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Power Problim

DriftAddict

By DriftAddict,
in Engines & Forced Induction

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DriftAddict Explorer

DriftAddict

Posted
Posted

Hey guys

Been looking through the forums and haven't found anything similar to what iam having problems with, so here it is.

on start up and the car is idling it drops down a bit in revs and then picks back up

When traveling you put your foot down abit the turbo spools up and boost comes on up the car does not go anywhere, now when you you do this is sounds like the car is not getting enough air / fuel.

and almost sounds like a spark pulg is not firing correctly.

i have given the air filter a clean, check to see if afm is firmly plugged in

This problem dissapears once the engine has heated up abit..runs fine !

Can anyone help

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GTSBoy Grand Master

GTSBoy

Posted
Posted

When the engine is cold the ECU holds ignition timing constant at 15 degrees. It feels quite sluggish. When the water temp reaches a threshold then the ECU releases the lock on timing and it frees up.

So that might explain why it feels wrong when it's cold.

If you are talking about the revs not sitting stable at a cold or warm idle then maybe you need to take your idle air valve off and give it a clean out with carby cleaner. They get sticky and unable to smoothly control the idle revs. Usually you don't see this problem at a truly cold idle because there is a thermostatic valve that is open when the coolant is cold that allows even more air in to give an even faster cold idle speed. If you are having this problem at cold idle, check to see if the water heated valve has been disconnected (or even removed! - some people are idiots).

cheers

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