Still chasing a surge..
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Laughing Gas
Joined: Oct 2012
Posts: 794
Likes: 1
From: Ontario
Still chasing a surge..
Still chasing a surge for some time while cold, mainly. While hot and cruising 65 mph the turbo still surges faintly.. but today was a different story, very fast and high surging from the turbo only, while on overdrive as usual. It calmed down as i dropped the boost a bit but it was quick swings of about 3-5 psi which is quite bad for what it had been doing which was manageable.
Short of taking off the turbo, i took out the VGT solenoid and it had some oil burnt on the end, cleaned that up and pushed the plunger in all the way a few times and it 'seemed' to have helped greatly, until today.
I pulled some other numbers;
KOEO
Map 13.7
EBP 14.1
Baro 28.2
Cold Idle
Map 14.0
EBP 16.5
Baro 28.2
When cold, mainly below 130F the RPM gauge itself will surge or hesitate around 1700-2000 RPM. Any higher or lower it will be smooth'er' i suppose
Short of taking off the turbo, i took out the VGT solenoid and it had some oil burnt on the end, cleaned that up and pushed the plunger in all the way a few times and it 'seemed' to have helped greatly, until today.
I pulled some other numbers;
KOEO
Map 13.7
EBP 14.1
Baro 28.2
Cold Idle
Map 14.0
EBP 16.5
Baro 28.2
When cold, mainly below 130F the RPM gauge itself will surge or hesitate around 1700-2000 RPM. Any higher or lower it will be smooth'er' i suppose
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
BARO is wrong, shouldn't be 28.2, more like 14.1 like EBP at KOEO.
U probably need to take the turbo off, especially since it's surging 2-5 psi. Burnt oil on the exhaust side, bad oil seal... it's time to rebuild it.
Watch for a puff when first starting in the morning. A swirl pattern if you take it off shows an oil leak.
U probably need to take the turbo off, especially since it's surging 2-5 psi. Burnt oil on the exhaust side, bad oil seal... it's time to rebuild it.
Watch for a puff when first starting in the morning. A swirl pattern if you take it off shows an oil leak.
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 794
Likes: 1
From: Ontario
BARO is wrong, shouldn't be 28.2, more like 14.1 like EBP at KOEO.
U probably need to take the turbo off, especially since it's surging 2-5 psi. Burnt oil on the exhaust side, bad oil seal... it's time to rebuild it.
Watch for a puff when first starting in the morning. A swirl pattern if you take it off shows an oil leak.
U probably need to take the turbo off, especially since it's surging 2-5 psi. Burnt oil on the exhaust side, bad oil seal... it's time to rebuild it.
Watch for a puff when first starting in the morning. A swirl pattern if you take it off shows an oil leak.
Burnt oil on the VGT end is bad? I shouldn't say so much as burnt but it was black and gummy but did wipe off without cleaner. Carbon and moisture?
I don't have any blue smoke, regardless of start or take off. Maybe some black smoke at start.
Could baro be reading in a different value? I couldn't find how to tell on scangauge
I will add this, when the EBP is unplugged, the surge is gone. But i hate running like this because of bad mileage due to higher boost while in OD.
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
Plugged in EBP is a surge, unplugged it's gone... new EBP. Cleaned the tube to EBP?
I'm dreading this too... my turbo is starting to act up, little puff when first started.
Your BARO could be programmed wrong, seems double from what it should be. Sea level is 14.7
I'm dreading this too... my turbo is starting to act up, little puff when first started.
Your BARO could be programmed wrong, seems double from what it should be. Sea level is 14.7
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 794
Likes: 1
From: Ontario
I used the BARO xgauge from the xgauge website. Possibility that i may have jumbled a number i suppose. Unless there is a few different gauges for BARO
EDIT: So i updated the scangauge, it must have been in Inches of Mercury, and now changed to psi. My new numbers are pretty spot on, to me anyways.
KOEO
MAP 13.7
BARO 13.7
EBP 13.9
Cold Idle
MAP 14
BARO 13.7
EBP 16.5
I'll check EGR% next i believe, last thing i want to do is tear into the turbo and order a rebuild. Just spent a bunch of money on all new shocks, leveling kit and all 4 links in the front end and a steering stabilizer to fix the wandering on the highway :P
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
BARO at 13.7, you must be above sea level, about 1500ft?
