P1415 while running hot, dying & surging???
Thread Starter
Safety Car
Joined: Sep 2000
Posts: 3,604
Likes: 395
From: Austin, TX
P1415 while running hot, dying & surging???
All,
For starters I haven't changed anything on my car since I did a H/C install a year or so ago (with an MTI tune). Been running great until recently.....
Recently I've been battling some surging problems at part throttle that reared its ugly head several weeks ago. I'm also having some idle surge and dying (mostly while hot). During that time I've also started throwing P1415 air injection (bank ) codes while running hot. I thought this code would get thrown at startup (i.e. while cold). I replaced the bank 1 check valve with no change, still getting the code.
I've check all the clamps between the air filter and the throttle body and I'm 99% sure there are no leaks. I've cleaned the MAF hot-wires as well but no luck. Changed the plugs, made sure all the plug wires have acceptable resistances with no luck.
At this point I'm thinking maybe the MAF or 02 sensors are shot or maybe even a vacuum leak.
Anyone have any experience with what could be left on the list of culprits?
TIA,
For starters I haven't changed anything on my car since I did a H/C install a year or so ago (with an MTI tune). Been running great until recently.....
Recently I've been battling some surging problems at part throttle that reared its ugly head several weeks ago. I'm also having some idle surge and dying (mostly while hot). During that time I've also started throwing P1415 air injection (bank ) codes while running hot. I thought this code would get thrown at startup (i.e. while cold). I replaced the bank 1 check valve with no change, still getting the code.
I've check all the clamps between the air filter and the throttle body and I'm 99% sure there are no leaks. I've cleaned the MAF hot-wires as well but no luck. Changed the plugs, made sure all the plug wires have acceptable resistances with no luck.
At this point I'm thinking maybe the MAF or 02 sensors are shot or maybe even a vacuum leak.
Anyone have any experience with what could be left on the list of culprits?
TIA,
Le Mans Master
Joined: Oct 2002
Posts: 6,772
Likes: 1
From: Tampa FL
if it were the maf it would be throwing a different code and you would have idling problems .. if it was a vaccum leak (around the tb) it would over-rev on startup sit around 1100 or so at idle ... leave off the connector from the air intake to to the TB and start the engine .. it's FUN 
. 
my brain is telling me to check the 02 sensors ..
did you say the code is only set when it's hot?
. my brain is telling me to check the 02 sensors ..
did you say the code is only set when it's hot?
Last edited by NSTG8R; Jul 15, 2006 at 04:55 PM.
Thread Starter
Safety Car
Joined: Sep 2000
Posts: 3,604
Likes: 395
From: Austin, TX
Originally Posted by NSTG8R
if it were the maf it would be throwing a different code and you would have idling problems .. if it was a vaccum leak (around the tb) it would over-rev on startup sit around 1100 or so at idle ... leave off the connector from the air intake to to the TB and start the engine .. it's FUN .
my brain is telling me to check the 02 sensors ..
did you say the code is only set when it's hot?
. my brain is telling me to check the 02 sensors ..
did you say the code is only set when it's hot?
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
I am battling a rich code bank 1 right now and I have recorded a ton of Autotap data. Bottom line, it doesn't make any logical sense. I am going to replace my driver's side O2 that I ordered from Fred Beans and see if that corrects it. I see the trim go off, but there is no ryme or reason for it. I am also H/C and this came out of the blue as well. The other thing that is recent, is the switch to ethanol. Not sure what that does in this equation, but I am very interested in how you resolve your problem even though we have different codes.
Le Mans Master
Joined: Oct 2002
Posts: 6,772
Likes: 1
From: Tampa FL
if it's only set when hot then i'd definitely check the 02s ..
the 02s are exempt for a certain period of time while the cats warm up .. at that point if the 02s aren't working properly, well, you get a code.
and if not the 02s .. maybe the wiring for them.
good luck.
the 02s are exempt for a certain period of time while the cats warm up .. at that point if the 02s aren't working properly, well, you get a code.
and if not the 02s .. maybe the wiring for them.
good luck.
Thread Starter
Safety Car
Joined: Sep 2000
Posts: 3,604
Likes: 395
From: Austin, TX
OK. So I spent all afternoon replacing the O2's. Ya gotta hate the drivers side with Kooks long tubes....
Replaced the fuel filter as well just to be thorough.
Took it for a spin, not sure if its fixed or not. I think it is but then again it seems like its still surging a bit but maybe this is my mind playing tricks on me.
We'll see how it goes over the next few days.
Replaced the fuel filter as well just to be thorough.
Took it for a spin, not sure if its fixed or not. I think it is but then again it seems like its still surging a bit but maybe this is my mind playing tricks on me.
