check engine light stays on

[dre1012]

I installed a k&n intake system on my 2003 gmc yukon about 2 months ago.Worked great and sounded realy good.Recently took my truck in for service and found out that the intake is destroying the sensors in the truck.I was told because of the new intake taking in so much more air than stock it is setting off all the sensors thus making my check engine light come on.Has anyone else had this problem because i am ready to put the factory air intake back on and just call this a lost.

[94 Jimmy]

What codes are you setting?
I have a K&N on my Yukon and it works fine. Some auto parts stores will read the codes for you or perhaps the service outfit will give them to you. If you post them then we can make some suggestions.
Generally reducing the resistance to flow in both the intake and exhaust is a good thing. The better the flow the more efficient the engine. I have even run my engine without an air cleaner without setting a code, not a good idea, but it works. On the other extreme, my son has come home with the K&N in the Jimmy completely blocked with mud, really not a good idea, but no codes.
You got something else going on, perhaps O2 sensors if you have over 50KMi, bugs in the Mass Air Flow who knows without the codes.
Hope to hear from you soon
94

[dre1012]

Originally Posted by 94 Jimmy

What codes are you setting?
I have a K&N on my Yukon and it works fine. Some auto parts stores will read the codes for you or perhaps the service outfit will give them to you. If you post them then we can make some suggestions.
Generally reducing the resistance to flow in both the intake and exhaust is a good thing. The better the flow the more efficient the engine. I have even run my engine without an air cleaner without setting a code, not a good idea, but it works. On the other extreme, my son has come home with the K&N in the Jimmy completely blocked with mud, really not a good idea, but no codes.
You got something else going on, perhaps O2 sensors if you have over 50KMi, bugs in the Mass Air Flow who knows without the codes.
Hope to hear from you soon
94

I am not sure what codes are being set off but they said I need to replace mass air flow sensor and the 02 sensors if that is any help

[94 Jimmy]

O2 sensors, MAP are my guess. Check in with one of the big brand autoparts stores in your area. Many of them will read the codes for you, no use just shotgunning parts at $80-100 each.
If you want to do the work yourself we can suggest some procedures, but again it would be nice to know what needs changing. Also what size engine do you have and how many miles on it.
The replacement of either of these parts is not a big problem, but if your not comfortable with the work you might just want to buy the parts and take them to a shop and have them replaced. Shops usually buy the parts from the same stores you shop at, the parts stores often deliver free, but the mechanic will double or triple the cost to you, then charge you to put it in.
Do a little more homework, if your interested in getting into maintaining your own truck this is a good place to start.
See ya
94

[dre1012]

[quote=94 Jimmy]O2 sensors, MAP are my guess. Check in with one of the big brand autoparts stores in your area. Many of them will read the codes for you, no use just shotgunning parts at $80-100 each.
If you want to do the work yourself we can suggest some procedures, but again it would be nice to know what needs changing. Also what size engine do you have and how many miles on it.
The replacement of either of these parts is not a big problem, but if your not comfortable with the work you might just want to buy the parts and take them to a shop and have them replaced. Shops usually buy the parts from the same stores you shop at, the parts stores often deliver free, but the mechanic will double or triple the cost to you, then charge you to put it in.
Do a little more homework, if your interested in getting into maintaining your own truck this is a good place to start.
See ya
94[/QUTE]
I have a 5.3 litre with 36500 miles

[dre1012]

I have a 5.3 litre with 36500 miles.I dont mean to sound stupid but how do i go about getting a store to tell me the codes that are wrong.

[dre1012]

[quote=dre1012]

Originally Posted by 94 Jimmy

O2 sensors, MAP are my guess. Check in with one of the big brand autoparts stores in your area. Many of them will read the codes for you, no use just shotgunning parts at $80-100 each.
If you want to do the work yourself we can suggest some procedures, but again it would be nice to know what needs changing. Also what size engine do you have and how many miles on it.
The replacement of either of these parts is not a big problem, but if your not comfortable with the work you might just want to buy the parts and take them to a shop and have them replaced. Shops usually buy the parts from the same stores you shop at, the parts stores often deliver free, but the mechanic will double or triple the cost to you, then charge you to put it in.
Do a little more homework, if your interested in getting into maintaining your own truck this is a good place to start.
See ya
94[/QUTE]
I have a 5.3 litre with 36500 miles

I dont mean to sound stupid but how do I go about gettting a store to tell me what codes are wrong.What do I need to do.