Those numbers look good. EBP at 2500rpm? Should be around 35-40psi.
Turbo rebuild kit about $125. Whats funny is the EBP unplugged and no surge. It's working by the numbers, but something its right by the truck.
MAP, boost and EGR = EBP or something close to that. All those sensors good? Cracks in the MAP hose? MAP should also go up with RPM.
Those numbers look good. EBP at 2500rpm? Should be around 35-40psi.
Turbo rebuild kit about $125. Whats funny is the EBP unplugged and no surge. It's working by the numbers, but something its right by the truck.
MAP, boost and EGR = EBP or something close to that. All those sensors good? Cracks in the MAP hose? MAP should also go up with RPM.
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 794
Likes: 1
From: Ontario
BARO at 13.7, you must be above sea level, about 1500ft?
Those numbers look good. EBP at 2500rpm? Should be around 35-40psi.
Turbo rebuild kit about $125. Whats funny is the EBP unplugged and no surge. It's working by the numbers, but something its right by the truck.
MAP, boost and EGR = EBP or something close to that. All those sensors good? Cracks in the MAP hose? MAP should also go up with RPM.
Those numbers look good. EBP at 2500rpm? Should be around 35-40psi.
Turbo rebuild kit about $125. Whats funny is the EBP unplugged and no surge. It's working by the numbers, but something its right by the truck.
MAP, boost and EGR = EBP or something close to that. All those sensors good? Cracks in the MAP hose? MAP should also go up with RPM.
I will check the map hose but with the numbers being good, not sure it's the right direction.
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Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
Up north in Canada yeah, a bit above sea level. My ebp goes to 37 at 2500ish. Map climbs on throttle too but not as high as EBP if I remember right. I do agree that it's weird.. I'm confused. Something about EBP defaulting to 6.7 has something to do with keeping the surge off... I read somewhere that it could "calm" the VGT solenoid down with the EBP in default but I haven't found any threads of someone with the same thing.
I will check the map hose but with the numbers being good, not sure it's the right direction.
I will check the map hose but with the numbers being good, not sure it's the right direction.
Your right, it's weird. Have you checked the pigtail to the EBP?
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Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 794
Likes: 1
From: Ontario
I inspected the EBP pigtail when I changed the sensor and everything looked good, no chafe or exposed wires but it won't hurt to check again. I'll report back in an hour or two with the numbers and edit this post
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 794
Likes: 1
From: Ontario
I now have these numbers, KOEO, hot idle, 2500 RPM
KOEO
EBP 13.9
MAP 13.7
BARO 13.7
HOT IDLE
EBP 16.5
MAP 14.4
BARO 13.9
VGT 73
EGR 14
2500 RPM
EBP 37
MAP 35
BARO 13.7
VGT 33
EGR 111
The EGR xgauge i used was EGR Valve Position Measured (Low% = Closed)
What i noticed is the EGR will bounce from 10% to 45% at 55MPH consistantly
Cruising at 65 MPH it was jumping from 11% to 112%
Don't know how this is possible to be over 100% open... but this swings are almost consistant with the surge. EGR valve causing this you think?
The majority of the surge happens when cold, i thought the valve didn't operate until 160F?
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 794
Likes: 1
From: Ontario
Not making oil, i check it before any drive usually. Nothing better to do. Just coming up on 8000 km / 5000mile for a change. Still on half hash mark.
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 794
Likes: 1
From: Ontario
No, no code readers. The local shop is much too expensive.. because they're the only ones around for 100 miles.
I have an iphone, i will have to look into a wifi dongle for OBD2 for it.
I will try the EGR unplugged next drive tomorrow morning.
I did try it unplugged before i unplugged the EBP sensor with success, and it didn't change anything. The RPM would still surge, it seems i have two issues going on at once, possibly
I have an iphone, i will have to look into a wifi dongle for OBD2 for it.
I will try the EGR unplugged next drive tomorrow morning.
I did try it unplugged before i unplugged the EBP sensor with success, and it didn't change anything. The RPM would still surge, it seems i have two issues going on at once, possibly