I have an early 99 F-350. The EGT's are running higher than they used to with no modifications being done to the truck. I checked to make sure my boot connections are tight but haven't had time to do a pressure test yet. I'm going to verify the EBPV isn't stuck in a slightly closed position (hopefully tonight). If the leak test turns out good and the EBPV is not stuck closed, I was thinking about purchasing a cat delete pipe for testing to see if the cat is causing a restriction. Does anyone have a suggested place to buy a cat delete pipe? Do the experts out there think I'm on the right track? Any additional suggestions would be appreciated.
High EGT's
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192 Posts
My early 99 had higher than normal EGTs from a pre-turbo exhaust leak. After fixing the leaks and adding a 6.0 intercooler it still runs hotter than some of the guys with the later trucks, but it is much better.
I'd check for up-pipe leaks before blaming the cat.
I'd check for up-pipe leaks before blaming the cat.
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I'd check for up-pipe leaks before blaming the cat.
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I forgot to mention, I inspected the exhaust manifolds and up pipes. I can't find any soot around these connections. Based on this, if there is a pre turbo leak, I'm guessing it must be minor. Would a minor leak, that doesn't produce soot, cause a noticeable increase in EGT's
I'd check for up-pipe leaks before blaming the cat.
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I forgot to mention, I inspected the exhaust manifolds and up pipes. I can't find any soot around these connections. Based on this, if there is a pre turbo leak, I'm guessing it must be minor. Would a minor leak, that doesn't produce soot, cause a noticeable increase in EGT's
Update:
1. Pressure tested the Turbo, intercooler, pipe, boot connections at 18 psi while spraying soapy water on all joints and listening for leaks. No leaks detected.
2. Tried to verify EBPV is not stuck closed by disconnecting the rod from the butterfly shaft to see if it rotates freely but it’s hard to get my hand under the turbo and can’t see what I’m doing. I read there is a clip I could pull off to accomplish this but can’t feel it. (if anyone has any pointers on how to accomplish this I would sure like to here it) I ended up disconnecting the EBPV electrically. I was able to rotate the EBPV shaft towards the passengers side a little and the spring returned it back to where it started so I don’t think it’s stuck closed.
3. I monitored EBP with autoenginuity last night. I read in this forum that it should be 28 psi after 30 seconds of WOT. My reading was about 34 psi after 30 seconds of WOT. I saw it spike as high as 40 psi. It was 11 to 12 psi at idle.
Based on this info, I’m thinking the cat might be slightly clogged and restricting flow making my egt’s higher than they used to be. If anyone out there has any thoughts or ideas, I would sure like to hear from them.
1. Pressure tested the Turbo, intercooler, pipe, boot connections at 18 psi while spraying soapy water on all joints and listening for leaks. No leaks detected.
2. Tried to verify EBPV is not stuck closed by disconnecting the rod from the butterfly shaft to see if it rotates freely but it’s hard to get my hand under the turbo and can’t see what I’m doing. I read there is a clip I could pull off to accomplish this but can’t feel it. (if anyone has any pointers on how to accomplish this I would sure like to here it) I ended up disconnecting the EBPV electrically. I was able to rotate the EBPV shaft towards the passengers side a little and the spring returned it back to where it started so I don’t think it’s stuck closed.
3. I monitored EBP with autoenginuity last night. I read in this forum that it should be 28 psi after 30 seconds of WOT. My reading was about 34 psi after 30 seconds of WOT. I saw it spike as high as 40 psi. It was 11 to 12 psi at idle.
Based on this info, I’m thinking the cat might be slightly clogged and restricting flow making my egt’s higher than they used to be. If anyone out there has any thoughts or ideas, I would sure like to hear from them.
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466 Posts
to test the cat, i would just unbolt it off the system and drive it around for a while with no cat. yes it would be loud coming straight off the dp but it would tell u if that was the problem. and the injectors in you sig i have no idea, but are ADs bigger than the stockers? (injector experts will chime in)
hope this helps
kevin
hope this helps
kevin
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the injectors in you sig i have no idea, but are ADs bigger than the stockers?
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The AD's are the same as the stockers the truck came with. I just had them rebuilt about a year ago. EGT's didn't start going up untill about 3 months ago.
the injectors in you sig i have no idea, but are ADs bigger than the stockers?
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The AD's are the same as the stockers the truck came with. I just had them rebuilt about a year ago. EGT's didn't start going up untill about 3 months ago.
