Join Date: Aug 2009
Feedback Score: 0 reviews
Intermittent Boost Cut-out
I hate to be “that guy” whose first post is a problem, but...
No other mods.
Symptoms: Intermittent boost cut-out. When it happens, it’s “cyclical”...as in, the cut out feels like someone gently tapping the brakes about every .5 second. Boost meter on the Edge shows boost drops 3-4 lbs with each “tap”. If I ease off the gas, the symptom subsides. It’s accompanied by an associated short “whoosh” or “puffing” sound from under the hood with each “tap”.
Conditions: Most often when encountering a hill when boost starts to increase. Usually associated with a downshift of the automatic trans. Seems to be more prevalent in warmer temps.
History: First onset was actually a few years ago, but shop couldn’t duplicate it or track down the problem. Originally, only happened maybe once a month, but could count on it happening on the same hill on the way home if I got it to downshift. Just lately, has become more frequent, to the point that it happens occasionally under normal traffic acceleration. Had parked it until I had some time to troubleshoot. Took it out yesterday and could not duplicate. Hard acceleration up to 22 lbs on the Edge with no problems.
Other: Edge shows a P132b code, which doesn’t necessarily tell me anything more specific than I’ve got a boost problem. (Please educate me if I’m wrong!). Checked all of the rubber “couplers” I could get to and didn’t find any obvious leaks. (Don’t think it would be a “leak” anyway, due to the intermittent nature of the symptoms, correct?)
Possibilities? Solenoid? Wastegate? Anything else? Stuck vane? (Don’t even know what that means, but I’ve seen it mentioned in other boost problem threads!)
I’m pretty well versed wrenching on my own stuff, but admittedly not smart on these big turbo diesels. Any and all direction this diesel brain trust could possibly provide would be greatly appreciated! Will do whatever I can to investigate any suggestions to the extent my tools and abilities allow!
Thanks much, in advance, for your help.