Wastegate question

[Alaskaskiff]

Wondering if it is possible for wastegate to stick in open position? I am pretty sure mine hung up closed about a year ago. Was getting almost 28 lbs of boost, normally 23-4. Right now I am getting 20 (suspiciously near the opening pressure). Timing was recently done at Autowerks Diesel and had full boost (23-4) after that for a few months. Engine is 96/215 no mods... Don't really know what it looks like inside to know if sticking is possible. Linkage has never been adjusted.



thanks

 

[Missouri Mule]

Yes, your waste gate rod/linkage could get stuck in the open/closed or halfway? position. Similar to how the rod on the fuel shut of solenoid occasionally gets stuck. Cause I believe is dirt on rod(for fuel shut off solenoid) this also could apply to waste gate linkage.



You mite also want to check out all hose connections from turbo to intake manifold. Check out pre cooler also. Check out turbo.

Check the hose/line (boost/pressure) that goes to the wastegate solenoid.

Check line that goes to your gauge and gauge itself.



Can you tell any difference on engine performance from a year ago?

 

[illflem]

Andy, they sometimes get carbon built up on them and can get stuck open or closed. Just working it back and forth by hand is usually enough to free it up.

 

[Alaskaskiff]

Waste Gate

Yes, have checked all connections from turbo to intake. No leaks. Have noticed an incremental decrease in performance, but not obvious unless towing. Checked low fuel side last night... 18 lbs @ idle, was 23 on install of new pump (now 25 wass 30 at 2000 rpm). Probably was looking at wrong side of system for problem. Will start with fuel filter & screen under fuel heater and go from there.



Thanx

 

[Alaskaskiff]

Overflow valve

Got it! Put new filter on today for moderately low pressure as above. Didn't help. Pulled out overflow valve and measured spring... . 450 in. Thought someone mentioned lengthening to . 550 on another post. Did that and got 30+ at idle, shortened to about . 480 and got 23 lbs @ idle. Boost came back too!!! Guess it wasn't the wastegate. Overflow valve is only 14k miles/8 months new... Oh well.

 

[Missouri Mule]

Nice going! It feels great when you find the problem and are able to fix it yourself.





BTW when checking fuel pressure if it is low you can reach between injector pump and fuel filter an sqeeze rubber line (with fingers or pliers).

If pressure rises than return fuel valve is the problem. If pressure stays same then the transfer pump is problem(I think one would have to take pressure test at fuel heater to count out cloggged pre-filter and tank filter) .

Save you from hit and miss.