H.RST

hi iv got EFI RS Turbo, It holding back under load as soon as the turbo kicks. changed the coil,leads,spark plugs and turbo still the same, seems to be fueling?

wedge07

hi mate, i put a fiesta rs turbo engine in my escort, runs bob on but as soon as i hit 0 psi it judders, backfires and wont go??? put cossie pump on, put all samcos on n still no difference??? sounds like we have same problem?????

crossy2004

i have same prob but with mfi just as boost kicks in

Rogeyboy

iTrader: (2)

I had same problem once i efi turbo'd my orion... It was running chronically lean! Check your idle fuel pressure and the CO reading of the car!

wedge07

i have a air/fuel ratio gauge installed and that is spot on, i dont think mine is to do with fueling?
could it be actuator

vroooom ptssssh

What Air temp sensor do you's have fitted, as there are two types (xr/rs) and the XR one doesn't work and causes symptoms like this....found it a couple of times with two cars we've had in. (you want the smaller black two pin square plug type)

wedge07

hi mate, ill sound thick now but where is air temp??
when i put fiesta rst engine in, i used the full fiesta loom???

vroooom ptssssh

see the cream coloured plug going onto the black sensor? should look like this.

wedge07

yeah i have that cream plug in what else could it be?

Rogeyboy

iTrader: (2)

Map sensor playing up? You got the right map sensor, the OFAC fiesta 1 differs from the XR2i one, but looks the same!

H.RST

i was thinking MAP sensor because it seems to be as soon as the boost hits +1 psi? when i fitted by map sensor i fitted it on the side i think it needs to point upwards!! ill try it tomorrow?

H.RST

yer sounds like the same thing does your idle ok.

xr2wishy

iTrader: (2)

as said, MAP sensor i'd have thought, N/A ones only read vacuum, turbo ones read boost and vacuum.

Adamkelly

My Fiesta did that exact same thing last year,
tuck me ages to find it.

Turned out to be the speed sensor coming of the speedo cable at the box.
The plug were i joins the main loom was dodgy.
fixed connection and was perfect then

Dono if EFi Escorts have the same set up, but worth a try

wedge07

It idles fine, but when its warm it idles high n low if u get me?
Up n down, up n down etc.
The map sensor i got is out of the fiesta rst i got loom engine gearbox ecu etc? What you mean map sensor has to point upward???? Is this true as i have mine flat on its back?

H.RST

Yer mine idles fine till its hot then hunts. i think when the map sensors is in its original place it points up towards the bonnet upwards you no? could be that gona try at the weekend, have you got that speed sensor on your that's a good idea as well! let us no how you get on ill do the same.

Rogeyboy

iTrader: (2)

As for the hunting at idle, clean the IACV out with carb cleaner and whilst your there do the inlet aswell... The MAP sensor should mount with the multiplug and the vac pipe pointing downwards...

HirenRS

harry mate call me on 907927177888 i think i can help ya out i got mine finished and back on the road now i had exaclty the smae problems as you

wedge07

I will let u know mate, gonna try a few bits n bobs, its something really simple but cant find it y would it matter how map sensor sits? Does urs feel like it boosts better if u rev it whilest parked up?

Rogeyboy

iTrader: (2)

HirenRS - what was the cure you found?

wedge07

Sorted mine out now mines ready for tuning now. H rst is yours a fiesta rst conversion? If so is it ofab or ofac. Let us know coz bet urs is the same problem???

H.RST

tell us what you done wedge!!!!

HirenRS

the cure was discovered when...i converted xr2i to rs turbo bought a engine ecu map sensopr and edis4 was supplied with the ecu, fitted all together fully re-built bottom end forged up new crank etc etc...turned it on idled fine started to drive all on ofac turbo gear and it did exactly what hrst did got a guy in called auto tune somehow he thought injector 4 wasnt firing put it back on xr2i ecu it works fine....then discovered the map sensor was xr2i not turbo changed that all 4 cylinders work fine....the cure in the end was just driving the car belive it or not after all the map sensor changed etc drove a bit better jerked as soon as i try go anywhere with it, the ofab and ofac ecus require adjustment period this is where they self learn as long as all earths and loom is okay it will self learn properly beleive it or not i have dobne this twice on ofab and ofac did the same thing just taught the ecu how toi drive, it will jerk at 1 psi then 2 then 3 slowly getting better eventually depending on how it set up 10 psi like both mine did takes about 10 miles id say to run perect after this a quick test on the gas analyser prooved it running absolutely spot on

HirenRS

if anything harry i got a ofacv loom, ecu, map sensor and edis 4 and a coilpack that all work lets try it in your motor sometime this week and also hows your mixture had it on a crypton yet ? tkae it down to a mot station my localk does me a full print out for a tenner

HirenRS

by the way speed sneosr makes no difference i kow this because mines fkt and disconnected, no cables attached or cable to speedo...mine seems to drive pretty good lol

H.RST

that would be sweet if i could try your ecu at lest i no if it was our not.

davidfox280585

my efi series 1 seems to be holding back and juddering like mad when i accelerate though its been off the road a few year and i have just fitted the engine,
spec is 1.8zvh efi ofab cossie pressure reg 3 bar map sensor,msd chip on beiges,walbro 255 intank pump

could it be it wants the fuelling and fuel pressure set?,also what plugs should i be running as he plugs in it are temps i fitted to get it up and running