feelings of acetone's corrosiveness. I do not share them, but some feel passionate about it.

mantiz85ws6

The cat is basically new and it does have the air tubes hooked up in fact the whole emissions system is intact. The thing that really confuses me is the motor only has 9000 miles on it. Maybe the prom that was burned for it is causing this. I will double check the firing order. I'll have to look more into the acetone that you are suggesting.

Thanks

DENN_SHAH

iTrader: (1)

from the readings you posted your running rich.
along with what has been mentioned, how old is your O2 sensor? is it a Delco sensor?

problems with the AIR injection will also cause you to run rich.
the AIR injection should not be injecting air into the exhaust manifolds once the motor has warmed up, if it is then there is a
problem with it somewhere.

**EDIT**
there could be something with the PROM causing your problem, do you still have the stock PROM?

GOY

I'd start there....

mantiz85ws6

The 02 senssor is new but it is not a delco unit I think it might be a bosh. How do you determine if the air injection is not working properly is there a test I can perform for this?? The prom was a custom ordered prom made for the new motor.

mantiz85ws6

Also the chip was burned by Formatos in Florida it was done before I bought the car anyone ever hear of them??

firebirdjosh

iTrader: (1)

I don't know where you get it inspected, but if I went in and said that they'd fail me for saftey and get a big R on my windshield.


Retard timing, knocking down the fuel pressure, and a 195 thermostat should do it. If not then datalog your car and see what's happening since the emissions equipment is all there from what you say. Any knock?

MARKT111

I have passed before with even with no cats!!! definately lower that fuel pressure to 40-42, knock timing down to stock 6*, are you running a stock chip? if not put it back in for test, definately want that motor hot, run it hard prior to test

mantiz85ws6

Problem with the chip is I don't have a stock chip the car was formerly a 305 TPI automatic and was converted to a 350 5 speed TPI and the chip was sent out by the previous owner for all the mods that were done to it. I am not getting any knock but again I found the knock sensor wire plug off the sensor after the test. I do have a few chips that came with the car one is a TPICHIPS and it has a sticker on it that says corvette manual not sure if I put that one in it will bring it closer to stock form.

DENN_SHAH

iTrader: (1)

the best way to check the AIR injection is to do the following & use a scanner or scanner program.
if you don't have access to a scanner, you can still check it but you won't know where the ECM is commanding the air to go to.
pull one of the air injection hoses that goes to one of the manifolds, start with the motor cold & let it warm up to operating temp, check for air coming from the hose with the motor running & still cold just after you have first started the motor, normally there should be air going to the manifolds when cold, check it again after the motor has fully warmed up, there should not be air coming from it. if there is then you will need to do some diagnostic work to figure out where the problem is.

if the AIR system checks out you may want to try & find a stock chip from a wrecking yard & give it a try.

once you think you have it repaired you may want to ask if you can get something like this done, im not sure if they have it where your at or not, but here we can do a "training mode" test, its the same test as the real thing but nothing is sent in to the state & we don't charge full price for it.

mantiz85ws6

DENN_SHAH

I will test the air injection tomorrow thanks for the info. I do have a scanner what am I looking for when I connect the scanner?? I'm not sure if they give a " TRAINING MODE TEST" here in MA. probably not cause they like to bone you in this state. Anyone from Ma. know about a pre-test you can have done before the actual test? Please let me know.

DENN_SHAH

iTrader: (1)

there should be something that shows where the ECM is commanding the air to go to, it could be listed as, AIR Upstream, AIR Downstream, or it may be listed only as diverted, it varies with different scanners.
what brand of scanner do you have?

mantiz85ws6

Auto xray

slygy0

real quick, put in a cut out, as long as they dont look under the car, they didnt with mine in Rhode Island, open it up and only like 1/4 the gas gets out the back. should pass no problem. also if you can convince him to test it with only one tailpipe you will be golden, there is an option in the computer for them to put one or two pipes in and if they choose one its 1/2 the gas again.
just my 2 cents

mantiz85ws6

Cut out?? Please elaborate
Thanks

slygy0

you know the pieces that dump the exhaust before the muffler. bracket racers usually use them. closed you have a full exhaust, open you have a straight through. put it after the cat so it doesnt smell so bad.
look here

http://store.summitracing.com/defaul...=egnsearch.asp

mantiz85ws6

As you all know I have been trying to get to the root of my emissions problem. Well I also contacted Summit racing Tech advice on my problem and gave them the full specs on what I am running. There conclusion was that my cam was not the proper cam for my set up this is what they e-mailed me

1. the cam is not computer compatable
2. the lobe seperation is too tight
3. the cam is a flat tappet and not a hydraulic roller does this matter?

specs on cam Iskenderian 264 Mega p/n # 201264

264/264
214 degrees @.050
LSA 108
I/C 104
intake lift .450
exhaust .450
Intensity 50 degrees

Also today I checked my fuel pressure it was at 52 psi I adjusted it down to 42 psi. with my scanner hooked up I could not get my BLM above 108 even with the fuel pressure change.
I also checked to see if the air injection was working it seemed to be I removed the hose from the air tube and could feel air coming out. Maybe the cam is the reason for the emissons failure. I/m not sure if the chip was ever tuned for this cam so maybe that could be done.

2new2funny

Update?

Clearly, the cam is a factor.
I had trouble passing with a zz4 cam!

mantiz85ws6

I am taking it for a re-test this week and hopefully it will pass. I set the base timing back to 6* stock setting, turned down the fuel pressure, replaced 160* thermo to 190* thermo and replacing the current high flo cat with a new 3 way cat. I could definately feel the loss in power with the timing set back to stock. I also don't think it was getting hot enough with the 160 thermo I was never able to get it to run warmer than 170 but now it gets up to 192 deg that should help out.

2new2funny

Do keep us posted.

This is what gave me trouble on my car:

ZZ4: Duration @.050 208/221 Lift: .474/.510

rgarcia63

Was the ECM ever programmed to controll the fan for either thermostat range?

mantiz85ws6

I'm not sure what the current chip configuration is set for what temp to turn the fan on. I think it turns on around 170 right now.

BOTTLEDZ28

iTrader: (9)

grab a bottle of the Emissions in a can stuff from autozone and then if your running a bit rich, leave a small 7/32" vaccum line open under the hood. this iwll allow a bit more air to enter the engine on deceleration after the throttle blades are closed. A hot running engine helps a little bit too. 220 maybe.

Red Devil

Ma is a PITA and they can't get that test right still. Mess with it and add some additives, most of the time it will get it by.

mantiz85ws6

Still haven't got a chance to get the re-test, because I changed the spark plug wires 3 days ago due to a couple burned ones from the headers wouldn't you know the dam thing wouldn't start up? It turns over fine and dandy but will not start i'm just burned out from this crap!! I checked the battery voltage it was low under 12v's so maybe the battery is not giving it enough juice. I haven't checked the fuel pressure yet, but I can hear the pump priming and now the friggin fan turns on when I turn the iginition key to the on position!!?? Well anyway back to the emissions I ran a bottle of dry gas in the tank and as soon as I can figure out the no start issue I will put some emissions cocktail in it as well. Mass sucks!!