WarrenJ Posted May 28, 2011 Report Share Posted May 28, 2011 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 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 Link to comment Share on other sites More sharing options...
rockfangd Posted May 28, 2011 Report Share Posted May 28, 2011 cool, just wish I could afford one for my seville, my blow by valve randomly sticks GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
joeb Posted May 28, 2011 Report Share Posted May 28, 2011 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. Link to comment Share on other sites More sharing options...
rockfangd Posted May 28, 2011 Report Share Posted May 28, 2011 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. $8. miss is gone. new delco plugs too. When the dealer did the HG job he said that the valve is sticking, he cleaned it out, it worked for a few weeks and stuck again. I brought it back, they cleaned it again, good for another week, back to the same problem. It doesnt always do it. they told me I need a new intake GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
Ranger Posted May 29, 2011 Report Share Posted May 29, 2011 I'm at 88K Warren. I keep waiting. I know it's in my future. I don't understand why they just didn't bolt the TB to the manifold like the pre-2000's. Link to comment Share on other sites More sharing options...
WarrenJ Posted May 29, 2011 Author Report Share Posted May 29, 2011 I'm at 88K Warren. I keep waiting. I know it's in my future. I don't understand why they just didn't bolt the TB to the manifold like the pre-2000's. Yup. And I can give you 245 reason$ why I think it was a bad idea. I wonder what the other design considerations were. Performance? Reliability (oops!)? Regards, Warren 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 Link to comment Share on other sites More sharing options...
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