What are symptoms of a turbo boost leak?

[fkovalski]

As the title says... what would I experience if my truck had a boost leak?

 

[Mobius1]

Hissing sound High egt's, low boost, increased smoke. What do you have going on?

 

[fkovalski]

Low power, a sound similar to detonation, NO smoke, knocking and engine miss.

I think that my issue might be a boost leak.


I am trying to try and figure out what sounds like detonation as described IN THIS THREAD.

I have had dealers acknowledge the pinging sound but stating that it is normal. NO, it is not normal. I was never this way and low and behold there happened to be a used truck on the lot exactly as mine right down to the same manual transmission when 2 were offered on this year. It sounded and performed the way mine used to before these drivability issues.

I had a mechanic tell me that wrong injectors may have been installed in my truck by an aftermarket diesel injection service and injector rebuild shop. The mechanic told me that the symptoms of what I describe which include the pinging/ detonation sound, the lack of power upon accelerating (until speed builds up) and most significantly, NO smoke when accelerating! All of this he says could be to incorrect (too small) injectors being installed. He feels that there is not enough fuel being delivered which is causing the lack of power which cause a lack of turbo boost (until RPM comes up) and most importantly he states that having no smoke is not right especially at my altitude (9,300 feet. )

My truck even when new smoke pretty good at this altitude. Now it is not doing that now.

I am frustrated and p!ssed and after dishing out some $2,800 for the new injectors it is running worse than when before. The diesel service shop is telling me it is normal. Bu!!$#!t! The truck is running like crap and it is ******* me off because I know that it is not normal having owned it since new.

the diesel shop that did the injectors told me to run the truck with my camper on at 3,000 RPM while hauling the load to really heat up the engine to burn off any carbon that might be causing detonation. I am beginning to think it is not detonation because the "working" of the engine as described has made no difference. Adding a cetane additive makes no difference. Hence all my questions about the fuel delivery system questions.

The tech who suspects that too small injectors are the culprit says that this check valve external to the common rail can make noise if there is a programmer on an engine with stock size injectors. he thinks that perhaps I have normal pressure (I have no programmers or chips) but the normal pressure on too small injectors could cause this rattling sound along with all the performance symptoms I describe.

 

[JJPage]

If you had a boost leak you would be smoking, the bigger the leak the more smoke produced.

Can you hear your in-tank lift pump running while cycling your ignition key to the on position? If it is weak or failing the CP3 injection pump may be fighting to pull fuel through the lift pump until higher rpms are obtained. Another area to check would be the proper torque on your cross tubes, since injectors were replaced the cross tubes had to be removed, then re-installed and re-torqued(42ft lbs on used tubes). if the torque is not correct, too much fuel will be by-passing the injector(s), which could also cause your issues.

The rail pressure relief valve could be operated too, once they operate they become weak and will leak fuel, again allowing fuel to by-pass the injectors. Either one of these conditions cannot be seen as a fuel leak externally, they will follow an internal path around the injectors and back to the tank or fuel filter housing, you will never know it is happening without proper TS techniques.

If somehow they installed the wrong injectors... like for an 03/04, that could also be the case... if so you are spraying fuel onto the crown of your pistons, not a good thing.

I would get the truck to an authorized CR repair shop.