Car takes forever to pick up.

[DanGST]

I rebuilt the transmission last month and when I'm driving it, it takes forever to pick up. I need a idle air control motor, a speed sensor and my old smic was damage so I am using a audi a4 smic. But the upper pipe had to go so I use spectre piping for now from pep boys. What can be causing slow pick up. Can it be a boost leak or the car in limp mode?

 

[CHINA1G]

Is it a auto or manual?

 

[DanGST]

Auto

 

[Boostinsideways]

What kinda boost are you seeing? How long is taking the turbo spool up? You might have some pre-turbo exhaust leaks.

 

[DanGST]

The only type of boost I see is 11 to 12 psi. No matter what I do. I have an aem tru boost.
Edit: the car been sitting all winter

 

[Boostinsideways]

So your saying even trying to turn up the boost with your Truboost your not getting past 12 psi? I would say its definently preturbo exhaust leaks, or your waste gate is blowing open/leaking. The housing is prove to cracking around the flappers.

 

[DanGST]

so a major boost leak will cause a slow pick up.

 

[Bud92gsx]

For sure it will..I would definatly check...

 

[DanGST]

How can i check if its the wastegate?

 

[miguelmcv]

Put some pressure to the wastegate line and check for movement.

 

[Boostinsideways]

so a major boost leak will cause a slow pick up.

The way the turbo works, exhaust gases are passed from engine through the turbo and out the tail pipe, witchcraft happens, and you go faster.

If your Exhaust manifold to head gasket, or Turbo to exhaust manifold gasket is leaking, you will have a path for exhaust gases to escape without flowing through the turbo. It would cause slow spool, and make it feel like it takes forever to pickup. Especially without changing gear. My car in 5th takes 2-3s to hit 10 psi, and another 1-3s to hit full spool from 55 in 5th gear.

If you have pre turbo exhaust leaks it takes longer to spool, and effectivly limits how much boost you will make.

If you have boost leaks (after turbo) your car will hiccup/stutter/jerk because the ecu is metering air before it comes in your turbo, and is expecting more air.

 

[DanGST]

will a boost leak test, test for pre turbo exhaust leak or is there another way to check.

 

[Boostinsideways]

Look for black marks that show exhaust gases escaping around the manifold and o2 housing.Usually the easiest way to find exhaust leaks is to listen to them.

Kinda hard to describe a sound, maybe look on youtube for a video of an exhaust leak?