Hola everyone!!!

I noticed last week while I was driving my truck that "she" wanted to die on me for a second. Then everthing went back to normal but a few miniutes later it happened again! I tried giving more gas but it didnt responed. I could see my RPM going up and down like it was starving for gas!?
I made it home and thought to myself, lets see how "she" acts the next day! The next day everything was fine, like it never happened!
Well this weekend "she" went crazy! One second it would be driving great, the next second the truck would be acting up again!

This morning I drove it for about 10 mins hard and no problems!!?? Waht gives!!!

It sounds like a fuel issue to me!
I have a Walbro 190 LPH fule pump. I have had the fuel pump for about 3 years now and replaced my fuel filter about 9 mouths ago.

Could I be way off track?????

Any help would be great!

 

need more info. model, age, mileage give details.....

 

O that does help....silly me!

2003 3.4 Tacoma with 77,600 miles.

Thanks

 

I just had the same problem yesterday. Check your intake box for fuel. I had fuel coming from the evap box going to my intake box for some reason. Mine was really bad though, I had copious amounts of fuel being poured out. If you show similar symptoms, let me know.

 

Why do you have a Walbro 190lph fuel pump? Are you supercharged?

 

This morning I pulled off my intake(after market, Injen) and noticed that my air sensor was very dirty. I cleaned it off with a tooth brush. I still dont think thats the problem but you never know.

Is the evap box coming from the 1st (closet to the fan)or 2nd(closet to the TB) hose going to the intake?

 

I am run a 75 shot of nitrus.

 

1st hose I believe. Do you smell raw fuel at all when you pop the hood?

 

Nope I couldnt smell alot of fuel when opening to hood.

 

Ok. We may have different issues then. If it gets worse though, and you do start to smell fuel, send me a PM.

 

You got it TR!
Thanks for the help!!!

 

have you tried resetting your ECU by pulling the EFI fuse for a minute?

 

Nope Mastcox, great idea!!!!
Where is the fuse tho!

 

Under the hood, the box with all the fuses in it, itll tell you which one is the efi

 

The air sensor outlined in white was super dirty!!!!!

 

you spray it with electrical parts cleaner too when you cleaned it? and a q-tip?

Edit: isnt there another diode down the center of it too? i cant remember, cleaned my buddies a while back ago and cant remember, if there is clean that one too.

 

Ok I removed the fuse for about 5 mins.
Thanks for the advice Steveo3!

I will also get some eletrical cleaner spray and clean the air sensor. You are right, their is a little sensor inside.
If the outside sensor was that dirty, the inside was will be really dirty too!

 

yeup, my buddies was caked with crud on it, once it was cleaned the p0171 code went away. and he got way better acceleration out of it.

And no problem, thats what were all here for right

 

RIGHT!!!!!

 

Does the engine do this after a full-throttle nitrous run, or just part-throttle driving around town?

Assuming you have a single-point wet shot of nitrous, have you checked it's injector?