Car lagging. (not fuelcut)

[Dsm kidd]

Okauy so this doesnt happen all the time but when it does happen it goes like this. When it happends my car pretty much lags of power. In WOT my turbo spools all the way up and the RPMs barley rise. thats what happends even when i down shift! Any thoughts?

 

[constant_proj21]

Have you ever done a boost leak test on the car?

 

[Dsm kidd]

No not yet, im planning to really soon. do you think that is it? I already no theres a boost leak forsure.

 

[1983gsp]

Try a different supplier of fuel. Sounds like you are getting knock and the ecu is pulling timing. One way to check is add two gallons of xylene or toulene to a half tank of fuel and add 2oz of marvel mystery oil and see if the problem goes away. Not recommended for daily use, just to diagnose the problem.

It will NOT harm the engine or fuel system. The MMO offsets the drying characteristics of the xyelene or toulene on the fuel lines and orings, and lubricates the top end. Toulene is one of the ingredients in octane booster.

http://www.google.com/m/url?client=...UQFjAJ&usg=AFQjCNELQsYGVs-He6EIeWExO054Mw549Q

If the problem goes away, find a better gas station.

 

[Rogi]

It sounds like boost leak to me too. I usually just use soap and water in all the piping conections and rev up the engine, if you see bubbles, whala there is your leak not the best method but it workd

 

[RedGST98]

Aye.. sounds like a boost leak somewhere.. check all your couplers.. and throttle body.. everywhere you can when you do a leak test...