Join Date: Dec 2011
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Still loosing boost, likley out the waste gate.
Well shoot. I sure thought I had the problem cured. I disconnected the vacuum line to the actuator for the waste gate, drive my truck all over the place and had no problems with it. Then on my way home from a meeting in town , I was no more than 5 miles from my house when it started it again. So something other than the actuator is opening the waste gate.
One thing that I have noticed, is that it does it more when the outside temperature is cold, like below freezing. It still does it some when warm outside, but not as much and it does not COMPLETELY dump all boost like it does when it is cold outside. Maybe something mediated with colder weather. I don't remember it ever doing this during the summer, but I had it do it just a bit last winter, though it was never dumping enough to notice more than just a hiss from the waste gate and no noticeable power loss as it would stop soon as I gave it more throttle.
Another thing, I am not sure my truck has a thermostat in it. I got this truck used with 76K on it. The temp gauge almost never gets more than about 1/6 of the way off the cold mark, even in the summer at 100 plus degrees outside. I rarely see it near the half way mark unless I am hauling a heavy load (like 15K or more) up a LONG hill. Everyone I know with the same basic truck as mine, the temp gauge reads about half way all the time. Any thoughts on on if there is a sensor that might be saying the truck is cold and opening the waste gate. Is there any way for it to open the waste gate with the actuator line disconnected??? What holds it closed, a spring?