Re: Need help getting 1991 back in operation
 

Thanks, it looked a bit scary. Will get to it tomorrow and plan to empty a tank of gas to clean everything out before the next smog.

Cheers,
Don

Re: Need help getting 1991 back in operation
 

What part of California are you in? I’ve had to really work to get my bone stock 25,000 mile 91 to pass,it’s failed twice.

Re: Need help getting 1991 back in operation
 

San Jose. Plan to go to the smog shop in Mountain View. I think they test the Corvettes for Northstar Corvettes. Any suggestions on what to do to get it to pass would be appreciated. I have 85k miles on mine but it is stock too.

Re: Need help getting 1991 back in operation
 

I’m in Fremont,you need to start the registration process,get a temporary moving permit and put some miles on the car. I’ve got to get mine smogged in a few weeks. Send me a P.M. for some tips and I’ll give you my number.

Re: Need help getting 1991 back in operation
 

Getting the connector to seal is a real bastard. I used a long screwdriver,a wad of dumdum on the end of it,stuck to connector on the end of just to get the connector to line up with the other end. Once it’s lined up I used something long to oust it all the way on until it’s locked in place. Dumdum is that black seam sealer stuff used in the automotive trade.

Re: Need help getting 1991 back in operation
 

Precision Motive in Hayward has experience with ZR-1s,if you have to take it somewhere that’s an option.

Re: Need help getting 1991 back in operation
 

Take out the K frame to get to the right O2 . It is a brace only. It supplements the motor mount rigidity. It does not hold up the motor. Pulling it out does not affect motor position.
I bought another connector and made an extension for mine. Next time will be easy peasy.

Re: Need help getting 1991 back in operation
 

Whatever happened with this?

Re: Need help getting 1991 back in operation
 

Just got it smog tested yesterday - passed with flying colors. Here's what I did based upon input from Marc H.

1. Replaced O2 sensors - even though no codes.
2. Changed oil and filter. Might have helped hydrocarbons a bit.
3. Put CRC Emissions Systems Cleaner in 3/4 full tank and drove it in 4th gear for about 100 miles (about 3500 rpm) with some WOT exercises. Then normal driving for another 100 miles to finish off the tank of fuel. Filled her up and drove to the smog station. Passed with no problems. Note - this was a different smog test location from the previous one and he used lower gears for both the 15 and 25 mph tests. Interesting!! Hydrocarbons are now better than average and NO gases only slightly higher than average. Both well under max allowed.

Thanks to all on the forum for your help and a BIG thanks to Marc H for his advice.

On to fixing everything else now :) Tires, brakes, suspension.....

Re: Need help getting 1991 back in operation
 

After modifying my 84 Xfire, I spent a year trying to get it passed. The “clown” doing the driving kept lugging the motor in 4th at 20mph, so my HC numbers spiked on decel.