Skotie jay

if i wanted to adjust the fuel on my efi do i need to do it at the ecu???

cheers guys

chaffe

What do you mean by adjust the fuel mate? the map or the fuel pressure? for what reason do you wish to do this? i would think seriously before you adjust anything or you could destroy your engine

Skotie jay

its majorly over fueling at the mo. an i wanted to turn it down just a bit as im about to start running it in. i was just wondering if it possible to adjust with out linking to computer. if its safer to get it mapped i will do that just i know once run it ill need to map it anyways. im just testing the water as ive just converted to efi from mfi. i was pretty good with geting it right with the mfi but i dont know much bout the efi system yet

chaffe

You need to use a wideband lambda gauge to check its not going to be too lean on boost, but you can turn the fuel pressure down under the bonnet to lean the whole map off, but be warned this can melt pistons and burn valves out if you are not chacking the AFR with a sensor.

Skotie jay

yh im not using boost its on 6psi as i dont want to glase the fordged pistons i just want to stop it pumping out fuel on tick over as its bastard chocking me lol

chaffe

can you not adjust the idle mixture pot? what is it like when you hold it at 2000 rpm? still rich?

Skotie jay

wel tbh as ive only just started to sort it theres a few issuse as the rev counts totally out of sort at the mo sits at bout 500rpm but it ticking over at round 1500rpm i can tell by the sound. and tbh i dont know how to solve this issue either lol. tbh ive had the engine in for a few months but got that pissed off i just parked it an left it as it was. but now the tax is up on the saph i may aswell use it whilst the tax is left on it lol. an as for messing with the mixture pot i aint tryed that. will puting the bailey breather system on help??? an also its got a normal cheap clear fuel filter as i had to rush putting it togther because i was moving house. do u think that would make a difference???

chaffe

filter should make no odds, nor will the breather, your rev counter is easily fixed (assuming you went from distributer to EDIS wasted spark) its a simple wire change mod, you will prob have to bend the stop on the butterfly throttle to bring the idle speed down if its out of the range of the ICV.

chaffe

The vac pipe is plugged into the FPR isnt it? just a thought lol

QplateRST!

This may sound silly but have u checked for any air leaks ? If the vac pipe to the map sensor is split or off then it will massively over fuel and not idle properly just a thought !

Versus_Creations

iTrader: (1)

What wiring loom, ecu and sensors have you used. I.e are they all matched and from the same system. OFAC or OFAB.

Who installed the wiring loom and is it correct, does it use a FRST loom?

The EFi system hides many issues as it will run with almost all the sensors unpluged, so if you have done an EFi conversion and has a wiring issue or the wiring is not correct you have no real way of checking if all is right with diagnostics or hardware.

These days finding decent working CO pot's are hard too, most of them will not adjust and needs to be changed. So worth checking the wiring to the ECU from all the sensors and pin check each one.

chaffe

As above, check everything, you can replace a faulty co pot with a potentiometer from the likes of Maplin, i had a spare one from a previous electronics project and used it in an ofab system with no probs. But certainly check all vac pipes first, and put a meter accross the coolant temp sensor and inlet air temp sensor to make sure they have a rsistance of around 2k ohm, open circuit means they are def toast.

Skotie jay

are now i see where the problem is coming from as its still got the standard breather system. i think u might of solved the problem as i didnt blank of the filter on the frst breather system, gona do it now if it works ill be happy man . we stole the ecu out the fezza an we got a diagram of how to link it together off rs-manics or summat. but tbh i think the air leak will solve this issue. now just need to check clean an sort the water pump thanks for the in put guys im sure ill be back to ask summat else. soon lol

Skotie jay

ok heres where im at we took the engine loom ecu out of the donor frst an put these into the erst. im going to replace all the sensors as a few have been playing up. im not sure wheather is ofac or ofab is ther away i can find out??? the wiring all seems to work corectly as all the lights an stuf work fine. i blanked off the open bit of breather an it cleared a bit as some suggested a air leak. but its still burning oil bad i know they burn oil anyway but as its a totally rebuilt engine would it be wise to get it set up so it aint burning so much oil an fuel. i sound dumb by that question but im would like a proper opinion not just me guess lol tbh i aint got a clue what a co pot is lmao which is prossible thick but its seem to be a hell of a lot differnet to the mfi system.

vaughant

iTrader: (1)

Hi fella,I only found out about the mixture pot t'other day when trying to get an efi escort cab thru the Mot.not sure if u know what it is but on the inner wing of the car there's a little rubber cover and iirc 3 wires going into what looks like a flathead screw made of plastic,mark up where it is first.then turn it fully clockwise one whole turn,see what,if anything happens,and then of course the same the other way.

If it's mixing that rich then I'd suggest looking at the whole system first,checking sensors etc either via haynes or autodata(pm me your address if u want a copy) and looking for airleaks and so on.even taking a look on an Mot computer will give you an idea of how bad the emmissions are,not sure if the frst ever came with a cat but I don't think it did.if it did though,check for lambda sensor wires and if there was one connected as that will totally fuck your running up.good luck fella.incidently,did you make sure you soldered and heat shrinked any connections you made from loom to loom?bad connections will also throw your fault finding out miles,bad earth etc.

Skotie jay

yh all the connection were soldered and wraped. id dont think they had a cat at the one the engine came from had a straight through ss exhaust. an i dont know if there is even a mixture pot lol will have to look tomoz for that. now to cover the efi im going to need a frst haynes manual am i not :S i do need to find the time to go over all conection correctly as a couple of the clips snapped tbh we just threw it in only taking time on the loom. as we knew that would be important.
thanks vayghant an every one else for the advice an ill update how i get on when i get chance to get summat done to it

vaughant

iTrader: (1)

No probs fella,I'm happy to send you the autodata cd as it gives good advice on what voltages/resistances you should expect at various components,it's very handy?