FWIW, when I check the EBP to set the back pressure for the exhaust brake, I get 11 - 12 psi at idle with the exhaust brake engaged (valve closed). With the brake "off", the pressure shows 0. It sounds to me like you have a restriction of some kind in the exhaust.
jgr
jgr
I believe the 99's came with AB injectors. I don't know when the switch to AD's was. There was a post here in the last week or so and they mentioned the AB's flowed 120 something compared to AD's 140 something. Does Swamp recommend tuning with the larger injectors?
Have you checked the HPOP pressure? Jody told me low pressure could contribute to high tempertures. Seems counterintuitive to me but I will go with his expertise.
Mine seems to have high temps and I am trying to work one thing after another to get things right. I just got my Dieselsite pressure checker and tonight I found one leaking boot going into the intake manifold. When I get that fixed that should help some.
Have you checked the HPOP pressure? Jody told me low pressure could contribute to high tempertures. Seems counterintuitive to me but I will go with his expertise.
Mine seems to have high temps and I am trying to work one thing after another to get things right. I just got my Dieselsite pressure checker and tonight I found one leaking boot going into the intake manifold. When I get that fixed that should help some.
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I believe the 99's came with AB injectors. I don't know when the switch to AD's was. There was a post here in the last week or so and they mentioned the AB's flowed 120 something compared to AD's 140 something. Does Swamp recommend tuning with the larger injectors?
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Swamps did not recoment tuning with these rebuilds. These rebuilds are not supposed to flow any more than they did prior to rebuild. I ran the truck with these injectors for about 8 months before my egt's started climbing. I don't see how this could be injector related
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Have you checked the HPOP pressure? Jody told me low pressure could contribute to high tempertures. Seems counterintuitive to me but I will go with his expertise.
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I have not checked the HPOP oil pressure since the problem developed. I didn't know that low HPOP could cause high EGT's. Hopefully I can check that tonight.
I believe the 99's came with AB injectors. I don't know when the switch to AD's was. There was a post here in the last week or so and they mentioned the AB's flowed 120 something compared to AD's 140 something. Does Swamp recommend tuning with the larger injectors?
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Swamps did not recoment tuning with these rebuilds. These rebuilds are not supposed to flow any more than they did prior to rebuild. I ran the truck with these injectors for about 8 months before my egt's started climbing. I don't see how this could be injector related
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Have you checked the HPOP pressure? Jody told me low pressure could contribute to high tempertures. Seems counterintuitive to me but I will go with his expertise.
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I have not checked the HPOP oil pressure since the problem developed. I didn't know that low HPOP could cause high EGT's. Hopefully I can check that tonight.
I agree that it probably isn't the larger injectors if they worked for 8 months. I am considering going to a larger injector someday and the AD's maybe a good choice for me. Im still learning here.
On my HPOP under full acceration it would go as low as 1400. You may need someone to watch the computer while you drive. I only saw about 1900 but I was trying to drive and watching for cops, three gauges, a speedo and the computer at the same time.
The early 99's also have a HPOP that flows less that the later versions so they don't keep up as well. Also mine has DP tuneing that causes more temp along with more power. But mine had temp problems even before. I added a larger exhaust and that dropped the temperatures some.
What kind of boost pressure can you get? I assume you still have the stock turbocharger.
On my HPOP under full acceration it would go as low as 1400. You may need someone to watch the computer while you drive. I only saw about 1900 but I was trying to drive and watching for cops, three gauges, a speedo and the computer at the same time.
The early 99's also have a HPOP that flows less that the later versions so they don't keep up as well. Also mine has DP tuneing that causes more temp along with more power. But mine had temp problems even before. I added a larger exhaust and that dropped the temperatures some.
What kind of boost pressure can you get? I assume you still have the stock turbocharger.
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What kind of boost pressure can you get? I assume you still have the stock turbocharger.
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I haven't seen my boost go above 15 psi lately. I think I used to get closer to 17. I do still have the stock turbo on this truck.
I haven't had a chance to check my hpop pressure yet.
I just got back from a muffler shop where they tested my cat out to see if it was clogged. they said there was no problem with it.
What kind of boost pressure can you get? I assume you still have the stock turbocharger.
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I haven't seen my boost go above 15 psi lately. I think I used to get closer to 17. I do still have the stock turbo on this truck.
I haven't had a chance to check my hpop pressure yet.
I just got back from a muffler shop where they tested my cat out to see if it was clogged. they said there was no problem with it.
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You know another thing could be the gauge. I don't know how we could check it though. Maybe somebody else here has figured that one out.
