Hey guys,

 

My truck has suddenly felt like it has lost a crazy amount of power. It is not as noticeable until the torque converter locks in overdrive and the truck feels like a turd. Also, when the truck is warm and idling in park it has an intermittent miss/popping sound,which goes away when put into gear. This sound has occurred for about 2 years now, so I haven't thought much of it. Would you guys think this would be the injectors finally wearing out or the VP getting ready to die? I have no codes. Shift points have also gotten noticeably longer, as it will ride 3rd gear forever now. I have pressure tested my Airdog 150 and everything comes out as spec since it is the 15 PSI model. I also have a boost gauge and at WOT I can still hit 30 PSI of boost but I still have nowhere near as much power as about a week ago, Which is why I think it could be fuel related.

Edited January 22, 20178 yr by nwilliams

How many miles on injectors?

I am really unsure. If the previous owner never replaced them, then they have 178,000 on them, but I do not know if they have ever been replaced. The VP44 looks to be replaced, but once again I am unsure of the mileage.

Do you have a live data tool to check sensor values while driving?

 

 

I don't. I still have to trace my wires for my IOD fuse, because as of now I don't even have an OBDII port.

How are you monitoring boost? Mods on/in truck?

Thought I made a signature, but I must not have. My truck is a 1998.5 extended cab 4x4 auto with a mechanically stock motor. I do have an Edge Comp and and AirDog 150 along with a cold air intake and 4" exhaust. Transmission is pretty fresh with some upgraded internals. I am monitoring boost from a boost gauge probed to one of the "boost bolt adapters" in the intake manifold. I am getting 30PSI max boost in overdrive, so I am assuming that is what the wastegate has been turned to along with an aftermarket boost elbow. The turbo/chip setup was on the truck when I purchased it, so I do not know for sure.

So you're saying max boost hasn't changed at all since this started?

On 1/22/2017 at 10:44 AM, nwilliams said:

Airdog 150 and everything comes out as spec since it is the 15 PSI model.

 

Is this tested under load? I would like to know what your WOT pressure is.

Correct, max boost has not changed. I have not tested this WOT.

It seems that this issue is not nearly as noticeable when the truck is cold in the mornings. When I drive it a few miles and everything gets warm, then it has a noticeable loss of power. I am starting to wonder if my new alternator has not just caused different symptoms from what I was having?

Unhook the field lead and go for a test drive see the issues go away.