hi guys i have a sappphire 4x4 cosworth which i seem to have a few problems with. it has a stage 1 pts chip but it was on the rolling road last week and only produced 230bhp and was also underfuelling. any ideas greatly appreciated people.

 

did they not sort out prob on rolling road

 

it was onloy a rolling road day so they were under no obligation to check. also was not sure what chip was in it at the time.

 

ok fair enough

 

Contact PTS for chip information and setup accordingly . Make sure your fuelpump is recieving good voltage supply under load not just an idle reading if its low then the pump might not be supplying enough fuel which is very bad for the engine .

 

ive contacted pts about the chip. how do i check the voltage

 

i got 11.5v at the fuel pump. im gonna service it in the week as well.

 

voltage to low mate run a new feed to the boot and use original pump feed to trigger relay, you want about 13.4v if you can mate change fuel filter too and timing,

 

This mate.

 

how do we do that then peeps.

 

run a 20/30amp live supply straight from battery make sure its fused batt end, take same size cable for a neg too, find fuel pump wires in boot, the pump 12v is red / black iirc, take the neg from batt straight to pump, get a 30amp relay run new feed to relay, earth relay to chassis, live from relay to pump and use the original pump live to turn relay on, relay has diagram on it so quite easy

 

http://www.ebay.co.uk/itm/Ford-Sierr...item3f08f08c1d

takes a couple hours to fit

 

yup im sure it meant to be 14 v on the cossies. anyway as what already been said. does the car seem laggy/ also dont even bother flooring it youl kill the engine it just starve.. sort that fuel pump out while your at it though why not put in a uprated one!

 

did you check it under load?

 

as much as i could car started and revved a bit. this is the fuel pump i have
http://shop.motorsport-developments....ump.-249-p.jpg

 

Ideally you want to see 13V+ (So alternator power) but so long as it does not drop below 12V which is all the pump needs anyway, it has to be checked UNDER LOAD.

The fuel pump wiring builds resistance over time, this is where the problem stems from, to OP if the car is new to you, you also need to make sure the cooling fans have been rewired, else you end up in a dangerous/non fan working situation, these are two chronic weak points on these cars!

Martin

 

I think i am gonna fit one of those new cables just to be 100%, might as well while the loom is out.

Let us know if it solves your problem please mate!

 

How much was your fuel pump please mate??

 

not sure if tthe fans have been rewired but they work.

 

its already on the car mate.

 

They won't do for long if on OE wiring, in fact it's actually a suprise if they do work!

Martin