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Old Feb 21, 2025 | 07:53 AM
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Default Air filter question

Hey everybody, probably a dumb question but I figured I'd ask. My car definitely needs a new filter. It's been a long time. I was wondering if it is better to just replace the filter for now or get one of the cheaper cold air intakes off Amazon. The K&N filter is actually more than the basis ram air. I'm eventually going to get a good one like the Vararam cold air intake, just can't do it right now (probably dropped too much on the stereo lol). Any chance the reduction in airflow can trigger 1120 and 1121 error? TPS is ACDelco and is new. My next step is to clean the throttle body and make sure it's moving freely.

Thanks.

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Feb 21, 2025, 08:09 AM
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Originally Posted by Johnnyv49
Hey everybody, probably a dumb question but I figured I'd ask. My car definitely needs a new filter. It's been a long time. I was wondering if it is better to just replace the filter for now or get one of the cheaper cold air intakes off Amazon. The K&N filter is actually more than the basis ram air. I'm eventually going to get a good one like the Vararam cold air intake, just can't do it right now (probably dropped too much on the stereo lol). Any chance the reduction in airflow can trigger 1120 and 1121 error? TPS is ACDelco and is new. My next step is to clean the throttle body and make sure it's moving freely. Thanks. ​​
Aftermarket CAIs are a waste of money in my opinion. Replace the filter element with a quality OEM replacement and be done with it. It is doubtful that a clogged filter is causing you DTC 1120 or 1121. Your best course of action to troubleshoot those DTC is to follow the troubleshooting steps in the FSM.
Old Feb 21, 2025 | 08:09 AM
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Originally Posted by Johnnyv49
Hey everybody, probably a dumb question but I figured I'd ask. My car definitely needs a new filter. It's been a long time. I was wondering if it is better to just replace the filter for now or get one of the cheaper cold air intakes off Amazon. The K&N filter is actually more than the basis ram air. I'm eventually going to get a good one like the Vararam cold air intake, just can't do it right now (probably dropped too much on the stereo lol). Any chance the reduction in airflow can trigger 1120 and 1121 error? TPS is ACDelco and is new. My next step is to clean the throttle body and make sure it's moving freely. Thanks. ​​
Aftermarket CAIs are a waste of money in my opinion. Replace the filter element with a quality OEM replacement and be done with it. It is doubtful that a clogged filter is causing you DTC 1120 or 1121. Your best course of action to troubleshoot those DTC is to follow the troubleshooting steps in the FSM.
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Old Feb 21, 2025 | 08:09 AM
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Originally Posted by Johnnyv49
My car definitely needs a new filter. It's been a long time.
​​
What does it have now? Stock?

Originally Posted by Johnnyv49
I was wondering if it is better to just replace the filter for now or get one of the cheaper cold air intakes off Amazon.​​
No....and do not buy any car parts off Amazon.

Originally Posted by Johnnyv49
The K&N filter is actually more than the basis ram air.​​
No idea what you mean here.


Originally Posted by Johnnyv49
I'm eventually going to get a good one like the Vararam cold air intake​​
Not worth the money or installation frustration IMO.

Originally Posted by Johnnyv49
Any chance the reduction in airflow can trigger 1120 and 1121 error?
No....and there is no such DTC P1121. Perhpas you mean P1221? In any case, you need a scanner to evaluate what is going on. I would be inspecting the associated wiring.







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Old Feb 21, 2025 | 08:34 AM
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Air filters are an inexpensive disposable part of the air incoming into your engine. A clogged filter will eventually restrict the air flow and can cause DTC codes to activate. The K&N dual cone filters actually lose hp because the airflow speed slows down when passing the thru the MAF.
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Old Feb 21, 2025 | 09:11 AM
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Originally Posted by Gordy M
A clogged filter will eventually restrict the air flow and can cause DTC codes to activate.
Perhaps, but not the codes provided by the OP.
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Old Feb 21, 2025 | 10:16 AM
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Typo on the codes sorry: 1120,1125,1221

That's kind of what I figured on the air filter. Maybe I'll upgrade to the k&N (below) just because it's washable. I have one in my truck and like it. For cold air intakes in the future any suggestions on best one? Worth the money on a stock car?

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Old Feb 21, 2025 | 10:34 AM
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Originally Posted by Johnnyv49
Worth the money on a stock car?
No. Stock engine, just choose a good name brand filter.
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Old Feb 21, 2025 | 10:35 AM
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Originally Posted by Johnnyv49
For cold air intakes in the future any suggestions on best one? Worth the money on a stock car?
No.
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Old Feb 21, 2025 | 11:57 AM
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Maybe a Z06 air filter box holder, if they're still available, or the "zip-tie mod"............
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Old Feb 21, 2025 | 12:07 PM
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Thanks everyone
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Old Feb 23, 2025 | 04:31 PM
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The problem with the K&N washable/oiled filters are even though they allow more air flow, they also allow more particulates to pass through. I just order a stock WIX from Rockauto when I order some other stuff.

I had a K&N on my street rod and it was a PIA to wash, let dry, and then re-oil. I eventually replaced it with a regular filter.
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Old Feb 24, 2025 | 01:00 PM
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Cold air intakes do not really add anything.

K&N filters can be cleaned and are good but do not over oil them. Easy to clean and easy to over oil and take out the mass air.

Even the Zip tie and the Z06 lid add little to nothing. The intake on this car is pretty good from the factory. Most performance cars see little gain but non performance can see some gains due to restrictions if they are mass air.
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Old Feb 24, 2025 | 07:21 PM
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Well I took the air filter box off today and evidently it already has the k&n filter I guess my filter question is handled.
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Old Mar 1, 2025 | 11:47 AM
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Originally Posted by Gordy M
Air filters are an inexpensive disposable part of the air incoming into your engine. A clogged filter will eventually restrict the air flow and can cause DTC codes to activate. The K&N dual cone filters actually lose hp because the airflow speed slows down when passing the thru the MAF.
And they are sucking stagnant, warm air from the engine compartment, vice the coolest, highest-pressure air available from the outside of the car.
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Old Mar 1, 2025 | 06:47 PM
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Originally Posted by Eliot Ness
The problem with the K&N washable/oiled filters are even though they allow more air flow, they also allow more particulates to pass through. I just order a stock WIX from Rockauto when I order some other stuff.

I had a K&N on my street rod and it was a PIA to wash, let dry, and then re-oil. I eventually replaced it with a regular filter.
I too prefer stock air filter boxes and quality paper filters. On my Subaru race car I am getting rid of the cold air intake, and going back to stock because keeping dirt out of the engine is more important than minimal hp gains.

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Old Mar 1, 2025 | 08:21 PM
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Well the K&N filter is actually inside the box so it should be grabbing air from the outside just like the stock I would assume. I actually had no idea it was there until I took the cover off to replace the filter
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Old Mar 2, 2025 | 08:42 AM
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The stock air cleaner and all aftermarket air cleaners other than 3 or 4 use air heated by the engine. The engine compartment.is somewhat closed to outside air, your MAF determines the speed of the incoming air and adjust the fuel and spark etc. requirements. Cooler air is more dense and hence contains slightly more oxygen per cylinder and burns more efficiently.
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