Not an OBS, but I need your guys help on a SD
#1
Not an OBS, but I need your guys help on a SD
Hey guys,
I know I should be posting in the SD section but I feel you may be able to help on this, and this group has helped me more than I can say thanks to on the past. I am at my wits end on a 2002 SD. I have tested every darn thing I can on it. The problem I'm having is it simply won't build boost like it should. It's a darn turd at higher rpm. I have recorded 20 or so logs on it after every step with AE and everything checks out besides the manifold gauge pressure. It's throwing a low boost code, and I can not for the life of me figure out the culprit. My last resort is pulling the turbo and rebuilding it, but it has absolutely no shaft play side to side or in and out, compressor wheel is not perfect but pretty darn good. Here is a list of everything replaced with OE parts, some as basic maintainance, some to solve the issue.
New AD injectors
New GP and relay
New fuel pump
New ICP
New Ipr
New UVCH
New VCG
Frx kit
New air Filter
New fuel filter
Pulled the tank and sending unit, very little debris in the screens, cleaned and reinstalled
New gaskets all around
Plugged red line to waste gate
Wired waste gate shut
I have pressure tested the chit out of it, fuel at idle, fuel under wot and load, tested each plenum individually, tested IC and pipes, tested entire intake post turbo, tested from airbox to turbo outlet. It it could be be pressure tested it was done fuel or air.
I can post AE results but they did not vary much, it will hit 2900+ under 40% DC, new icp and ipr did not change much. Key on engine off results are all in check, FPW is in check. EBPV is not stuck shut, tube is not plugged. eOT never goes over 210, tranny shifts just fine. Blowby is nill for a truck with 260k on it. It's one of the cleanest motors outside and on the top end I have ever seen. He takes excellent care of it. Runs Amsoil at 5k OCI, runs ps and Lukas in the fuel.
I do not know what else to do, turbo back pressure is in the mid 30s at gauge when it barely hit 10 psi charge at gauge. That's the catch, besides a bad turbo what else could it be, turbo seems fine though??? No fluid leaks anywhere.
Tomorrow I'm going to pull the CPS and put a new one in, don't think it will do squat but I'll try it.
I have run a log almost everytime after a change was made, very little change. I am stumped.
Truck is an 02 f350 with an auto and 263 on the clock. No cel besides the low boost code. This is the third time I have had it. I would have a hard time asking to pull the turbo with no certainty it's the problem.
What do you guys think? Sorry this was typed on my phone at 1am opening my first frustration beer...,
I know I should be posting in the SD section but I feel you may be able to help on this, and this group has helped me more than I can say thanks to on the past. I am at my wits end on a 2002 SD. I have tested every darn thing I can on it. The problem I'm having is it simply won't build boost like it should. It's a darn turd at higher rpm. I have recorded 20 or so logs on it after every step with AE and everything checks out besides the manifold gauge pressure. It's throwing a low boost code, and I can not for the life of me figure out the culprit. My last resort is pulling the turbo and rebuilding it, but it has absolutely no shaft play side to side or in and out, compressor wheel is not perfect but pretty darn good. Here is a list of everything replaced with OE parts, some as basic maintainance, some to solve the issue.
New AD injectors
New GP and relay
New fuel pump
New ICP
New Ipr
New UVCH
New VCG
Frx kit
New air Filter
New fuel filter
Pulled the tank and sending unit, very little debris in the screens, cleaned and reinstalled
New gaskets all around
Plugged red line to waste gate
Wired waste gate shut
I have pressure tested the chit out of it, fuel at idle, fuel under wot and load, tested each plenum individually, tested IC and pipes, tested entire intake post turbo, tested from airbox to turbo outlet. It it could be be pressure tested it was done fuel or air.
I can post AE results but they did not vary much, it will hit 2900+ under 40% DC, new icp and ipr did not change much. Key on engine off results are all in check, FPW is in check. EBPV is not stuck shut, tube is not plugged. eOT never goes over 210, tranny shifts just fine. Blowby is nill for a truck with 260k on it. It's one of the cleanest motors outside and on the top end I have ever seen. He takes excellent care of it. Runs Amsoil at 5k OCI, runs ps and Lukas in the fuel.
I do not know what else to do, turbo back pressure is in the mid 30s at gauge when it barely hit 10 psi charge at gauge. That's the catch, besides a bad turbo what else could it be, turbo seems fine though??? No fluid leaks anywhere.
Tomorrow I'm going to pull the CPS and put a new one in, don't think it will do squat but I'll try it.
I have run a log almost everytime after a change was made, very little change. I am stumped.
Truck is an 02 f350 with an auto and 263 on the clock. No cel besides the low boost code. This is the third time I have had it. I would have a hard time asking to pull the turbo with no certainty it's the problem.
What do you guys think? Sorry this was typed on my phone at 1am opening my first frustration beer...,
#5
#7
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#8
Agreed. I can post up the logs but the BARO sensor and MAP sensor are sending the correct voltages for the atmospheric pressure with the key on engine off. The MAP increases to a bout 10 psi, where it never venture past, and neither does the turbo.
#9
Just another little update. I did not know this was the stock turbo with 263,xxx miles on it. That shocked me, as I do not see them last this long. No shaft play whatsoever on it either.
He will be bringing it back in a month to pull the turbo and rebuild it. New billet wheel, 360 thrust, and deleted pedestal will go on it as well. While I have it off the plenums are being resealed no matter what.
I am going to toss a New CPS in it and would like to get a spare map that is known good to swap. I really do not think its the MAP guys, when they go bad their voltage output is all across the board and they usually are off an atmosphere or more when compared to the BARO sensor. That is what I have seen, but there is likely something you have all seen that I am missing. Once again, thank you for your help.
He will be bringing it back in a month to pull the turbo and rebuild it. New billet wheel, 360 thrust, and deleted pedestal will go on it as well. While I have it off the plenums are being resealed no matter what.
I am going to toss a New CPS in it and would like to get a spare map that is known good to swap. I really do not think its the MAP guys, when they go bad their voltage output is all across the board and they usually are off an atmosphere or more when compared to the BARO sensor. That is what I have seen, but there is likely something you have all seen that I am missing. Once again, thank you for your help.
#11
I wanted to follow up on this and say the issue is resolved. This past weekend i was able to get the truck back. Pulled and rebuilt the turbo, deleted pedestal, Wired waste gate shut, and put in a billet wheel. Well I had it out I went ahead and rebuilt his bowl for him and resealed the plenums.
Plenums received a set of new boots, inserts, and tbolt clamps.
New CPS, EBPS, and MAP
Unfortunately due to the limited time and dry time on the RTV I did not get a chance to run it and log between each install for each component. So needless to say, I can't say exactly what it was, but I'm 99.9% sure that the turbo was the issue at 260k miles on a stock unit. Compressor wheel, oil seals, and turbine all looked excellent for a 100k unit let along 2.5 times that.
Bone stock truck hits 22psi unloaded here in CO... its actually the best I have seen to date, most are in the 18-19 range.
Plenums received a set of new boots, inserts, and tbolt clamps.
New CPS, EBPS, and MAP
Unfortunately due to the limited time and dry time on the RTV I did not get a chance to run it and log between each install for each component. So needless to say, I can't say exactly what it was, but I'm 99.9% sure that the turbo was the issue at 260k miles on a stock unit. Compressor wheel, oil seals, and turbine all looked excellent for a 100k unit let along 2.5 times that.
Bone stock truck hits 22psi unloaded here in CO... its actually the best I have seen to date, most are in the 18-19 range.
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