P0171 - System too Lean - Bank 1

i tripped this code just putting around town this morning, and my VSC, Trac Off, and Check Engine lights popped on after i noticed the idle fluctuating and the past few stop lights in town, it still runs and drives normally... any ideas?

see my mods in my profile, it's on the '05 BOP.

 

clean your MAF and reset your cpu by pulling the EFI fuse under your hood

 

Yup , clean the MAF with electrical cleaner sold at any auto store, easy stuff.

 

If that doesn't do it check for missing vacuum hoses and exhaust leaks. Let us know what you find.

 

cleaned the maf, and re-set the ecu, i found the problem, the intake pipe popped off the throttle body, but now i have a new problem... in both neutral and any foward gear, it hiccups and burps and bucks between 2000 and 4500 RPM, then pulls normally up to redline, no check engine light, and it idles normally, all the vacuum hoses are good, and the exhaust is all how it's supposed to be, also i notice the exhaust smells lean as hell.

any thoughts?

 

might be relearning?

 

You said you found the problem , the intake fell off.
You might want to check the piece of hose that connects the intake to the TB , might be damaged

your stumbling can be caused by a fouled injector , could cause a lean condition or a vacuum leak down stream of the MAF sensor ( mounting hose on the intake @ the TB)

Or , worse case , Your MAF was fried during this problem/repair.
The MAF sensor gets real hot during operation and having the intake fall off may have caused damage to it . If it got hot enough it could melt the silicone that the MAF components are sealed with and fouling it , causing it to run lean still.

 

try disconnecting the battery for a couple minutes then re connecting it. Also could be a bad first 02 sensor causing it to run lean. If it was an injector it would misfire. Could aslo be a bad maf. Both are hard to tell unless you have a scan tool to read the voltages.

 

" it hiccups and burps and bucks between 2000 and 4500 RPM"
sounds like a misfire to me

 

id say do a little clean up of the MAF sensor...same lights, same idle problem when mine went bad.

 

It is a misfire but a bad injector will cause a misfire at idle thats what I'm trying to explain.

 

turns out it was a TPS sensor...

 

Do you have a copy of the TPS report? Let me go get you another one just in case. And I'm going to need for you to come in on Sunday as well.

 

Hmmmm... This might be causing my car to be screwy...

first its lean then rich then lean... I was thinking it was my emanage but its still doing it n/a...

How did you eventually figure out what the dealio was?

 

it sat for 8 months till i finally took the stupid thing to the toyota dealer... and after a month, they replaced the TPS and told me to just get my stupid car out of their service department.