NEED HELP! Codes:P0171, P0174, P0304, Symptoms inside

[etlsport]

the fpr replacement was pretty easy.. im not sure what relay you are talking about... but the black box comes off with two bolts one on the side and one facing the firewall.. there is a fantastic write up on here somewhere, if you cant find it i think i have a pdf version of it on my computer... also try sending a pm to circmand.. i think last i heard he had the paper version of the write up and the modified allen wrench that makes things much easier

[Mrcln1]

I'm going to watch this thread closely cause I just started having the same problems yesterday.....uggg

[taylorRichie]

Thanks ETL... That black box is the relay...

I modified an allen to get to it... but it's still a pain to get to the screw facing the firewall...

I'm still going to be dropping my VX off at the dealership, just to be safe, and possibly save me some money (replacing things that don't need it ) I'll keep everyone posted.

[Mrcln1]

Any update??? I'm having the same issues and no luck???

[WormGod]

FINALLY, ordered a new MAF, FPR, and EGR. Considering an alternator after all that is replaced. I am hopeful these items take care of the 171 and 174 and I will definitely post results.

[WormGod]

Good news. FedEX delivered my goods today so the VX will hopefully getting a mild tear down to get the goods in. FPR, EGR, and MAF all nice and shiny. I will certainly post updates on how well these treat the 171 and 174. Keeping my fingers crossed that the o2 sensors aren't part of problem.

Wish my Green drop in filter came today, but no luck. Such is life.

[WormGod]

Well, it was a "no go". Changed out the FPR, MAF, and EGR, reset the codes last night. Drove it around all day running my errands and catching up with some friends. Ran wonderful. Really felt like she was breathing better. Upon jumping in to leave to come home this evening, she sputtered on startup and stalled a couple times in park. Next thing ya know, "CEL". Same issues as before the parts swap. 171 and 174 remain.

I got her home and let her sit running at idle in the driveway while I tinkered around a bit more. I found that when i wiggled some wiring, the idle RPM would dance around some. I may want to look at some of the rewiring I had to do when I extended lines for the S/C install. Something may have come undone over time or something.

I may just go ahead and add the o2 sensors to my TO DO list next.

I am seriously losing patience (and wallet fat) with VX maintenance.