Thread: 02 gtp sluggish at low rpm's

What's the numbers for the codes?

It'll say bank one no matter what we only have 1 upstream o2 and 1 ds so they are both bank 1. If you can find out the code numbers it'll help out.

They didn't give you a printout of the codes? Hmm

The p0171 is most likely a vacuum leak. The p0137 could be a bad o2

How many miles are on the car?

A vacuum leak will definately cause this. I'm stumped on the knock sensor code though. Maybe its just S**t to bed.

Now that I think about it, you said it's been doing this sinse you've had the car. Check to see that someone hasn't unplugged the knock sensor. Bank 2 is on the right side of the motor near the firewall and up under the rear manifold. It's just one wire with a connector.

Originally Posted by Wkg318GTP

So have u ever heard of one of those causing a car to hesitate at low rpm's? I also noticed today that it only hesitates in 1st and 2nd gear at low rpm's. It does fine in 3rd and 4th at low rpm's.

vacuum leak will definitely cause hesitation.

Knock sensor, bank 2 I believe.

p0171 is the egr tube that goes into the manifold, it has a crack in it, they all do,

That knock sensor wire terminates from a bundle that wraps down the back of the motor near the alternator. I think the oil pressure switch wire is very near to it. Follow the oil sensor wire to the bundle and if you don't see a loose wire with a connector then I don't know what to tell you. It might be tucked in behind the rack & pinion.

It looks like someone's been muckin with your motor.

I don't know if the lack of a knock sensor signal forces the PCM to run in limp mode or not. Even so, in limp mode you wouldn't see the hesitation you're getting. Keep looking for the wire and the possible vacuum leak and go from there.

Maybe a tuner will chime in here with an opinion on the knock sensor.