6.0 boost problems
Logistics Pro
Joined: Dec 2004
Posts: 4,138
Likes: 7
From: South Weber, Utah
Is the MAP hose attached to the passenger side of the intake manifold? Is the VGT valve plugged in? A really bad exhaust or CAC leak would do it.
Fleet Owner
Joined: Mar 2003
Posts: 24,724
Likes: 74
From: Blue Hill Township
I was going to suggest the same thing. An unplugged MAP line would cause exactly that.
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Junior User
Joined: Feb 2014
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Wow you guys were dead on... Map hose had got ripped pretty bad from installing turbo so many times... Fixed it and now turbo spools awsome and truck builds normal boost again... No problems there... The hesitation is still there tho... With key on engine off my ebp is 50s and while the truck is accelerating it changes about every fourth second from a value in the 70-80 range to a value in the 110-120 range and every time it bounces back on fourth you can hear the exhaust changing and cause the truck to kinda studder a little bit every time it does that... I know the ebp is high but I've cleaned the tube and have had 2 different brand new sensors with no change what so ever... Pipe is clean... When I unplug the ebp sensor the truck does not stutter at all, and the exhaust doesn't change it sounds completely normal while accelerating... The only problem is the truck builds boost very very slowly with it unplugged... On a side note i am very happy that my turbo rebuild was successful. Thanks for the help guys...
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Junior User
Joined: Feb 2014
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Let me add that when the ebp is plugged in and the truck readings are going back and forth, the map, baro, and boost all remain exactly where they should be. Boost isn't fluctuating at all. It's completely normal. I do however here when the truck is hesitating a sound of like a blow off valve cycling with the exhaust and with the ebp readings very quickly. It sounds like woosh, woosh, woosh,(not to be confused with the turbo fart sound) and the exhaust is cycling from that good sound of 5" turbo back exhaust while accelerating, to a much lower exhaust sound... All at the same time as the woosh sound I'm hearing from the engine and at the same time I see the readings jump from in the ballpark of 80 to 110 then 80 to 110 again really quickly
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Junior User
Joined: Feb 2014
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ok so after more research i think the higher than normal ebp readings are due to my sct x4 monitor... i have no idea what they were before so i cannot verify but after doing much more research i have found a lot more people with an sct monitor recording ebp exactly in par with mine.... my problem is that while accelerating it is jumping back and forth from 80 to 110 very quickly which is causing my exhaust to sound funny and I am hearing a sort of blow of sound coming from the engine at the same time... with the ebp it doesn't do this and runs normal except it builds boost very slowly... what would cause my ebp sensor to change like this? i assume since my tuner is causing higher readings that it would actually be jumping from around 20-30psi back and forth about once or twice every second... i may have to upload a video for you guys to see exactly what I'm saying.
Fleet Owner
Joined: Mar 2003
Posts: 24,724
Likes: 74
From: Blue Hill Township
Are you sure that isn't kpa?
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Fleet Owner
Joined: Mar 2003
Posts: 24,724
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From: Blue Hill Township
Re-reading your post, it sounds like you have an up pipe leak. Does your tune smoke if you goose it? If so, have somebody goose the throttle and watch for smoke by the turbo which would be an up pipe leak
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Junior User
Joined: Feb 2014
Posts: 64
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Are you saying leaking from around the clamp to turbo? Or somewhere else? I will check it out. I just assumed a leak would cause lower ebp... And wondered why a leak would cause sporatic ebp?
Fleet Owner
Joined: Mar 2003
Posts: 24,724
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From: Blue Hill Township
Check at the inlet to the turbo.
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Junior User
Joined: Feb 2014
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Thanks will check tomorrow.
Logistics Pro
Joined: Dec 2004
Posts: 4,138
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From: South Weber, Utah
Something is off for sure as the 48 what ever its reading in doesn't match up with PSI, in hg or KPA. with KOEO. KOEO they should be, PSI= 14.3, in/hg = 29.11 and KPA= 98.59. The 14.3 was what he reported his BARO to be.
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Junior User
Joined: Feb 2014
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I decided to drive the truck today with the ebp unplugged... Ebp stayed at 21 or 24 (can't remember) the entire time. Exhaust sounded normal, just built boost slow... And it also blew a little cloud of white smoke at WOT once it was warm... I'm pretty sure it wouldn't be HG because I have arp head studs and new oem gaskets as off about 6 months ago, couldn't be a leak at egr cause mine is deleted, and I pray it's not the oil seal in my turbo becUse I just rebuilt it and I'm tired of taking that thing in and out. Any ideas? Maybe the smoke is related to the ebp problem? When someone else drives with the ebp unplugged do they report any smoke?
Logistics Pro
Joined: Dec 2004
Posts: 4,138
Likes: 7
From: South Weber, Utah
I decided to drive the truck today with the ebp unplugged... Ebp stayed at 21 or 24 (can't remember) the entire time. Exhaust sounded normal, just built boost slow... And it also blew a little cloud of white smoke at WOT once it was warm... I'm pretty sure it wouldn't be HG because I have arp head studs and new oem gaskets as off about 6 months ago, couldn't be a leak at egr cause mine is deleted, and I pray it's not the oil seal in my turbo becUse I just rebuilt it and I'm tired of taking that thing in and out. Any ideas? Maybe the smoke is related to the ebp problem? When someone else drives with the ebp unplugged do they report any smoke?