开云体育

Hi everyone,

My 2003 Eurovan has an intermittent p0171 that I can't seem to find the source of the vacuum leak. I first got the code about 5 or 6 years ago, and when I went hunting for a vacuum leak, the brake booster was cracked.? I taped it at first, then replaced it and things seemed better.? Still 2-3 times a year, typically after being on the freeway for a longer period and exiting, the code will come back.? I have tried spraying carb cleaner on all the lines I can find, and don't get any difference.? When I checked the short term fuel trim with an OBD tool it came back at .78% and in reading this thread () it should be something more like 20% when there's a leak.

I'm not really sure what else to do so could really benefit from some troubleshooting advice and things to check.? Any typical leaking spots?? Ways to check other vacuum lines?? At 21 years old, I'm sure there's rubber decaying but damned if I can't find where the heck the trouble is.?

I also have not touched the MAF at this point, assuming that it is happening when I come back down to idle when the throttle body isn't open and air is leaking in.? But maybe that's the wrong conclusion.? Appreciate any advice and troubleshooting steps.??

Thanks!

Menko