high egt low boost problem
- Thread starter rjustman
- Start date
crackerman
New member
Well, take turbine housing apart, see if pucks are sealing on the ports, if not, find out why. Make modifications as necessary
I know this sounds dumb but how will I know if it’s leaking? Will there be marks? Do I fill it with liquid and see if it leaks? I plan to put air to it to see when it starts moving also. Another thing I’m wondering. Could it possibly be wrong injectors? I put brand new S&S injectors in about 2 years ago. I e only driven MAYBE 3000 miles on them. But I’ve been righting egt problems ever since. Is it remotely possible with a company like S&S that maybe I got late mode 5.9 injectors instead of the 03-04 bowl? I know I’d have to pull one and try to count holes. But has that every happen to anyone that you’ve heard of? They were dropped shipped directly from S&S. Ordered through hardway from a local dealer.
SPEEDSHIFT
New member
If they are the wrong bowl pattern it will haze at idle and smoke cruising down the highway.
I would pull the charger off and take a look at the turbine wheel. With 4.30 gears and stock sized tires, what kind of RPM are you running at 70mph?
khaoskustoms
New member
Can you confirm from S&S what injector spray pattern you have? I had a truck that had the late 5.9 injectors with the early piston bowls. Similar symptom where egt's were always higher then I thought they should have been. Went to the proper pray pattern injector and the truck was completely different. Throttle response was better, egt's came down and boost went up.
Red Sleeper
Active member
Funny thing that’s commonly overlooked is the thermocouple reading your EGT temp. I checked the temp of my exhaust manifold two days ago on my 12v with a Fluke temp gun after pulling a gross weight of 32k. Temp gun showed 425* at the probe location, EGT gauge showed 300*.
Might do a simple check to rule out the thermocouple or gauge.
Might do a simple check to rule out the thermocouple or gauge.
I’ll try that. I just recently changed the thermocouple because it was sticking at 450-500 for a bit. Changed it and problem went away but still reading same egts as last one was.
20 psi. If I dig into it from zero to as fast as she’ll go. On an on-ramp, flat ground , it don’t matter.20 psi it MIGHT float to 22-23 but comes back to 20 right away. And when torque converter locks in OD it drops to about 15-18 tops
Gotta be a turbo problem. I just went over the whole system with a boost detector and had a shop do the same. Both yielded zero leaks. Well I had one and it’s now fixed but was very VERY small. Either way gasket was replaced on the intake plenum and now zero leaks that I’ve seen since.. I bought the turbo directly from Weston, put a different turbine housing on it to fit a t3 instead of the t4 I got from him and bolted it in. Just because Weston is a bad ass I’m guessing problem lies in the turbine housing. But I can’t figure it out! I’ve wired the gate shut and still no change in boost OR egts..
Something happened after the ex housing change. Look to see if the wheel has made contact. Either way turbo needs to be pulled and looked over.
That’s gonna be the next item on the list. I am installing an exhaust brake so when I take elbow off back I’m gonna pull the turbo and take a peak. Bad part is I contacted AGP about the turbine housing. They won’t fix anything, just sell me more parts. Sucks but it is what it is I guess
Y’all are awesome I appreciate all the input. It’s been a long time trying to figure it out. I just assumed since everything was brand new it should just work. But that hasn’t been the case.