carney714

I took my 78 corvette in for a smog check in order to get it registered and it failed. i was give this report (picture) but not sure what to do. thanks

Smadoo

It looks like you're missing some parts of the emission control systems. Has the emission system been removed from the engine compartment?

Shark Racer

With the test saying you're missing EGR, and the NOx being so low, I have little doubt that the car is running very rich. It sounds like you need to reconnect quite a number of emissions devices (EGR, AIR, and some others), tune the carburetor and quite possibly rejuvenate your ignition system.

carney714

It hasn't been removed. Wouldn't know where to look for those devices

centralcalvette

Looks like you're missing an egr valve, some or all your smog pump parts are missing, your fuel tank system isn't holding pressure/vacuum and your thermostatic air cleaner vacuum lines are either disconnected or installed wrong. You're either gonna have to spend a bunch of money for repairs, ask for a hand out on the forum, or if you're in Cal, go for some state assistance (fill out the form, uop to $500.00 is available,based on income.)Assuming you're in Ca, get a non-op and start tackling it...

0Paul Ruggeri

Where in Cali do you live. I own a 78 that has all the original smog equipment. I'm near Sacramento if you want to stop by and see what yours is suppose to look like.

Shark Racer

I'd be willing to take a look at your car as well, and am willing to represent the south bay area. (Near Sunnyvale/San Jose)

72LS1Vette

Are you the original owner? If not, and if you don't know what the devices look like, how would you know if they were removed or not?



Rick B.

carney714

Not the original owner, Found where the egr suppose to go. Its missing along with something else next to it i beleive.
Previous owner decided to invent his own way on fixing it by the looks of it.

I live in Santa Ana California

72LS1Vette

You should buy a copy of the AIM (Assembly Instruction Manual) for your year. Willcox sells a nice one on CD that is searchable. That will tell you what you are missing in the engine compartment and what hoses may have been disconnected. Make sure your catalytic converter is in place in the exhaust system also.



Rick B.

carney714

carney714

Might you happen to have a link to AIM?

72LS1Vette

http://willcoxcorvette.com/product_i...ducts_id=25540

Willcox is having a Spring sale so you might be able to save a few $. Check ebay also. They sometimes sell things there for better prices than you can find on the website.



Rick B.

tracdogg2

Need alot more pics of the engine compartment to see what else is missing.

carney714

I can take them, which sides/angles would be necessary?
Im thinking about purchasing that willcox AIM, need to work on the ac as well.

GT's 78

Get an antique tag, no emmission test required in my state, dont know about Cali

7T1vette

The 'AIM' is an assembly manual...not a problem solving tool. But, it will show you what equipment was installed on your car and where it should be located. For trouble shooting/diagnostics/design issues, the Chevrolet Chassis Service Manual is the appropriate 'tool'.

Smadoo

The AIM shows how the car was assembled at the factory. The Service Manual/Shop Manual is what the mechanics used to solve issues.

kdf1986

When did you get your Corvette? If your not the previous owner then in California the person selling the car has the responsibility to get the car smog checked prior to the sale in order to remove this type of problem being passed to the new owner. Not exactly word for word in the DMV but that is the intent of the law.

kdf

tracdogg2

Take the air cleaner off, take pics of the carb, the front and both sides of the engine. Not as close as your first pic. I need to see the front top of the intake and the exhaust manifolds to see what you are missing. You should have 3 or 4 vac hoses coming up from behind the lf wheel well. These are the vapor cannister hoses which is one test you failed.
Also looking for 2 thermostatic vacuum switches on the intake.
The AIM won't help for repairs on the ac, just what parts you should have.
Mike