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Check Engine Light Code

Harley78

By Harley78
in Ask A GM Technician

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Harley78 Enthusiast

Harley78

Posted
Posted

As I perused through this site in regards to Codes P0101, P0171 & P0174, I have found out that I just paid +200 bucks to get that all fixed. Low and behold, light still comes on! Of couse they keep saying its my K&N filter! Is that possible? They replaced my MAF sensor, cleaned my filter along with replacement of my upper air intake gasket.

 

Now since they cannot seem to figure this out, I suppose its up to me! So what do you think my next step would be? I was thinking about taking out the diagnostic piece they use to test the vacuum and just making it one single vacuum hose! Does this sound like a good idea? I did have the above repairs done a month ago, but just tired of taking it to the dealer (Cup Car Owner) and hearing the same old thing.

 

Looking forward to your suggestions!

Supertech64 Enthusiast

Supertech64

Posted
Posted

I will say that our FOM has a similar vehicle to that under your name and had a K&N with the same codes comming on. We convinced him to change back to a stock filter and his problem dissapeared.

Harley78 Enthusiast

Harley78

Posted
  • Author
Posted
I will say that our FOM has a similar vehicle to that under your name and had a K&N with the same codes comming on. We convinced him to change back to a stock filter and his problem dissapeared.

 

 

Thanks for the info. I will go to the local junk shop and get a used one for $70 bucks and see how that goes. again, many thanks! Oh, so with this air box, do you suggest a K & N filter replacement or go with the standard one?

95Sierra2500 Senior Enthusiast

95Sierra2500

Posted
Posted

I have had a K&N on two different vehicles for a combined 50,000 miles and have had NO issues with MAF codes. In fact, the only vehicle I ever had MAF problems with, never had a K&N filter in it.

 

If you're getting MAF codes, clean the filter but DO NOT OVER-OIL IT. In fact, put on slightly less oil than the directions in the recharge kit call for. If you make it just barely pink, it will be just right. I'll bet your problems will go away.

Harley78 Enthusiast

Harley78

Posted
  • Author
Posted

Well, this problem showed up about 6 months after I bought this vehicle (its now been two years) from the dealer. Everytime I brought it in, they could not diagnose the problem, everything was fine. Then finally (month ago) they found a problem and replace the upper exhaust gasket, replace the MAF and cleaned the K&N filter. low and behold it came on the very next day.

 

Oh and thanks all for the suggestions....

Norseman Senior Enthusiast

Norseman

Posted
Posted
Well, this problem showed up about 6 months after I bought this vehicle (its now been two years) from the dealer. Everytime I brought it in, they could not diagnose the problem, everything was fine. Then finally (month ago) they found a problem and replace the upper exhaust gasket, replace the MAF and cleaned the K&N filter. low and behold it came on the very next day.

 

Oh and thanks all for the suggestions....

 

 

Put the K&N in here ---> 180px-Bin.JPG

grampadirt Senior Enthusiast

grampadirt

Posted
Posted

The codes P0171 & P0174 refer to lean conditions,what about an intake manifold leak or something like that.Wouldn't that create a lean condition? maybe a gasket leak somewhere else? I've sprayed WD40 around the intake man. and when the idle changes or the engine stumbles there's the leak.I did this on older engines and not the new(er) ones.But a leak is a leak.

 

Gary

GRB Enthusiast

GRB

Posted
Posted
The codes P0171 & P0174 refer to lean conditions,what about an intake manifold leak or something like that.Wouldn't that create a lean condition? maybe a gasket leak somewhere else? I've sprayed WD40 around the intake man. and when the idle changes or the engine stumbles there's the leak.I did this on older engines and not the new(er) ones.But a leak is a leak.

 

Gary

 

I have had a intake manifold leak on my 97 tahoe in the past. It can create a vacum condition within the crankcase. If you remove the oil cap quickly and engine ideal stutters it might be leaking. I replaced the gasket (actually rubber seal) and it's not much fun, took about 7 hours total... Good luck

pennzoil29 Senior Enthusiast

pennzoil29

Posted
Posted
The codes P0171 & P0174 refer to lean conditions,what about an intake manifold leak or something like that.Wouldn't that create a lean condition? maybe a gasket leak somewhere else? I've sprayed WD40 around the intake man. and when the idle changes or the engine stumbles there's the leak.I did this on older engines and not the new(er) ones.But a leak is a leak.

 

Gary

 

I have had a intake manifold leak on my 97 tahoe in the past. It can create a vacum condition within the crankcase. If you remove the oil cap quickly and engine ideal stutters it might be leaking. I replaced the gasket (actually rubber seal) and it's not much fun, took about 7 hours total... Good luck

 

+1. Take the oil fill cap off while the truck is running. The s.o.b. will sound like a Hoover if you have an intake leak.

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