I did see that but yanked on it a bit and it wasn't loose. You're right, I did notice that but had it been loose, wouldn't it had wiggled off and or at least come off somewhat?
Boost issues (getting only 5-7 psi)
- Thread starter thenewguy
- Start date
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These hoses can split, and why many use pressure - air compressor - to pressurize the lines and spray down the hoses. Oil collects in those hot pipes, it could be just leaking. I have seen people clamp those barb lines with clamps.
Pull the hose off and squeeze the end looking for splits. Just giving it a tug might not show much.
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Pull the hose off and squeeze the end looking for splits. Just giving it a tug might not show much.
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No cracks, it's just wet from oil
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Yep that looks like a good hose. Your IC needs a good draining. You need to keep looking, but on the right track. It's most definitely one of the vacuum hoses to the turbo.
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Sounds like you are "running on the wastegate". Something tripped either overboost or underboost by the pcm and when this happens the pcm will default to running 0% wdc as you described in the datalog. You need to discuss this with Brad.Hey guys, thanks for all the suggestions, I'm fairly new to this stuff so diagnosing on my own is a little tough but was able to get most of the info on what is what. BTW I drive a flex so we don't have the noisemaker for some odd reason. I'll give a more detailed response later tonight but @802SHO , you're right, I saw my log and had almost 100% wastegate up until 35ish miles and then for some odd reason, the rest of the run it showed 0....
I made a quick video of the bay and me checking stuff. If you guy could maybe point out exactly what more I should check and you'll be able to see as well in anything is off in the video, thanks
This happened to me, then my turbos were "running on the wastegate" which was about 6-7 psi boost. It happened to me because my turbos(stage 3's) were taking too long too spool up and Brad had to adjust some parameters so it would not trip underboost mode.
Have you just recently installed larger turbo's?
By the way, wdc as indicated in the datalog more accurately describes percentage of the wastegate boost reference bleed off valve operation, aka our boost solenoid. It makes sense if you watch the following video and realize the electronic boost controller is our boost solenoid and pcm.
This is important to understand the operation of the wastegates on our platform. WDC does not indicate how much the wastegates are opening or closing but how much boost reference is bled off from reaching the wastegate canisters. So if you bleed off 100% of the boost reference to the canisters the wastegates will not open. If you bleed off 0%, the wastegates see full boost reference and open at spring pressure they are set for.
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Thanks for the great explanation. Im on stock turbos. I sent Brad the logs a week ago havent heard back so just wanna make sure im not causing any kinda damage to them with this issue I'm experiencing. After doing research recently im starting to understand the concept of the wgdc percentage. Whats odd is, it initially shows 100 in the earlier part of the run and then 0 once i go into 2nd and remains there the rest of the run. I was able to upload my log here finally https://file.io/W1IbubzzUunW
Another thing I wanted to mention was, we did a few revisions before so when I experienced this issue as soon as he had sent me a revision, i loaded his last revision where everything was working perfectly and experienced the same thing so don't think there's something in the tune itself triggering this but once Brad gets back to me, ill keep you guys posted
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So Brad got back to me, doesn't think wastegates are an issue since I'm underboosting.
His response:
Ok looking at the log you sent I see that it went into underboost mode. Early in the log the car was massively underboosting. So then it goes into underboost once a timer is exceeded. Then after that it will stay there probably until you do a KAM reset. But it will happen again. There has to be a hose popped off or intercooler hose popped off or split hose if you have stock pipes. Or bad BOV diaphraph. Or worst case turbo died.
Or check the vac hoses around the boost solenoid. Actually after watching your vid I think those hoses are ok.
HHmm. might be tricky but it's clearly underboosting from the log. Do you see any oily mess around any of the charge pipes? Sometimes the stock plastic hard pipes split and it's hard to see.
I think there is a large boost leak. I would say unlikely that a turbo is bad but it's possible.
I think if the wastegates were bad it would over boost. Because they would be locked shut. I have seen when the turbos go bad they get play and then rub the housings and then lose ability to move air because the fins are shot. I want to say the problem should be obvious but apparently it's not.
His response:
Ok looking at the log you sent I see that it went into underboost mode. Early in the log the car was massively underboosting. So then it goes into underboost once a timer is exceeded. Then after that it will stay there probably until you do a KAM reset. But it will happen again. There has to be a hose popped off or intercooler hose popped off or split hose if you have stock pipes. Or bad BOV diaphraph. Or worst case turbo died.
Or check the vac hoses around the boost solenoid. Actually after watching your vid I think those hoses are ok.
HHmm. might be tricky but it's clearly underboosting from the log. Do you see any oily mess around any of the charge pipes? Sometimes the stock plastic hard pipes split and it's hard to see.
I think there is a large boost leak. I would say unlikely that a turbo is bad but it's possible.
I think if the wastegates were bad it would over boost. Because they would be locked shut. I have seen when the turbos go bad they get play and then rub the housings and then lose ability to move air because the fins are shot. I want to say the problem should be obvious but apparently it's not.
If you remove the downpipes you can see the turbines, if there is any play they are starting to go, if it's f'd you will know.
Check those plastic charge pipes take them off and inspect.
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Check those plastic charge pipes take them off and inspect.
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Try to help you here so did you follow the solenoid lines to each turbo wastegate and can confirm both are attached, all IC couplers are on and tight?
You’re going to have to dig, remove stuff, look from the top, look from underneath, with the front end of the car on jack stands at their highest setting. There’s no avoiding it otherwise you’ll never find the issue.
You’re going to have to dig, remove stuff, look from the top, look from underneath, with the front end of the car on jack stands at their highest setting. There’s no avoiding it otherwise you’ll never find the issue.
Haven't looks at the turbos themselves and charge pipes at least visually look good, no cracks but I will be taking it to a shop to have everything checked out properly especially stuff I cant see from the bottom.
Yes, followed the solenois lines and theyre all connected. IC couplers look good as well but like I mentioned, ill be taking it to a shop to get a thorough diagnosis and have a smoke test done to see if we can find where the leak is happening.
Update:
So I forgot to update you guys on what we found was the issue. It was basically these arms that come off the wastegate that apparently got disconnected. Added some new cotter pins and connected them and weve got our boost back
So I forgot to update you guys on what we found was the issue. It was basically these arms that come off the wastegate that apparently got disconnected. Added some new cotter pins and connected them and weve got our boost back
Thanks for that update... pos clipsUpdate:
So I forgot to update you guys on what we found was the issue. It was basically these arms that come off the wastegate that apparently got disconnected. Added some new cotter pins and connected them and weve got our boost back
for real
