I believe this is related to my low power and P0237 issues but last evening I went and picked up a new boat 20 miles away. Idk when it started but i started hearing a lot of what sounds like valve chatter. Something tells me it has nothing to do with the valves but that it’s related to a timing issue. I’m also having rough idle symptoms again although a bit different from when I had air in fuel. What I’m thinking is since I have turbo play and all that i may have low boost which flipped the code and is causing low power. I also read somewhere here that low boost will create more timing and make a knocking noise and higher boost will retard timing. 

 

This boat I bought is a 16foot aluminum boat. It don’t weigh much at all but o the way home going up a 5% grade the truck was very sluggish and I kept loosing speed in 6th gear going 65 up the hill. Also the turbo instead of making a whistle when I stabbed the throttle going up the hill it made more of a lower pitched whine. Any one else think my issues are related to the turbo? 

Also would a boost leak tester provide the results needed to condemn the turbo?

Can a APPS go bad without code? I’m curious if this is part of the low power issue. Just speculating while over here in the BVIs at the hotel. So far the P0237 hasn’t came back since I cleared the code. Turbo rebuild kit should be there when I get home along with a boost elbow suggested by Matt at DAP. Also I’ll be checking for boost leaks. If I do have boost leaks and the low power is from that and a sloppy turbo why the heck would that0237 code have popped up?  

 

Also so will my turbo need rebalancing when the rebuild is done?

11 hours ago, Marcus2000monster said:

Can a APPS go bad without code?

 

Not typically. Basically the P0122 or P0123 is when the APPS sensor goes out of range either hi or lo voltage. When it does the ECM normally dead pedals for protection so not to either be in WOT or so low to possibly stall the engine. The P0121 code is when the voltage of the APPS and the IVS don't agree with each other this is more common when the owner has done voltage adjustment on worn sensors. 

 

So the rare part is to have a spot in the cruising realm that the rheostat starts to wear out and the voltage dips. Still in a normal range but just voltage changed. This can be seen on a live data tool where the throttle is held steady and the TPS signal is jumping up and down possibly. Then if you change the position slightly the value now is steady and normal again showing the weak spot you've just past.