Getting the underboost shake again
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 1,202
Likes: 1
From: Frederick MD
We'll did the re Learn. So I've cleaned the egr, ebp map hose maf and iat2. Turbo has only 8k on it. And all new riff raff boots. It's still has a shutter and still no codes. I'm not sure where to go now.
Postmaster
Joined: Jan 2005
Posts: 4,424
Likes: 12
From: BC Canada
Unplug the EGR, and try test running it to see if you can get it to act up. Try hard, try and repeat all the places where the circumstances showed the issue before. This is what Bismic suggested to me and it worked like a charm. I tried to get it to chug, smoke and repeat, it was instant solution. Once I got a new EGR I re did the relearn and no more problem.
Postmaster
Joined: Jan 2005
Posts: 4,424
Likes: 12
From: BC Canada
Mine did the Sam, any time it's under 10 psi and you asked for more it would cause the issue. Unplug the EGR, it's probably not responding and causing the slow increase in boost on acceleration.
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 1,202
Likes: 1
From: Frederick MD
Yeah I did the other day but that was before I did all the clean ups. So I guess I need to do it again. Or just put a new egr in. I'm trying everything before I have to send it to a shop. I appreciate you walking me through all this.
Senior User
Joined: Jul 2011
Posts: 226
Likes: 0
From: Grays Harbor ,WA
I just started getting this.....I think. Its like a gasser misfiring.. It seems to happen with engine under a light load , like a small hill. At first I wasn't sure it even was the engine. I thought it was bumps in the road. Now im pretty sure it is the engine, but it like nothing Ive ever experienced with a diesel.. Like a gasser misfiring is the best way to describe it....
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 1,202
Likes: 1
From: Frederick MD
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Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 1,202
Likes: 1
From: Frederick MD
Update we'll thinking it was the egr I ordered a new one and since then have had my egr unplugged we'll the shake showed back up today. Now I'm at a total loss at what this is.
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Do you have access to a scanner that you can run a "cylinder contribution test" while this occurs? I think you have an injector dropping out. I just found one on my truck yesterday. My engine runs strong except at 1100 rpm, cylinder 3 is -20%, slacking compared to the others.
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
I have the same scenario. No, it's not constant. No smoke on mine once it's warmed up. Stiction is a funny thing.
Thread Starter
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Laughing Gas
Joined: Oct 2012
Posts: 1,202
Likes: 1
From: Frederick MD
Did you try any eliminator and see if it solved it for a little? Also I am wondering if I should just send this egr back now or just go ahead and replace it
Only reason I ask is I have a bottle of archoil 9100 and I won't be able to tear into the truck for acouple weeks
Only reason I ask is I have a bottle of archoil 9100 and I won't be able to tear into the truck for acouple weeks