That's right I can't get thru the MD emissions test! I have put in new injectors, new CAT. Everything on my car is 50 state legal. The only thing I can think of is that I have a bad EGR value or something. Not sure what's going on. The only potion of the test that I can pass is the cat converter part. Help me out here guys. Here's what I have.

88 Formula TPI 350 bored .30 over.
edelbrock headers jet hot coated.
big mouth manifold
flowmaster exhaust
24lb injectors
WC T-5
custom prom--hasn't been burned for new injectors

 

it would help if you told us which emissions you are failing for and by how much

 

I'm failing everything except the cat portion of the emission. And I'm within 10-20% of passing.

 

wow man sorry to hear that I dont know nothing about Emissions control cuz where I live all you need is like 20$ and the cars liscence and they pass you some place Highly illegal tho but hey if you find a place you dont even need to bring the car. lol Smog pump what smog pump!??:lala:

 

Could you tell us what you failed, and by how much?

Have you done a normal tune-up? Spark plugs, wires, ignition coil and cap, and fuel filter?

It's good maintenance, and it maybe that one of those components isn't functioning right, or optimally, and causing the problem.

 

Everything is new as I just had new injectors, new fuel pump, fuel filter, new bigmouth manifold, wires plugs etc. Practically a new engine.

 

What did you set your base timing to? If you advanced it, it could be part of the problem. You might want to try setting it to 6* or so, which is stock at least on an 86 305 tpi.

Nice engine it sounds like! Since you don't have a chip burnt for the new injectors, wouldn't that make you run too rich?

 

Thanks dude. I"m not sure whether or not a new chip would resolve this problem. I think the ECM automatically adjusts for the new fuel pressure....I just want it to run like a roadrunner.

 

I bet! : )

No, from what I recall, your ecm controls the injector pulse width, and if it assumes you have stock 22lb injectors, it will be running the new #24lb's at the same duty cycle.

With the O2 sensor, the ecm will adjust things to keep the air/fuel as right as it can.

You might want to jump in the ECM, or PROM board, and ask somebody there about emissions, and your current LB injectors with a stock ecm, and if that might be a factor in why you aren't able to pass.

Fuel pressure is controlled by a fuel pressure regulator, not the ecm. The ecm just tells the injectors when to fire, and for how long.

 

Thanks Chris I will do that...but keep the ideas coming as someone out there might have had the same problem....

 

What temperature is your car running at? If you have modded it to run cooler, that may be why you can't pass the test.

Remember, GM runs our cars real hot, like 220-230, just to pass emissions. Just thought I would throw that out there.

Also, I would be getting into that PROM real quick, if you changed the size of your injectors. Christos said it all correctly.

Or you could find a car that does pass emissons, and just plug in your car info so you can get the sticker. I don't think the sniffer pipe cares whose car its up!

 

MikeT 88IROC350 the car is running pretty cold these days with the jet hot coated headers and new radiator. The temps are around 170-180 so you could be on to something. I do have to get the chip burned sooner rather than later. Thanks for info....keep the ideas coming.

P.S. I wish the guys at the emission shop would have took care of me but they didn't make if I slip them a 20 or a 6 pack of beer they would do it.

 

I've heard that a lot from people, but none who back it up by saying they did it. It's always a friend of a friend sort of thing... Like hearing how a friend of a friend won a million dollars in vegas. Doesn't mean you will.

From a business perspective, they would be breaking federal law to do that, and the business would be shut down. I'm sure the owner has had lengthily talks with employees about just that, and also probably made them sign something stating they are solely at fault if they get caught breaking that law, to push as much blame away from the business as they can if it happens. I'm sure it does, but not as often as most people think.

Cool, get a chip burnt for those injectors, toss in a 190 degree thermostat (I think it's agreed that GM went a bit TOO hot on our cars, all newer cars that I see run 190*) and back your base timing to stock. Hopefully that will get you a passing grade!

 

You're right dude....I'd rather pass the old fashion way.....by truly earning the right.....now on to the chip burning.

 

You need to post the test results. I assume the NOx is too high? Do you have a manual fan switch? If so I'd turn the fans off during the test. Get that temp up to the 220 mark and you should be OK.

If my car passed with a larger engine than stock with the factory carb and NO cat then something is quite wrong.

 

I'll post the results in a bit. I don't have a manual fan switch and now my car runs around 160-170 degrees...

 

Okay here are the numbers

Hydrocarbons
Standard 1.7000GPM

My results were 27.3484GPM

Carbon Monoxide
Standard 30.0000GPM

My results were 137.4027GPM

NoX
Standard 2.7000GPM

My results were 2.7797GPM

So what do you think??

 

These are with your original prom right?

 

http://www.type2.com/library/exhaust/comix.htm

 

Yeah it a custom PROM I had burned years ago......I think I need..no I KNOW I need something else burned.

 

Here's what I learned from California's emissions test:


High HC levels are from an uneven air fuel ratio.

High CO levels are from a lack of Air entering the engine.

High NOX levels are due to High combustion temperatures.

Also, after emailing the California Air Resource Board, they told me that 50 state legal Aftermarket parts are tested, approved and certified to only work with the rest of the Stock engine components.

In other words 50 state legal aftermarket parts are not designed or approved to work in conjunction with other aftermarket parts 50 state legal or not. Hope this helps.

 

Those are some good tips there!

I passed Cali emissions somehow myself. I had my cat replaced, new plugs, wires, coolant temp sensor, timing set to stock (6* advance) and also had my fuel injectors cleaned.

I will look for my sheet, but I had 0 c02, I remember that. I was running a bit lean too oddly.

 

heres a link that may be of interest for those requiring e-test

https://www.thirdgen.org/techbb2/sho...hreadid=194191

 

Thanks guys I'll keep you posted. I did receive a waiver because I had sooooo much work done to the car....I'll have to get tested again next year if I'm not in the desert by then.....