Posted this over in General but forgot with all the questions on lugnuts and bling rear lights it would scroll out before someone with any tech knowlege could see it Hoping maybe you guys can help out.

I am taking my '02 C5Z over to get it smogged next week and had a question. I have a Halltech CAI on it right now, they are VERY strict about visual inspections here and this unit has no CARB EO# so I was already told it was a fail if I try to smog it with it. No problem, I picked up a stock ZO6 setup from a forum vendor and will swap over to that for the test.

Here is the issue. On the airbridge there is a hole for what looks like an IAT sensor. The thing is I can't find one anywhere in my engine compartment and my factory manuals for my car say that the '02 has the MAF and IAT all in the one unit, no separate sensor. Also there is a very tiny hole back towards the throttle body. No mention of what this is and in the only picture I can find of it it is uncovered. I always thought an air leak between the MAF and the throttle body was a sure cause for trouble.

So is there something different about the '02? Was this sensor eliminated and I should just plug it? It needs to look very stock to pass the visual. Here are some pictures for reference.

What I have now (already disconnected the one hose into the air cleaner):


This is the stock airbridge I bought to swap in, was supposed to be ZO6:


This is a picture of a LS1 stock airbridge I got from a book, has the sensor, doesn't have the little hole covered up:


Any information would be greatly appreciated. Thanks a lot guys.

 

Your '02 Z06 has the IAT as an integrated part of the MAF sensor. If you notice, your MAF has 5 wires, which is an indicator that it does IAT as well. Quite honestly, there is no reason in the world that a cold air kit on your car would cause it to fail emissions, even from a visual inspection. However, CA may be ultra strict about that stuff.

 

Yeah, just going by what the smog guy said. No CARB EO#, no pass visual, it's kind of sad. I could play smog tech roulette and keep trying different places but I just want it over with, and I already bought the airbox.

So the airbridge they sold me is from an LS1 and the '02 LS6's have that spot blocked off? Any ideas about the small hole up toward the throttle body? If anyone who has an '02 C5Z with a stock airbridge could look at their's real quick and let me know if I should leave the small one uncovered that would be great. Thanks a bunch for the information.

 

I just looked at the stock airbridge from my '01 Zo6 and both of those holes are blocked. I can see a boss area where those holes would exist on previous cars (pre '01) but they are solid.

You should get your money back from whoever ripped you off, they didn't sell you an airbridge from a car newer than 2000.

 

I have the stock airbridge from my '02 and the boss is there but blocked so the one you have is probably incorrect. Mine is off my car as I have an aftermarket airbridge as well. If its worth it you to try and hook up (I live in Pleasanton and work in Fremont) you can borrow mine to pass smog and then get it back to me as I will need to pass smog in the next couple of weeks myself.

PM me if you want to try and work something out.

 

solution to your problem is move from **** california and leave it to the illegals

 

That is not a Z06 airbridge.

 

Yeah, I have to be honest I wasn't thrilled with how things went down. I basically wanted to put together a stock replacement set of the things that had been modded on my car and I didn't have just in case I ever needed them. We agreed on a price for stock ZO6 H-pipe with cats, stock exhaust manifolds and a stock airbox setup. I was very specific about it being '02 ZO6 parts and they agreed.

I didn't want to press them as I had two years to get all the stuff at the time so kept badgering them here and there and stressing that it must be ZO6 stuff like we agreed. So long story short it took 8 months to get all the stuff. The first airbox was off an LS1, that was easy to see because of the front opening, so they sent out a LS6 airbox. This stuff is all take offs for them and they have stacks lying around. Then I looked and as far as I can tell the LS6 and LS1 use the same exhaust manifolds that year, at least as far as I could tell from traceing the casting numbers.

Then the H-pipe was for an LS1, they said it was all the same. But they aren't, the LS1 have the little pre cats on them and the substrate itself doesn't flow nearly as well as the LS6 part. I figure it's only for the test and only if the smog guys notice. They haven't said anything about the exhaust yet.

I just figure at this point while I didn't get the ZO6 parts we had agreed upon, it took 8 months to get all the stuff and that was completed nearly a year ago so I am pretty much stuck with what I have. I will just try to cut a section out of the LS1 airbox they sent me and Gorilla glue it over the hole. If I do it clean enough that should match well enough to let me get past visual smog.

To be honest what I had really wanted was all the original OEM ZO6 stuff while it was still common and very cheap. I wasn't ever intending on using it other than smog and for that the LS1 stuff will work as well so while I am disappointed, it is kind of not worth pursuing. I seriously doubt the salesman I talked to even remembers me or the order after nearly a year so I doubt I could get him to cough up an actual ZO6 airbridge like they were supposed to at this point. And after the number of phone calls it took to get the stuff I got I don't think it would be worth it. They are a high end Corvette race parts company and my nickel dime stuff really doesn't command much attention when they are selling multi thousand dollar components all day long.

I will just plug the one hole and I guess leave the little one by the throttle body open and hope they continue to not notice the headers so I can just get this over with for another two years. Thanks for all the information and input guys, I really appreciate it. God forbid they see the headers and I have to find the bolts and gaskets and stuff to put in the stock ones.

 

Call Halltech and see if they have a CARB number for the unit.

 

That's a 97/98 air bridge and the small hole is for fuel pressure regulator hose. MAF sensor for 97-00 is smaller diameter also, doubt yours will fit.

 

Yeah, I tried plugging the holes so they looked stock now that the smog guy is looking at that item. Kept being blatantly noticeable, no way it was going to pass visual. So for a hail mary I just called the guys I got it from originally LG Motorsports, talked to Bobby, he finished the order originally and Anthony started it.

Not only did I not have to fight with them, I didn't even have to complain, even a bit. I just explained the situation, he even remembered it and checked my info for shipping accuracy. Said no problem at all, he would let Anthony know what was up and get the correct ZO6 unit without the holes out to me.

Wow. I must say, I would not have blamed them at all for blowing me off or being annoyed but Bobby was polite and said it would all be taken care of right away. I even apologized for wasting their time with this nickel dime junk and he was like 'no problem at all'. You can really tell the companies that want to stay in business. If you follow good parts with good service you will always win. Now just hoping it gets here before my smog deadline is up.

Again wow, and thank you LG Motorsports.

 

Jaxian - My offer still stands if you're in a time crunch. Let me know.