P1416 code help... Not your usual questions.
Thread Starter
Racer
Joined: Dec 2000
Posts: 270
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From: Northridge CA
P1416 code help... Not your usual questions.
I have the stock intake (w/K&N) and stock exhaust manifolds. Been getting the P1416 code almost every day now, so I took a good hard look at the intake and found that the small 1/4" air line that used to connect to the stock accordian coupler (right in front of the throttle body on the driver's side) is GONE. Only the little hard plastic connector remains.
I suspect this to be the culprit. If so, where the heck does the other end of the air line connect to? I took the valve covers off and couldn't find an obvious place. Should I just plug it with something?
If that doesn't solve to be the problem, how the heck did some of you folks get at the "passenger side" check air valve?!? I followed the hard line off the right exhaust and the check valve is definitely behind the intake manifold. There is no way anybody's hand will reach back there. What's the trick?
Thanks.
[Modified by NoRice4Me, 3:34 PM 4/29/2003]
I suspect this to be the culprit. If so, where the heck does the other end of the air line connect to? I took the valve covers off and couldn't find an obvious place. Should I just plug it with something?
If that doesn't solve to be the problem, how the heck did some of you folks get at the "passenger side" check air valve?!? I followed the hard line off the right exhaust and the check valve is definitely behind the intake manifold. There is no way anybody's hand will reach back there. What's the trick?
Thanks.
[Modified by NoRice4Me, 3:34 PM 4/29/2003]
Burning Brakes
Joined: Feb 2003
Posts: 871
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Re: P1416 code help... Not your usual questions. (NoRice4Me)
Not sure which line you are speaking of, but almost all the time a P1416 code is caused by a bad passenger side air check valve - this of course is attached to your exhaust manifold, just off the hard line. Very common and cheap fix on our cars...
Le Mans Master
Joined: Dec 2000
Posts: 5,348
Likes: 3,318
Re: P1416 code help... Not your usual questions. (99blackFRC)
I just had this code and this was indeed the problem. And it is trivial. :)
Without a picture, I'm afraid I don't know what line you have that may be missing. I don't think a missing line to the throttle body or intake would throw this code, but who knows? Not I.
It just occured to me, is what you are missing the wire that comes from the temperature sensor?
[Modified by Elk, 4:17 PM 4/29/2003]
Without a picture, I'm afraid I don't know what line you have that may be missing. I don't think a missing line to the throttle body or intake would throw this code, but who knows? Not I.
It just occured to me, is what you are missing the wire that comes from the temperature sensor?
Not sure which line you are speaking of, but almost all the time a P1416 code is caused by a bad passenger side air check valve - this of course is attached to your exhaust manifold, just off the hard line. Very common and cheap fix on our cars...
[Modified by Elk, 4:17 PM 4/29/2003]
Thread Starter
Racer
Joined: Dec 2000
Posts: 270
Likes: 0
From: Northridge CA
Re: P1416 code help... Not your usual questions. (Elk)
I don't have a digital camera, so i'm gonna borrow this guy's picture. Basically, I'm missing the air line he's pointing to. It connects to the coupler and leads under the valve cover. The dealer has the part in stock (so they say), but they have no idea where it connects to and I don't see anything obvious.
Ok, I can't get this image to show up, so here's the link http://www.inficad.com/~ecrigg/vette...tic%20tube.JPG
[Modified by NoRice4Me, 5:08 PM 4/29/2003]
Ok, I can't get this image to show up, so here's the link http://www.inficad.com/~ecrigg/vette...tic%20tube.JPG
[Modified by NoRice4Me, 5:08 PM 4/29/2003]
Thread Starter
Racer
Joined: Dec 2000
Posts: 270
Likes: 0
From: Northridge CA
Re: P1416 code help... Not your usual questions. (99blackFRC)
Not sure which line you are speaking of, but almost all the time a P1416 code is caused by a bad passenger side air check valve - this of course is attached to your exhaust manifold, just off the hard line. Very common and cheap fix on our cars...
Maybe it's different for the different model years. Mine's a 98. Even on my 98 Z28, the passenger air check valve is right above the exhaust.
Burning Brakes
Joined: Jul 1999
Posts: 934
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From: Vegas
Re: P1416 code help... Not your usual questions. (NoRice4Me)
That's the vacumn line for the fuel pressure regulator. 97 and 98 models have it. 99+ moved to a fuel system without a fuel return line. That shouldn't be the cause but you want to have it connected for sure.
Thread Starter
Racer
Joined: Dec 2000
Posts: 270
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From: Northridge CA
Re: P1416 code help... Not your usual questions. (benelliwang)
That's the vacumn line for the fuel pressure regulator. 97 and 98 models have it. 99+ moved to a fuel system without a fuel return line. That shouldn't be the cause but you want to have it connected for sure.
