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Occasional loss of all boost?

13020 Views 17 Replies 11 Participants Last post by  tazzmenn
I've noticed maybe 5 times in the year I've owned my car it will seemingly lose all turbo boost while I'm driving it. Usually happens on hotter days at highway speeds, but it's happened on cooler days as well. My boost gauge on the torque app shows 3psi at full throttle, making it very hard for the car to maintain freeway speeds let alone pass or merge. Stopping the car and turning it off then back on resolves the issue.

What at causes this? Should I be concerned? The car is a 2014 1.4 with a trifecta tune and intake resonator delete.
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I experienced this Monday and today for the first time. It was really hot out on Monday and assumed heatsoak retarded the timing (loss of power). I got the scanner out and on Tuesday I didn't have an issue, at one point the IAT2 temp hit 145F, but I was able to get full boost with a ton of retard of course. Today the no boost thing happened again coming home, really hot out on the way home from work (but only like 110F on the IAT2, A/C off). It would only peak at about 5 psi boost. My scanner was jacked up and commanded boost wasn't working, but didn't see anything crazy in the other sensors I am watching. I'll keep playing with it.
 

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I drove my car last Friday. I was monitoring commanded boost, it was for sure commanding 4psi when I was experiencing low boost. It was all over the place though, sometimes it would let me get full boost in 1st gear, 2nd it would limit boost to 4psi. It wasn't very consistent, it would sometimes command 4 psi with the pedal to floor while cruising, then it jumps to full boost (command and actual) without moving my foot.

I was watching the IAT2 temps, I thought for a second it would only happen at >125F and then I thought it would give me full boost at 124F, but at 124F it still did the low boost, so I am not sure what is forcing this low boost mode. I am pretty sure I was in my unlimited torque command range of the rpm, where a lower maximum torque under torque management could reduce boost so I think this is ruled out. I can try unlimited torque for all rpm ranges to make sure...
 

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The Cruze is a torque managed system. Boost will only be requested by the ECU if needed to provide the requested torque. Can you monitor requested torque along with boost?
Yes I will monitor this.

This was happening on my journey home from work, I was running the A/C which is probably why it gets so hot because part of my commute goes through town so airflow is reduced and once this car heat soaks there is no reversing it. I have been purposefully not running the A/C on my commutes home, in 90+F weather, I have not been having reduced boost issues over several commutes lately.

I think I will now run the A/C again tonight on the commute home and see if I get reduced boost after the stop/go session where I note this issue; my tuner is shared with my other car, so I don't have it hooked up right now though. The theory regarding running the A/C is to accelerate the heat soak, as the A/C condenser is inputting a ton of heat into the engine bay.
 

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Yes I will monitor this.

This was happening on my journey home from work, I was running the A/C which is probably why it gets so hot because part of my commute goes through town so airflow is reduced and once this car heat soaks there is no reversing it. I have been purposefully not running the A/C on my commutes home, in 90+F weather, I have not been having reduced boost issues over several commutes lately.

I think I will now run the A/C again tonight on the commute home and see if I get reduced boost after the stop/go session where I note this issue; my tuner is shared with my other car, so I don't have it hooked up right now though. The theory regarding running the A/C is to accelerate the heat soak, as the A/C condenser is inputting a ton of heat into the engine bay.
Just follow up here, I went 2 super hot commutes home with A/C blasting and did not get a low boost condition. So my theory about extra heat soak is not looking good.
 

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I finally got my first CEL!!! It is the code of turbo death: P0299

The issue is still intermittent, I am still able to get full boost 99% of the time I am driving.

My plan is to pull the down pipe and inspect for the crack at the wastegate port. If it's cracked than most likely I'll get it warrantied. If it's not cracked, I'm going to crack a beer and then wrap my down pipe.
 
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