1st Gen Lunchtable Thread - General Discussion

10-4 rubber duck

 

Alright I’m probably gonna need one of you wizards to help me out with a painful P0171 code I’ve been chasing for god knows how long

 

P0171 can be caused by a lot of things. Is your MAF clean, is there a vacuum leak, O2 sensors okay?

I fixed mine by cleaning the MAF.

 

Have you tried cleaing your maf

 

Lmao.. laundry list of things. Supercharged engine. From front to rear.... filter was cleaned (oiled filter) filter was replaced and meticulously oiled and let sit so oil would not mess with MAF. Absolutely every possible place a vacuum leak could occur has been once, twice and thrice gone over with carb cleaner, even went with a 2.65 pulley to see if that would help, new bypass valve, no exhaust leaks, new upstream O2 sensor, 7th injector kit was put on, and water/meth kit was put on. My dad has the truck and is trying to get its emissions good so I can get it registered before I get back home from deployment

 

Clean the MAF again, lose the 'oiled' filter and see where things are at...

 

Oh forgot to mention, he just replaced the MAF like 20 minutes ago with no luck still. Hence this post.

 

I was about to say, the oiled filter is terrible at doing its job. Oil will get all over the probes of the MAF no matter what.

 

But the filter is still in there. Lose it. Not worth the hassle imo

 

I’ll hbe to see if they have a dry cone filter then. It’s not a drop in filter otherwise I would have stayed the hell away from oiled. Previous owner put on a k&n and I never got around to putting
That back to stock

 

When I get my SC, I’m going to end up ditching mine unless I find a dry filter for a good price.

 

I bet you it’s still the cold air intake. I get that code every one or two months until I clean it with MAF cleaner and reset the code.

 

Honestly I could give a shit about the code, I just want it to pass emissions so I can get it registered. It’s AZ emissions

 

If it hasn’t gone away with a new clean MAF, then it has to be something else.

 

Yeah that’s what I’m saying except I feel like I’ve done absolutely everything I can.

 

Just put it back to stock now. Dump that K&N. Don't want a paper filter, get an AFE Pro Dry drop in (non oil but washable). I've had one for 5+ years, never an issue.

 

Could be o2 sensors too. Have you checked those?

If you’re absolutely certain you’ve checked every vacuum line and fitting then we can rule that out.

 

The only reason I keep it is because the sound it makes is lovely. Can’t get that with stock unless I cut a hole in the air box, which will render me delinquent when it comes to emissions testing.

 

I replaced the afr sensor. As for the hoses and such... I’ve probably used 4-5 cans of carb cleaner trying to find a leak with absolutely no luck.

 

https://www.obd-codes.com/p0171

The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor Possible cracked vacuum or PCV line/connection Faulty or stuck open PCV valve Failed or faulty oxygen sensor (bank 1, sensor 1) Sticking/plugged or failed fuel injector Low fuel pressure (possible plugged/dirty fuel filter!) Exhaust leak between engine and first oxygen sensor