Intermittent 0 boost
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Cross-Country
Joined: Jan 2008
Posts: 66
Likes: 1
From: Centennial CO
The 0 boost phenomenon has yet to repeat itself. Lows have been between 10 and 30 degrees. I'm not terribly surprised since there have been plenty of cold days between last winter and this year so far and this season.
That said, when I saw the egt questions the truck was toasty warm on the way home from work already. However at warm idle they are 350 to 375, in stock mode giving a healthy dose of throttle at 2700 rpm egt was approx 850 and in 80e was about 900. Given traffic had to back off quick.
I will check and see what they look like in the morning on when the beast is frosty and post the findings...
I
That said, when I saw the egt questions the truck was toasty warm on the way home from work already. However at warm idle they are 350 to 375, in stock mode giving a healthy dose of throttle at 2700 rpm egt was approx 850 and in 80e was about 900. Given traffic had to back off quick.
I will check and see what they look like in the morning on when the beast is frosty and post the findings...
I
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Cross-Country
Joined: Jan 2008
Posts: 66
Likes: 1
From: Centennial CO
Well it finally happened again after several weeks.
The truck had been parked in a heated garage for 8 hours and was at normal operating temperature based on the dash gauge..Unfortunately I forgot my tablet on the charger this am so I was not able to get a log.
Things were operating normally i was getting boost when suddenly no boost. Applied a generous dose of throttle no boost. Egts jumped drastically to approximately 950(about 200 to 250 above normal) , opened passenger window and throttled again. Again no boost and definitely could hear the closed EBPV egts jumped again.. I got completely off the accelerator and hit it the third time and it finally opened and I got boost back and egts of course went back to normal.
I checked and cleaned ebp sensor and tube last weekend but they looked fine.
It was single digits when this happened tonight but it has been for several days. If this was normal operation it should be happening .much more often given the frigid temperatures lately .
I have had this truck for 14 years and this is the 4th time it has occurred in this way all in the last year..
If it was sticking closed i would think it would be happening more often? Something electrical possibly?
The truck had been parked in a heated garage for 8 hours and was at normal operating temperature based on the dash gauge..Unfortunately I forgot my tablet on the charger this am so I was not able to get a log.
Things were operating normally i was getting boost when suddenly no boost. Applied a generous dose of throttle no boost. Egts jumped drastically to approximately 950(about 200 to 250 above normal) , opened passenger window and throttled again. Again no boost and definitely could hear the closed EBPV egts jumped again.. I got completely off the accelerator and hit it the third time and it finally opened and I got boost back and egts of course went back to normal.
I checked and cleaned ebp sensor and tube last weekend but they looked fine.
It was single digits when this happened tonight but it has been for several days. If this was normal operation it should be happening .much more often given the frigid temperatures lately .
I have had this truck for 14 years and this is the 4th time it has occurred in this way all in the last year..
If it was sticking closed i would think it would be happening more often? Something electrical possibly?
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
I've had this happen to me. When I took my turbo out for an upgrade, I discovered a flaw in the turbine housing casting. The EBPV butterfly valve can catch this flaw and physically jam in place until backpressure is released (you shut the engine off). In my case... it happened after I used engine braking, so this leads me to believe an elevated backpressure on a closed EBPV can jam the butterfly valve closed when that flaw exists. Many turbos have this same flaw - it's a casting for crying out loud. I filed the burr down and it never happened again - and I use my engine braking daily.
Elder User
Joined: Sep 2011
Posts: 979
Likes: 4
From: Vancouver
Intermittent problems can also be related to ....... intermittent electronic/electrical problems, like an oil temp sensor going bad, a corroded harness connection at the PCM or at the oil temp sensor connection. These sensors operate in semi-hostile conditions, like us when being tail-gated by a rice burning Prius. That creates stress to the component, which was probably not quality tested after manufacture. Unfortunately, some Q/A is random or 1/? quantity.
Are you seeing any fluctuation in either air or oil temp numbers(not the dash idiot gauge?
Larry
Are you seeing any fluctuation in either air or oil temp numbers(not the dash idiot gauge?
Larry
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