Low boost/high egts..
Thread Starter
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Tuned
Joined: Oct 2020
Posts: 467
Likes: 158
Low boost/high egts..
Hey everyone. I was wondering if you could help me get pointed in the right direction? I just had a nice pair of Isspro gauges installed and now I’m realizing my truck has issues. I’m seeing low boost—if I mash on it it will boost to 9psi but cruising I’m lucky to hit 6psi pulling my relatively light camp trailer (4K lbs or so loaded). My egts will quickly rise to 1250 or past if I let it but I haven’t gone past. Prior to the gauges I’m sure I’ve far exceeded 1250 which as you could imagine has me worried...
I can’t hear my waste gate at all. My friend has a 7.3 and his waste gate is very noticeable. Could mine just not be holding? How would I know for sure? Intercooler boots look to be in good shape although they are stock.
Truck is an E99 with a manual transmission and is all stock aside from a 6637 filter and a 4” turbo back with no cat or muffler.
I have another trip coming up and would like to get it sorted before I hit the road. Any advice or help would be appreciated! Let me know if you need more info. Thanks,
Andrew
I can’t hear my waste gate at all. My friend has a 7.3 and his waste gate is very noticeable. Could mine just not be holding? How would I know for sure? Intercooler boots look to be in good shape although they are stock.
Truck is an E99 with a manual transmission and is all stock aside from a 6637 filter and a 4” turbo back with no cat or muffler.
I have another trip coming up and would like to get it sorted before I hit the road. Any advice or help would be appreciated! Let me know if you need more info. Thanks,
Andrew
FTE Chapter Leader
Joined: May 2020
Posts: 2,933
Likes: 2,192
From: Langley B.C. Canada
Two things to look at.
1- check for exhaust leaks, head to manifolds, manifolds to up pipes, up pipes to collector/ babies butt. Drive pressure leaks will rob boost pressure and raise egt.
2- do a boost leak check. Pressurize system post ccv, 15psi and go to town with soapy water in a spray bottle. Address all bubbly locations.
1- check for exhaust leaks, head to manifolds, manifolds to up pipes, up pipes to collector/ babies butt. Drive pressure leaks will rob boost pressure and raise egt.
2- do a boost leak check. Pressurize system post ccv, 15psi and go to town with soapy water in a spray bottle. Address all bubbly locations.
Lead Driver
Joined: Jul 2017
Posts: 6,855
Likes: 2,332
From: WV
Welcome to the forum!
F350towing already made my recommendations.
The wastegate noise you’re referring too is more likely “turbo bark” when letting off with higher boost conditions.
The wastegate deserves being looked into but I don’t think the noise you’re hearing is the gate opening.
Are you stock or running tunes? Sorry, signatures don’t show up on mobile devices.
F350towing already made my recommendations.
The wastegate noise you’re referring too is more likely “turbo bark” when letting off with higher boost conditions.
The wastegate deserves being looked into but I don’t think the noise you’re hearing is the gate opening.
Are you stock or running tunes? Sorry, signatures don’t show up on mobile devices.
Thread Starter
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Tuned
Joined: Oct 2020
Posts: 467
Likes: 158
I don’t see any soot on the firewall and when it starts cold I don’t see any smoke escaping from anywhere except the tail pipe so I ‘think’ I’m good to go in that regard.
To pressurize the system I just put a 3” pipe cap with a schrader valve in where the air filter attaches and pressurize it to about 15psi correct? I noticed RiffRaff has all the boots for around $150 I might just replace them to be safe..
Thanks for the reply and help
To pressurize the system I just put a 3” pipe cap with a schrader valve in where the air filter attaches and pressurize it to about 15psi correct? I noticed RiffRaff has all the boots for around $150 I might just replace them to be safe..
Thanks for the reply and help
Thread Starter
|
Tuned
Joined: Oct 2020
Posts: 467
Likes: 158
Welcome to the forum!
F350towing already made my recommendations.
The wastegate noise you’re referring too is more likely “turbo bark” when letting off with higher boost conditions.
