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Codes P0171 & P0174


WarrenJ

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I'm not here looking for a solution; I've already got that. I just thought I'd relate my experience as sort of an FYI.

At the mention of codes P0171 and P0174, no doubt many here would be quick to tell me I should check for cracks in the plenum duct that couples the throttle body to the intake manifold. And they'd be right. Been there (yesterday) did that.

But here's the heads-up: for a few months prior to the codes doing the up-popped-the-rabbit trick, my engine idled ever so slightly rough. The major emphasis here is on "slightly" with a minor on "ever so." I just didn't put any effort into solving the idle "problem" as I thought it would be just about impossible to locate and fix. Nevertheless, if you're as anal as I am, you know just how that can bug a person.

So worry about your plugs, your wires, sensors etc., but don't overlook the possibility of a very minor vacuum leak if you're experiencing a (very) slightly (ever-so) rough idle with no codes showing. And, if you're at 90K+ miles as I am, keep that plenum in mind.

Now the steed idles like silk once again and I have to check the tach while stopped at every traffic light just to make sure Mr. Northstar is still going about his business.

Oh, and no smurfin' codes! Ahhh . . . .

Regards,

Warren

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There is no means of avoiding the final collapse of a boom brought about by credit expansion. The alternative is only whether the crisis should come sooner as the result of a voluntary abandonment of further credit expansion, or later as a final and total catastrophe of the currency system involved. - Ludwig von Mises

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cool, just wish I could afford one for my seville, my blow by valve randomly sticks

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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the blow off valve sticks? or leaks? it should never really come off the seat unless your motor sneezes? i also get an occasional whistle and have gotten a p0174 rarely. have not seen it in several months now. i got a new set of delco wires to chase a miss. 6 months later it came back. got replacement set. several yrs later miss came back. lost receipt for wires. so i got a used set of wires from a junkyard. $8. miss is gone. new delco plugs too.

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the blow off valve sticks? or leaks? it should never really come off the seat unless your motor sneezes? i also get an occasional whistle and have gotten a p0174 rarely. have not seen it in several months now. i got a new set of delco wires to chase a miss. 6 months later it came back. got replacement set. several yrs later miss came back. lost receipt for wires. so i got a used set of wires from a junkyard. $8. miss is gone. new delco plugs too.

When the dealer did the HG job he said that the valve is sticking, he cleaned it out, it worked for a few weeks and stuck again. I brought it back, they cleaned it again, good for another week, back to the same problem. It doesnt always do it. they told me I need a new intake

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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I'm at 88K Warren. I keep waiting. I know it's in my future. I don't understand why they just didn't bolt the TB to the manifold like the pre-2000's.

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I'm at 88K Warren. I keep waiting. I know it's in my future. I don't understand why they just didn't bolt the TB to the manifold like the pre-2000's.

Yup. And I can give you 245 reason$ why I think it was a bad idea. :unsure:

I wonder what the other design considerations were. Performance? Reliability (oops!)?

Regards,

Warren

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There is no means of avoiding the final collapse of a boom brought about by credit expansion. The alternative is only whether the crisis should come sooner as the result of a voluntary abandonment of further credit expansion, or later as a final and total catastrophe of the currency system involved. - Ludwig von Mises

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