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I would start with a relative compression test to verify the engine is worth putting money into. A test you can easily do without any diagnostic equipment is to warm the engine up all the way with the oil fill cap off and watch for excessive blow by and pressure coming out of the fill tube. Also listen for popping out the intake and exhaust
this is one of the first things I did when I picked the truck up. I didn’t notice any blow by. I figured I would do another test today just in case. I let the truck run until they got up to temperature for about 15 minutes and then took the oil cap off and didn’t notice anything after five minutes.
Thanks for bearing with us on getting FORScan vs believing the Innova.
Several things to check next:
1. What are MAP, Baro, and EBP (in psig) at KOEO?
2. Consider removing the EBP sensor and running a thick weed whacker string through the tube to ensure that the tube is clear.
3. Remove the MAP sensor hose and inspect (no holes/cracks and no plugging).
4. Verify that the intake nipple that the MAP hose attaches to is not plugged.
5. Make sure that the CAC boots don't show any signs of leaking (soot/oil).
6. Sometimes the Intercooler (actually a Charge-Air-Cooler) will develop a leak. We can get back to this later.
Sometimes the turbo VANES will stick. The full version of FORScan can command the VGT actuator.
thank you for the detailed list. I’m going to do these tests tomorrow, but I did find one boot that is in really poor shape.
I will update you tomorrow with my investigation. Thanks again.
That picture of your CAC boot definitely shows that it has been leaking. That needs to be addressed (at least tighten clamps, maybe even new clamps and new boot).
Also, fuel pressure is a critical parameter - especially if the fuel tank might have a lot of debris in it. Low fuel pressure can cause harm to expensive injectors. 45 psig minimum at ALL times.
Thanks for bearing with us on getting FORScan vs believing the Innova.
Several things to check next:
1. What are MAP, Baro, and EBP (in psig) at KOEO?
2. Consider removing the EBP sensor and running a thick weed whacker string through the tube to ensure that the tube is clear.
3. Remove the MAP sensor hose and inspect (no holes/cracks and no plugging).
4. Verify that the intake nipple that the MAP hose attaches to is not plugged.
5. Make sure that the CAC boots don't show any signs of leaking (soot/oil).
6. Sometimes the Intercooler (actually a Charge-Air-Cooler) will develop a leak. We can get back to this later.
Sometimes the turbo VANES will stick. The full version of FORScan can command the VGT actuator.
when I tried to run the KOEO test I received the code P1000 and could not figure out how to get the psi readings.
i went on to run the key on engine running test where I found codes.
P0299 - turbo underboost
cause: exhaust pressure sensor A circuit
VGTcontrol valve$1 (not sure what this means)
P1408 - EGR flow out of self test range
causes
plugged or stuck edge valve or edge vacuum regulator
egr reatricted
plugged or open edge vacuum regulator or dove hose
shorted DPFEGR sensor
damaged EGar vacuum regulator solenoid
damaged DPFEGR sensor
damaged PCM
Then I would pull the EGR valve and makes sure it is clean and can be moved fairly freely. Then make sure it is in the closed position and then re-install it. Then I would leave it disconnected and take a drive to see if the boot and a closed EGR valve helped you noticeably. Clear the codes before the test drive. See what comes back.
Any catalytic converter can plug, but I wouldn't say that the 6.0L was actually prone to doing so.
If I were to straight pipe the truck would this cause any additional issues for me?
Someone said that the catalytic converters are prone to clogging on these trucks and may be causing some of my issues....
Thanks to everyone who is still following this thread!
You can remove the cat without issue as long as you don't have to get emissions testing/inspection.
I wouldn't remove the muffler, 6.0 sounds like a$$ without a muffler.
In my experience you'd never make 2000 rpm with a fully clogged cat.
Also, I've never heard of a cat failing on a diesel. Usually it's gas engines and excessive unburnt gasoline that melts them.
Maybe I haven't heard of it because most of mine have been removed, but I had plenty of customers with cats intact.
I hope someone is still following this thread. I had to take a break due to life events and weather.
This evening I replaced the intercooler boots with riff raff boots.
I uncovered a few new issues.
1. After replacing the boots and reving the engine, it sounds like the truck is sputtering when the turbo is winding down. IDK if this is the turbo or intercooler or maybe the air filter?
2. I did an engine on test and I have a few new codes.
P1408 EGR flow out of range
P2263 Turbo / supercharger boost performance
P0299 Turbo / supercharger under boost.
I hope to spend more time investigating this issue tomorrow.
If anyone has any ideas about the new symptoms it would be appreciated. I know I have more testing to do which was mentioned above.
I do not intend on letting this thread die until I have a well documented solution.
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