No boost, engine stumbles-cuts out
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Junior User
Joined: Apr 2003
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No boost, engine stumbles-cuts out
Hi There. I've run into a problem with no boost in my 2005 F350.
I just completed A new EGR delete new, stand pipes STC, etc. and once all together my truck was running at what seams half power with only 4 lbs boost at best only when I got the RPM's over 3000. I could hear the turbo spooling up but no real boost. As I'm pulling and reconnecting some sensors to make sure they are tight, now the truck doesn't really drive at all. Although I can hear the turbo a bit better now at the exhaust pipe, It now revs up to 2000 RMS and stumbles dead, then continues to rev back up to 2000 then stumble. even when I put my foot into it and now no boost on the instrument gauge what so ever. I looked through all tubes connecting to the turbo and haven't found a leak. I originally thought it might be the turbo solenoid not adjusting the veins in the turbo but now with the stumbling/cutting out, I think it might be something more. Any thoughts?
I just completed A new EGR delete new, stand pipes STC, etc. and once all together my truck was running at what seams half power with only 4 lbs boost at best only when I got the RPM's over 3000. I could hear the turbo spooling up but no real boost. As I'm pulling and reconnecting some sensors to make sure they are tight, now the truck doesn't really drive at all. Although I can hear the turbo a bit better now at the exhaust pipe, It now revs up to 2000 RMS and stumbles dead, then continues to rev back up to 2000 then stumble. even when I put my foot into it and now no boost on the instrument gauge what so ever. I looked through all tubes connecting to the turbo and haven't found a leak. I originally thought it might be the turbo solenoid not adjusting the veins in the turbo but now with the stumbling/cutting out, I think it might be something more. Any thoughts?
Lead Driver
Joined: Sep 2012
Posts: 7,830
Likes: 96
From: Manteca,Ca
the ICP is on the passenger side rocker cover the IPR will be under the turbo, the wire wiggle test to the ICP will tell you if the connection is bad, if theres oil comeing out the wire side its the senser, do you have any scan gauges to read live data like a scan gauge II with x gauge this will help in locating the problem,Did you install any tune .there are alot of great guys here that will chime in on the turbo and stumble
Hotshot
Joined: Apr 2010
Posts: 19,061
Likes: 238
From: Saratoga Springs,UT
Hi There. I've run into a problem with no boost in my 2005 F350.
I just completed A new EGR delete new, stand pipes STC, etc. and once all together my truck was running at what seams half power with only 4 lbs boost at best only when I got the RPM's over 3000. I could hear the turbo spooling up but no real boost. As I'm pulling and reconnecting some sensors to make sure they are tight, now the truck doesn't really drive at all. Although I can hear the turbo a bit better now at the exhaust pipe, It now revs up to 2000 RMS and stumbles dead, then continues to rev back up to 2000 then stumble. even when I put my foot into it and now no boost on the instrument gauge what so ever. I looked through all tubes connecting to the turbo and haven't found a leak. I originally thought it might be the turbo solenoid not adjusting the veins in the turbo but now with the stumbling/cutting out, I think it might be something more. Any thoughts?
I just completed A new EGR delete new, stand pipes STC, etc. and once all together my truck was running at what seams half power with only 4 lbs boost at best only when I got the RPM's over 3000. I could hear the turbo spooling up but no real boost. As I'm pulling and reconnecting some sensors to make sure they are tight, now the truck doesn't really drive at all. Although I can hear the turbo a bit better now at the exhaust pipe, It now revs up to 2000 RMS and stumbles dead, then continues to rev back up to 2000 then stumble. even when I put my foot into it and now no boost on the instrument gauge what so ever. I looked through all tubes connecting to the turbo and haven't found a leak. I originally thought it might be the turbo solenoid not adjusting the veins in the turbo but now with the stumbling/cutting out, I think it might be something more. Any thoughts?
My Money is on the Ypipe or Uppipe leak to turbo since you have very little Boost PSI
Odds are High you have a Exhaust leak at the Ypipe to Turbo Connect
Also could be a CAC System Leak so check the CAC Boots and clamps
Start the truck and Hurry while its cold its going to heat up fast and feel the joints with your hand if you can feel an exhaust leak at any exhaust joints you just found your problem the ypipe has an inner flange that usually hangs up
If it is a exhaust leak you basicaly need to undo the turbo bolts and connections and Start over
Smear some antiseize on the V-Band clamps as alittle slip-n-slide will go along way here.
What type egr deleate did you get???Did you change the Upipe??