I suspect this to be the cause of the P1416 code since it started showing up last November (right after the dealer replaced a dead water pump). It would have been the last time the intake was removed from the car, and they probably lost the vac line in the process. It's probably allowing air to leak in past the TB. I might as well fix it anyway. If it's not the cause of the code, I'll tackle the air check valve next.. Thanks.
Advanced
Joined: May 2002
Posts: 76
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From: Laguna Niguel CA
Re: P1416 code help... Not your usual questions. (NoRice4Me)
If it is the line I think you are talking about, it is a vacuum line which runs from the front of the fuel pressure regulator (driver's side middle of fuel rail). It connects to a hole in the accordian coupler from the air bridge to the throttle body. If the coupler has been replaced you will need to make your own hole. The vacuum controlled regulator I think were only on the 97 and 98 models. don't know if that is what causing the P1416 code, but that's what the line is for.
When I got that code P1416 the dealer diagnosed it as Bank1 air check valve. (part #022048212). Bank 2 valve failured about 20,000 after Bank ! failed.
When I got that code P1416 the dealer diagnosed it as Bank1 air check valve. (part #022048212). Bank 2 valve failured about 20,000 after Bank ! failed.
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Thread Starter
Racer
Joined: Dec 2000
Posts: 270
Likes: 0
From: Northridge CA
Re: P1416 code help... Not your usual questions. (dperretti1)
Hmm... There's already a line from the front of the fuel pressure regulator that is spliced into another air line on the passenger side of the TB. That probably means I can go ahead and plug the hole in the accordion coupler, since the air leak there is (probably) causing the P1416 code. Thanks!
Burning Brakes
Joined: Feb 2003
Posts: 871
Likes: 0
Re: P1416 code help... Not your usual questions. (NoRice4Me)
NoRice, sorry, I too was thinking Fbody again.. Yes, it is indeed mounted behind the intake and a PITA to get to. However, I can NOT possibly see how the line you are looking at could be causing a P1416. There is no logic to support that theory if you think about it. The two systems are not even remotely related. My $100 still says bad check valve ;)
Thread Starter
Racer
Joined: Dec 2000
Posts: 270
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From: Northridge CA
Re: P1416 code help... Not your usual questions. (99blackFRC)
When I searched the archives, it seemed that a few folks got rid of the code by fixing leaks in the intake (after doing some mods). Something about unmetered air getting in past the MAF.
If it ends up being the check valve, I'll need your $100 to have it fixed! :smash: :D
If it ends up being the check valve, I'll need your $100 to have it fixed! :smash: :D
Burning Brakes
Joined: Feb 2003
Posts: 871
Likes: 0
Re: P1416 code help... Not your usual questions. (NoRice4Me)
nah.. the valves are typically $12-$15 and swapping it out really isn't that bad.. just takes some time. The heads/cam/intake/headers/oil pump/pullies install I just completed took a whole lotta time however :D
Very interested to see what the outcome is however. The unmetered air thing is still a problem like you said since this is air that is not being measured by the MAF. Would definitely throw off your ltrim readings in turn causing the computer to max out it's fuel add adjustments (to it's max) Is the 1416 code the ONLY code you are seeing? Any P0171, 174's? Have a scanner?
[Modified by 99blackFRC, 12:27 AM 5/2/2003]
Very interested to see what the outcome is however. The unmetered air thing is still a problem like you said since this is air that is not being measured by the MAF. Would definitely throw off your ltrim readings in turn causing the computer to max out it's fuel add adjustments (to it's max) Is the 1416 code the ONLY code you are seeing? Any P0171, 174's? Have a scanner?
[Modified by 99blackFRC, 12:27 AM 5/2/2003]
Thread Starter
Racer
Joined: Dec 2000
Posts: 270
Likes: 0
From: Northridge CA
Re: P1416 code help... Not your usual questions. (99blackFRC)
So far so good. I plugged the hole Wednesday night, and I haven't gotten it again. I was practically getting it on every trip to or from work. I haven't gotten any other codes recently. I did get a P0113 IAT Sensor Circuit High Voltage-B about a month ago. When I looked, I found that the rubber bushing for the air bridge by the IAT was gone. Since the wires are kinda short I figured the air bridge was probably moving around too much and pulled at the IAT connector. I bought a replacement and haven't seen that code again. You don't think they're related?? Anyhow, I don't have a scanner. Never thought I was mechanically inclined enough to justify having one. :)
Man, you really have to inspect the car after getting it back from the dealer. They don't give any attention to detail. :boxing
Man, you really have to inspect the car after getting it back from the dealer. They don't give any attention to detail. :boxing
