Engine/Transmission (1994 - 1998) Losing boost???

[MBurke]

On my 97 12v, I have noticed that all of the sudden, I can only get about 10-12 lbs. of boost on the westac guage. I always got 20-25 before... ... Can a turbo start losing boost? Or do I more likely have a pinhole in the rubber tubing somewhere. Truck seems fine.

 

[illflem]

Check the hose from the injection pump to the turbo wastegate. Also check that the wastegate isn't stuck open. And of course check that your air intake tubes are on all the way and the clamps tight.

 

[gitchesum]

I had the same problem a few weeks ago. Turns out it was the boost gauge hose. It was cracked right at the engine fiting. Works fine now.

Are you noticing less power and more smoke than usual?



I'd check all those things BIll mentioned as well, just to be on the safe side.

 

[Alaskaskiff]

Another possibility is the wastegate actuator. The bellows let go in my truck and cost me about 5-6 pounds of boost. They aren't cheap, so try other fixes first.

 

[radixr]

Pinhole won't do it.

You need a lot more leakage than a pinhole to lose that much boost. I had two major leaks and didn't lose than much. :{ :{

 

[illflem]

radixr, a pin hole in the boost gauge line will show a lower reading even though the boost hasn't changed. Think that's what gitchesum was refering to.

 

[Dennis Garrett]

Mine split at the barb fitting on the back of the gauge, fixed that, still weak, did the lever adjustment, and it shot up to 35 lbs. The lever was hanging up on the nose of the #8 plate.

 

[MBurke]

lever adjustment

Lever adustment???

 

[Dennis Garrett]

Lever adjustment

http://www.piersdiesel.com/LeverAdj.htm