Help. Check Gas Cap after FAST install
Advanced
Joined: Jul 2007
Posts: 63
Likes: 31
From: Fairfield California
Guy I haven't had a chance to pull my throttle body off to look at this, but when the car is idling, that port definitely pulls vacuum so the port is at least somewhat open. If I stick a drill bit in the port, it stops about 3" in however.
Is that port supposed to be completely open clean through to the plenum? Are the ones you are seeing blocked completely blocked are or they partially blocked? I can take the throttle body off again and drill it out but thought I'd ask first.
Is that port supposed to be completely open clean through to the plenum? Are the ones you are seeing blocked completely blocked are or they partially blocked? I can take the throttle body off again and drill it out but thought I'd ask first.
Trust me on this one, even partially blocked you'll still trigger a code. That port needs to be open clean through into the plenum, as Spin indicated, just remove your throttle body and drill out the port so that you can see that you are all the way through into the plenum. Once you do that I think you should be just fine.
Good Luck
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
Hey JOE G,
Trust me on this one, even partially blocked you'll still trigger a code. That port needs to be open clean through into the plenum, as Spin indicated, just remove your throttle body and drill out the port so that you can see that you are all the way through into the plenum. Once you do that I think you should be just fine.
Good Luck
Trust me on this one, even partially blocked you'll still trigger a code. That port needs to be open clean through into the plenum, as Spin indicated, just remove your throttle body and drill out the port so that you can see that you are all the way through into the plenum. Once you do that I think you should be just fine.
Good Luck
Thanks for the tip, I'll knock it out tonight hopefully!
Safety Car
Joined: Jan 2006
Posts: 4,598
Likes: 78
From: Miami FL
2020 C6 of the Year Finalist - Unmodified
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16,'17,'18-'19-'20-'21-'22
My FAST 92 had the evap hole completely plugged. A standard 5/32" drill bit can be chucked in a drill to leave 2-3/4" available. When I drilled all the way thru, with the chuck just kissing the plastic, about 1/8" of drill bit was sticking through on the inside. If Joe_G is really getting blockage at 3", it is because something is sittin' in the middle of his manifold !!
Mine is finally going back together tomorrow night, so this information was QUITE TIMELY !! Thanx, Corvette Forum.
Mine is finally going back together tomorrow night, so this information was QUITE TIMELY !! Thanx, Corvette Forum.
Pro
Joined: Apr 2005
Posts: 702
Likes: 82
From: Ronkonkoma NY
St. Jude Donor '08-'09
Would you happen to have any pics, of the location of this port? I have the same thing happening after the fast install.
Hey JOE G,
Trust me on this one, even partially blocked you'll still trigger a code. That port needs to be open clean through into the plenum, as Spin indicated, just remove your throttle body and drill out the port so that you can see that you are all the way through into the plenum. Once you do that I think you should be just fine.
Good Luck
Trust me on this one, even partially blocked you'll still trigger a code. That port needs to be open clean through into the plenum, as Spin indicated, just remove your throttle body and drill out the port so that you can see that you are all the way through into the plenum. Once you do that I think you should be just fine.
Good Luck
Thread Starter
Melting Slicks
Joined: Sep 2005
Posts: 2,184
Likes: 78
From: Corpus Christi Texas
It's the port on the front side of the intake, next to the throttle body, and on the drivers side. The hard black plastic purge line attaches to it when installed. I'm sure someone has a picture somewhere.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
I doubt your's is plugged.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Safety Car
Joined: Aug 2006
Posts: 4,206
Likes: 6
From: Makena, Maui & NM
My FAST 92 had the evap hole completely plugged. A standard 5/32" drill bit can be chucked in a drill to leave 2-3/4" available. When I drilled all the way thru, with the chuck just kissing the plastic, about 1/8" of drill bit was sticking through on the inside. If Joe_G is really getting blockage at 3", it is because something is sittin' in the middle of his manifold !!
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
I bought mine a week before SEMA so late October...I must have the problem as I get a check gas cap every time I drive now (I reset it each time) and my gas cap is perfect. One time had a problem with my cap not "catching" but it's been working perfectly now for a while.
I'll drill it out this weekend and report back.
I'll drill it out this weekend and report back.
Pro
Joined: Apr 2005
Posts: 702
Likes: 82
From: Ronkonkoma NY
St. Jude Donor '08-'09
Joe, Please let me know if you have any sucess when you drill it out and what method you used.. I assume you're going to do it while the manifold is still on. Craig (Craigster05) and I attempted to fix mine yesterday, but ran into clearence issues with the alternator bracket and drill. We even went to sears and bought a mini right angle drill but that was to big as well. I'm going to look for some smaller type of righ angle drill today but I'm not optimistic.. I kind of think the mainfold may have to come off to get it done.. I hope you have better luck.
I bought mine a week before SEMA so late October...I must have the problem as I get a check gas cap every time I drive now (I reset it each time) and my gas cap is perfect. One time had a problem with my cap not "catching" but it's been working perfectly now for a while.
I'll drill it out this weekend and report back.
I'll drill it out this weekend and report back.
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
Joe, Please let me know if you have any sucess when you drill it out and what method you used.. I assume you're going to do it while the manifold is still on. Craig (Craigster05) and I attempted to fix mine yesterday, but ran into clearence issues with the alternator bracket and drill. We even went to sears and bought a mini right angle drill but that was to big as well. I'm going to look for some smaller type of righ angle drill today but I'm not optimistic.. I kind of think the mainfold may have to come off to get it done.. I hope you have better luck.
Thread Starter
Melting Slicks
Joined: Sep 2005
Posts: 2,184
Likes: 78
From: Corpus Christi Texas
Try a sharp drill bit using just your fingers. Would probably work but take a while. I'd presume it would be better than removing the manifold. Worth a shot. Basically it's plastic, so the sharp bit should work.
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
Hmm.. I've got some drill bits that have an adaptor fused to them that fits in a standard cordless drill chuck, I could use a ratchet and socket to turn it, but that would be pretty slow work! Gotta balance that out with just taking the manifold off which is about 15 minutes.