Ok i finally got my car running (sierra cosworth L6 ecu stage 1) but it has a horrible hesitation problem under load, it idles perfectly and if i slowly rev its great but if you blip the throttle or floor it it just goes mental, i have changed the following items

Crank sensor
Phase sensor
Dizzy cap & rotor arm
New spark plugs
Timing is ok
all gaps are good

Its driving me insane could anybody help with suggestions! Thanks!

 

Coil? FPR?

 

hi mate i will try another coil as i dont know much about the one i fitted also i fitted an adjustable fpr set to 3 bar. cheers

 

Best o' luck. Keep us posted

 

thanks mate i need it lol

 

How did you set the fuel pressure reg?
Was the 3 bar set with the vacuum on or off?
Is it definately a rising rate type regulator?
Check voltage at fuel pump as well

 

hi mate the regulator is just an ebay cheapy jod 3 bar was set with the vacuum off cheers

 

just a quick update the spark plugs are thick with black soot (DRY) it also pops and bangs when revvved hard. cheers

 

Cheapy fuel pressure regulator

 

so i take it you think a genuine reg will sort my problem out?

 

??? mad mat

 

Check your alternator output voltage is good and consistent... Fuel pump and loom/conections. How is your ECU loon conections and harness

 

if its not been run for a while it may need a bit of a setup

 

I have no idea if it will sort it. My point is fuel pressure is critical on these Turbo motors and you have a cheap n cheerful regulator fitted. Cheap is fine as long as it works bang on.

I thought fuel pressure should be 3.5bar with vac hose disconnected? Dropping to roughly 3bar at idle with hose connected.

Can someone else confirm please before this chap melts a piston.

 

Hi mate sorry thats what i meant i set it to 3.5 bar with vac off and it drops to 3 bar with vac connected, my alternator is brand new 65 amp would that cause such erratic behaviour? fuel pump is brand new 044, connections all seem fine mate, i may change the regulator for a standard one if i can find one.. thanks for the replies.

 

I'm sure Alternator should be 90amp on a Cossie. Mine is and so are a couple of mates ones that I've replaced alternators on.

 

hi mate yes ive checked and apparently there is a 70 and a 90 amp. but do you really think this would make a massive difference? cheers.

 

70 amp is for non heated screen models 90 amp is for heated screen models

You can use either on the non heated screen models

 

Check your MAP sensor, i had the same problem.
Luckily I have a monitor so I saw right away that my MAP pressure
shouldn't be 1 bar with engine turned off.

 

thanks for the replies guys, i am deffinatley going to try the map sensor as its popped up a lot in conversations with others. i dont have a heated screen mate so hopefully it should be ok. cheers again

 

SORTED!