The wastegate deserves being looked into but I don’t think the noise you’re hearing is the gate opening.
Are you stock or running tunes? Sorry, signatures don’t show up on mobile devices.
F350towing already made my recommendations.
The wastegate noise you’re referring too is more likely “turbo bark” when letting off with higher boost conditions.
The wastegate deserves being looked into but I don’t think the noise you’re hearing is the gate opening.
Are you stock or running tunes? Sorry, signatures don’t show up on mobile devices.
Also the ebpv has been unplugged so it should be wide open...
It's a Van Gogh
Joined: Feb 2010
Posts: 7,812
Likes: 1,335
From: Elk Grove, CA
I don’t see any soot on the firewall and when it starts cold I don’t see any smoke escaping from anywhere except the tail pipe so I ‘think’ I’m good to go in that regard.
To pressurize the system I just put a 3” pipe cap with a schrader valve in where the air filter attaches and pressurize it to about 15psi correct? I noticed RiffRaff has all the boots for around $150 I might just replace them to be safe..
Thanks for the reply and help
To pressurize the system I just put a 3” pipe cap with a schrader valve in where the air filter attaches and pressurize it to about 15psi correct? I noticed RiffRaff has all the boots for around $150 I might just replace them to be safe..
Thanks for the reply and help
Thread Starter
|
Tuned
Joined: Oct 2020
Posts: 467
Likes: 158
Thanks for the link and the pics!
I forgot to add that I unplugged the red tube on the waste gate and it made no difference at all if that gives any clues as to what’s going on.
I pulled the hot side intercooler tube and looked very close at the boots. No wear that I can see. Working on the cold side now. My pipe cap and schrader valve should be here in a few days so that will help.
I forgot to add that I unplugged the red tube on the waste gate and it made no difference at all if that gives any clues as to what’s going on.
I pulled the hot side intercooler tube and looked very close at the boots. No wear that I can see. Working on the cold side now. My pipe cap and schrader valve should be here in a few days so that will help.
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Lead Driver
Joined: Jul 2017
Posts: 6,855
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From: WV
I prefer to not pressurize the CCV when doing the boost leak check. If you get too much pressure there’s a potential of damaging a seal. But this thought is probably vastly overstated. The air should come out around the dipstick before that point I hope...
When I do a check I put the cap directly on the turbo using a separate boot.
When I do a check I put the cap directly on the turbo using a separate boot.
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FTE Leadership Emeritus
Joined: May 2014
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From: Lake Hartwell, GA
As Jason said, cap directly on the turbo inlet is the preferred and most effective method. I just did this a couple of weeks ago after installing a new T4 turbo and having to crack open all of the boots and seals in the CAC system. If you use a valve even with a regulated air flow source it is easier to fine tune the air flow into the system.
Keep us updated!
Keep us updated!
Postmaster
Joined: Nov 2015
Posts: 4,807
Likes: 125
From: Colorado Springs
Thanks for the link and the pics!
I forgot to add that I unplugged the red tube on the waste gate and it made no difference at all if that gives any clues as to what’s going on.
I pulled the hot side intercooler tube and looked very close at the boots. No wear that I can see. Working on the cold side now. My pipe cap and schrader valve should be here in a few days so that will help.
I forgot to add that I unplugged the red tube on the waste gate and it made no difference at all if that gives any clues as to what’s going on.
I pulled the hot side intercooler tube and looked very close at the boots. No wear that I can see. Working on the cold side now. My pipe cap and schrader valve should be here in a few days so that will help.
Thread Starter
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Tuned
Joined: Oct 2020
Posts: 467
Likes: 158
I pulled and checked all the boots except for the ones that go into the plenums. Everything looks great. Still planning to pressure test everything but I’m worried I won’t find much.
What else could it be? I’ve had a few people tell me the turbo is probably toast... I sure hope not the wife will kill me haha.
thanks for the reply’s so far I really appreciate the help!
