Hi
I have taken my 2wd sierra cosworth stage 1 to stage 3 by changing the yellow injectors to dark green, adding a 3 bar map sensor and stage 3 chip. I have taken the car out and it was running quite lump at first but got it warm and it was a little better. AS SOON as I tried to hit the boost, it coughs and splutters and no boost. Is this common? does it need setting?? or have i just done something wrong?
Any ideas and info would be appreciated.
CHeers Goy

 

MAP sensor might be duff. Did it have a problem before you changed the parts?

 

its a new map sensor which i got off ebay. its not a genuine one its a new one but a 'copy' version. i have got it to use with the greens.
car was ok with the yellows and my old map sensor

 

Just cos it's new doesn't mean it's good And if it's not a proper Weber/Marelli one it might have left the Chinese factory broken.

Have you got someone nearby that can lend you a 3 bar MAP to prove it?

 

Plugs?? had to close the gap slightly on mine as it was blowing the spark out.

 

A non genuine map sensor, from the land of dubious quality/ebay.
I assume you are trying to kill your engine ?, get a genuine known quality item such as bosch, or the 3 bar weber/mareli, whether this is the fault or not you don't want to be using it.
When you have got the 3 bar genuine article on there fit the bits but take it easy until you have been to a rolling road for a full load fuelling check, money well spent as it could save you a meltdown of the engine.
Before you do this though ensure you have rewired the fuel pump, and fans.
tabetha

 

will be doing this to mine very soon, going straight to get set up before i do anything to be safe

 

As said about the MAP sensor, but whose chip do you have, I hope this wasen't a Ebay job unless from a reputable seller?

I assume you haven't checked the CO and the fuel pressure and made adjustments if neccessary, (Fuel pressure is usually standard)?

Also as said check the plug gaps.

Martin

 

could be a duff chip as well,but get a proper map sensor matey

 

make sure you've install the MAP sensor properly as one the mounting holes has an earthing sleeve on it.

again as said genuine MAP and check plug gaps