sputtering engine

[ware8083]

I recently bought my first tahoe last month a 2001 5.3 4x4. prev owner kept no service records but oil changes. I bought with check engine light on and took it to autozone and it was of course 02 sensor, i havent had time to replace yet. this morning my wife was driving and about 20 miles from our house it started sputtering and acted like it wanted to die but she made it home without it stalling. will the o2 sensor cause this or would there be something else going on?

 

[Polecat]

yes, it very well could cause it.

 

[ware8083]

would it also be possible to be a stuck egr valve. i have a 94 blazer 4.3l that acted pretty close to the same when its egr stuck.

 

[Polecat]

yep, the way these new computer controlled engnes, one thing can hamper many other things.

 

[ware8083]

i got a actron it reads a code of P0420 which is o2 sensor in back 1. is this the pass or driver side one?

 

[unlukky]

i got a actron it reads a code of P0420 which is o2 sensor in back 1. is this the pass or driver side one?

I believe that bank 1 is left and bank 2 is right.
2 per side, one 'before' and one 'after' the cat.

 

[tspain]

I believe that bank 1 is left and bank 2 is right.
2 per side, one 'before' and one 'after' the cat.

That's right. They are refered to as Bank 1 Sensor 1, Bank 1 Sensor 2. That's drivers' side front (1) and rear (2). Bank 2 is the pass. side (right side).


Also, try cleaning out your throttle body. If it is dirty and hasn't been cleaned in a while, it will cause a low idle, and stalling.

 

[ware8083]

thanks for the info. i replaced o2 sensor. no change except it wont start at all now. I changed fuel filter just cause it looked dirty, while i had it off i turned key to on and fuel came out. got new filter on and it started up and i pushed gas and it died and wont start again. put fuel gage on and i got no pressure at all. is there any other way to varify fuel pump is bad? i dont even hear pump come on at all now.

 

[greengumby]

hope you didnt pay much for the truck

 

[chrias]

If you're getting little to no pressure after priming the fuel system a few times then your fuel pump is dead and needs to be replaced.

 

[ware8083]

finally got time to work on the tahoe. got in my new fuel pump from jobberonline.com for $125 that was with shipping. and it runs great thanks for everyones help.

 

[thearch]

The fuel preassure regulator could be bad that is a come part that fails it is on you fuel rail. Don't forget to always check you battery terminals and cables are in could shape and not loose. The computers get mad if they don't have the correct voltage and can make everything seem like it is bad.