What else could it be? I’ve had a few people tell me the turbo is probably toast... I sure hope not the wife will kill me haha.
thanks for the reply’s so far I really appreciate the help!
Cargo Master
Joined: Jan 2009
Posts: 2,800
Likes: 31
From: OKC, OK
I pulled and checked all the boots except for the ones that go into the plenums. Everything looks great. Still planning to pressure test everything but I’m worried I won’t find much.
What else could it be? I’ve had a few people tell me the turbo is probably toast... I sure hope not the wife will kill me haha.
thanks for the reply’s so far I really appreciate the help!
What else could it be? I’ve had a few people tell me the turbo is probably toast... I sure hope not the wife will kill me haha.
thanks for the reply’s so far I really appreciate the help!
FTE Chapter Leader
Joined: May 2020
Posts: 2,933
Likes: 2,192
From: Langley B.C. Canada
6lbs of boost unloaded at 2000 rpm cruising is ok.
Id expect to see more than that at 4K load with your foot into it, and your EGT is through the roof IMO.
Im pulling 8500lbs, 30lbs boost, and hard pressed to see 1200°. Tunes, and a wheel on my truck though.
If there are no drive pressure leaks then there is something major wrong on the boost side for sure.
Check the turbo as above... look at the hot side CAC tube where it goes over the power steering pump. The fitting has been known to wear a hole in the pipe there.
I would have done the boost leak check prior to pulling pipes out, but at least this way you get to clean everything up and make sure you have a good seal at the boots.
I found 5 different leaks on my truck and was still making 16ish.
Id expect to see more than that at 4K load with your foot into it, and your EGT is through the roof IMO.
Im pulling 8500lbs, 30lbs boost, and hard pressed to see 1200°. Tunes, and a wheel on my truck though.
If there are no drive pressure leaks then there is something major wrong on the boost side for sure.
Check the turbo as above... look at the hot side CAC tube where it goes over the power steering pump. The fitting has been known to wear a hole in the pipe there.
I would have done the boost leak check prior to pulling pipes out, but at least this way you get to clean everything up and make sure you have a good seal at the boots.
I found 5 different leaks on my truck and was still making 16ish.
Thread Starter
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Tuned
Joined: Oct 2020
Posts: 467
Likes: 158
Thanks again everyone you’ve all been very helpful. So I have this sinking feeling that my plenums are to blame for my leak(s). I won’t know for sure until I can pressurize everything hopefully tomorrow so in the meantime I’m just stressing myself out over hopefully nothing haha.
I’m really dreading the thought of having to do them if needed I’m ok with a wrench but it looks to be quite a bit more work than I’m comfortable with...
That said the truck does have 237k and I highly doubt they’ve ever been off. My question is what do I need to do to be able to run the billet plenums RiffRaff sells? I tried calling just now to ask but they’re closed. Anyone have first hand experience with billet plenums on a E99?
Imagine I’ll go with an ebpv delete pedestal while I’m in there.. anything else to consider doing IF it comes down to leaking plenums? I’m relatively new to 7.3’s so I’ll take any advice I can get.
Andrew
I’m really dreading the thought of having to do them if needed I’m ok with a wrench but it looks to be quite a bit more work than I’m comfortable with...
That said the truck does have 237k and I highly doubt they’ve ever been off. My question is what do I need to do to be able to run the billet plenums RiffRaff sells? I tried calling just now to ask but they’re closed. Anyone have first hand experience with billet plenums on a E99?
Imagine I’ll go with an ebpv delete pedestal while I’m in there.. anything else to consider doing IF it comes down to leaking plenums? I’m relatively new to 7.3’s so I’ll take any advice I can get.
Andrew
Lead Driver
Joined: Jul 2017
Posts: 6,855
Likes: 2,332
From: WV
While you’re in there…
A cheap set of SS bellowed uppipes. Even if the stock ones aren’t leaking they will be eventually.
A RRD billet turbo wheel. Spools quicker and prevents surge, but I think the surge is more of an issue L99 and up.
Turbo rebuild is like $60.
See how this list grows…