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Discussion Starter #1
Ok I replaced both abv solenoids replaced all vacuum lines and check valves when I replaced the knock sensor all new coil packs boots and plugs. Once the car gets warm it wont boost at all after 2000rpm and will bearly accelerate. Now at about 1/4 throttle it will increase speed just a little bit. When the car is cold car runs great hits boost with no hesitation what so ever. So not sure what else to look for any ideas would be great.
 

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Hi Taylor,

I've struggled with similar gremlins in the past, and have thus far not kept up with the consecutive problems. Since you just did the vacuum lines, it's most likely that the problem lies there. I know how much you don't want to tear into that rats nest again, but there is probably a misrouted, leaky, or pinched line somewhere. If nothing raises any red flags there, check for leaks in the intake and while youre at it, you might want to clean the MAF with the special MAF cleaner, don't use anything else. With a 1504 its nearly always a vacuum leak, I'm sure you tested the pressure because you recommended that to me a few weeks ago, but man this vacuum system is a headache. I feel for ya, because my miller is still not happy with me, but one day, when the engine is happy, we will be too.
 

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Discussion Starter #4
Thanks for the information guys. I replaced all vacuum lines with all new lines I also just recently found that a check valve had broken in half I replaced that as well and I also found that the big hose with the built in check valve that comes off the side of the throttle body to the pump hard line that the breaks booster line ties into had a hole in it from a metal hose clamp and along with the other big hose next to it. Even after I replaced that they stupid tcs lights come on and it goes into safe mode. But it gets worse with temperature. The hoter it gets the worse it is. If it's cold runs great. The vaccum diagram I've been using is the color one off of Google. But it does not say for what year miller cycle engine.
 

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Discussion Starter #5
I guess this weekend I'll start putting zipties on all of the vac lines to ensure a proper seal. Really wish this engine didn't produce so much heat.
 
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