Hey everyone I'm having a strange issue. So it started last year when I noticed I had the famous tick from the manifolds. I took the opportunity to just upgrade to long tubes,arp bolts,gaskets and new cats I put everything on after fighting with broken studs and got my tune from hemifever and everything seemed alright. Well, around comes winter and I'm getting a strong exhaust smell in my cabin when the heat is on. I thought maybe it was the gaskets that came with the headers I kinda put it off til it got a bit warmer out in the northeast. Last week I installed remflex gaskets and now I'm getting lean codes on both banks. Yesterday I checked to see if any bolts has gotten loose some were a little loose but not terrible. I re tighten everything and deleted the p0171 & p0174 codes. Driving around for about 10 minutes and both codes came back on again. Prior to me replacing the gaskets I never had these codes but a strong exhaust smell in the cab. Now the exhaust smell has gotten better ( not totally gone) but the lean codes are coming on. I don't wanna keep throwing different parts at this, was hoping to pick someone's mind and see what they think. I'm thinking I might have damaged the gaskets while putting them in? Thanks for any input.
This scenario is fraught with many opportunities for SWAG efforts at suggesting things to fix this issue.
The information, as I read it, is the truck is 11 years old. Nowhere is the mileage posted. Also, you state that a "tuner" person made changes to the factory algorithm of the ECM. That very statement removes any starting point/benchmark for proper diagnosis. Perhaps a full blown scanner screen shot of the vehicle PID's shown here would help. A shot of the freeze frame data is crucial, too. And DON'T forget the Mode6 data as well.
I have a customer who drove down to Houston from Austin (200+ miles) for me to diagnose the P0171/174 on his 2008 4Runner V-8 4.7L, AFTER having one dealer and 3 indy shops lightened his wallet for nearly 4 grand total over a 2 year period. And the parts cannon theory was, once again, proven WRONG!
He had a weak fuel pump and a oil treated (K&N style) air filter which contaminated the MAF sensor. I replaced those 2 things along with installing a factory air filter, and, VOILA!, it was fixed. Proper diagnostic and following the data was, and always will be the key to accurate repairs.
Meanwhile, he has new Plugs, coils, injectors, all 4 oxy sensors, all 4 new cats (pre and post), a timing belt, and a computer; he had it tuned, also, to no avail.
I had a 2013 Toyota Camry came in this weekend with a complaint of the A/C blowing hot air. After checking the computer network system for DTC,s (there were about 20 overall), and checking the oil (there was none on the stick), I added 3.5 quarts to the 4 quart sump, and cleared all the DTC's. Can you believe it! The A/C magically began to blow cold air again. 13 of the DTC's were the VVT and engine issues.... Gee! I wonder why the lack of nearly all the oil caused these issues (sarcasm).
I charged her a grand total of 50 bucks for the diags and oil. The engine is one of those 2.5L 4 cylinder ones which burn oil. She has over 200K miles on it.