If so^^did you make shure to get the Metal gasket inbetween the Uppipe & Ypipe joint??
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Junior User
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I checked all the connections for the turbo upon initial start up when the engine is cold and found no leaks. Re tightened up all the connections to the inter cooler boots and checked with no leaks. I did put a new up pipe with my delete and it's tough to reach that connection from the top so I tied a piece of string to a stick and shoved it up from the bottom to see if I could see if a leak would blow it around and nothing. so as far as I can see there are no leaks. I originally thought it was a leak as well as it would at least give me at 4 lbs of boost but now it gives me nothing and cuts out when it revs up.
How would I go about testing the IPR fitting while it's on the truck if that's another cause. If I do have to pull the turbo again, which I'm think is inevitable at this point. would it be worth just replacing the IPR fitting once in there as it is really a PITA to get at. Did the wiggle test on the ICP an no change either.
Thanks, Todd
How would I go about testing the IPR fitting while it's on the truck if that's another cause. If I do have to pull the turbo again, which I'm think is inevitable at this point. would it be worth just replacing the IPR fitting once in there as it is really a PITA to get at. Did the wiggle test on the ICP an no change either.
Thanks, Todd
Hotshot
Joined: Apr 2010
Posts: 19,061
Likes: 238
From: Saratoga Springs,UT
OK so Still have to keep tracking down the cause of No Boost
Post these sensor values at KOEO (Key On Engine Off)
BARO
MAP
EBP
Your going to need a Gauge
A ScangaugeII from Autozone for 160.00 will do what you need
You could try to clean Map sensor and Hose that feeds it off the intake manafold Make SHURE to get the Nipple Clean coming off the intake manafold thats where they like to plugup
Post these sensor values at KOEO (Key On Engine Off)
BARO
MAP
EBP
Your going to need a Gauge
A ScangaugeII from Autozone for 160.00 will do what you need
You could try to clean Map sensor and Hose that feeds it off the intake manafold Make SHURE to get the Nipple Clean coming off the intake manafold thats where they like to plugup
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Hotshot
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From: Saratoga Springs,UT
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Thread Starter
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Junior User
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I did do the oil cooler as well. No internal breakdown of the EGR cooler of what little I could see of it anyway. The oil cooler was pretty clogged though. I'll look into the map sensor. That's the square hard plastic sensor on just aft of the air cleaner on the tube going to the turbo right?
Thanks for your help on this guys. I'll keep plugging away.
Thanks for your help on this guys. I'll keep plugging away.
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Junior User
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Well, I can't thank you guys enough. Just got home and thought I'd start with the MAP senor. got up on my knees on top of the motor tugging at wires and out the corner of my eye I saw A vacuum type hose not hooked up.. I thought Yes! here it is. That was half of the battle. Now I just needed to find out where it went. Another 20 minutes believe it or not I found it on the manifold. Plugged it in, fired the truck and it runs like a top Everything is working great. I wish I could buy you guys a beer . If it wasn't for you guys I would be either up to my elbows in grease still a couple months from now or thousands in debt to take it to the shop.
thanks so much
thanks so much
Hotshot
Joined: Apr 2010
Posts: 19,061
Likes: 238
From: Saratoga Springs,UT
I did do the oil cooler as well. No internal breakdown of the EGR cooler of what little I could see of it anyway. The oil cooler was pretty clogged though. I'll look into the map sensor. That's the square hard plastic sensor on just aft of the air cleaner on the tube going to the turbo right?
Thanks for your help on this guys. I'll keep plugging away.
Thanks for your help on this guys. I'll keep plugging away.
NO thats the MAF sensor
the MAP sensor is mounted to passengerside firewall and has a rubber tube going to it from the Intake manafold
Kinda hard to see map in this pic I didnt have a Better one Look right at the Engine oil filler cap
Now look past the oil filler cap at the A/C Box there is a Bracket holding a sensor with rubber tube thats the one MAP SENSOR
Lead Driver
Joined: Sep 2012
Posts: 7,830
Likes: 96
From: Manteca,Ca
I still dont know what that vaccume 1/8'' line does but If it fixed your issuie fantastico,I do know that coolent will leak at the screw on the top so keep an eye on that,Glad to hear you goter running
Lead Driver
Joined: Mar 2010
Posts: 5,505
Likes: 256
From: Woodbridge, Ontario, CA
Are you talking about the heater control valve , by any chance? If so, the purpose of that valve is to block off flow to the heater core when the A/C is selected, to maxiumize cooling efficiency.