[2000CAYukon]

Originally Posted by dre1012

I have a 5.3 litre with 36500 miles.I dont mean to sound stupid but how do i go about getting a store to tell me the codes that are wrong.

Autozone will connect a code reader (like this one http://www.actron.com/product_detail.php?pid=16298) which will read all of the stored codes (there may be more than one). Write down the codes. There are many websites that list all of the codes (like this one http://www.obd-codes.com/trouble_codes/index.php).

//2000CAYukon

[GMMerlin]

Originally Posted by dre1012

I installed a k&n intake system on my 2003 gmc yukon about 2 months ago.Worked great and sounded realy good.Recently took my truck in for service and found out that the intake is destroying the sensors in the truck.I was told because of the new intake taking in so much more air than stock it is setting off all the sensors thus making my check engine light come on.Has anyone else had this problem because i am ready to put the factory air intake back on and just call this a lost.

Probally what has happened is the oil from your filter has contaminated the MAF sensor (not uncommon with oil bath filters such as K@N).
Clean your filter and oil SPARINGLY.

[dre1012]

Originally Posted by GMMerlin

Probally what has happened is the oil from your filter has contaminated the MAF sensor (not uncommon with oil bath filters such as K@N).
Clean your filter and oil SPARINGLY.

What would you suggest doing besides replacing the sensors and maf meter put the old intake back on on keep the k&n on.You have been a big help.

[dre1012]

Originally Posted by dre1012

What would you suggest doing besides replacing the sensors and maf meter put the old intake back on on keep the k&n on.You have been a big help.

the codes that i have are p0101,p0300,p0430

[GMMerlin]

Originally Posted by dre1012

the codes that i have are p0101,p0300,p0430

I start to wonder with the P0430 and P0101 that you may have a clogged convertor that is causing your problems.
I would check for excessive back pressure on the Bank 2 convertor.

[MT-2500]

Now you have done it.
Now you need to undo it.
Your Yukon does not like the K&N filter.
Do not start throwing parts at it.
Get some electrical cleaner and clean the K&N oil off of the mass air flow elements. Just spray them good and let dry.
Clear codes and see what it does.
You need wash and remove the oil from that K&N filter which is you main problem.
Or just stick it behind the rear wheel and back over it and put a good OEM AC-delco filter back on it before you go into the dealer for warranty.
If the cat does come up bad it has a 7 year 70k emmisions warranty on it if they do not see the K&N on it.
Her is some info on K&N filters.
home.usadatanet.net/~jbplock/ISO5011/SPICER.htm
MT-2500

[rgloston]

If I remember correctly, that P0430 code (Catalyst Efficiency Below Threshold - Bank 2) means the pass side cat is bad. If you're under 80K miles (which looks like you are), get to a GM Service Center, tell them what code your vehicle alerts you to, and tell them that #2 (pass side) cat needs replacing.

GM (per Federal law) is obligated to change out any faulty emissions components under 80K miles driven, not 70K. Search the EPA's website. This was told to me when my '02 Yukon gave that code @ 79,865 miles driven. Can we say free replacement of entire y-pipe, both cats, and sensors. That's a $800 job at no cost (labor included).

Note: you can disable/clear that DTC, and it'll show up about 1 - 2 weeks later. That's a seperate problem from the P0101 & P0300 codes. A dirty MAF could cause the PCM to overcompensate for timing, spark, and fuel delivery. Those are likely to be related. The P0430 could be an effect of the other codes, but will not clear itself once contaminated. This advice came from a Service Manager I trust. Hadn't had any problems since.

[MT-2500]

Code 420\430 does not always mean the cat is bad.
Ckeck the link below on info and test for code 420/430
MT-2500
http://www.troublecodes.net/articles/catfailure/