We'll see how it goes over the next few days.
Le Mans Master
Joined: Oct 2002
Posts: 6,772
Likes: 1
From: Tampa FL
Originally Posted by PewterC5
OK. So I spent all afternoon replacing the O2's. Ya gotta hate the drivers side with Kooks long tubes....
Replaced the fuel filter as well just to be thorough.
Took it for a spin, not sure if its fixed or not. I think it is but then again it seems like its still surging a bit but maybe this is my mind playing tricks on me.
We'll see how it goes over the next few days.
Replaced the fuel filter as well just to be thorough.
Took it for a spin, not sure if its fixed or not. I think it is but then again it seems like its still surging a bit but maybe this is my mind playing tricks on me.
We'll see how it goes over the next few days.
.. if the code is gone then i'd say the one problem is solved.
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Thread Starter
Safety Car
Joined: Sep 2000
Posts: 3,604
Likes: 395
From: Austin, TX
Originally Posted by NSTG8R
how bad is teh surging? like between 100 rpm or more like 1000 rpm ..
.. if the code is gone then i'd say the one problem is solved.
.. if the code is gone then i'd say the one problem is solved.
We'll see how its goes tomorrow after I can get some more miles on her.
Thanks....
Melting Slicks
Joined: Sep 2003
Posts: 2,911
Likes: 1
From: Augusta GA
St. Jude Donor '05-'06
Sounds dumb, but what about the wires going to the O2 on that bank? Been there done that, car was fine when cold then whammy. I know wires should not shift and all but hey, things happen? Good luck brother!
Dave
Dave
Thread Starter
Safety Car
Joined: Sep 2000
Posts: 3,604
Likes: 395
From: Austin, TX
Originally Posted by chiefDave
Sounds dumb, but what about the wires going to the O2 on that bank? Been there done that, car was fine when cold then whammy. I know wires should not shift and all but hey, things happen? Good luck brother!
Dave
Dave
Thread Starter
Safety Car
Joined: Sep 2000
Posts: 3,604
Likes: 395
From: Austin, TX
OK, so replacing the O2's, didn't help at all.I haven't had another 1415 code but its still surging at light throttle especially on decelleration.
I've put the stock intake back on, no change.
I've triple checked the connections between the MAF and the throttle body, no change.
Replaced the O2's, no change.
Replaced plugs, no change.
Switched back to stock plug wires, no change. (except I destroyed one of my current ones....
)Replaced fuel filter, no change.
Check briefly for obvious vacuum leaks and don't see any.
Seems like the only thing I haven't done that I'm aware of is to replace the MAF.
Anyone else have any ideas from personal experience?
Is there a common list of places to check for vacuum leaks?
TIA,
Racer
Joined: Mar 2006
Posts: 265
Likes: 3
From: Metamora, IL
According to the step by step diagnosis in the service manual, you need a scanner to check the voltage of the O2 sensor during AIR system operation. (usually cold engine) You should make sure the check valves are working properly (both of them), no holes or kinks in the tubing, check to make sure the AIR system compressor is working. You should also check to make sure there are no restictions in the passage between the manifold and the AIR tubing. I don't know if Corvettes do it, but I have seen many air injection systems with rusted out metal tubing, especially on Ford vehicles. Also P1415 or P1416 indicates that only one side is working. This would lead me to look at the check valves or the tubing. If the light comes and goes, that is a strong indicator of a failing primary or secondary check valve. By the law of averages, it is likely to be the one on the back of the engine and not the one on the drivers side manifold. Good luck with your repair and let us know how what you find.
Thread Starter
Safety Car
Joined: Sep 2000
Posts: 3,604
Likes: 395
From: Austin, TX
Originally Posted by PewterC5
OK, so replacing the O2's, didn't help at all.I haven't had another 1415 code but its still surging at light throttle especially on decelleration.
I've put the stock intake back on, no change.
I've triple checked the connections between the MAF and the throttle body, no change.
Replaced the O2's, no change.
Replaced plugs, no change.
Switched back to stock plug wires, no change. (except I destroyed one of my current ones....
)Replaced fuel filter, no change.
Check briefly for obvious vacuum leaks and don't see any.
Seems like the only thing I haven't done that I'm aware of is to replace the MAF.
Anyone else have any ideas from personal experience?
Is there a common list of places to check for vacuum leaks?
TIA,
The drama continues.....today for the first time the car thew two IAT codes. Found a broken wire inside the connector at the IAT. Fixed that....and maybe...just maybe....my surging may be gone.
That being said, the stupid 1415 came back while hot. I've replaced the O2's and the check valve on bank-1. Guess I need to see if the pump is working or not.