Looks like you hit the correct button........
Yes.ok well got in and did the plugs and cleaned the throtle plate of and it still ran the same way so i did not want to be spending hours and hours and replacing part after part untill i got it right
so i took it to the shop and they ran there tests and said the Pressure Reliffe valve is bad and leaking that is why it has what is feeling like a back fire
Does this make sence to anyone thats what they said the reason for it pulling up codes is
so i guess im asking is this sound right to anyone els or am i getting screwed ?
are you saying that this is not a reason for the code to come up and for it to run Lean ?Yes.
In the end of the intake manifold behind the power steering pump is a thingy called an "overpressure relief". It is a spring-loaded poppet or swing valve (depending on model and year) designed to vent off the intake manifold in case of a backfire. Sometimes they either hang partly open or develop a slight leak which will set vacuum and mixture (O2 sensor) codes. The only real fix is to remove the intake manifold and clean everything. See the hand in the second drawing?? That's where the relief is.
If you don't feel comfortable tearing into the intake system, this fix will cost a couple of hours labor and gaskets.......$175 - $350 depending on labor rates.
EDIT.......If you open it up, you might as well replace the connector plenum - they will eventually crack at the bottom of the single bellows. $42, dealer only, p/n 12555840 (on the yellow tag).
Torque the intake manifold bolts to 8 ft/lb precisely. Very critical as the manifold is a resin/fiberglass composite, and you'll crack a bolt hole if you're not careful.
ah ok thank youYes, a leaking pressure relief valve will set various codes and NO, for the quoted price you're not getting screwed.
With lean codes Current I would not drive the car at highway speed for any length of time. One or more burned exhaust valves is a distinct possibility under lean conditions.
P0171 and P0174 refer directly to O2 sensor output which is sensing a lean mixture or long term fuel trim. The O2 sensors control the mixture, along with about 6 other sensors..........
it stalled out a few times on my way home from the store today but only when i first went ot start it i put my foot on the gas for a little bit or i would put it in drive and rive and then when iw ould stop after its be jewcing hte batter it would stay fineMost of the UXXXX codes are serial data and voltage hiccups. Unless they stay Current and throw a different code, too, forget them. You'll also see them when you disconnect the battery for cable cleaning or replacement, or in really cold weather with a hard start as the battery strains to roll the engine over.
i didnt take it to a gm dealer but i did take it to a Professional shop that only has ASE certified MechanicsIF the intake manifold relief valve is leaking so badly as to cause a low speed stall then you would be well advised to take the car to a qualified GM dealer for accurate diagnosis. It will cost you big bucks, but if you haven't done the basic checks and corrected problems as you got further into your endless stream of problems with this car, then it's time for heavy duty professional help.