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This did cross my mind but the truck seems to be lacking a little in performance as well (lower boost than before). I decided to try and verify the gauge anyways with an IR temp gun. The readings with the gun were about 75 degrees lower than the gauge but I was measuring at the outside of the exhaust manifold and the probe is actually in the exhaust path. Not sure this is the best way to do it with acurate results.
I have ordered the Walker BTM from Black Cloud Diesel. From what I have read, this should help my EGT's but I still think there is something else going on.
You know another thing could be the gauge. I don't know how we could check it though. Maybe somebody else here has figured that one out.
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This did cross my mind but the truck seems to be lacking a little in performance as well (lower boost than before). I decided to try and verify the gauge anyways with an IR temp gun. The readings with the gun were about 75 degrees lower than the gauge but I was measuring at the outside of the exhaust manifold and the probe is actually in the exhaust path. Not sure this is the best way to do it with acurate results.
I have ordered the Walker BTM from Black Cloud Diesel. From what I have read, this should help my EGT's but I still think there is something else going on.
Joined
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247 Posts
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You know another thing could be the gauge. I don't know how we could check it though. Maybe somebody else here has figured that one out.
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I checked mine with an Infrared non-contact thermometer from Sears. My guage is reading about 50degF lower than the IR pointed at the same location on the manifold at idle. I havent figure out how to strap someone to the left frame rail underneath the cab in order to check it under load. Assuming that the error is linear, that's close to 15%, which at 1200degF would be 1380 actual.
Also, I have an Autometer guage, which I have come to realize is junk. I have 5 Autometer across two vehicles, and I believe they are all just the cheapest crap available. Next time I am getting a different brand.
You know another thing could be the gauge. I don't know how we could check it though. Maybe somebody else here has figured that one out.
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I checked mine with an Infrared non-contact thermometer from Sears. My guage is reading about 50degF lower than the IR pointed at the same location on the manifold at idle. I havent figure out how to strap someone to the left frame rail underneath the cab in order to check it under load. Assuming that the error is linear, that's close to 15%, which at 1200degF would be 1380 actual.
Also, I have an Autometer guage, which I have come to realize is junk. I have 5 Autometer across two vehicles, and I believe they are all just the cheapest crap available. Next time I am getting a different brand.
Update:
I received my Walker Big Truck Muffler today. I cut the old exhaust out but left the cat in place. For the heck of it I decided to start it up to see what it sounded like. I couldn't tell the difference between when the muffler was on and when it wasn't. I had my wife come out and she didn't think it was any noisier than before either. I then took it for a drive and the EGT’s are about 200 degrees lower than they were with the stock muffler. I was also able to get 17 psi of boost. I haven’t seen over 15 in a while. It didn’t seem any louder on the road either. Can anyone tell me if it is illegal to run without a muffler? If its not illegal, I may just run a pipe rather than add the walker BTM.
I received my Walker Big Truck Muffler today. I cut the old exhaust out but left the cat in place. For the heck of it I decided to start it up to see what it sounded like. I couldn't tell the difference between when the muffler was on and when it wasn't. I had my wife come out and she didn't think it was any noisier than before either. I then took it for a drive and the EGT’s are about 200 degrees lower than they were with the stock muffler. I was also able to get 17 psi of boost. I haven’t seen over 15 in a while. It didn’t seem any louder on the road either. Can anyone tell me if it is illegal to run without a muffler? If its not illegal, I may just run a pipe rather than add the walker BTM.
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981 Posts
I asked the same question a while back about running without a muffler. Here's the post and the answers I recieved.
http://forums.thedieselstop.com/ubbthrea...rue#Post3227890
http://forums.thedieselstop.com/ubbthrea...rue#Post3227890
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I asked the same question a while back about running without a muffler. Here's the post and the answers I recieved.
http://forums.thedieselstop.com/ubbthrea...rue#Post3227890
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Thanks losfinch! I appreciate the link to all the info! I'm going to clamp on the Walker BTM tomorrow and get some comparison EGT readings. If they are the same, I'll leave it on. If they're higher, I'll think about going straight.
I asked the same question a while back about running without a muffler. Here's the post and the answers I recieved.
http://forums.thedieselstop.com/ubbthrea...rue#Post3227890
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Thanks losfinch! I appreciate the link to all the info! I'm going to clamp on the Walker BTM tomorrow and get some comparison EGT readings. If they are the same, I'll leave it on. If they're higher, I'll think about going straight.
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